From 506aa635be78cff9fb8761c7c989d0e13d9a9b91 Mon Sep 17 00:00:00 2001 From: tomo Date: Thu, 9 Sep 1999 06:08:42 +0000 Subject: [PATCH] New file. --- src/text-coding.c | 5888 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 5888 insertions(+) create mode 100644 src/text-coding.c diff --git a/src/text-coding.c b/src/text-coding.c new file mode 100644 index 0000000..f1dd835 --- /dev/null +++ b/src/text-coding.c @@ -0,0 +1,5888 @@ +/* Code conversion functions. + Copyright (C) 1991, 1995 Free Software Foundation, Inc. + Copyright (C) 1995 Sun Microsystems, Inc. + +This file is part of XEmacs. + +XEmacs is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by the +Free Software Foundation; either version 2, or (at your option) any +later version. + +XEmacs is distributed in the hope that it will be useful, but WITHOUT +ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License +along with XEmacs; see the file COPYING. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + +/* Synched up with: Mule 2.3. Not in FSF. */ + +/* Rewritten by Ben Wing . */ + +#include +#include "lisp.h" + +#include "buffer.h" +#include "elhash.h" +#include "insdel.h" +#include "lstream.h" +#ifdef MULE +#include "mule-ccl.h" +#include "chartab.h" +#endif +#include "file-coding.h" + +Lisp_Object Qbuffer_file_coding_system, Qcoding_system_error; + +Lisp_Object Vkeyboard_coding_system; +Lisp_Object Vterminal_coding_system; +Lisp_Object Vcoding_system_for_read; +Lisp_Object Vcoding_system_for_write; +Lisp_Object Vfile_name_coding_system; + +/* Table of symbols identifying each coding category. */ +Lisp_Object coding_category_symbol[CODING_CATEGORY_LAST + 1]; + +/* Coding system currently associated with each coding category. */ +Lisp_Object coding_category_system[CODING_CATEGORY_LAST + 1]; + +/* Table of all coding categories in decreasing order of priority. + This describes a permutation of the possible coding categories. */ +int coding_category_by_priority[CODING_CATEGORY_LAST + 1]; + +Lisp_Object Qcoding_system_p; + +Lisp_Object Qraw_text, Qno_conversion, Qccl, Qiso2022; +/* Qinternal in general.c */ + +Lisp_Object Qmnemonic, Qeol_type; +Lisp_Object Qcr, Qcrlf, Qlf; +Lisp_Object Qeol_cr, Qeol_crlf, Qeol_lf; +Lisp_Object Qpost_read_conversion; +Lisp_Object Qpre_write_conversion; + +#ifdef MULE +Lisp_Object Qucs4, Qutf8; +Lisp_Object Qbig5, Qshift_jis; +Lisp_Object Qcharset_g0, Qcharset_g1, Qcharset_g2, Qcharset_g3; +Lisp_Object Qforce_g0_on_output, Qforce_g1_on_output; +Lisp_Object Qforce_g2_on_output, Qforce_g3_on_output; +Lisp_Object Qno_iso6429; +Lisp_Object Qinput_charset_conversion, Qoutput_charset_conversion; +Lisp_Object Qctext, Qescape_quoted; +Lisp_Object Qshort, Qno_ascii_eol, Qno_ascii_cntl, Qseven, Qlock_shift; +#endif +Lisp_Object Qencode, Qdecode; + +Lisp_Object Vcoding_system_hash_table; + +int enable_multibyte_characters; + +#ifdef MULE +/* Additional information used by the ISO2022 decoder and detector. */ +struct iso2022_decoder +{ + /* CHARSET holds the character sets currently assigned to the G0 + through G3 variables. It is initialized from the array + INITIAL_CHARSET in CODESYS. */ + Lisp_Object charset[4]; + + /* Which registers are currently invoked into the left (GL) and + right (GR) halves of the 8-bit encoding space? */ + int register_left, register_right; + + /* ISO_ESC holds a value indicating part of an escape sequence + that has already been seen. */ + enum iso_esc_flag esc; + + /* This records the bytes we've seen so far in an escape sequence, + in case the sequence is invalid (we spit out the bytes unchanged). */ + unsigned char esc_bytes[8]; + + /* Index for next byte to store in ISO escape sequence. */ + int esc_bytes_index; + +#ifdef ENABLE_COMPOSITE_CHARS + /* Stuff seen so far when composing a string. */ + unsigned_char_dynarr *composite_chars; +#endif + + /* If we saw an invalid designation sequence for a particular + register, we flag it here and switch to ASCII. The next time we + see a valid designation for this register, we turn off the flag + and do the designation normally, but pretend the sequence was + invalid. The effect of all this is that (most of the time) the + escape sequences for both the switch to the unknown charset, and + the switch back to the known charset, get inserted literally into + the buffer and saved out as such. The hope is that we can + preserve the escape sequences so that the resulting written out + file makes sense. If we don't do any of this, the designation + to the invalid charset will be preserved but that switch back + to the known charset will probably get eaten because it was + the same charset that was already present in the register. */ + unsigned char invalid_designated[4]; + + /* We try to do similar things as above for direction-switching + sequences. If we encountered a direction switch while an + invalid designation was present, or an invalid designation + just after a direction switch (i.e. no valid designation + encountered yet), we insert the direction-switch escape + sequence literally into the output stream, and later on + insert the corresponding direction-restoring escape sequence + literally also. */ + unsigned int switched_dir_and_no_valid_charset_yet :1; + unsigned int invalid_switch_dir :1; + + /* Tells the decoder to output the escape sequence literally + even though it was valid. Used in the games we play to + avoid lossage when we encounter invalid designations. */ + unsigned int output_literally :1; + /* We encountered a direction switch followed by an invalid + designation. We didn't output the direction switch + literally because we didn't know about the invalid designation; + but we have to do so now. */ + unsigned int output_direction_sequence :1; +}; +#endif /* MULE */ +EXFUN (Fcopy_coding_system, 2); +#ifdef MULE +struct detection_state; + +static void +text_encode_generic (Lstream *encoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n); + +static int detect_coding_sjis (struct detection_state *st, + CONST unsigned char *src, + unsigned int n); +static void decode_coding_sjis (Lstream *decoding, + CONST unsigned char *src, + unsigned_char_dynarr *dst, + unsigned int n); +static void encode_coding_sjis (Lstream *encoding, + CONST unsigned char *src, + unsigned_char_dynarr *dst, + unsigned int n); +static int detect_coding_big5 (struct detection_state *st, + CONST unsigned char *src, + unsigned int n); +static void decode_coding_big5 (Lstream *decoding, + CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n); +static void encode_coding_big5 (Lstream *encoding, + CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n); +static int detect_coding_ucs4 (struct detection_state *st, + CONST unsigned char *src, + unsigned int n); +static void decode_coding_ucs4 (Lstream *decoding, + CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n); +static void encode_coding_ucs4 (Lstream *encoding, + CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n); +static int detect_coding_utf8 (struct detection_state *st, + CONST unsigned char *src, + unsigned int n); +static void decode_coding_utf8 (Lstream *decoding, + CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n); +void char_encode_utf8 (struct encoding_stream *str, Emchar c, + unsigned_char_dynarr *dst, unsigned int *flags); +void char_finish_utf8 (struct encoding_stream *str, + unsigned_char_dynarr *dst, unsigned int *flags); + +static int postprocess_iso2022_mask (int mask); +static void reset_iso2022 (Lisp_Object coding_system, + struct iso2022_decoder *iso); +static int detect_coding_iso2022 (struct detection_state *st, + CONST unsigned char *src, + unsigned int n); +static void decode_coding_iso2022 (Lstream *decoding, + CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n); +void char_encode_iso2022 (struct encoding_stream *str, Emchar c, + unsigned_char_dynarr *dst, unsigned int *flags); +void char_finish_iso2022 (struct encoding_stream *str, + unsigned_char_dynarr *dst, unsigned int *flags); +#endif /* MULE */ +static void decode_coding_no_conversion (Lstream *decoding, + CONST unsigned char *src, + unsigned_char_dynarr *dst, + unsigned int n); +static void encode_coding_no_conversion (Lstream *encoding, + CONST unsigned char *src, + unsigned_char_dynarr *dst, + unsigned int n); +static void mule_decode (Lstream *decoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n); +static void mule_encode (Lstream *encoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n); + +typedef struct codesys_prop codesys_prop; +struct codesys_prop +{ + Lisp_Object sym; + int prop_type; +}; + +typedef struct +{ + Dynarr_declare (codesys_prop); +} codesys_prop_dynarr; + +codesys_prop_dynarr *the_codesys_prop_dynarr; + +enum codesys_prop_enum +{ + CODESYS_PROP_ALL_OK, + CODESYS_PROP_ISO2022, + CODESYS_PROP_CCL +}; + + +/************************************************************************/ +/* Coding system functions */ +/************************************************************************/ + +static Lisp_Object mark_coding_system (Lisp_Object, void (*) (Lisp_Object)); +static void print_coding_system (Lisp_Object, Lisp_Object, int); +static void finalize_coding_system (void *header, int for_disksave); + +#ifdef MULE +static const struct lrecord_description ccs_description_1[] = { + { XD_LISP_OBJECT, offsetof(charset_conversion_spec, from_charset), 2 }, + { XD_END } +}; + +static const struct struct_description ccs_description = { + sizeof(charset_conversion_spec), + ccs_description_1 +}; + +static const struct lrecord_description ccsd_description_1[] = { + XD_DYNARR_DESC(charset_conversion_spec_dynarr, &ccs_description), + { XD_END } +}; + +static const struct struct_description ccsd_description = { + sizeof(charset_conversion_spec_dynarr), + ccsd_description_1 +}; +#endif + +static const struct lrecord_description coding_system_description[] = { + { XD_LISP_OBJECT, offsetof(struct Lisp_Coding_System, name), 2 }, + { XD_LISP_OBJECT, offsetof(struct Lisp_Coding_System, mnemonic), 3 }, + { XD_LISP_OBJECT, offsetof(struct Lisp_Coding_System, eol_lf), 3 }, +#ifdef MULE + { XD_LISP_OBJECT, offsetof(struct Lisp_Coding_System, iso2022.initial_charset), 4 }, + { XD_STRUCT_PTR, offsetof(struct Lisp_Coding_System, iso2022.input_conv), 1, &ccsd_description }, + { XD_STRUCT_PTR, offsetof(struct Lisp_Coding_System, iso2022.output_conv), 1, &ccsd_description }, + { XD_LISP_OBJECT, offsetof(struct Lisp_Coding_System, ccl.decode), 2 }, +#endif + { XD_END } +}; + +DEFINE_LRECORD_IMPLEMENTATION ("coding-system", coding_system, + mark_coding_system, print_coding_system, + finalize_coding_system, + 0, 0, coding_system_description, + struct Lisp_Coding_System); + +static Lisp_Object +mark_coding_system (Lisp_Object obj, void (*markobj) (Lisp_Object)) +{ + Lisp_Coding_System *codesys = XCODING_SYSTEM (obj); + + markobj (CODING_SYSTEM_NAME (codesys)); + markobj (CODING_SYSTEM_DOC_STRING (codesys)); + markobj (CODING_SYSTEM_MNEMONIC (codesys)); + markobj (CODING_SYSTEM_EOL_LF (codesys)); + markobj (CODING_SYSTEM_EOL_CRLF (codesys)); + markobj (CODING_SYSTEM_EOL_CR (codesys)); + + switch (CODING_SYSTEM_TYPE (codesys)) + { +#ifdef MULE + int i; + case CODESYS_ISO2022: + for (i = 0; i < 4; i++) + markobj (CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i)); + if (codesys->iso2022.input_conv) + { + for (i = 0; i < Dynarr_length (codesys->iso2022.input_conv); i++) + { + struct charset_conversion_spec *ccs = + Dynarr_atp (codesys->iso2022.input_conv, i); + markobj (ccs->from_charset); + markobj (ccs->to_charset); + } + } + if (codesys->iso2022.output_conv) + { + for (i = 0; i < Dynarr_length (codesys->iso2022.output_conv); i++) + { + struct charset_conversion_spec *ccs = + Dynarr_atp (codesys->iso2022.output_conv, i); + markobj (ccs->from_charset); + markobj (ccs->to_charset); + } + } + break; + + case CODESYS_CCL: + markobj (CODING_SYSTEM_CCL_DECODE (codesys)); + markobj (CODING_SYSTEM_CCL_ENCODE (codesys)); + break; +#endif /* MULE */ + default: + break; + } + + markobj (CODING_SYSTEM_PRE_WRITE_CONVERSION (codesys)); + return CODING_SYSTEM_POST_READ_CONVERSION (codesys); +} + +static void +print_coding_system (Lisp_Object obj, Lisp_Object printcharfun, + int escapeflag) +{ + Lisp_Coding_System *c = XCODING_SYSTEM (obj); + if (print_readably) + error ("printing unreadable object #", + c->header.uid); + + write_c_string ("#name, printcharfun, 1); + write_c_string (">", printcharfun); +} + +static void +finalize_coding_system (void *header, int for_disksave) +{ + Lisp_Coding_System *c = (Lisp_Coding_System *) header; + /* Since coding systems never go away, this function is not + necessary. But it would be necessary if we changed things + so that coding systems could go away. */ + if (!for_disksave) /* see comment in lstream.c */ + { + switch (CODING_SYSTEM_TYPE (c)) + { +#ifdef MULE + case CODESYS_ISO2022: + if (c->iso2022.input_conv) + { + Dynarr_free (c->iso2022.input_conv); + c->iso2022.input_conv = 0; + } + if (c->iso2022.output_conv) + { + Dynarr_free (c->iso2022.output_conv); + c->iso2022.output_conv = 0; + } + break; +#endif /* MULE */ + default: + break; + } + } +} + +static enum eol_type +symbol_to_eol_type (Lisp_Object symbol) +{ + CHECK_SYMBOL (symbol); + if (NILP (symbol)) return EOL_AUTODETECT; + if (EQ (symbol, Qlf)) return EOL_LF; + if (EQ (symbol, Qcrlf)) return EOL_CRLF; + if (EQ (symbol, Qcr)) return EOL_CR; + + signal_simple_error ("Unrecognized eol type", symbol); + return EOL_AUTODETECT; /* not reached */ +} + +static Lisp_Object +eol_type_to_symbol (enum eol_type type) +{ + switch (type) + { + default: abort (); + case EOL_LF: return Qlf; + case EOL_CRLF: return Qcrlf; + case EOL_CR: return Qcr; + case EOL_AUTODETECT: return Qnil; + } +} + +static void +setup_eol_coding_systems (Lisp_Coding_System *codesys) +{ + Lisp_Object codesys_obj; + int len = string_length (XSYMBOL (CODING_SYSTEM_NAME (codesys))->name); + char *codesys_name = (char *) alloca (len + 7); + int mlen = -1; + char *codesys_mnemonic=0; + + Lisp_Object codesys_name_sym, sub_codesys_obj; + + /* kludge */ + + XSETCODING_SYSTEM (codesys_obj, codesys); + + memcpy (codesys_name, + string_data (XSYMBOL (CODING_SYSTEM_NAME (codesys))->name), len); + + if (STRINGP (CODING_SYSTEM_MNEMONIC (codesys))) + { + mlen = XSTRING_LENGTH (CODING_SYSTEM_MNEMONIC (codesys)); + codesys_mnemonic = (char *) alloca (mlen + 7); + memcpy (codesys_mnemonic, + XSTRING_DATA (CODING_SYSTEM_MNEMONIC (codesys)), mlen); + } + +#define DEFINE_SUB_CODESYS(op_sys, op_sys_abbr, Type) do { \ + strcpy (codesys_name + len, "-" op_sys); \ + if (mlen != -1) \ + strcpy (codesys_mnemonic + mlen, op_sys_abbr); \ + codesys_name_sym = intern (codesys_name); \ + sub_codesys_obj = Fcopy_coding_system (codesys_obj, codesys_name_sym); \ + XCODING_SYSTEM_EOL_TYPE (sub_codesys_obj) = Type; \ + if (mlen != -1) \ + XCODING_SYSTEM_MNEMONIC(sub_codesys_obj) = \ + build_string (codesys_mnemonic); \ + CODING_SYSTEM_##Type (codesys) = sub_codesys_obj; \ +} while (0) + + DEFINE_SUB_CODESYS("unix", "", EOL_LF); + DEFINE_SUB_CODESYS("dos", ":T", EOL_CRLF); + DEFINE_SUB_CODESYS("mac", ":t", EOL_CR); +} + +DEFUN ("coding-system-p", Fcoding_system_p, 1, 1, 0, /* +Return t if OBJECT is a coding system. +A coding system is an object that defines how text containing multiple +character sets is encoded into a stream of (typically 8-bit) bytes. +The coding system is used to decode the stream into a series of +characters (which may be from multiple charsets) when the text is read +from a file or process, and is used to encode the text back into the +same format when it is written out to a file or process. + +For example, many ISO2022-compliant coding systems (such as Compound +Text, which is used for inter-client data under the X Window System) +use escape sequences to switch between different charsets -- Japanese +Kanji, for example, is invoked with "ESC $ ( B"; ASCII is invoked +with "ESC ( B"; and Cyrillic is invoked with "ESC - L". See +`make-coding-system' for more information. + +Coding systems are normally identified using a symbol, and the +symbol is accepted in place of the actual coding system object whenever +a coding system is called for. (This is similar to how faces work.) +*/ + (object)) +{ + return CODING_SYSTEMP (object) ? Qt : Qnil; +} + +DEFUN ("find-coding-system", Ffind_coding_system, 1, 1, 0, /* +Retrieve the coding system of the given name. + +If CODING-SYSTEM-OR-NAME is a coding-system object, it is simply +returned. Otherwise, CODING-SYSTEM-OR-NAME should be a symbol. +If there is no such coding system, nil is returned. Otherwise the +associated coding system object is returned. +*/ + (coding_system_or_name)) +{ + if (CODING_SYSTEMP (coding_system_or_name)) + return coding_system_or_name; + + if (NILP (coding_system_or_name)) + coding_system_or_name = Qbinary; + else + CHECK_SYMBOL (coding_system_or_name); + + return Fgethash (coding_system_or_name, Vcoding_system_hash_table, Qnil); +} + +DEFUN ("get-coding-system", Fget_coding_system, 1, 1, 0, /* +Retrieve the coding system of the given name. +Same as `find-coding-system' except that if there is no such +coding system, an error is signaled instead of returning nil. +*/ + (name)) +{ + Lisp_Object coding_system = Ffind_coding_system (name); + + if (NILP (coding_system)) + signal_simple_error ("No such coding system", name); + return coding_system; +} + +/* We store the coding systems in hash tables with the names as the key and the + actual coding system object as the value. Occasionally we need to use them + in a list format. These routines provide us with that. */ +struct coding_system_list_closure +{ + Lisp_Object *coding_system_list; +}; + +static int +add_coding_system_to_list_mapper (Lisp_Object key, Lisp_Object value, + void *coding_system_list_closure) +{ + /* This function can GC */ + struct coding_system_list_closure *cscl = + (struct coding_system_list_closure *) coding_system_list_closure; + Lisp_Object *coding_system_list = cscl->coding_system_list; + + *coding_system_list = Fcons (XCODING_SYSTEM (value)->name, + *coding_system_list); + return 0; +} + +DEFUN ("coding-system-list", Fcoding_system_list, 0, 0, 0, /* +Return a list of the names of all defined coding systems. +*/ + ()) +{ + Lisp_Object coding_system_list = Qnil; + struct gcpro gcpro1; + struct coding_system_list_closure coding_system_list_closure; + + GCPRO1 (coding_system_list); + coding_system_list_closure.coding_system_list = &coding_system_list; + elisp_maphash (add_coding_system_to_list_mapper, Vcoding_system_hash_table, + &coding_system_list_closure); + UNGCPRO; + + return coding_system_list; +} + +DEFUN ("coding-system-name", Fcoding_system_name, 1, 1, 0, /* +Return the name of the given coding system. +*/ + (coding_system)) +{ + coding_system = Fget_coding_system (coding_system); + return XCODING_SYSTEM_NAME (coding_system); +} + +static Lisp_Coding_System * +allocate_coding_system (enum coding_system_type type, Lisp_Object name) +{ + Lisp_Coding_System *codesys = + alloc_lcrecord_type (Lisp_Coding_System, &lrecord_coding_system); + + zero_lcrecord (codesys); + CODING_SYSTEM_PRE_WRITE_CONVERSION (codesys) = Qnil; + CODING_SYSTEM_POST_READ_CONVERSION (codesys) = Qnil; + CODING_SYSTEM_EOL_TYPE (codesys) = EOL_AUTODETECT; + CODING_SYSTEM_EOL_CRLF (codesys) = Qnil; + CODING_SYSTEM_EOL_CR (codesys) = Qnil; + CODING_SYSTEM_EOL_LF (codesys) = Qnil; + CODING_SYSTEM_TYPE (codesys) = type; + CODING_SYSTEM_MNEMONIC (codesys) = Qnil; +#ifdef MULE + if (type == CODESYS_ISO2022) + { + int i; + for (i = 0; i < 4; i++) + CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i) = Qnil; + } + else if (type == CODESYS_CCL) + { + CODING_SYSTEM_CCL_DECODE (codesys) = Qnil; + CODING_SYSTEM_CCL_ENCODE (codesys) = Qnil; + } +#endif /* MULE */ + CODING_SYSTEM_NAME (codesys) = name; + + return codesys; +} + +#ifdef MULE +/* Given a list of charset conversion specs as specified in a Lisp + program, parse it into STORE_HERE. */ + +static void +parse_charset_conversion_specs (charset_conversion_spec_dynarr *store_here, + Lisp_Object spec_list) +{ + Lisp_Object rest; + + EXTERNAL_LIST_LOOP (rest, spec_list) + { + Lisp_Object car = XCAR (rest); + Lisp_Object from, to; + struct charset_conversion_spec spec; + + if (!CONSP (car) || !CONSP (XCDR (car)) || !NILP (XCDR (XCDR (car)))) + signal_simple_error ("Invalid charset conversion spec", car); + from = Fget_charset (XCAR (car)); + to = Fget_charset (XCAR (XCDR (car))); + if (XCHARSET_TYPE (from) != XCHARSET_TYPE (to)) + signal_simple_error_2 + ("Attempted conversion between different charset types", + from, to); + spec.from_charset = from; + spec.to_charset = to; + + Dynarr_add (store_here, spec); + } +} + +/* Given a dynarr LOAD_HERE of internally-stored charset conversion + specs, return the equivalent as the Lisp programmer would see it. + + If LOAD_HERE is 0, return Qnil. */ + +static Lisp_Object +unparse_charset_conversion_specs (charset_conversion_spec_dynarr *load_here) +{ + int i; + Lisp_Object result; + + if (!load_here) + return Qnil; + for (i = 0, result = Qnil; i < Dynarr_length (load_here); i++) + { + struct charset_conversion_spec *ccs = Dynarr_atp (load_here, i); + result = Fcons (list2 (ccs->from_charset, ccs->to_charset), result); + } + + return Fnreverse (result); +} + +#endif /* MULE */ + +DEFUN ("make-coding-system", Fmake_coding_system, 2, 4, 0, /* +Register symbol NAME as a coding system. + +TYPE describes the conversion method used and should be one of + +nil or 'undecided + Automatic conversion. XEmacs attempts to detect the coding system + used in the file. +'no-conversion + No conversion. Use this for binary files and such. On output, + graphic characters that are not in ASCII or Latin-1 will be + replaced by a ?. (For a no-conversion-encoded buffer, these + characters will only be present if you explicitly insert them.) +'shift-jis + Shift-JIS (a Japanese encoding commonly used in PC operating systems). +'ucs-4 + ISO 10646 UCS-4 encoding. +'utf-8 + ISO 10646 UTF-8 encoding. +'iso2022 + Any ISO2022-compliant encoding. Among other things, this includes + JIS (the Japanese encoding commonly used for e-mail), EUC (the + standard Unix encoding for Japanese and other languages), and + Compound Text (the encoding used in X11). You can specify more + specific information about the conversion with the FLAGS argument. +'big5 + Big5 (the encoding commonly used for Taiwanese). +'ccl + The conversion is performed using a user-written pseudo-code + program. CCL (Code Conversion Language) is the name of this + pseudo-code. +'internal + Write out or read in the raw contents of the memory representing + the buffer's text. This is primarily useful for debugging + purposes, and is only enabled when XEmacs has been compiled with + DEBUG_XEMACS defined (via the --debug configure option). + WARNING: Reading in a file using 'internal conversion can result + in an internal inconsistency in the memory representing a + buffer's text, which will produce unpredictable results and may + cause XEmacs to crash. Under normal circumstances you should + never use 'internal conversion. + +DOC-STRING is a string describing the coding system. + +PROPS is a property list, describing the specific nature of the +character set. Recognized properties are: + +'mnemonic + String to be displayed in the modeline when this coding system is + active. + +'eol-type + End-of-line conversion to be used. It should be one of + + nil + Automatically detect the end-of-line type (LF, CRLF, + or CR). Also generate subsidiary coding systems named + `NAME-unix', `NAME-dos', and `NAME-mac', that are + identical to this coding system but have an EOL-TYPE + value of 'lf, 'crlf, and 'cr, respectively. + 'lf + The end of a line is marked externally using ASCII LF. + Since this is also the way that XEmacs represents an + end-of-line internally, specifying this option results + in no end-of-line conversion. This is the standard + format for Unix text files. + 'crlf + The end of a line is marked externally using ASCII + CRLF. This is the standard format for MS-DOS text + files. + 'cr + The end of a line is marked externally using ASCII CR. + This is the standard format for Macintosh text files. + t + Automatically detect the end-of-line type but do not + generate subsidiary coding systems. (This value is + converted to nil when stored internally, and + `coding-system-property' will return nil.) + +'post-read-conversion + Function called after a file has been read in, to perform the + decoding. Called with two arguments, BEG and END, denoting + a region of the current buffer to be decoded. + +'pre-write-conversion + Function called before a file is written out, to perform the + encoding. Called with two arguments, BEG and END, denoting + a region of the current buffer to be encoded. + + +The following additional properties are recognized if TYPE is 'iso2022: + +'charset-g0 +'charset-g1 +'charset-g2 +'charset-g3 + The character set initially designated to the G0 - G3 registers. + The value should be one of + + -- A charset object (designate that character set) + -- nil (do not ever use this register) + -- t (no character set is initially designated to + the register, but may be later on; this automatically + sets the corresponding `force-g*-on-output' property) + +'force-g0-on-output +'force-g1-on-output +'force-g2-on-output +'force-g2-on-output + If non-nil, send an explicit designation sequence on output before + using the specified register. + +'short + If non-nil, use the short forms "ESC $ @", "ESC $ A", and + "ESC $ B" on output in place of the full designation sequences + "ESC $ ( @", "ESC $ ( A", and "ESC $ ( B". + +'no-ascii-eol + If non-nil, don't designate ASCII to G0 at each end of line on output. + Setting this to non-nil also suppresses other state-resetting that + normally happens at the end of a line. + +'no-ascii-cntl + If non-nil, don't designate ASCII to G0 before control chars on output. + +'seven + If non-nil, use 7-bit environment on output. Otherwise, use 8-bit + environment. + +'lock-shift + If non-nil, use locking-shift (SO/SI) instead of single-shift + or designation by escape sequence. + +'no-iso6429 + If non-nil, don't use ISO6429's direction specification. + +'escape-quoted + If non-nil, literal control characters that are the same as + the beginning of a recognized ISO2022 or ISO6429 escape sequence + (in particular, ESC (0x1B), SO (0x0E), SI (0x0F), SS2 (0x8E), + SS3 (0x8F), and CSI (0x9B)) are "quoted" with an escape character + so that they can be properly distinguished from an escape sequence. + (Note that doing this results in a non-portable encoding.) This + encoding flag is used for byte-compiled files. Note that ESC + is a good choice for a quoting character because there are no + escape sequences whose second byte is a character from the Control-0 + or Control-1 character sets; this is explicitly disallowed by the + ISO2022 standard. + +'input-charset-conversion + A list of conversion specifications, specifying conversion of + characters in one charset to another when decoding is performed. + Each specification is a list of two elements: the source charset, + and the destination charset. + +'output-charset-conversion + A list of conversion specifications, specifying conversion of + characters in one charset to another when encoding is performed. + The form of each specification is the same as for + 'input-charset-conversion. + + +The following additional properties are recognized (and required) +if TYPE is 'ccl: + +'decode + CCL program used for decoding (converting to internal format). + +'encode + CCL program used for encoding (converting to external format). +*/ + (name, type, doc_string, props)) +{ + Lisp_Coding_System *codesys; + Lisp_Object rest, key, value; + enum coding_system_type ty; + int need_to_setup_eol_systems = 1; + + /* Convert type to constant */ + if (NILP (type) || EQ (type, Qundecided)) + { ty = CODESYS_AUTODETECT; } +#ifdef MULE + else if (EQ (type, Qshift_jis)) { ty = CODESYS_SHIFT_JIS; } + else if (EQ (type, Qiso2022)) { ty = CODESYS_ISO2022; } + else if (EQ (type, Qbig5)) { ty = CODESYS_BIG5; } + else if (EQ (type, Qucs4)) { ty = CODESYS_UCS4; } + else if (EQ (type, Qutf8)) { ty = CODESYS_UTF8; } + else if (EQ (type, Qccl)) { ty = CODESYS_CCL; } +#endif + else if (EQ (type, Qno_conversion)) { ty = CODESYS_NO_CONVERSION; } +#ifdef DEBUG_XEMACS + else if (EQ (type, Qinternal)) { ty = CODESYS_INTERNAL; } +#endif + else + signal_simple_error ("Invalid coding system type", type); + + CHECK_SYMBOL (name); + + codesys = allocate_coding_system (ty, name); + + if (NILP (doc_string)) + doc_string = build_string (""); + else + CHECK_STRING (doc_string); + CODING_SYSTEM_DOC_STRING (codesys) = doc_string; + +#ifdef UTF2000 + if (ty == CODESYS_NO_CONVERSION) + codesys->fixed.size = 1; +#endif + EXTERNAL_PROPERTY_LIST_LOOP (rest, key, value, props) + { + if (EQ (key, Qmnemonic)) + { + if (!NILP (value)) + CHECK_STRING (value); + CODING_SYSTEM_MNEMONIC (codesys) = value; + } + + else if (EQ (key, Qeol_type)) + { + need_to_setup_eol_systems = NILP (value); + if (EQ (value, Qt)) + value = Qnil; + CODING_SYSTEM_EOL_TYPE (codesys) = symbol_to_eol_type (value); + } + + else if (EQ (key, Qpost_read_conversion)) CODING_SYSTEM_POST_READ_CONVERSION (codesys) = value; + else if (EQ (key, Qpre_write_conversion)) CODING_SYSTEM_PRE_WRITE_CONVERSION (codesys) = value; +#ifdef MULE + else if (ty == CODESYS_ISO2022) + { +#define FROB_INITIAL_CHARSET(charset_num) \ + CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, charset_num) = \ + ((EQ (value, Qt) || EQ (value, Qnil)) ? value : Fget_charset (value)) + + if (EQ (key, Qcharset_g0)) FROB_INITIAL_CHARSET (0); + else if (EQ (key, Qcharset_g1)) FROB_INITIAL_CHARSET (1); + else if (EQ (key, Qcharset_g2)) FROB_INITIAL_CHARSET (2); + else if (EQ (key, Qcharset_g3)) FROB_INITIAL_CHARSET (3); + +#define FROB_FORCE_CHARSET(charset_num) \ + CODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT (codesys, charset_num) = !NILP (value) + + else if (EQ (key, Qforce_g0_on_output)) FROB_FORCE_CHARSET (0); + else if (EQ (key, Qforce_g1_on_output)) FROB_FORCE_CHARSET (1); + else if (EQ (key, Qforce_g2_on_output)) FROB_FORCE_CHARSET (2); + else if (EQ (key, Qforce_g3_on_output)) FROB_FORCE_CHARSET (3); + +#define FROB_BOOLEAN_PROPERTY(prop) \ + CODING_SYSTEM_ISO2022_##prop (codesys) = !NILP (value) + + else if (EQ (key, Qshort)) FROB_BOOLEAN_PROPERTY (SHORT); + else if (EQ (key, Qno_ascii_eol)) FROB_BOOLEAN_PROPERTY (NO_ASCII_EOL); + else if (EQ (key, Qno_ascii_cntl)) FROB_BOOLEAN_PROPERTY (NO_ASCII_CNTL); + else if (EQ (key, Qseven)) FROB_BOOLEAN_PROPERTY (SEVEN); + else if (EQ (key, Qlock_shift)) FROB_BOOLEAN_PROPERTY (LOCK_SHIFT); + else if (EQ (key, Qno_iso6429)) FROB_BOOLEAN_PROPERTY (NO_ISO6429); + else if (EQ (key, Qescape_quoted)) FROB_BOOLEAN_PROPERTY (ESCAPE_QUOTED); + + else if (EQ (key, Qinput_charset_conversion)) + { + codesys->iso2022.input_conv = + Dynarr_new (charset_conversion_spec); + parse_charset_conversion_specs (codesys->iso2022.input_conv, + value); + } + else if (EQ (key, Qoutput_charset_conversion)) + { + codesys->iso2022.output_conv = + Dynarr_new (charset_conversion_spec); + parse_charset_conversion_specs (codesys->iso2022.output_conv, + value); + } + else + signal_simple_error ("Unrecognized property", key); + } + else if (EQ (type, Qccl)) + { + if (EQ (key, Qdecode)) + { + CHECK_VECTOR (value); + CODING_SYSTEM_CCL_DECODE (codesys) = value; + } + else if (EQ (key, Qencode)) + { + CHECK_VECTOR (value); + CODING_SYSTEM_CCL_ENCODE (codesys) = value; + } + else + signal_simple_error ("Unrecognized property", key); + } +#endif /* MULE */ + else + signal_simple_error ("Unrecognized property", key); + } + + if (need_to_setup_eol_systems) + setup_eol_coding_systems (codesys); + + { + Lisp_Object codesys_obj; + XSETCODING_SYSTEM (codesys_obj, codesys); + Fputhash (name, codesys_obj, Vcoding_system_hash_table); + return codesys_obj; + } +} + +DEFUN ("copy-coding-system", Fcopy_coding_system, 2, 2, 0, /* +Copy OLD-CODING-SYSTEM to NEW-NAME. +If NEW-NAME does not name an existing coding system, a new one will +be created. +*/ + (old_coding_system, new_name)) +{ + Lisp_Object new_coding_system; + old_coding_system = Fget_coding_system (old_coding_system); + new_coding_system = Ffind_coding_system (new_name); + if (NILP (new_coding_system)) + { + XSETCODING_SYSTEM (new_coding_system, + allocate_coding_system + (XCODING_SYSTEM_TYPE (old_coding_system), + new_name)); + Fputhash (new_name, new_coding_system, Vcoding_system_hash_table); + } + + { + Lisp_Coding_System *to = XCODING_SYSTEM (new_coding_system); + Lisp_Coding_System *from = XCODING_SYSTEM (old_coding_system); + memcpy (((char *) to ) + sizeof (to->header), + ((char *) from) + sizeof (from->header), + sizeof (*from) - sizeof (from->header)); + to->name = new_name; + } + return new_coding_system; +} + +DEFUN ("define-coding-system-alias", Fdefine_coding_system_alias, 2, 2, 0, /* +Define symbol ALIAS as an alias for coding system CODING-SYSTEM. +*/ + (alias, coding_system)) +{ + CHECK_SYMBOL (alias); + if (!NILP (Ffind_coding_system (alias))) + signal_simple_error ("Symbol already names a coding system", alias); + coding_system = Fget_coding_system (coding_system); + Fputhash (alias, coding_system, Vcoding_system_hash_table); + + /* Set up aliases for subsidiaries. */ + if (XCODING_SYSTEM_EOL_TYPE (coding_system) == EOL_AUTODETECT) + { + Lisp_Object str; + XSETSTRING (str, symbol_name (XSYMBOL (alias))); +#define FROB(type, name) \ + do { \ + Lisp_Object subsidiary = XCODING_SYSTEM_EOL_##type (coding_system); \ + if (!NILP (subsidiary)) \ + Fdefine_coding_system_alias \ + (Fintern (concat2 (str, build_string (name)), Qnil), subsidiary); \ + } while (0) + FROB (LF, "-unix"); + FROB (CRLF, "-dos"); + FROB (CR, "-mac"); +#undef FROB + } + /* FSF return value is a vector of [ALIAS-unix ALIAS-doc ALIAS-mac], + but it doesn't look intentional, so I'd rather return something + meaningful or nothing at all. */ + return Qnil; +} + +static Lisp_Object +subsidiary_coding_system (Lisp_Object coding_system, enum eol_type type) +{ + Lisp_Coding_System *cs = XCODING_SYSTEM (coding_system); + Lisp_Object new_coding_system; + + if (CODING_SYSTEM_EOL_TYPE (cs) != EOL_AUTODETECT) + return coding_system; + + switch (type) + { + case EOL_AUTODETECT: return coding_system; + case EOL_LF: new_coding_system = CODING_SYSTEM_EOL_LF (cs); break; + case EOL_CR: new_coding_system = CODING_SYSTEM_EOL_CR (cs); break; + case EOL_CRLF: new_coding_system = CODING_SYSTEM_EOL_CRLF (cs); break; + default: abort (); + } + + return NILP (new_coding_system) ? coding_system : new_coding_system; +} + +DEFUN ("subsidiary-coding-system", Fsubsidiary_coding_system, 2, 2, 0, /* +Return the subsidiary coding system of CODING-SYSTEM with eol type EOL-TYPE. +*/ + (coding_system, eol_type)) +{ + coding_system = Fget_coding_system (coding_system); + + return subsidiary_coding_system (coding_system, + symbol_to_eol_type (eol_type)); +} + + +/************************************************************************/ +/* Coding system accessors */ +/************************************************************************/ + +DEFUN ("coding-system-doc-string", Fcoding_system_doc_string, 1, 1, 0, /* +Return the doc string for CODING-SYSTEM. +*/ + (coding_system)) +{ + coding_system = Fget_coding_system (coding_system); + return XCODING_SYSTEM_DOC_STRING (coding_system); +} + +DEFUN ("coding-system-type", Fcoding_system_type, 1, 1, 0, /* +Return the type of CODING-SYSTEM. +*/ + (coding_system)) +{ + switch (XCODING_SYSTEM_TYPE (Fget_coding_system (coding_system))) + { + default: abort (); + case CODESYS_AUTODETECT: return Qundecided; +#ifdef MULE + case CODESYS_SHIFT_JIS: return Qshift_jis; + case CODESYS_ISO2022: return Qiso2022; + case CODESYS_BIG5: return Qbig5; + case CODESYS_UCS4: return Qucs4; + case CODESYS_UTF8: return Qutf8; + case CODESYS_CCL: return Qccl; +#endif + case CODESYS_NO_CONVERSION: return Qno_conversion; +#ifdef DEBUG_XEMACS + case CODESYS_INTERNAL: return Qinternal; +#endif + } +} + +#ifdef MULE +static +Lisp_Object coding_system_charset (Lisp_Object coding_system, int gnum) +{ + Lisp_Object cs + = XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (coding_system, gnum); + + return CHARSETP (cs) ? XCHARSET_NAME (cs) : Qnil; +} + +DEFUN ("coding-system-charset", Fcoding_system_charset, 2, 2, 0, /* +Return initial charset of CODING-SYSTEM designated to GNUM. +GNUM allows 0 .. 3. +*/ + (coding_system, gnum)) +{ + coding_system = Fget_coding_system (coding_system); + CHECK_INT (gnum); + + return coding_system_charset (coding_system, XINT (gnum)); +} +#endif /* MULE */ + +DEFUN ("coding-system-property", Fcoding_system_property, 2, 2, 0, /* +Return the PROP property of CODING-SYSTEM. +*/ + (coding_system, prop)) +{ + int i, ok = 0; + enum coding_system_type type; + + coding_system = Fget_coding_system (coding_system); + CHECK_SYMBOL (prop); + type = XCODING_SYSTEM_TYPE (coding_system); + + for (i = 0; !ok && i < Dynarr_length (the_codesys_prop_dynarr); i++) + if (EQ (Dynarr_at (the_codesys_prop_dynarr, i).sym, prop)) + { + ok = 1; + switch (Dynarr_at (the_codesys_prop_dynarr, i).prop_type) + { + case CODESYS_PROP_ALL_OK: + break; +#ifdef MULE + case CODESYS_PROP_ISO2022: + if (type != CODESYS_ISO2022) + signal_simple_error + ("Property only valid in ISO2022 coding systems", + prop); + break; + + case CODESYS_PROP_CCL: + if (type != CODESYS_CCL) + signal_simple_error + ("Property only valid in CCL coding systems", + prop); + break; +#endif /* MULE */ + default: + abort (); + } + } + + if (!ok) + signal_simple_error ("Unrecognized property", prop); + + if (EQ (prop, Qname)) + return XCODING_SYSTEM_NAME (coding_system); + else if (EQ (prop, Qtype)) + return Fcoding_system_type (coding_system); + else if (EQ (prop, Qdoc_string)) + return XCODING_SYSTEM_DOC_STRING (coding_system); + else if (EQ (prop, Qmnemonic)) + return XCODING_SYSTEM_MNEMONIC (coding_system); + else if (EQ (prop, Qeol_type)) + return eol_type_to_symbol (XCODING_SYSTEM_EOL_TYPE (coding_system)); + else if (EQ (prop, Qeol_lf)) + return XCODING_SYSTEM_EOL_LF (coding_system); + else if (EQ (prop, Qeol_crlf)) + return XCODING_SYSTEM_EOL_CRLF (coding_system); + else if (EQ (prop, Qeol_cr)) + return XCODING_SYSTEM_EOL_CR (coding_system); + else if (EQ (prop, Qpost_read_conversion)) + return XCODING_SYSTEM_POST_READ_CONVERSION (coding_system); + else if (EQ (prop, Qpre_write_conversion)) + return XCODING_SYSTEM_PRE_WRITE_CONVERSION (coding_system); +#ifdef MULE + else if (type == CODESYS_ISO2022) + { + if (EQ (prop, Qcharset_g0)) + return coding_system_charset (coding_system, 0); + else if (EQ (prop, Qcharset_g1)) + return coding_system_charset (coding_system, 1); + else if (EQ (prop, Qcharset_g2)) + return coding_system_charset (coding_system, 2); + else if (EQ (prop, Qcharset_g3)) + return coding_system_charset (coding_system, 3); + +#define FORCE_CHARSET(charset_num) \ + (XCODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT \ + (coding_system, charset_num) ? Qt : Qnil) + + else if (EQ (prop, Qforce_g0_on_output)) return FORCE_CHARSET (0); + else if (EQ (prop, Qforce_g1_on_output)) return FORCE_CHARSET (1); + else if (EQ (prop, Qforce_g2_on_output)) return FORCE_CHARSET (2); + else if (EQ (prop, Qforce_g3_on_output)) return FORCE_CHARSET (3); + +#define LISP_BOOLEAN(prop) \ + (XCODING_SYSTEM_ISO2022_##prop (coding_system) ? Qt : Qnil) + + else if (EQ (prop, Qshort)) return LISP_BOOLEAN (SHORT); + else if (EQ (prop, Qno_ascii_eol)) return LISP_BOOLEAN (NO_ASCII_EOL); + else if (EQ (prop, Qno_ascii_cntl)) return LISP_BOOLEAN (NO_ASCII_CNTL); + else if (EQ (prop, Qseven)) return LISP_BOOLEAN (SEVEN); + else if (EQ (prop, Qlock_shift)) return LISP_BOOLEAN (LOCK_SHIFT); + else if (EQ (prop, Qno_iso6429)) return LISP_BOOLEAN (NO_ISO6429); + else if (EQ (prop, Qescape_quoted)) return LISP_BOOLEAN (ESCAPE_QUOTED); + + else if (EQ (prop, Qinput_charset_conversion)) + return + unparse_charset_conversion_specs + (XCODING_SYSTEM (coding_system)->iso2022.input_conv); + else if (EQ (prop, Qoutput_charset_conversion)) + return + unparse_charset_conversion_specs + (XCODING_SYSTEM (coding_system)->iso2022.output_conv); + else + abort (); + } + else if (type == CODESYS_CCL) + { + if (EQ (prop, Qdecode)) + return XCODING_SYSTEM_CCL_DECODE (coding_system); + else if (EQ (prop, Qencode)) + return XCODING_SYSTEM_CCL_ENCODE (coding_system); + else + abort (); + } +#endif /* MULE */ + else + abort (); + + return Qnil; /* not reached */ +} + + +/************************************************************************/ +/* Coding category functions */ +/************************************************************************/ + +static int +decode_coding_category (Lisp_Object symbol) +{ + int i; + + CHECK_SYMBOL (symbol); + for (i = 0; i <= CODING_CATEGORY_LAST; i++) + if (EQ (coding_category_symbol[i], symbol)) + return i; + + signal_simple_error ("Unrecognized coding category", symbol); + return 0; /* not reached */ +} + +DEFUN ("coding-category-list", Fcoding_category_list, 0, 0, 0, /* +Return a list of all recognized coding categories. +*/ + ()) +{ + int i; + Lisp_Object list = Qnil; + + for (i = CODING_CATEGORY_LAST; i >= 0; i--) + list = Fcons (coding_category_symbol[i], list); + return list; +} + +DEFUN ("set-coding-priority-list", Fset_coding_priority_list, 1, 1, 0, /* +Change the priority order of the coding categories. +LIST should be list of coding categories, in descending order of +priority. Unspecified coding categories will be lower in priority +than all specified ones, in the same relative order they were in +previously. +*/ + (list)) +{ + int category_to_priority[CODING_CATEGORY_LAST + 1]; + int i, j; + Lisp_Object rest; + + /* First generate a list that maps coding categories to priorities. */ + + for (i = 0; i <= CODING_CATEGORY_LAST; i++) + category_to_priority[i] = -1; + + /* Highest priority comes from the specified list. */ + i = 0; + EXTERNAL_LIST_LOOP (rest, list) + { + int cat = decode_coding_category (XCAR (rest)); + + if (category_to_priority[cat] >= 0) + signal_simple_error ("Duplicate coding category in list", XCAR (rest)); + category_to_priority[cat] = i++; + } + + /* Now go through the existing categories by priority to retrieve + the categories not yet specified and preserve their priority + order. */ + for (j = 0; j <= CODING_CATEGORY_LAST; j++) + { + int cat = coding_category_by_priority[j]; + if (category_to_priority[cat] < 0) + category_to_priority[cat] = i++; + } + + /* Now we need to construct the inverse of the mapping we just + constructed. */ + + for (i = 0; i <= CODING_CATEGORY_LAST; i++) + coding_category_by_priority[category_to_priority[i]] = i; + + /* Phew! That was confusing. */ + return Qnil; +} + +DEFUN ("coding-priority-list", Fcoding_priority_list, 0, 0, 0, /* +Return a list of coding categories in descending order of priority. +*/ + ()) +{ + int i; + Lisp_Object list = Qnil; + + for (i = CODING_CATEGORY_LAST; i >= 0; i--) + list = Fcons (coding_category_symbol[coding_category_by_priority[i]], + list); + return list; +} + +DEFUN ("set-coding-category-system", Fset_coding_category_system, 2, 2, 0, /* +Change the coding system associated with a coding category. +*/ + (coding_category, coding_system)) +{ + int cat = decode_coding_category (coding_category); + + coding_system = Fget_coding_system (coding_system); + coding_category_system[cat] = coding_system; + return Qnil; +} + +DEFUN ("coding-category-system", Fcoding_category_system, 1, 1, 0, /* +Return the coding system associated with a coding category. +*/ + (coding_category)) +{ + int cat = decode_coding_category (coding_category); + Lisp_Object sys = coding_category_system[cat]; + + if (!NILP (sys)) + return XCODING_SYSTEM_NAME (sys); + return Qnil; +} + + +/************************************************************************/ +/* Detecting the encoding of data */ +/************************************************************************/ + +struct detection_state +{ + enum eol_type eol_type; + int seen_non_ascii; + int mask; +#ifdef MULE + struct + { + int mask; + int in_second_byte; + } + big5; + + struct + { + int mask; + int in_second_byte; + } + shift_jis; + + struct + { + int mask; + int in_byte; + } + ucs4; + + struct + { + int mask; + int in_byte; + } + utf8; + + struct + { + int mask; + int initted; + struct iso2022_decoder iso; + unsigned int flags; + int high_byte_count; + unsigned int saw_single_shift:1; + } + iso2022; +#endif + struct + { + int seen_anything; + int just_saw_cr; + } + eol; +}; + +static int +acceptable_control_char_p (int c) +{ + switch (c) + { + /* Allow and ignore control characters that you might + reasonably see in a text file */ + case '\r': + case '\n': + case '\t': + case 7: /* bell */ + case 8: /* backspace */ + case 11: /* vertical tab */ + case 12: /* form feed */ + case 26: /* MS-DOS C-z junk */ + case 31: /* '^_' -- for info */ + return 1; + default: + return 0; + } +} + +static int +mask_has_at_most_one_bit_p (int mask) +{ + /* Perhaps the only thing useful you learn from intensive Microsoft + technical interviews */ + return (mask & (mask - 1)) == 0; +} + +static enum eol_type +detect_eol_type (struct detection_state *st, CONST unsigned char *src, + unsigned int n) +{ + int c; + + while (n--) + { + c = *src++; + if (c == '\r') + st->eol.just_saw_cr = 1; + else + { + if (c == '\n') + { + if (st->eol.just_saw_cr) + return EOL_CRLF; + else if (st->eol.seen_anything) + return EOL_LF; + } + else if (st->eol.just_saw_cr) + return EOL_CR; + st->eol.just_saw_cr = 0; + } + st->eol.seen_anything = 1; + } + + return EOL_AUTODETECT; +} + +/* Attempt to determine the encoding and EOL type of the given text. + Before calling this function for the first type, you must initialize + st->eol_type as appropriate and initialize st->mask to ~0. + + st->eol_type holds the determined EOL type, or EOL_AUTODETECT if + not yet known. + + st->mask holds the determined coding category mask, or ~0 if only + ASCII has been seen so far. + + Returns: + + 0 == st->eol_type is EOL_AUTODETECT and/or more than coding category + is present in st->mask + 1 == definitive answers are here for both st->eol_type and st->mask +*/ + +static int +detect_coding_type (struct detection_state *st, CONST unsigned char *src, + unsigned int n, int just_do_eol) +{ + int c; + + if (st->eol_type == EOL_AUTODETECT) + st->eol_type = detect_eol_type (st, src, n); + + if (just_do_eol) + return st->eol_type != EOL_AUTODETECT; + + if (!st->seen_non_ascii) + { + for (; n; n--, src++) + { + c = *src; + if ((c < 0x20 && !acceptable_control_char_p (c)) || c >= 0x80) + { + st->seen_non_ascii = 1; +#ifdef MULE + st->shift_jis.mask = ~0; + st->big5.mask = ~0; + st->ucs4.mask = ~0; + st->utf8.mask = ~0; + st->iso2022.mask = ~0; +#endif + break; + } + } + } + + if (!n) + return 0; +#ifdef MULE + if (!mask_has_at_most_one_bit_p (st->iso2022.mask)) + st->iso2022.mask = detect_coding_iso2022 (st, src, n); + if (!mask_has_at_most_one_bit_p (st->shift_jis.mask)) + st->shift_jis.mask = detect_coding_sjis (st, src, n); + if (!mask_has_at_most_one_bit_p (st->big5.mask)) + st->big5.mask = detect_coding_big5 (st, src, n); + if (!mask_has_at_most_one_bit_p (st->utf8.mask)) + st->utf8.mask = detect_coding_utf8 (st, src, n); + if (!mask_has_at_most_one_bit_p (st->ucs4.mask)) + st->ucs4.mask = detect_coding_ucs4 (st, src, n); + + st->mask + = st->iso2022.mask | st->shift_jis.mask | st->big5.mask + | st->utf8.mask | st->ucs4.mask; +#endif + { + int retval = mask_has_at_most_one_bit_p (st->mask); + st->mask |= CODING_CATEGORY_NO_CONVERSION_MASK; + return retval && st->eol_type != EOL_AUTODETECT; + } +} + +static Lisp_Object +coding_system_from_mask (int mask) +{ + if (mask == ~0) + { + /* If the file was entirely or basically ASCII, use the + default value of `buffer-file-coding-system'. */ + Lisp_Object retval = + XBUFFER (Vbuffer_defaults)->buffer_file_coding_system; + if (!NILP (retval)) + { + retval = Ffind_coding_system (retval); + if (NILP (retval)) + { + warn_when_safe + (Qbad_variable, Qwarning, + "Invalid `default-buffer-file-coding-system', set to nil"); + XBUFFER (Vbuffer_defaults)->buffer_file_coding_system = Qnil; + } + } + if (NILP (retval)) + retval = Fget_coding_system (Qraw_text); + return retval; + } + else + { + int i; + int cat = -1; +#ifdef MULE + mask = postprocess_iso2022_mask (mask); +#endif + /* Look through the coding categories by priority and find + the first one that is allowed. */ + for (i = 0; i <= CODING_CATEGORY_LAST; i++) + { + cat = coding_category_by_priority[i]; + if ((mask & (1 << cat)) && + !NILP (coding_category_system[cat])) + break; + } + if (cat >= 0) + return coding_category_system[cat]; + else + return Fget_coding_system (Qraw_text); + } +} + +/* Given a seekable read stream and potential coding system and EOL type + as specified, do any autodetection that is called for. If the + coding system and/or EOL type are not autodetect, they will be left + alone; but this function will never return an autodetect coding system + or EOL type. + + This function does not automatically fetch subsidiary coding systems; + that should be unnecessary with the explicit eol-type argument. */ + +void +determine_real_coding_system (Lstream *stream, Lisp_Object *codesys_in_out, + enum eol_type *eol_type_in_out) +{ + struct detection_state decst; + + if (*eol_type_in_out == EOL_AUTODETECT) + *eol_type_in_out = XCODING_SYSTEM_EOL_TYPE (*codesys_in_out); + + xzero (decst); + decst.eol_type = *eol_type_in_out; + decst.mask = ~0; + + /* If autodetection is called for, do it now. */ + if (XCODING_SYSTEM_TYPE (*codesys_in_out) == CODESYS_AUTODETECT || + *eol_type_in_out == EOL_AUTODETECT) + { + unsigned char random_buffer[4096]; + int nread; + Lisp_Object coding_system = Qnil; + + nread = Lstream_read (stream, random_buffer, sizeof (random_buffer)); + if (nread) + { + unsigned char *cp = random_buffer; + + while (cp < random_buffer + nread) + { + if ((*cp++ == 'c') && (cp < random_buffer + nread) && + (*cp++ == 'o') && (cp < random_buffer + nread) && + (*cp++ == 'd') && (cp < random_buffer + nread) && + (*cp++ == 'i') && (cp < random_buffer + nread) && + (*cp++ == 'n') && (cp < random_buffer + nread) && + (*cp++ == 'g') && (cp < random_buffer + nread) && + (*cp++ == ':') && (cp < random_buffer + nread)) + { + unsigned char coding_system_name[4096 - 6]; + unsigned char *np = coding_system_name; + + while ( (cp < random_buffer + nread) + && ((*cp == ' ') || (*cp == '\t')) ) + { + cp++; + } + while ( (cp < random_buffer + nread) && + (*cp != ' ') && (*cp != '\t') && (*cp != ';') ) + { + *np++ = *cp++; + } + *np = 0; + coding_system + = Ffind_coding_system (intern (coding_system_name)); + break; + } + } + if (EQ(coding_system, Qnil)) + do{ + if (detect_coding_type (&decst, random_buffer, nread, + XCODING_SYSTEM_TYPE (*codesys_in_out) + != CODESYS_AUTODETECT)) + break; + nread = Lstream_read (stream, + random_buffer, sizeof (random_buffer)); + if (!nread) + break; + } while(1); + } + *eol_type_in_out = decst.eol_type; + if (XCODING_SYSTEM_TYPE (*codesys_in_out) == CODESYS_AUTODETECT) + { + if (EQ(coding_system, Qnil)) + *codesys_in_out = coding_system_from_mask (decst.mask); + else + *codesys_in_out = coding_system; + } + } + /* If we absolutely can't determine the EOL type, just assume LF. */ + if (*eol_type_in_out == EOL_AUTODETECT) + *eol_type_in_out = EOL_LF; + + Lstream_rewind (stream); +} + +DEFUN ("detect-coding-region", Fdetect_coding_region, 2, 3, 0, /* +Detect coding system of the text in the region between START and END. +Returned a list of possible coding systems ordered by priority. +If only ASCII characters are found, it returns 'undecided or one of +its subsidiary coding systems according to a detected end-of-line +type. Optional arg BUFFER defaults to the current buffer. +*/ + (start, end, buffer)) +{ + Lisp_Object val = Qnil; + struct buffer *buf = decode_buffer (buffer, 0); + Bufpos b, e; + Lisp_Object instream, lb_instream; + Lstream *istr, *lb_istr; + struct detection_state decst; + struct gcpro gcpro1, gcpro2; + + get_buffer_range_char (buf, start, end, &b, &e, 0); + lb_instream = make_lisp_buffer_input_stream (buf, b, e, 0); + lb_istr = XLSTREAM (lb_instream); + instream = make_encoding_input_stream (lb_istr, Fget_coding_system (Qbinary)); + istr = XLSTREAM (instream); + GCPRO2 (instream, lb_instream); + xzero (decst); + decst.eol_type = EOL_AUTODETECT; + decst.mask = ~0; + while (1) + { + unsigned char random_buffer[4096]; + int nread = Lstream_read (istr, random_buffer, sizeof (random_buffer)); + + if (!nread) + break; + if (detect_coding_type (&decst, random_buffer, nread, 0)) + break; + } + + if (decst.mask == ~0) + val = subsidiary_coding_system (Fget_coding_system (Qundecided), + decst.eol_type); + else + { + int i; + + val = Qnil; +#ifdef MULE + decst.mask = postprocess_iso2022_mask (decst.mask); +#endif + for (i = CODING_CATEGORY_LAST; i >= 0; i--) + { + int sys = coding_category_by_priority[i]; + if (decst.mask & (1 << sys)) + { + Lisp_Object codesys = coding_category_system[sys]; + if (!NILP (codesys)) + codesys = subsidiary_coding_system (codesys, decst.eol_type); + val = Fcons (codesys, val); + } + } + } + Lstream_close (istr); + UNGCPRO; + Lstream_delete (istr); + Lstream_delete (lb_istr); + return val; +} + + +/************************************************************************/ +/* Converting to internal Mule format ("decoding") */ +/************************************************************************/ + +/* A decoding stream is a stream used for decoding text (i.e. + converting from some external format to internal format). + The decoding-stream object keeps track of the actual coding + stream, the stream that is at the other end, and data that + needs to be persistent across the lifetime of the stream. */ + +/* Handle the EOL stuff related to just-read-in character C. + EOL_TYPE is the EOL type of the coding stream. + FLAGS is the current value of FLAGS in the coding stream, and may + be modified by this macro. (The macro only looks at the + CODING_STATE_CR flag.) DST is the Dynarr to which the decoded + bytes are to be written. You need to also define a local goto + label "label_continue_loop" that is at the end of the main + character-reading loop. + + If C is a CR character, then this macro handles it entirely and + jumps to label_continue_loop. Otherwise, this macro does not add + anything to DST, and continues normally. You should continue + processing C normally after this macro. */ + +#define DECODE_HANDLE_EOL_TYPE(eol_type, c, flags, dst) \ +do { \ + if (c == '\r') \ + { \ + if (eol_type == EOL_CR) \ + Dynarr_add (dst, '\n'); \ + else if (eol_type != EOL_CRLF || flags & CODING_STATE_CR) \ + Dynarr_add (dst, c); \ + else \ + flags |= CODING_STATE_CR; \ + goto label_continue_loop; \ + } \ + else if (flags & CODING_STATE_CR) \ + { /* eol_type == CODING_SYSTEM_EOL_CRLF */ \ + if (c != '\n') \ + Dynarr_add (dst, '\r'); \ + flags &= ~CODING_STATE_CR; \ + } \ +} while (0) + +/* C should be a binary character in the range 0 - 255; convert + to internal format and add to Dynarr DST. */ + +#ifdef UTF2000 +#define DECODE_ADD_BINARY_CHAR(c, dst) \ +do { \ + if (BYTE_ASCII_P (c)) \ + Dynarr_add (dst, c); \ + else \ + { \ + Dynarr_add (dst, (c >> 6) | 0xc0); \ + Dynarr_add (dst, (c & 0x3f) | 0x80); \ + } \ +} while (0) + +INLINE void +DECODE_ADD_UCS_CHAR(Emchar c, unsigned_char_dynarr* dst) +{ + if ( c <= 0x7f ) + { + Dynarr_add (dst, c); + } + else if ( c <= 0x7ff ) + { + Dynarr_add (dst, (c >> 6) | 0xc0); + Dynarr_add (dst, (c & 0x3f) | 0x80); + } + else if ( c <= 0xffff ) + { + Dynarr_add (dst, (c >> 12) | 0xe0); + Dynarr_add (dst, ((c >> 6) & 0x3f) | 0x80); + Dynarr_add (dst, (c & 0x3f) | 0x80); + } + else if ( c <= 0x1fffff ) + { + Dynarr_add (dst, (c >> 18) | 0xf0); + Dynarr_add (dst, ((c >> 12) & 0x3f) | 0x80); + Dynarr_add (dst, ((c >> 6) & 0x3f) | 0x80); + Dynarr_add (dst, (c & 0x3f) | 0x80); + } + else if ( c <= 0x3ffffff ) + { + Dynarr_add (dst, (c >> 24) | 0xf8); + Dynarr_add (dst, ((c >> 18) & 0x3f) | 0x80); + Dynarr_add (dst, ((c >> 12) & 0x3f) | 0x80); + Dynarr_add (dst, ((c >> 6) & 0x3f) | 0x80); + Dynarr_add (dst, (c & 0x3f) | 0x80); + } + else + { + Dynarr_add (dst, (c >> 30) | 0xfc); + Dynarr_add (dst, ((c >> 24) & 0x3f) | 0x80); + Dynarr_add (dst, ((c >> 18) & 0x3f) | 0x80); + Dynarr_add (dst, ((c >> 12) & 0x3f) | 0x80); + Dynarr_add (dst, ((c >> 6) & 0x3f) | 0x80); + Dynarr_add (dst, (c & 0x3f) | 0x80); + } +} +#else +#define DECODE_ADD_BINARY_CHAR(c, dst) \ +do { \ + if (BYTE_ASCII_P (c)) \ + Dynarr_add (dst, c); \ + else if (BYTE_C1_P (c)) \ + { \ + Dynarr_add (dst, LEADING_BYTE_CONTROL_1); \ + Dynarr_add (dst, c + 0x20); \ + } \ + else \ + { \ + Dynarr_add (dst, LEADING_BYTE_LATIN_ISO8859_1); \ + Dynarr_add (dst, c); \ + } \ +} while (0) +#endif + +#define DECODE_OUTPUT_PARTIAL_CHAR(ch) \ +do { \ + if (ch) \ + { \ + DECODE_ADD_BINARY_CHAR (ch, dst); \ + ch = 0; \ + } \ +} while (0) + +#define DECODE_HANDLE_END_OF_CONVERSION(flags, ch, dst) \ +do { \ + if (flags & CODING_STATE_END) \ + { \ + DECODE_OUTPUT_PARTIAL_CHAR (ch); \ + if (flags & CODING_STATE_CR) \ + Dynarr_add (dst, '\r'); \ + } \ +} while (0) + +#define DECODING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, decoding) + +struct decoding_stream +{ + /* Coding system that governs the conversion. */ + Lisp_Coding_System *codesys; + + /* Stream that we read the encoded data from or + write the decoded data to. */ + Lstream *other_end; + + /* If we are reading, then we can return only a fixed amount of + data, so if the conversion resulted in too much data, we store it + here for retrieval the next time around. */ + unsigned_char_dynarr *runoff; + + /* FLAGS holds flags indicating the current state of the decoding. + Some of these flags are dependent on the coding system. */ + unsigned int flags; + + /* CH holds a partially built-up character. Since we only deal + with one- and two-byte characters at the moment, we only use + this to store the first byte of a two-byte character. */ + unsigned int ch; + + /* EOL_TYPE specifies the type of end-of-line conversion that + currently applies. We need to keep this separate from the + EOL type stored in CODESYS because the latter might indicate + automatic EOL-type detection while the former will always + indicate a particular EOL type. */ + enum eol_type eol_type; +#ifdef MULE + /* Additional ISO2022 information. We define the structure above + because it's also needed by the detection routines. */ + struct iso2022_decoder iso2022; + + /* Additional information (the state of the running CCL program) + used by the CCL decoder. */ + struct ccl_program ccl; + + /* counter for UTF-8 or UCS-4 */ + unsigned char counter; +#endif + struct detection_state decst; +}; + +static int decoding_reader (Lstream *stream, unsigned char *data, size_t size); +static int decoding_writer (Lstream *stream, CONST unsigned char *data, size_t size); +static int decoding_rewinder (Lstream *stream); +static int decoding_seekable_p (Lstream *stream); +static int decoding_flusher (Lstream *stream); +static int decoding_closer (Lstream *stream); + +static Lisp_Object decoding_marker (Lisp_Object stream, + void (*markobj) (Lisp_Object)); + +DEFINE_LSTREAM_IMPLEMENTATION ("decoding", lstream_decoding, + sizeof (struct decoding_stream)); + +static Lisp_Object +decoding_marker (Lisp_Object stream, void (*markobj) (Lisp_Object)) +{ + Lstream *str = DECODING_STREAM_DATA (XLSTREAM (stream))->other_end; + Lisp_Object str_obj; + + /* We do not need to mark the coding systems or charsets stored + within the stream because they are stored in a global list + and automatically marked. */ + + XSETLSTREAM (str_obj, str); + markobj (str_obj); + if (str->imp->marker) + return (str->imp->marker) (str_obj, markobj); + else + return Qnil; +} + +/* Read SIZE bytes of data and store it into DATA. We are a decoding stream + so we read data from the other end, decode it, and store it into DATA. */ + +static int +decoding_reader (Lstream *stream, unsigned char *data, size_t size) +{ + struct decoding_stream *str = DECODING_STREAM_DATA (stream); + unsigned char *orig_data = data; + int read_size; + int error_occurred = 0; + + /* We need to interface to mule_decode(), which expects to take some + amount of data and store the result into a Dynarr. We have + mule_decode() store into str->runoff, and take data from there + as necessary. */ + + /* We loop until we have enough data, reading chunks from the other + end and decoding it. */ + while (1) + { + /* Take data from the runoff if we can. Make sure to take at + most SIZE bytes, and delete the data from the runoff. */ + if (Dynarr_length (str->runoff) > 0) + { + size_t chunk = min (size, (size_t) Dynarr_length (str->runoff)); + memcpy (data, Dynarr_atp (str->runoff, 0), chunk); + Dynarr_delete_many (str->runoff, 0, chunk); + data += chunk; + size -= chunk; + } + + if (size == 0) + break; /* No more room for data */ + + if (str->flags & CODING_STATE_END) + /* This means that on the previous iteration, we hit the EOF on + the other end. We loop once more so that mule_decode() can + output any final stuff it may be holding, or any "go back + to a sane state" escape sequences. (This latter makes sense + during encoding.) */ + break; + + /* Exhausted the runoff, so get some more. DATA has at least + SIZE bytes left of storage in it, so it's OK to read directly + into it. (We'll be overwriting above, after we've decoded it + into the runoff.) */ + read_size = Lstream_read (str->other_end, data, size); + if (read_size < 0) + { + error_occurred = 1; + break; + } + if (read_size == 0) + /* There might be some more end data produced in the translation. + See the comment above. */ + str->flags |= CODING_STATE_END; + mule_decode (stream, data, str->runoff, read_size); + } + + if (data - orig_data == 0) + return error_occurred ? -1 : 0; + else + return data - orig_data; +} + +static int +decoding_writer (Lstream *stream, CONST unsigned char *data, size_t size) +{ + struct decoding_stream *str = DECODING_STREAM_DATA (stream); + int retval; + + /* Decode all our data into the runoff, and then attempt to write + it all out to the other end. Remove whatever chunk we succeeded + in writing. */ + mule_decode (stream, data, str->runoff, size); + retval = Lstream_write (str->other_end, Dynarr_atp (str->runoff, 0), + Dynarr_length (str->runoff)); + if (retval > 0) + Dynarr_delete_many (str->runoff, 0, retval); + /* Do NOT return retval. The return value indicates how much + of the incoming data was written, not how many bytes were + written. */ + return size; +} + +static void +reset_decoding_stream (struct decoding_stream *str) +{ +#ifdef MULE + if (CODING_SYSTEM_TYPE (str->codesys) == CODESYS_ISO2022) + { + Lisp_Object coding_system; + XSETCODING_SYSTEM (coding_system, str->codesys); + reset_iso2022 (coding_system, &str->iso2022); + } + else if (CODING_SYSTEM_TYPE (str->codesys) == CODESYS_CCL) + { + setup_ccl_program (&str->ccl, CODING_SYSTEM_CCL_DECODE (str->codesys)); + } + str->counter = 0; +#endif /* MULE */ + str->flags = str->ch = 0; +} + +static int +decoding_rewinder (Lstream *stream) +{ + struct decoding_stream *str = DECODING_STREAM_DATA (stream); + reset_decoding_stream (str); + Dynarr_reset (str->runoff); + return Lstream_rewind (str->other_end); +} + +static int +decoding_seekable_p (Lstream *stream) +{ + struct decoding_stream *str = DECODING_STREAM_DATA (stream); + return Lstream_seekable_p (str->other_end); +} + +static int +decoding_flusher (Lstream *stream) +{ + struct decoding_stream *str = DECODING_STREAM_DATA (stream); + return Lstream_flush (str->other_end); +} + +static int +decoding_closer (Lstream *stream) +{ + struct decoding_stream *str = DECODING_STREAM_DATA (stream); + if (stream->flags & LSTREAM_FL_WRITE) + { + str->flags |= CODING_STATE_END; + decoding_writer (stream, 0, 0); + } + Dynarr_free (str->runoff); +#ifdef MULE +#ifdef ENABLE_COMPOSITE_CHARS + if (str->iso2022.composite_chars) + Dynarr_free (str->iso2022.composite_chars); +#endif +#endif + return Lstream_close (str->other_end); +} + +Lisp_Object +decoding_stream_coding_system (Lstream *stream) +{ + Lisp_Object coding_system; + struct decoding_stream *str = DECODING_STREAM_DATA (stream); + + XSETCODING_SYSTEM (coding_system, str->codesys); + return subsidiary_coding_system (coding_system, str->eol_type); +} + +void +set_decoding_stream_coding_system (Lstream *lstr, Lisp_Object codesys) +{ + Lisp_Coding_System *cs = XCODING_SYSTEM (codesys); + struct decoding_stream *str = DECODING_STREAM_DATA (lstr); + str->codesys = cs; + if (CODING_SYSTEM_EOL_TYPE (cs) != EOL_AUTODETECT) + str->eol_type = CODING_SYSTEM_EOL_TYPE (cs); + reset_decoding_stream (str); +} + +/* WARNING WARNING WARNING WARNING!!!!! If you open up a decoding + stream for writing, no automatic code detection will be performed. + The reason for this is that automatic code detection requires a + seekable input. Things will also fail if you open a decoding + stream for reading using a non-fully-specified coding system and + a non-seekable input stream. */ + +static Lisp_Object +make_decoding_stream_1 (Lstream *stream, Lisp_Object codesys, + CONST char *mode) +{ + Lstream *lstr = Lstream_new (lstream_decoding, mode); + struct decoding_stream *str = DECODING_STREAM_DATA (lstr); + Lisp_Object obj; + + xzero (*str); + str->other_end = stream; + str->runoff = (unsigned_char_dynarr *) Dynarr_new (unsigned_char); + str->eol_type = EOL_AUTODETECT; + if (!strcmp (mode, "r") + && Lstream_seekable_p (stream)) + /* We can determine the coding system now. */ + determine_real_coding_system (stream, &codesys, &str->eol_type); + set_decoding_stream_coding_system (lstr, codesys); + str->decst.eol_type = str->eol_type; + str->decst.mask = ~0; + XSETLSTREAM (obj, lstr); + return obj; +} + +Lisp_Object +make_decoding_input_stream (Lstream *stream, Lisp_Object codesys) +{ + return make_decoding_stream_1 (stream, codesys, "r"); +} + +Lisp_Object +make_decoding_output_stream (Lstream *stream, Lisp_Object codesys) +{ + return make_decoding_stream_1 (stream, codesys, "w"); +} + +/* Note: the decode_coding_* functions all take the same + arguments as mule_decode(), which is to say some SRC data of + size N, which is to be stored into dynamic array DST. + DECODING is the stream within which the decoding is + taking place, but no data is actually read from or + written to that stream; that is handled in decoding_reader() + or decoding_writer(). This allows the same functions to + be used for both reading and writing. */ + +static void +mule_decode (Lstream *decoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + struct decoding_stream *str = DECODING_STREAM_DATA (decoding); + + /* If necessary, do encoding-detection now. We do this when + we're a writing stream or a non-seekable reading stream, + meaning that we can't just process the whole input, + rewind, and start over. */ + + if (CODING_SYSTEM_TYPE (str->codesys) == CODESYS_AUTODETECT || + str->eol_type == EOL_AUTODETECT) + { + Lisp_Object codesys; + + XSETCODING_SYSTEM (codesys, str->codesys); + detect_coding_type (&str->decst, src, n, + CODING_SYSTEM_TYPE (str->codesys) != + CODESYS_AUTODETECT); + if (CODING_SYSTEM_TYPE (str->codesys) == CODESYS_AUTODETECT && + str->decst.mask != ~0) + /* #### This is cheesy. What we really ought to do is + buffer up a certain amount of data so as to get a + less random result. */ + codesys = coding_system_from_mask (str->decst.mask); + str->eol_type = str->decst.eol_type; + if (XCODING_SYSTEM (codesys) != str->codesys) + { + /* Preserve the CODING_STATE_END flag in case it was set. + If we erase it, bad things might happen. */ + int was_end = str->flags & CODING_STATE_END; + set_decoding_stream_coding_system (decoding, codesys); + if (was_end) + str->flags |= CODING_STATE_END; + } + } + + switch (CODING_SYSTEM_TYPE (str->codesys)) + { +#ifdef DEBUG_XEMACS + case CODESYS_INTERNAL: + Dynarr_add_many (dst, src, n); + break; +#endif + case CODESYS_AUTODETECT: + /* If we got this far and still haven't decided on the coding + system, then do no conversion. */ + case CODESYS_NO_CONVERSION: + decode_coding_no_conversion (decoding, src, dst, n); + break; +#ifdef MULE + case CODESYS_SHIFT_JIS: + decode_coding_sjis (decoding, src, dst, n); + break; + case CODESYS_BIG5: + decode_coding_big5 (decoding, src, dst, n); + break; + case CODESYS_UCS4: + decode_coding_ucs4 (decoding, src, dst, n); + break; + case CODESYS_UTF8: + decode_coding_utf8 (decoding, src, dst, n); + break; + case CODESYS_CCL: + str->ccl.last_block = str->flags & CODING_STATE_END; + ccl_driver (&str->ccl, src, dst, n, 0, CCL_MODE_DECODING); + break; + case CODESYS_ISO2022: + decode_coding_iso2022 (decoding, src, dst, n); + break; +#endif /* MULE */ + default: + abort (); + } +} + +DEFUN ("decode-coding-region", Fdecode_coding_region, 3, 4, 0, /* +Decode the text between START and END which is encoded in CODING-SYSTEM. +This is useful if you've read in encoded text from a file without decoding +it (e.g. you read in a JIS-formatted file but used the `binary' or +`no-conversion' coding system, so that it shows up as "^[$B! [ENCODE AS BINARY] + ------> [DECODE AS SPECIFIED] + ------> [BUFFER] + */ + + while (1) + { + char tempbuf[1024]; /* some random amount */ + Bufpos newpos, even_newer_pos; + Bufpos oldpos = lisp_buffer_stream_startpos (istr); + int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf)); + + if (!size_in_bytes) + break; + newpos = lisp_buffer_stream_startpos (istr); + Lstream_write (ostr, tempbuf, size_in_bytes); + even_newer_pos = lisp_buffer_stream_startpos (istr); + buffer_delete_range (buf, even_newer_pos - (newpos - oldpos), + even_newer_pos, 0); + } + Lstream_close (istr); + Lstream_close (ostr); + UNGCPRO; + Lstream_delete (istr); + Lstream_delete (ostr); + Lstream_delete (XLSTREAM (de_outstream)); + Lstream_delete (XLSTREAM (lb_outstream)); + return Qnil; +} + + +/************************************************************************/ +/* Converting to an external encoding ("encoding") */ +/************************************************************************/ + +/* An encoding stream is an output stream. When you create the + stream, you specify the coding system that governs the encoding + and another stream that the resulting encoded data is to be + sent to, and then start sending data to it. */ + +#define ENCODING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, encoding) + +struct encoding_stream +{ + /* Coding system that governs the conversion. */ + Lisp_Coding_System *codesys; + + /* Stream that we read the encoded data from or + write the decoded data to. */ + Lstream *other_end; + + /* If we are reading, then we can return only a fixed amount of + data, so if the conversion resulted in too much data, we store it + here for retrieval the next time around. */ + unsigned_char_dynarr *runoff; + + /* FLAGS holds flags indicating the current state of the encoding. + Some of these flags are dependent on the coding system. */ + unsigned int flags; + + /* CH holds a partially built-up character. Since we only deal + with one- and two-byte characters at the moment, we only use + this to store the first byte of a two-byte character. */ + unsigned int ch; +#ifdef MULE + /* Additional information used by the ISO2022 encoder. */ + struct + { + /* CHARSET holds the character sets currently assigned to the G0 + through G3 registers. It is initialized from the array + INITIAL_CHARSET in CODESYS. */ + Lisp_Object charset[4]; + + /* Which registers are currently invoked into the left (GL) and + right (GR) halves of the 8-bit encoding space? */ + int register_left, register_right; + + /* Whether we need to explicitly designate the charset in the + G? register before using it. It is initialized from the + array FORCE_CHARSET_ON_OUTPUT in CODESYS. */ + unsigned char force_charset_on_output[4]; + + /* Other state variables that need to be preserved across + invocations. */ + Lisp_Object current_charset; + int current_half; + int current_char_boundary; + } iso2022; + + void (*encode_char) (struct encoding_stream *str, Emchar c, + unsigned_char_dynarr *dst, unsigned int *flags); + void (*finish) (struct encoding_stream *str, + unsigned_char_dynarr *dst, unsigned int *flags); + + /* Additional information (the state of the running CCL program) + used by the CCL encoder. */ + struct ccl_program ccl; +#endif /* MULE */ +}; + +static int encoding_reader (Lstream *stream, unsigned char *data, size_t size); +static int encoding_writer (Lstream *stream, CONST unsigned char *data, + size_t size); +static int encoding_rewinder (Lstream *stream); +static int encoding_seekable_p (Lstream *stream); +static int encoding_flusher (Lstream *stream); +static int encoding_closer (Lstream *stream); + +static Lisp_Object encoding_marker (Lisp_Object stream, + void (*markobj) (Lisp_Object)); + +DEFINE_LSTREAM_IMPLEMENTATION ("encoding", lstream_encoding, + sizeof (struct encoding_stream)); + +static Lisp_Object +encoding_marker (Lisp_Object stream, void (*markobj) (Lisp_Object)) +{ + Lstream *str = ENCODING_STREAM_DATA (XLSTREAM (stream))->other_end; + Lisp_Object str_obj; + + /* We do not need to mark the coding systems or charsets stored + within the stream because they are stored in a global list + and automatically marked. */ + + XSETLSTREAM (str_obj, str); + markobj (str_obj); + if (str->imp->marker) + return (str->imp->marker) (str_obj, markobj); + else + return Qnil; +} + +/* Read SIZE bytes of data and store it into DATA. We are a encoding stream + so we read data from the other end, encode it, and store it into DATA. */ + +static int +encoding_reader (Lstream *stream, unsigned char *data, size_t size) +{ + struct encoding_stream *str = ENCODING_STREAM_DATA (stream); + unsigned char *orig_data = data; + int read_size; + int error_occurred = 0; + + /* We need to interface to mule_encode(), which expects to take some + amount of data and store the result into a Dynarr. We have + mule_encode() store into str->runoff, and take data from there + as necessary. */ + + /* We loop until we have enough data, reading chunks from the other + end and encoding it. */ + while (1) + { + /* Take data from the runoff if we can. Make sure to take at + most SIZE bytes, and delete the data from the runoff. */ + if (Dynarr_length (str->runoff) > 0) + { + int chunk = min ((int) size, Dynarr_length (str->runoff)); + memcpy (data, Dynarr_atp (str->runoff, 0), chunk); + Dynarr_delete_many (str->runoff, 0, chunk); + data += chunk; + size -= chunk; + } + + if (size == 0) + break; /* No more room for data */ + + if (str->flags & CODING_STATE_END) + /* This means that on the previous iteration, we hit the EOF on + the other end. We loop once more so that mule_encode() can + output any final stuff it may be holding, or any "go back + to a sane state" escape sequences. (This latter makes sense + during encoding.) */ + break; + + /* Exhausted the runoff, so get some more. DATA at least SIZE bytes + left of storage in it, so it's OK to read directly into it. + (We'll be overwriting above, after we've encoded it into the + runoff.) */ + read_size = Lstream_read (str->other_end, data, size); + if (read_size < 0) + { + error_occurred = 1; + break; + } + if (read_size == 0) + /* There might be some more end data produced in the translation. + See the comment above. */ + str->flags |= CODING_STATE_END; + mule_encode (stream, data, str->runoff, read_size); + } + + if (data == orig_data) + return error_occurred ? -1 : 0; + else + return data - orig_data; +} + +static int +encoding_writer (Lstream *stream, CONST unsigned char *data, size_t size) +{ + struct encoding_stream *str = ENCODING_STREAM_DATA (stream); + int retval; + + /* Encode all our data into the runoff, and then attempt to write + it all out to the other end. Remove whatever chunk we succeeded + in writing. */ + mule_encode (stream, data, str->runoff, size); + retval = Lstream_write (str->other_end, Dynarr_atp (str->runoff, 0), + Dynarr_length (str->runoff)); + if (retval > 0) + Dynarr_delete_many (str->runoff, 0, retval); + /* Do NOT return retval. The return value indicates how much + of the incoming data was written, not how many bytes were + written. */ + return size; +} + +static void +reset_encoding_stream (struct encoding_stream *str) +{ +#ifdef MULE + switch (CODING_SYSTEM_TYPE (str->codesys)) + { + case CODESYS_ISO2022: + { + int i; + + str->encode_char = &char_encode_iso2022; + str->finish = &char_finish_iso2022; + for (i = 0; i < 4; i++) + { + str->iso2022.charset[i] = + CODING_SYSTEM_ISO2022_INITIAL_CHARSET (str->codesys, i); + str->iso2022.force_charset_on_output[i] = + CODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT (str->codesys, i); + } + str->iso2022.register_left = 0; + str->iso2022.register_right = 1; + str->iso2022.current_charset = Qnil; + str->iso2022.current_half = 0; + break; + } + case CODESYS_CCL: + setup_ccl_program (&str->ccl, CODING_SYSTEM_CCL_ENCODE (str->codesys)); + break; + case CODESYS_UTF8: + str->encode_char = &char_encode_utf8; + str->finish = &char_finish_utf8; + default: + break; + } +#endif /* MULE */ + str->iso2022.current_char_boundary = 0; + str->flags = str->ch = 0; +} + +static int +encoding_rewinder (Lstream *stream) +{ + struct encoding_stream *str = ENCODING_STREAM_DATA (stream); + reset_encoding_stream (str); + Dynarr_reset (str->runoff); + return Lstream_rewind (str->other_end); +} + +static int +encoding_seekable_p (Lstream *stream) +{ + struct encoding_stream *str = ENCODING_STREAM_DATA (stream); + return Lstream_seekable_p (str->other_end); +} + +static int +encoding_flusher (Lstream *stream) +{ + struct encoding_stream *str = ENCODING_STREAM_DATA (stream); + return Lstream_flush (str->other_end); +} + +static int +encoding_closer (Lstream *stream) +{ + struct encoding_stream *str = ENCODING_STREAM_DATA (stream); + if (stream->flags & LSTREAM_FL_WRITE) + { + str->flags |= CODING_STATE_END; + encoding_writer (stream, 0, 0); + } + Dynarr_free (str->runoff); + return Lstream_close (str->other_end); +} + +Lisp_Object +encoding_stream_coding_system (Lstream *stream) +{ + Lisp_Object coding_system; + struct encoding_stream *str = ENCODING_STREAM_DATA (stream); + + XSETCODING_SYSTEM (coding_system, str->codesys); + return coding_system; +} + +void +set_encoding_stream_coding_system (Lstream *lstr, Lisp_Object codesys) +{ + Lisp_Coding_System *cs = XCODING_SYSTEM (codesys); + struct encoding_stream *str = ENCODING_STREAM_DATA (lstr); + str->codesys = cs; + reset_encoding_stream (str); +} + +static Lisp_Object +make_encoding_stream_1 (Lstream *stream, Lisp_Object codesys, + CONST char *mode) +{ + Lstream *lstr = Lstream_new (lstream_encoding, mode); + struct encoding_stream *str = ENCODING_STREAM_DATA (lstr); + Lisp_Object obj; + + xzero (*str); + str->runoff = Dynarr_new (unsigned_char); + str->other_end = stream; + set_encoding_stream_coding_system (lstr, codesys); + XSETLSTREAM (obj, lstr); + return obj; +} + +Lisp_Object +make_encoding_input_stream (Lstream *stream, Lisp_Object codesys) +{ + return make_encoding_stream_1 (stream, codesys, "r"); +} + +Lisp_Object +make_encoding_output_stream (Lstream *stream, Lisp_Object codesys) +{ + return make_encoding_stream_1 (stream, codesys, "w"); +} + +/* Convert N bytes of internally-formatted data stored in SRC to an + external format, according to the encoding stream ENCODING. + Store the encoded data into DST. */ + +static void +mule_encode (Lstream *encoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + struct encoding_stream *str = ENCODING_STREAM_DATA (encoding); + + switch (CODING_SYSTEM_TYPE (str->codesys)) + { +#ifdef DEBUG_XEMACS + case CODESYS_INTERNAL: + Dynarr_add_many (dst, src, n); + break; +#endif + case CODESYS_AUTODETECT: + /* If we got this far and still haven't decided on the coding + system, then do no conversion. */ + case CODESYS_NO_CONVERSION: + encode_coding_no_conversion (encoding, src, dst, n); + break; +#ifdef MULE + case CODESYS_SHIFT_JIS: + encode_coding_sjis (encoding, src, dst, n); + break; + case CODESYS_BIG5: + encode_coding_big5 (encoding, src, dst, n); + break; + case CODESYS_UCS4: + encode_coding_ucs4 (encoding, src, dst, n); + break; + case CODESYS_CCL: + str->ccl.last_block = str->flags & CODING_STATE_END; + ccl_driver (&str->ccl, src, dst, n, 0, CCL_MODE_ENCODING); + break; +#endif /* MULE */ + default: + text_encode_generic (encoding, src, dst, n); + } +} + +DEFUN ("encode-coding-region", Fencode_coding_region, 3, 4, 0, /* +Encode the text between START and END using CODING-SYSTEM. +This will, for example, convert Japanese characters into stuff such as +"^[$B! [ENCODE AS SPECIFIED] + ------> [DECODE AS BINARY] + ------> [BUFFER] + */ + while (1) + { + char tempbuf[1024]; /* some random amount */ + Bufpos newpos, even_newer_pos; + Bufpos oldpos = lisp_buffer_stream_startpos (istr); + int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf)); + + if (!size_in_bytes) + break; + newpos = lisp_buffer_stream_startpos (istr); + Lstream_write (ostr, tempbuf, size_in_bytes); + even_newer_pos = lisp_buffer_stream_startpos (istr); + buffer_delete_range (buf, even_newer_pos - (newpos - oldpos), + even_newer_pos, 0); + } + + { + Charcount retlen = + lisp_buffer_stream_startpos (XLSTREAM (instream)) - b; + Lstream_close (istr); + Lstream_close (ostr); + UNGCPRO; + Lstream_delete (istr); + Lstream_delete (ostr); + Lstream_delete (XLSTREAM (de_outstream)); + Lstream_delete (XLSTREAM (lb_outstream)); + return make_int (retlen); + } +} + +#ifdef MULE + +static void +text_encode_generic (Lstream *encoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + unsigned char c; + unsigned char char_boundary; + struct encoding_stream *str = ENCODING_STREAM_DATA (encoding); + unsigned int flags = str->flags; + Emchar ch = str->ch; + Lisp_Object charset; + int half; + + char_boundary = str->iso2022.current_char_boundary; + charset = str->iso2022.current_charset; + half = str->iso2022.current_half; + + while (n--) + { + c = *src++; + + switch (char_boundary) + { + case 0: + if ( c >= 0xfc ) + { + ch = c & 0x01; + char_boundary = 5; + } + else if ( c >= 0xf8 ) + { + ch = c & 0x03; + char_boundary = 4; + } + else if ( c >= 0xf0 ) + { + ch = c & 0x07; + char_boundary = 3; + } + else if ( c >= 0xe0 ) + { + ch = c & 0x0f; + char_boundary = 2; + } + else if ( c >= 0xc0 ) + { + ch = c & 0x1f; + char_boundary = 1; + } + else + { + (*str->encode_char) (str, c, dst, &flags); + ch = 0; + char_boundary = 0; + } + break; + case 1: + (*str->encode_char) (str, (ch << 6) | (c & 0x3f), dst, &flags); + ch =0; + char_boundary = 0; + break; + default: + ch = ( ch << 6 ) | ( c & 0x3f ); + char_boundary--; + } + } + + if ( (char_boundary == 0) && flags & CODING_STATE_END) + { + (*str->finish) (str, dst, &flags); + } + + str->flags = flags; + str->ch = ch; + str->iso2022.current_char_boundary = char_boundary; + str->iso2022.current_charset = charset; + str->iso2022.current_half = half; + + /* Verbum caro factum est! */ +} + + +/************************************************************************/ +/* Shift-JIS methods */ +/************************************************************************/ + +/* Shift-JIS is a coding system encoding three character sets: ASCII, right + half of JISX0201-Kana, and JISX0208. An ASCII character is encoded + as is. A character of JISX0201-Kana (DIMENSION1_CHARS94 character set) is + encoded by "position-code + 0x80". A character of JISX0208 + (DIMENSION2_CHARS94 character set) is encoded in 2-byte but two + position-codes are divided and shifted so that it fit in the range + below. + + --- CODE RANGE of Shift-JIS --- + (character set) (range) + ASCII 0x00 .. 0x7F + JISX0201-Kana 0xA0 .. 0xDF + JISX0208 (1st byte) 0x80 .. 0x9F and 0xE0 .. 0xEF + (2nd byte) 0x40 .. 0x7E and 0x80 .. 0xFC + ------------------------------- + +*/ + +/* Is this the first byte of a Shift-JIS two-byte char? */ + +#define BYTE_SJIS_TWO_BYTE_1_P(c) \ + (((c) >= 0x81 && (c) <= 0x9F) || ((c) >= 0xE0 && (c) <= 0xEF)) + +/* Is this the second byte of a Shift-JIS two-byte char? */ + +#define BYTE_SJIS_TWO_BYTE_2_P(c) \ + (((c) >= 0x40 && (c) <= 0x7E) || ((c) >= 0x80 && (c) <= 0xFC)) + +#define BYTE_SJIS_KATAKANA_P(c) \ + ((c) >= 0xA1 && (c) <= 0xDF) + +static int +detect_coding_sjis (struct detection_state *st, CONST unsigned char *src, + unsigned int n) +{ + int c; + + while (n--) + { + c = *src++; + if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO) + return 0; + if (st->shift_jis.in_second_byte) + { + st->shift_jis.in_second_byte = 0; + if (c < 0x40) + return 0; + } + else if ((c >= 0x80 && c < 0xA0) || c >= 0xE0) + st->shift_jis.in_second_byte = 1; + } + return CODING_CATEGORY_SHIFT_JIS_MASK; +} + +/* Convert Shift-JIS data to internal format. */ + +static void +decode_coding_sjis (Lstream *decoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + unsigned char c; + struct decoding_stream *str = DECODING_STREAM_DATA (decoding); + unsigned int flags = str->flags; + unsigned int ch = str->ch; + eol_type_t eol_type = str->eol_type; + + while (n--) + { + c = *src++; + + if (ch) + { + /* Previous character was first byte of Shift-JIS Kanji char. */ + if (BYTE_SJIS_TWO_BYTE_2_P (c)) + { + unsigned char e1, e2; + + DECODE_SJIS (ch, c, e1, e2); +#ifdef UTF2000 + DECODE_ADD_UCS_CHAR(MAKE_CHAR(Vcharset_japanese_jisx0208, + e1 & 0x7F, + e2 & 0x7F), dst); +#else + Dynarr_add (dst, LEADING_BYTE_JAPANESE_JISX0208); + Dynarr_add (dst, e1); + Dynarr_add (dst, e2); +#endif + } + else + { + DECODE_ADD_BINARY_CHAR (ch, dst); + DECODE_ADD_BINARY_CHAR (c, dst); + } + ch = 0; + } + else + { + DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst); + if (BYTE_SJIS_TWO_BYTE_1_P (c)) + ch = c; + else if (BYTE_SJIS_KATAKANA_P (c)) + { +#ifdef UTF2000 + DECODE_ADD_UCS_CHAR(MAKE_CHAR(Vcharset_katakana_jisx0201, + c & 0x7F, 0), dst); +#else + Dynarr_add (dst, LEADING_BYTE_KATAKANA_JISX0201); + Dynarr_add (dst, c); +#endif + } + else + DECODE_ADD_BINARY_CHAR (c, dst); + } + label_continue_loop:; + } + + DECODE_HANDLE_END_OF_CONVERSION (flags, ch, dst); + + str->flags = flags; + str->ch = ch; +} + +/* Convert internally-formatted data to Shift-JIS. */ + +static void +encode_coding_sjis (Lstream *encoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + unsigned char c; + struct encoding_stream *str = ENCODING_STREAM_DATA (encoding); + unsigned int flags = str->flags; + unsigned int ch = str->ch; + eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE (str->codesys); +#ifdef UTF2000 + unsigned char char_boundary = str->iso2022.current_char_boundary; +#endif + + while (n--) + { + c = *src++; +#ifdef UTF2000 + switch (char_boundary) + { + case 0: + if ( c >= 0xfc ) + { + ch = c & 0x01; + char_boundary = 5; + } + else if ( c >= 0xf8 ) + { + ch = c & 0x03; + char_boundary = 4; + } + else if ( c >= 0xf0 ) + { + ch = c & 0x07; + char_boundary = 3; + } + else if ( c >= 0xe0 ) + { + ch = c & 0x0f; + char_boundary = 2; + } + else if ( c >= 0xc0 ) + { + ch = c & 0x1f; + char_boundary = 1; + } + else + { + ch = 0; + if (c == '\n') + { + if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT) + Dynarr_add (dst, '\r'); + if (eol_type != EOL_CR) + Dynarr_add (dst, c); + } + else + Dynarr_add (dst, c); + char_boundary = 0; + } + break; + case 1: + ch = ( ch << 6 ) | ( c & 0x3f ); + { + Lisp_Object charset; + unsigned int c1, c2, s1, s2; + + BREAKUP_CHAR (ch, charset, c1, c2); + if (EQ(charset, Vcharset_katakana_jisx0201)) + { + Dynarr_add (dst, c1 | 0x80); + } + else if (EQ(charset, Vcharset_japanese_jisx0208)) + { + ENCODE_SJIS (c1 | 0x80, c2 | 0x80, s1, s2); + Dynarr_add (dst, s1); + Dynarr_add (dst, s2); + } + } + char_boundary = 0; + break; + default: + ch = ( ch << 6 ) | ( c & 0x3f ); + char_boundary--; + } +#else + if (c == '\n') + { + if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT) + Dynarr_add (dst, '\r'); + if (eol_type != EOL_CR) + Dynarr_add (dst, '\n'); + ch = 0; + } + else if (BYTE_ASCII_P (c)) + { + Dynarr_add (dst, c); + ch = 0; + } + else if (BUFBYTE_LEADING_BYTE_P (c)) + ch = (c == LEADING_BYTE_KATAKANA_JISX0201 || + c == LEADING_BYTE_JAPANESE_JISX0208_1978 || + c == LEADING_BYTE_JAPANESE_JISX0208) ? c : 0; + else if (ch) + { + if (ch == LEADING_BYTE_KATAKANA_JISX0201) + { + Dynarr_add (dst, c); + ch = 0; + } + else if (ch == LEADING_BYTE_JAPANESE_JISX0208_1978 || + ch == LEADING_BYTE_JAPANESE_JISX0208) + ch = c; + else + { + unsigned char j1, j2; + ENCODE_SJIS (ch, c, j1, j2); + Dynarr_add (dst, j1); + Dynarr_add (dst, j2); + ch = 0; + } + } +#endif + } + + str->flags = flags; + str->ch = ch; +#ifdef UTF2000 + str->iso2022.current_char_boundary = char_boundary; +#endif +} + +DEFUN ("decode-shift-jis-char", Fdecode_shift_jis_char, 1, 1, 0, /* +Decode a JISX0208 character of Shift-JIS coding-system. +CODE is the character code in Shift-JIS as a cons of type bytes. +Return the corresponding character. +*/ + (code)) +{ + unsigned char c1, c2, s1, s2; + + CHECK_CONS (code); + CHECK_INT (XCAR (code)); + CHECK_INT (XCDR (code)); + s1 = XINT (XCAR (code)); + s2 = XINT (XCDR (code)); + if (BYTE_SJIS_TWO_BYTE_1_P (s1) && + BYTE_SJIS_TWO_BYTE_2_P (s2)) + { + DECODE_SJIS (s1, s2, c1, c2); + return make_char (MAKE_CHAR (Vcharset_japanese_jisx0208, + c1 & 0x7F, c2 & 0x7F)); + } + else + return Qnil; +} + +DEFUN ("encode-shift-jis-char", Fencode_shift_jis_char, 1, 1, 0, /* +Encode a JISX0208 character CHAR to SHIFT-JIS coding-system. +Return the corresponding character code in SHIFT-JIS as a cons of two bytes. +*/ + (ch)) +{ + Lisp_Object charset; + int c1, c2, s1, s2; + + CHECK_CHAR_COERCE_INT (ch); + BREAKUP_CHAR (XCHAR (ch), charset, c1, c2); + if (EQ (charset, Vcharset_japanese_jisx0208)) + { + ENCODE_SJIS (c1 | 0x80, c2 | 0x80, s1, s2); + return Fcons (make_int (s1), make_int (s2)); + } + else + return Qnil; +} + + +/************************************************************************/ +/* Big5 methods */ +/************************************************************************/ + +/* BIG5 is a coding system encoding two character sets: ASCII and + Big5. An ASCII character is encoded as is. Big5 is a two-byte + character set and is encoded in two-byte. + + --- CODE RANGE of BIG5 --- + (character set) (range) + ASCII 0x00 .. 0x7F + Big5 (1st byte) 0xA1 .. 0xFE + (2nd byte) 0x40 .. 0x7E and 0xA1 .. 0xFE + -------------------------- + + Since the number of characters in Big5 is larger than maximum + characters in Emacs' charset (96x96), it can't be handled as one + charset. So, in Emacs, Big5 is divided into two: `charset-big5-1' + and `charset-big5-2'. Both s are DIMENSION2_CHARS94. The former + contains frequently used characters and the latter contains less + frequently used characters. */ + +#define BYTE_BIG5_TWO_BYTE_1_P(c) \ + ((c) >= 0xA1 && (c) <= 0xFE) + +/* Is this the second byte of a Shift-JIS two-byte char? */ + +#define BYTE_BIG5_TWO_BYTE_2_P(c) \ + (((c) >= 0x40 && (c) <= 0x7E) || ((c) >= 0xA1 && (c) <= 0xFE)) + +/* Number of Big5 characters which have the same code in 1st byte. */ + +#define BIG5_SAME_ROW (0xFF - 0xA1 + 0x7F - 0x40) + +/* Code conversion macros. These are macros because they are used in + inner loops during code conversion. + + Note that temporary variables in macros introduce the classic + dynamic-scoping problems with variable names. We use capital- + lettered variables in the assumption that XEmacs does not use + capital letters in variables except in a very formalized way + (e.g. Qstring). */ + +/* Convert Big5 code (b1, b2) into its internal string representation + (lb, c1, c2). */ + +/* There is a much simpler way to split the Big5 charset into two. + For the moment I'm going to leave the algorithm as-is because it + claims to separate out the most-used characters into a single + charset, which perhaps will lead to optimizations in various + places. + + The way the algorithm works is something like this: + + Big5 can be viewed as a 94x157 charset, where the row is + encoded into the bytes 0xA1 .. 0xFE and the column is encoded + into the bytes 0x40 .. 0x7E and 0xA1 .. 0xFE. As for frequency, + the split between low and high column numbers is apparently + meaningless; ascending rows produce less and less frequent chars. + Therefore, we assign the lower half of rows (0xA1 .. 0xC8) to + the first charset, and the upper half (0xC9 .. 0xFE) to the + second. To do the conversion, we convert the character into + a single number where 0 .. 156 is the first row, 157 .. 313 + is the second, etc. That way, the characters are ordered by + decreasing frequency. Then we just chop the space in two + and coerce the result into a 94x94 space. + */ + +#define DECODE_BIG5(b1, b2, lb, c1, c2) do \ +{ \ + int B1 = b1, B2 = b2; \ + unsigned int I \ + = (B1 - 0xA1) * BIG5_SAME_ROW + B2 - (B2 < 0x7F ? 0x40 : 0x62); \ + \ + if (B1 < 0xC9) \ + { \ + lb = LEADING_BYTE_CHINESE_BIG5_1; \ + } \ + else \ + { \ + lb = LEADING_BYTE_CHINESE_BIG5_2; \ + I -= (BIG5_SAME_ROW) * (0xC9 - 0xA1); \ + } \ + c1 = I / (0xFF - 0xA1) + 0xA1; \ + c2 = I % (0xFF - 0xA1) + 0xA1; \ +} while (0) + +/* Convert the internal string representation of a Big5 character + (lb, c1, c2) into Big5 code (b1, b2). */ + +#define ENCODE_BIG5(lb, c1, c2, b1, b2) do \ +{ \ + unsigned int I = ((c1) - 0xA1) * (0xFF - 0xA1) + ((c2) - 0xA1); \ + \ + if (lb == LEADING_BYTE_CHINESE_BIG5_2) \ + { \ + I += BIG5_SAME_ROW * (0xC9 - 0xA1); \ + } \ + b1 = I / BIG5_SAME_ROW + 0xA1; \ + b2 = I % BIG5_SAME_ROW; \ + b2 += b2 < 0x3F ? 0x40 : 0x62; \ +} while (0) + +static int +detect_coding_big5 (struct detection_state *st, CONST unsigned char *src, + unsigned int n) +{ + int c; + + while (n--) + { + c = *src++; + if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO || + (c >= 0x80 && c <= 0xA0)) + return 0; + if (st->big5.in_second_byte) + { + st->big5.in_second_byte = 0; + if (c < 0x40 || (c >= 0x80 && c <= 0xA0)) + return 0; + } + else if (c >= 0xA1) + st->big5.in_second_byte = 1; + } + return CODING_CATEGORY_BIG5_MASK; +} + +/* Convert Big5 data to internal format. */ + +static void +decode_coding_big5 (Lstream *decoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + unsigned char c; + struct decoding_stream *str = DECODING_STREAM_DATA (decoding); + unsigned int flags = str->flags; + unsigned int ch = str->ch; + eol_type_t eol_type = str->eol_type; + + while (n--) + { + c = *src++; + if (ch) + { + /* Previous character was first byte of Big5 char. */ + if (BYTE_BIG5_TWO_BYTE_2_P (c)) + { + unsigned char b1, b2, b3; + DECODE_BIG5 (ch, c, b1, b2, b3); + Dynarr_add (dst, b1); + Dynarr_add (dst, b2); + Dynarr_add (dst, b3); + } + else + { + DECODE_ADD_BINARY_CHAR (ch, dst); + DECODE_ADD_BINARY_CHAR (c, dst); + } + ch = 0; + } + else + { + DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst); + if (BYTE_BIG5_TWO_BYTE_1_P (c)) + ch = c; + else + DECODE_ADD_BINARY_CHAR (c, dst); + } + label_continue_loop:; + } + + DECODE_HANDLE_END_OF_CONVERSION (flags, ch, dst); + + str->flags = flags; + str->ch = ch; +} + +/* Convert internally-formatted data to Big5. */ + +static void +encode_coding_big5 (Lstream *encoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ +#ifndef UTF2000 + unsigned char c; + struct encoding_stream *str = ENCODING_STREAM_DATA (encoding); + unsigned int flags = str->flags; + unsigned int ch = str->ch; + eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE (str->codesys); + + while (n--) + { + c = *src++; + if (c == '\n') + { + if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT) + Dynarr_add (dst, '\r'); + if (eol_type != EOL_CR) + Dynarr_add (dst, '\n'); + } + else if (BYTE_ASCII_P (c)) + { + /* ASCII. */ + Dynarr_add (dst, c); + } + else if (BUFBYTE_LEADING_BYTE_P (c)) + { + if (c == LEADING_BYTE_CHINESE_BIG5_1 || + c == LEADING_BYTE_CHINESE_BIG5_2) + { + /* A recognized leading byte. */ + ch = c; + continue; /* not done with this character. */ + } + /* otherwise just ignore this character. */ + } + else if (ch == LEADING_BYTE_CHINESE_BIG5_1 || + ch == LEADING_BYTE_CHINESE_BIG5_2) + { + /* Previous char was a recognized leading byte. */ + ch = (ch << 8) | c; + continue; /* not done with this character. */ + } + else if (ch) + { + /* Encountering second byte of a Big5 character. */ + unsigned char b1, b2; + + ENCODE_BIG5 (ch >> 8, ch & 0xFF, c, b1, b2); + Dynarr_add (dst, b1); + Dynarr_add (dst, b2); + } + + ch = 0; + } + + str->flags = flags; + str->ch = ch; +#endif +} + + +DEFUN ("decode-big5-char", Fdecode_big5_char, 1, 1, 0, /* +Decode a Big5 character CODE of BIG5 coding-system. +CODE is the character code in BIG5, a cons of two integers. +Return the corresponding character. +*/ + (code)) +{ + unsigned char c1, c2, b1, b2; + + CHECK_CONS (code); + CHECK_INT (XCAR (code)); + CHECK_INT (XCDR (code)); + b1 = XINT (XCAR (code)); + b2 = XINT (XCDR (code)); + if (BYTE_BIG5_TWO_BYTE_1_P (b1) && + BYTE_BIG5_TWO_BYTE_2_P (b2)) + { + Charset_ID leading_byte; + Lisp_Object charset; + DECODE_BIG5 (b1, b2, leading_byte, c1, c2); + charset = CHARSET_BY_LEADING_BYTE (leading_byte); + return make_char (MAKE_CHAR (charset, c1 & 0x7F, c2 & 0x7F)); + } + else + return Qnil; +} + +DEFUN ("encode-big5-char", Fencode_big5_char, 1, 1, 0, /* +Encode the Big5 character CH to BIG5 coding-system. +Return the corresponding character code in Big5. +*/ + (ch)) +{ + Lisp_Object charset; + int c1, c2, b1, b2; + + CHECK_CHAR_COERCE_INT (ch); + BREAKUP_CHAR (XCHAR (ch), charset, c1, c2); + if (EQ (charset, Vcharset_chinese_big5_1) || + EQ (charset, Vcharset_chinese_big5_2)) + { + ENCODE_BIG5 (XCHARSET_LEADING_BYTE (charset), c1 | 0x80, c2 | 0x80, + b1, b2); + return Fcons (make_int (b1), make_int (b2)); + } + else + return Qnil; +} + + +/************************************************************************/ +/* UCS-4 methods */ +/* */ +/* UCS-4 character codes are implemented as nonnegative integers. */ +/* */ +/************************************************************************/ + +Lisp_Object ucs_to_mule_table[65536]; +Lisp_Object mule_to_ucs_table; + +DEFUN ("set-ucs-char", Fset_ucs_char, 2, 2, 0, /* +Map UCS-4 code CODE to Mule character CHARACTER. + +Return T on success, NIL on failure. +*/ + (code, character)) +{ + unsigned int c; + + CHECK_CHAR (character); + CHECK_INT (code); + c = XINT (code); + + if (c < sizeof (ucs_to_mule_table)) + { + ucs_to_mule_table[c] = character; + return Qt; + } + else + return Qnil; +} + +static Lisp_Object +ucs_to_char (unsigned long code) +{ + if (code < sizeof (ucs_to_mule_table)) + { + return ucs_to_mule_table[code]; + } + else if ((0xe00000 <= code) && (code <= 0xe00000 + 94 * 94 * 14)) + { + unsigned int c; + + code -= 0xe00000; + c = code % (94 * 94); + return make_char + (MAKE_CHAR (CHARSET_BY_ATTRIBUTES + (CHARSET_TYPE_94X94, code / (94 * 94) + '@', + CHARSET_LEFT_TO_RIGHT), + c / 94 + 33, c % 94 + 33)); + } + else + return Qnil; +} + +DEFUN ("ucs-char", Fucs_char, 1, 1, 0, /* +Return Mule character corresponding to UCS code CODE (a positive integer). +*/ + (code)) +{ + CHECK_NATNUM (code); + return ucs_to_char (XINT (code)); +} + +DEFUN ("set-char-ucs", Fset_char_ucs, 2, 2, 0, /* +Map Mule character CHARACTER to UCS code CODE (a positive integer). +*/ + (character, code)) +{ + /* #### Isn't this gilding the lily? Fput_char_table checks its args. + Fset_char_ucs is more restrictive on index arg, but should + check code arg in a char_table method. */ + CHECK_CHAR (character); + CHECK_NATNUM (code); + return Fput_char_table (character, code, mule_to_ucs_table); +} + +DEFUN ("char-ucs", Fchar_ucs, 1, 1, 0, /* +Return the UCS code (a positive integer) corresponding to CHARACTER. +*/ + (character)) +{ + return Fget_char_table (character, mule_to_ucs_table); +} + +#ifdef UTF2000 +#define decode_ucs4 DECODE_ADD_UCS_CHAR +#else +/* Decode a UCS-4 character into a buffer. If the lookup fails, use + (U+3013) of JIS X 0208, which means correct character + is not found, instead. + #### do something more appropriate (use blob?) + Danger, Will Robinson! Data loss. Should we signal user? */ +static void +decode_ucs4 (unsigned long ch, unsigned_char_dynarr *dst) +{ + Lisp_Object chr = ucs_to_char (ch); + + if (! NILP (chr)) + { + Bufbyte work[MAX_EMCHAR_LEN]; + int len; + + ch = XCHAR (chr); + len = (ch < 128) ? + simple_set_charptr_emchar (work, ch) : + non_ascii_set_charptr_emchar (work, ch); + Dynarr_add_many (dst, work, len); + } + else + { + Dynarr_add (dst, LEADING_BYTE_JAPANESE_JISX0208); + Dynarr_add (dst, 34 + 128); + Dynarr_add (dst, 46 + 128); + } +} +#endif + +static unsigned long +mule_char_to_ucs4 (Lisp_Object charset, + unsigned char h, unsigned char l) +{ + Lisp_Object code + = Fget_char_table (make_char (MAKE_CHAR (charset, h & 127, l & 127)), + mule_to_ucs_table); + + if (INTP (code)) + { + return XINT (code); + } + else if ( (XCHARSET_DIMENSION (charset) == 2) && + (XCHARSET_CHARS (charset) == 94) ) + { + unsigned char final = XCHARSET_FINAL (charset); + + if ( ('@' <= final) && (final < 0x7f) ) + { + return 0xe00000 + (final - '@') * 94 * 94 + + ((h & 127) - 33) * 94 + (l & 127) - 33; + } + else + { + return '?'; + } + } + else + { + return '?'; + } +} + +static void +encode_ucs4 (Lisp_Object charset, + unsigned char h, unsigned char l, unsigned_char_dynarr *dst) +{ + unsigned long code = mule_char_to_ucs4 (charset, h, l); + Dynarr_add (dst, code >> 24); + Dynarr_add (dst, (code >> 16) & 255); + Dynarr_add (dst, (code >> 8) & 255); + Dynarr_add (dst, code & 255); +} + +static int +detect_coding_ucs4 (struct detection_state *st, CONST unsigned char *src, + unsigned int n) +{ + while (n--) + { + int c = *src++; + switch (st->ucs4.in_byte) + { + case 0: + if (c >= 128) + return 0; + else + st->ucs4.in_byte++; + break; + case 3: + st->ucs4.in_byte = 0; + break; + default: + st->ucs4.in_byte++; + } + } + return CODING_CATEGORY_UCS4_MASK; +} + +static void +decode_coding_ucs4 (Lstream *decoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + struct decoding_stream *str = DECODING_STREAM_DATA (decoding); + unsigned int flags = str->flags; + unsigned int ch = str->ch; + unsigned char counter = str->counter; + + while (n--) + { + unsigned char c = *src++; + switch (counter) + { + case 0: + ch = c; + counter = 3; + break; + case 1: + decode_ucs4 ( ( ch << 8 ) | c, dst); + ch = 0; + counter = 0; + break; + default: + ch = ( ch << 8 ) | c; + counter--; + } + } + if (counter & CODING_STATE_END) + DECODE_OUTPUT_PARTIAL_CHAR (ch); + + str->flags = flags; + str->ch = ch; + str->counter = counter; +} + +static void +encode_coding_ucs4 (Lstream *encoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ +#ifndef UTF2000 + struct encoding_stream *str = ENCODING_STREAM_DATA (encoding); + unsigned int flags = str->flags; + unsigned int ch = str->ch; + unsigned char char_boundary = str->iso2022.current_char_boundary; + Lisp_Object charset = str->iso2022.current_charset; + +#ifdef ENABLE_COMPOSITE_CHARS + /* flags for handling composite chars. We do a little switcharoo + on the source while we're outputting the composite char. */ + unsigned int saved_n = 0; + CONST unsigned char *saved_src = NULL; + int in_composite = 0; + + back_to_square_n: +#endif + + while (n--) + { + unsigned char c = *src++; + + if (BYTE_ASCII_P (c)) + { /* Processing ASCII character */ + ch = 0; + encode_ucs4 (Vcharset_ascii, c, 0, dst); + char_boundary = 1; + } + else if (BUFBYTE_LEADING_BYTE_P (c) || BUFBYTE_LEADING_BYTE_P (ch)) + { /* Processing Leading Byte */ + ch = 0; + charset = CHARSET_BY_LEADING_BYTE (c); + if (LEADING_BYTE_PREFIX_P(c)) + ch = c; + char_boundary = 0; + } + else + { /* Processing Non-ASCII character */ + char_boundary = 1; + if (EQ (charset, Vcharset_control_1)) + { + encode_ucs4 (Vcharset_control_1, c, 0, dst); + } + else + { + switch (XCHARSET_REP_BYTES (charset)) + { + case 2: + encode_ucs4 (charset, c, 0, dst); + break; + case 3: + if (XCHARSET_PRIVATE_P (charset)) + { + encode_ucs4 (charset, c, 0, dst); + ch = 0; + } + else if (ch) + { +#ifdef ENABLE_COMPOSITE_CHARS + if (EQ (charset, Vcharset_composite)) + { + if (in_composite) + { + /* #### Bother! We don't know how to + handle this yet. */ + Dynarr_add (dst, 0); + Dynarr_add (dst, 0); + Dynarr_add (dst, 0); + Dynarr_add (dst, '~'); + } + else + { + Emchar emch = MAKE_CHAR (Vcharset_composite, + ch & 0x7F, c & 0x7F); + Lisp_Object lstr = composite_char_string (emch); + saved_n = n; + saved_src = src; + in_composite = 1; + src = XSTRING_DATA (lstr); + n = XSTRING_LENGTH (lstr); + } + } + else +#endif /* ENABLE_COMPOSITE_CHARS */ + { + encode_ucs4(charset, ch, c, dst); + } + ch = 0; + } + else + { + ch = c; + char_boundary = 0; + } + break; + case 4: + if (ch) + { + encode_ucs4 (charset, ch, c, dst); + ch = 0; + } + else + { + ch = c; + char_boundary = 0; + } + break; + default: + abort (); + } + } + } + } + +#ifdef ENABLE_COMPOSITE_CHARS + if (in_composite) + { + n = saved_n; + src = saved_src; + in_composite = 0; + goto back_to_square_n; /* Wheeeeeeeee ..... */ + } +#endif /* ENABLE_COMPOSITE_CHARS */ + + str->flags = flags; + str->ch = ch; + str->iso2022.current_char_boundary = char_boundary; + str->iso2022.current_charset = charset; + + /* Verbum caro factum est! */ +#endif +} + + +/************************************************************************/ +/* UTF-8 methods */ +/************************************************************************/ + +static int +detect_coding_utf8 (struct detection_state *st, CONST unsigned char *src, + unsigned int n) +{ + while (n--) + { + unsigned char c = *src++; + switch (st->utf8.in_byte) + { + case 0: + if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO) + return 0; + else if (c >= 0xfc) + st->utf8.in_byte = 5; + else if (c >= 0xf8) + st->utf8.in_byte = 4; + else if (c >= 0xf0) + st->utf8.in_byte = 3; + else if (c >= 0xe0) + st->utf8.in_byte = 2; + else if (c >= 0xc0) + st->utf8.in_byte = 1; + else if (c >= 0x80) + return 0; + break; + default: + if ((c & 0xc0) != 0x80) + return 0; + else + st->utf8.in_byte--; + } + } + return CODING_CATEGORY_UTF8_MASK; +} + +static void +decode_coding_utf8 (Lstream *decoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + struct decoding_stream *str = DECODING_STREAM_DATA (decoding); + unsigned int flags = str->flags; + unsigned int ch = str->ch; + eol_type_t eol_type = str->eol_type; + unsigned char counter = str->counter; + + while (n--) + { + unsigned char c = *src++; + switch (counter) + { + case 0: + if ( c >= 0xfc ) + { + ch = c & 0x01; + counter = 5; + } + else if ( c >= 0xf8 ) + { + ch = c & 0x03; + counter = 4; + } + else if ( c >= 0xf0 ) + { + ch = c & 0x07; + counter = 3; + } + else if ( c >= 0xe0 ) + { + ch = c & 0x0f; + counter = 2; + } + else if ( c >= 0xc0 ) + { + ch = c & 0x1f; + counter = 1; + } + else + { + DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst); + decode_ucs4 (c, dst); + } + break; + case 1: + ch = ( ch << 6 ) | ( c & 0x3f ); + decode_ucs4 (ch, dst); + ch = 0; + counter = 0; + break; + default: + ch = ( ch << 6 ) | ( c & 0x3f ); + counter--; + } + label_continue_loop:; + } + + if (flags & CODING_STATE_END) + DECODE_OUTPUT_PARTIAL_CHAR (ch); + + str->flags = flags; + str->ch = ch; + str->counter = counter; +} + +void +char_encode_utf8 (struct encoding_stream *str, Emchar code, + unsigned_char_dynarr *dst, unsigned int *flags) +{ + if ( code <= 0x7f ) + { + Dynarr_add (dst, code); + } + else if ( code <= 0x7ff ) + { + Dynarr_add (dst, (code >> 6) | 0xc0); + Dynarr_add (dst, (code & 0x3f) | 0x80); + } + else if ( code <= 0xffff ) + { + Dynarr_add (dst, (code >> 12) | 0xe0); + Dynarr_add (dst, ((code >> 6) & 0x3f) | 0x80); + Dynarr_add (dst, (code & 0x3f) | 0x80); + } + else if ( code <= 0x1fffff ) + { + Dynarr_add (dst, (code >> 18) | 0xf0); + Dynarr_add (dst, ((code >> 12) & 0x3f) | 0x80); + Dynarr_add (dst, ((code >> 6) & 0x3f) | 0x80); + Dynarr_add (dst, (code & 0x3f) | 0x80); + } + else if ( code <= 0x3ffffff ) + { + Dynarr_add (dst, (code >> 24) | 0xf8); + Dynarr_add (dst, ((code >> 18) & 0x3f) | 0x80); + Dynarr_add (dst, ((code >> 12) & 0x3f) | 0x80); + Dynarr_add (dst, ((code >> 6) & 0x3f) | 0x80); + Dynarr_add (dst, (code & 0x3f) | 0x80); + } + else + { + Dynarr_add (dst, (code >> 30) | 0xfc); + Dynarr_add (dst, ((code >> 24) & 0x3f) | 0x80); + Dynarr_add (dst, ((code >> 18) & 0x3f) | 0x80); + Dynarr_add (dst, ((code >> 12) & 0x3f) | 0x80); + Dynarr_add (dst, ((code >> 6) & 0x3f) | 0x80); + Dynarr_add (dst, (code & 0x3f) | 0x80); + } +} + +void +char_finish_utf8 (struct encoding_stream *str, unsigned_char_dynarr *dst, + unsigned int *flags) +{ +} + + +/************************************************************************/ +/* ISO2022 methods */ +/************************************************************************/ + +/* The following note describes the coding system ISO2022 briefly. + Since the intention of this note is to help understand the + functions in this file, some parts are NOT ACCURATE or OVERLY + SIMPLIFIED. For thorough understanding, please refer to the + original document of ISO2022. + + ISO2022 provides many mechanisms to encode several character sets + in 7-bit and 8-bit environments. For 7-bit environments, all text + is encoded using bytes less than 128. This may make the encoded + text a little bit longer, but the text passes more easily through + several gateways, some of which strip off MSB (Most Signigant Bit). + + There are two kinds of character sets: control character set and + graphic character set. The former contains control characters such + as `newline' and `escape' to provide control functions (control + functions are also provided by escape sequences). The latter + contains graphic characters such as 'A' and '-'. Emacs recognizes + two control character sets and many graphic character sets. + + Graphic character sets are classified into one of the following + four classes, according to the number of bytes (DIMENSION) and + number of characters in one dimension (CHARS) of the set: + - DIMENSION1_CHARS94 + - DIMENSION1_CHARS96 + - DIMENSION2_CHARS94 + - DIMENSION2_CHARS96 + + In addition, each character set is assigned an identification tag, + unique for each set, called "final character" (denoted as + hereafter). The of each character set is decided by ECMA(*) + when it is registered in ISO. The code range of is 0x30..0x7F + (0x30..0x3F are for private use only). + + Note (*): ECMA = European Computer Manufacturers Association + + Here are examples of graphic character set [NAME()]: + o DIMENSION1_CHARS94 -- ASCII('B'), right-half-of-JISX0201('I'), ... + o DIMENSION1_CHARS96 -- right-half-of-ISO8859-1('A'), ... + o DIMENSION2_CHARS94 -- GB2312('A'), JISX0208('B'), ... + o DIMENSION2_CHARS96 -- none for the moment + + A code area (1 byte = 8 bits) is divided into 4 areas, C0, GL, C1, and GR. + C0 [0x00..0x1F] -- control character plane 0 + GL [0x20..0x7F] -- graphic character plane 0 + C1 [0x80..0x9F] -- control character plane 1 + GR [0xA0..0xFF] -- graphic character plane 1 + + A control character set is directly designated and invoked to C0 or + C1 by an escape sequence. The most common case is that: + - ISO646's control character set is designated/invoked to C0, and + - ISO6429's control character set is designated/invoked to C1, + and usually these designations/invocations are omitted in encoded + text. In a 7-bit environment, only C0 can be used, and a control + character for C1 is encoded by an appropriate escape sequence to + fit into the environment. All control characters for C1 are + defined to have corresponding escape sequences. + + A graphic character set is at first designated to one of four + graphic registers (G0 through G3), then these graphic registers are + invoked to GL or GR. These designations and invocations can be + done independently. The most common case is that G0 is invoked to + GL, G1 is invoked to GR, and ASCII is designated to G0. Usually + these invocations and designations are omitted in encoded text. + In a 7-bit environment, only GL can be used. + + When a graphic character set of CHARS94 is invoked to GL, codes + 0x20 and 0x7F of the GL area work as control characters SPACE and + DEL respectively, and codes 0xA0 and 0xFF of the GR area should not + be used. + + There are two ways of invocation: locking-shift and single-shift. + With locking-shift, the invocation lasts until the next different + invocation, whereas with single-shift, the invocation affects the + following character only and doesn't affect the locking-shift + state. Invocations are done by the following control characters or + escape sequences: + + ---------------------------------------------------------------------- + abbrev function cntrl escape seq description + ---------------------------------------------------------------------- + SI/LS0 (shift-in) 0x0F none invoke G0 into GL + SO/LS1 (shift-out) 0x0E none invoke G1 into GL + LS2 (locking-shift-2) none ESC 'n' invoke G2 into GL + LS3 (locking-shift-3) none ESC 'o' invoke G3 into GL + LS1R (locking-shift-1 right) none ESC '~' invoke G1 into GR (*) + LS2R (locking-shift-2 right) none ESC '}' invoke G2 into GR (*) + LS3R (locking-shift 3 right) none ESC '|' invoke G3 into GR (*) + SS2 (single-shift-2) 0x8E ESC 'N' invoke G2 for one char + SS3 (single-shift-3) 0x8F ESC 'O' invoke G3 for one char + ---------------------------------------------------------------------- + (*) These are not used by any known coding system. + + Control characters for these functions are defined by macros + ISO_CODE_XXX in `coding.h'. + + Designations are done by the following escape sequences: + ---------------------------------------------------------------------- + escape sequence description + ---------------------------------------------------------------------- + ESC '(' designate DIMENSION1_CHARS94 to G0 + ESC ')' designate DIMENSION1_CHARS94 to G1 + ESC '*' designate DIMENSION1_CHARS94 to G2 + ESC '+' designate DIMENSION1_CHARS94 to G3 + ESC ',' designate DIMENSION1_CHARS96 to G0 (*) + ESC '-' designate DIMENSION1_CHARS96 to G1 + ESC '.' designate DIMENSION1_CHARS96 to G2 + ESC '/' designate DIMENSION1_CHARS96 to G3 + ESC '$' '(' designate DIMENSION2_CHARS94 to G0 (**) + ESC '$' ')' designate DIMENSION2_CHARS94 to G1 + ESC '$' '*' designate DIMENSION2_CHARS94 to G2 + ESC '$' '+' designate DIMENSION2_CHARS94 to G3 + ESC '$' ',' designate DIMENSION2_CHARS96 to G0 (*) + ESC '$' '-' designate DIMENSION2_CHARS96 to G1 + ESC '$' '.' designate DIMENSION2_CHARS96 to G2 + ESC '$' '/' designate DIMENSION2_CHARS96 to G3 + ---------------------------------------------------------------------- + + In this list, "DIMENSION1_CHARS94" means a graphic character set + of dimension 1, chars 94, and final character , etc... + + Note (*): Although these designations are not allowed in ISO2022, + Emacs accepts them on decoding, and produces them on encoding + CHARS96 character sets in a coding system which is characterized as + 7-bit environment, non-locking-shift, and non-single-shift. + + Note (**): If is '@', 'A', or 'B', the intermediate character + '(' can be omitted. We refer to this as "short-form" hereafter. + + Now you may notice that there are a lot of ways for encoding the + same multilingual text in ISO2022. Actually, there exist many + coding systems such as Compound Text (used in X11's inter client + communication, ISO-2022-JP (used in Japanese internet), ISO-2022-KR + (used in Korean internet), EUC (Extended UNIX Code, used in Asian + localized platforms), and all of these are variants of ISO2022. + + In addition to the above, Emacs handles two more kinds of escape + sequences: ISO6429's direction specification and Emacs' private + sequence for specifying character composition. + + ISO6429's direction specification takes the following form: + o CSI ']' -- end of the current direction + o CSI '0' ']' -- end of the current direction + o CSI '1' ']' -- start of left-to-right text + o CSI '2' ']' -- start of right-to-left text + The control character CSI (0x9B: control sequence introducer) is + abbreviated to the escape sequence ESC '[' in a 7-bit environment. + + Character composition specification takes the following form: + o ESC '0' -- start character composition + o ESC '1' -- end character composition + Since these are not standard escape sequences of any ISO standard, + their use with these meanings is restricted to Emacs only. */ + +static void +reset_iso2022 (Lisp_Object coding_system, struct iso2022_decoder *iso) +{ + int i; + + for (i = 0; i < 4; i++) + { + if (!NILP (coding_system)) + iso->charset[i] = + XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (coding_system, i); + else + iso->charset[i] = Qt; + iso->invalid_designated[i] = 0; + } + iso->esc = ISO_ESC_NOTHING; + iso->esc_bytes_index = 0; + iso->register_left = 0; + iso->register_right = 1; + iso->switched_dir_and_no_valid_charset_yet = 0; + iso->invalid_switch_dir = 0; + iso->output_direction_sequence = 0; + iso->output_literally = 0; +#ifdef ENABLE_COMPOSITE_CHARS + if (iso->composite_chars) + Dynarr_reset (iso->composite_chars); +#endif +} + +static int +fit_to_be_escape_quoted (unsigned char c) +{ + switch (c) + { + case ISO_CODE_ESC: + case ISO_CODE_CSI: + case ISO_CODE_SS2: + case ISO_CODE_SS3: + case ISO_CODE_SO: + case ISO_CODE_SI: + return 1; + + default: + return 0; + } +} + +/* Parse one byte of an ISO2022 escape sequence. + If the result is an invalid escape sequence, return 0 and + do not change anything in STR. Otherwise, if the result is + an incomplete escape sequence, update ISO2022.ESC and + ISO2022.ESC_BYTES and return -1. Otherwise, update + all the state variables (but not ISO2022.ESC_BYTES) and + return 1. + + If CHECK_INVALID_CHARSETS is non-zero, check for designation + or invocation of an invalid character set and treat that as + an unrecognized escape sequence. */ + +static int +parse_iso2022_esc (Lisp_Object codesys, struct iso2022_decoder *iso, + unsigned char c, unsigned int *flags, + int check_invalid_charsets) +{ + /* (1) If we're at the end of a designation sequence, CS is the + charset being designated and REG is the register to designate + it to. + + (2) If we're at the end of a locking-shift sequence, REG is + the register to invoke and HALF (0 == left, 1 == right) is + the half to invoke it into. + + (3) If we're at the end of a single-shift sequence, REG is + the register to invoke. */ + Lisp_Object cs = Qnil; + int reg, half; + + /* NOTE: This code does goto's all over the fucking place. + The reason for this is that we're basically implementing + a state machine here, and hierarchical languages like C + don't really provide a clean way of doing this. */ + + if (! (*flags & CODING_STATE_ESCAPE)) + /* At beginning of escape sequence; we need to reset our + escape-state variables. */ + iso->esc = ISO_ESC_NOTHING; + + iso->output_literally = 0; + iso->output_direction_sequence = 0; + + switch (iso->esc) + { + case ISO_ESC_NOTHING: + iso->esc_bytes_index = 0; + switch (c) + { + case ISO_CODE_ESC: /* Start escape sequence */ + *flags |= CODING_STATE_ESCAPE; + iso->esc = ISO_ESC; + goto not_done; + + case ISO_CODE_CSI: /* ISO6429 (specifying directionality) */ + *flags |= CODING_STATE_ESCAPE; + iso->esc = ISO_ESC_5_11; + goto not_done; + + case ISO_CODE_SO: /* locking shift 1 */ + reg = 1; half = 0; + goto locking_shift; + case ISO_CODE_SI: /* locking shift 0 */ + reg = 0; half = 0; + goto locking_shift; + + case ISO_CODE_SS2: /* single shift */ + reg = 2; + goto single_shift; + case ISO_CODE_SS3: /* single shift */ + reg = 3; + goto single_shift; + + default: /* Other control characters */ + return 0; + } + + case ISO_ESC: + switch (c) + { + /**** single shift ****/ + + case 'N': /* single shift 2 */ + reg = 2; + goto single_shift; + case 'O': /* single shift 3 */ + reg = 3; + goto single_shift; + + /**** locking shift ****/ + + case '~': /* locking shift 1 right */ + reg = 1; half = 1; + goto locking_shift; + case 'n': /* locking shift 2 */ + reg = 2; half = 0; + goto locking_shift; + case '}': /* locking shift 2 right */ + reg = 2; half = 1; + goto locking_shift; + case 'o': /* locking shift 3 */ + reg = 3; half = 0; + goto locking_shift; + case '|': /* locking shift 3 right */ + reg = 3; half = 1; + goto locking_shift; + +#ifdef ENABLE_COMPOSITE_CHARS + /**** composite ****/ + + case '0': + iso->esc = ISO_ESC_START_COMPOSITE; + *flags = (*flags & CODING_STATE_ISO2022_LOCK) | + CODING_STATE_COMPOSITE; + return 1; + + case '1': + iso->esc = ISO_ESC_END_COMPOSITE; + *flags = (*flags & CODING_STATE_ISO2022_LOCK) & + ~CODING_STATE_COMPOSITE; + return 1; +#endif /* ENABLE_COMPOSITE_CHARS */ + + /**** directionality ****/ + + case '[': + iso->esc = ISO_ESC_5_11; + goto not_done; + + /**** designation ****/ + + case '$': /* multibyte charset prefix */ + iso->esc = ISO_ESC_2_4; + goto not_done; + + default: + if (0x28 <= c && c <= 0x2F) + { + iso->esc = (enum iso_esc_flag) (c - 0x28 + ISO_ESC_2_8); + goto not_done; + } + + /* This function is called with CODESYS equal to nil when + doing coding-system detection. */ + if (!NILP (codesys) + && XCODING_SYSTEM_ISO2022_ESCAPE_QUOTED (codesys) + && fit_to_be_escape_quoted (c)) + { + iso->esc = ISO_ESC_LITERAL; + *flags &= CODING_STATE_ISO2022_LOCK; + return 1; + } + + /* bzzzt! */ + return 0; + } + + + + /**** directionality ****/ + + case ISO_ESC_5_11: /* ISO6429 direction control */ + if (c == ']') + { + *flags &= (CODING_STATE_ISO2022_LOCK & ~CODING_STATE_R2L); + goto directionality; + } + if (c == '0') iso->esc = ISO_ESC_5_11_0; + else if (c == '1') iso->esc = ISO_ESC_5_11_1; + else if (c == '2') iso->esc = ISO_ESC_5_11_2; + else return 0; + goto not_done; + + case ISO_ESC_5_11_0: + if (c == ']') + { + *flags &= (CODING_STATE_ISO2022_LOCK & ~CODING_STATE_R2L); + goto directionality; + } + return 0; + + case ISO_ESC_5_11_1: + if (c == ']') + { + *flags = (CODING_STATE_ISO2022_LOCK & ~CODING_STATE_R2L); + goto directionality; + } + return 0; + + case ISO_ESC_5_11_2: + if (c == ']') + { + *flags = (*flags & CODING_STATE_ISO2022_LOCK) | CODING_STATE_R2L; + goto directionality; + } + return 0; + + directionality: + iso->esc = ISO_ESC_DIRECTIONALITY; + /* Various junk here to attempt to preserve the direction sequences + literally in the text if they would otherwise be swallowed due + to invalid designations that don't show up as actual charset + changes in the text. */ + if (iso->invalid_switch_dir) + { + /* We already inserted a direction switch literally into the + text. We assume (#### this may not be right) that the + next direction switch is the one going the other way, + and we need to output that literally as well. */ + iso->output_literally = 1; + iso->invalid_switch_dir = 0; + } + else + { + int jj; + + /* If we are in the thrall of an invalid designation, + then stick the directionality sequence literally into the + output stream so it ends up in the original text again. */ + for (jj = 0; jj < 4; jj++) + if (iso->invalid_designated[jj]) + break; + if (jj < 4) + { + iso->output_literally = 1; + iso->invalid_switch_dir = 1; + } + else + /* Indicate that we haven't yet seen a valid designation, + so that if a switch-dir is directly followed by an + invalid designation, both get inserted literally. */ + iso->switched_dir_and_no_valid_charset_yet = 1; + } + return 1; + + + /**** designation ****/ + + case ISO_ESC_2_4: + if (0x28 <= c && c <= 0x2F) + { + iso->esc = (enum iso_esc_flag) (c - 0x28 + ISO_ESC_2_4_8); + goto not_done; + } + if (0x40 <= c && c <= 0x42) + { + cs = CHARSET_BY_ATTRIBUTES (CHARSET_TYPE_94X94, c, + *flags & CODING_STATE_R2L ? + CHARSET_RIGHT_TO_LEFT : + CHARSET_LEFT_TO_RIGHT); + reg = 0; + goto designated; + } + return 0; + + default: + { + int type =-1; + + if (c < '0' || c > '~') + return 0; /* bad final byte */ + + if (iso->esc >= ISO_ESC_2_8 && + iso->esc <= ISO_ESC_2_15) + { + type = ((iso->esc >= ISO_ESC_2_12) ? + CHARSET_TYPE_96 : CHARSET_TYPE_94); + reg = (iso->esc - ISO_ESC_2_8) & 3; + } + else if (iso->esc >= ISO_ESC_2_4_8 && + iso->esc <= ISO_ESC_2_4_15) + { + type = ((iso->esc >= ISO_ESC_2_4_12) ? + CHARSET_TYPE_96X96 : CHARSET_TYPE_94X94); + reg = (iso->esc - ISO_ESC_2_4_8) & 3; + } + else + { + /* Can this ever be reached? -slb */ + abort(); + } + + cs = CHARSET_BY_ATTRIBUTES (type, c, + *flags & CODING_STATE_R2L ? + CHARSET_RIGHT_TO_LEFT : + CHARSET_LEFT_TO_RIGHT); + goto designated; + } + } + + not_done: + iso->esc_bytes[iso->esc_bytes_index++] = (unsigned char) c; + return -1; + + single_shift: + if (check_invalid_charsets && !CHARSETP (iso->charset[reg])) + /* can't invoke something that ain't there. */ + return 0; + iso->esc = ISO_ESC_SINGLE_SHIFT; + *flags &= CODING_STATE_ISO2022_LOCK; + if (reg == 2) + *flags |= CODING_STATE_SS2; + else + *flags |= CODING_STATE_SS3; + return 1; + + locking_shift: + if (check_invalid_charsets && + !CHARSETP (iso->charset[reg])) + /* can't invoke something that ain't there. */ + return 0; + if (half) + iso->register_right = reg; + else + iso->register_left = reg; + *flags &= CODING_STATE_ISO2022_LOCK; + iso->esc = ISO_ESC_LOCKING_SHIFT; + return 1; + + designated: + if (NILP (cs) && check_invalid_charsets) + { + iso->invalid_designated[reg] = 1; + iso->charset[reg] = Vcharset_ascii; + iso->esc = ISO_ESC_DESIGNATE; + *flags &= CODING_STATE_ISO2022_LOCK; + iso->output_literally = 1; + if (iso->switched_dir_and_no_valid_charset_yet) + { + /* We encountered a switch-direction followed by an + invalid designation. Ensure that the switch-direction + gets outputted; otherwise it will probably get eaten + when the text is written out again. */ + iso->switched_dir_and_no_valid_charset_yet = 0; + iso->output_direction_sequence = 1; + /* And make sure that the switch-dir going the other + way gets outputted, as well. */ + iso->invalid_switch_dir = 1; + } + return 1; + } + /* This function is called with CODESYS equal to nil when + doing coding-system detection. */ + if (!NILP (codesys)) + { + charset_conversion_spec_dynarr *dyn = + XCODING_SYSTEM (codesys)->iso2022.input_conv; + + if (dyn) + { + int i; + + for (i = 0; i < Dynarr_length (dyn); i++) + { + struct charset_conversion_spec *spec = Dynarr_atp (dyn, i); + if (EQ (cs, spec->from_charset)) + cs = spec->to_charset; + } + } + } + + iso->charset[reg] = cs; + iso->esc = ISO_ESC_DESIGNATE; + *flags &= CODING_STATE_ISO2022_LOCK; + if (iso->invalid_designated[reg]) + { + iso->invalid_designated[reg] = 0; + iso->output_literally = 1; + } + if (iso->switched_dir_and_no_valid_charset_yet) + iso->switched_dir_and_no_valid_charset_yet = 0; + return 1; +} + +static int +detect_coding_iso2022 (struct detection_state *st, CONST unsigned char *src, + unsigned int n) +{ + int mask; + + /* #### There are serious deficiencies in the recognition mechanism + here. This needs to be much smarter if it's going to cut it. + The sequence "\xff\x0f" is currently detected as LOCK_SHIFT while + it should be detected as Latin-1. + All the ISO2022 stuff in this file should be synced up with the + code from FSF Emacs-20.4, in which Mule should be more or less stable. + Perhaps we should wait till R2L works in FSF Emacs? */ + + if (!st->iso2022.initted) + { + reset_iso2022 (Qnil, &st->iso2022.iso); + st->iso2022.mask = (CODING_CATEGORY_ISO_7_MASK | + CODING_CATEGORY_ISO_8_DESIGNATE_MASK | + CODING_CATEGORY_ISO_8_1_MASK | + CODING_CATEGORY_ISO_8_2_MASK | + CODING_CATEGORY_ISO_LOCK_SHIFT_MASK); + st->iso2022.flags = 0; + st->iso2022.high_byte_count = 0; + st->iso2022.saw_single_shift = 0; + st->iso2022.initted = 1; + } + + mask = st->iso2022.mask; + + while (n--) + { + int c = *src++; + if (c >= 0xA0) + { + mask &= ~CODING_CATEGORY_ISO_7_MASK; + st->iso2022.high_byte_count++; + } + else + { + if (st->iso2022.high_byte_count && !st->iso2022.saw_single_shift) + { + if (st->iso2022.high_byte_count & 1) + /* odd number of high bytes; assume not iso-8-2 */ + mask &= ~CODING_CATEGORY_ISO_8_2_MASK; + } + st->iso2022.high_byte_count = 0; + st->iso2022.saw_single_shift = 0; + if (c > 0x80) + mask &= ~CODING_CATEGORY_ISO_7_MASK; + } + if (!(st->iso2022.flags & CODING_STATE_ESCAPE) + && (BYTE_C0_P (c) || BYTE_C1_P (c))) + { /* control chars */ + switch (c) + { + /* Allow and ignore control characters that you might + reasonably see in a text file */ + case '\r': + case '\n': + case '\t': + case 7: /* bell */ + case 8: /* backspace */ + case 11: /* vertical tab */ + case 12: /* form feed */ + case 26: /* MS-DOS C-z junk */ + case 31: /* '^_' -- for info */ + goto label_continue_loop; + + default: + break; + } + } + + if ((st->iso2022.flags & CODING_STATE_ESCAPE) || BYTE_C0_P (c) + || BYTE_C1_P (c)) + { + if (parse_iso2022_esc (Qnil, &st->iso2022.iso, c, + &st->iso2022.flags, 0)) + { + switch (st->iso2022.iso.esc) + { + case ISO_ESC_DESIGNATE: + mask &= ~CODING_CATEGORY_ISO_8_1_MASK; + mask &= ~CODING_CATEGORY_ISO_8_2_MASK; + break; + case ISO_ESC_LOCKING_SHIFT: + mask = CODING_CATEGORY_ISO_LOCK_SHIFT_MASK; + goto ran_out_of_chars; + case ISO_ESC_SINGLE_SHIFT: + mask &= ~CODING_CATEGORY_ISO_8_DESIGNATE_MASK; + st->iso2022.saw_single_shift = 1; + break; + default: + break; + } + } + else + { + mask = 0; + goto ran_out_of_chars; + } + } + label_continue_loop:; + } + + ran_out_of_chars: + + return mask; +} + +static int +postprocess_iso2022_mask (int mask) +{ + /* #### kind of cheesy */ + /* If seven-bit ISO is allowed, then assume that the encoding is + entirely seven-bit and turn off the eight-bit ones. */ + if (mask & CODING_CATEGORY_ISO_7_MASK) + mask &= ~ (CODING_CATEGORY_ISO_8_DESIGNATE_MASK | + CODING_CATEGORY_ISO_8_1_MASK | + CODING_CATEGORY_ISO_8_2_MASK); + return mask; +} + +/* If FLAGS is a null pointer or specifies right-to-left motion, + output a switch-dir-to-left-to-right sequence to DST. + Also update FLAGS if it is not a null pointer. + If INTERNAL_P is set, we are outputting in internal format and + need to handle the CSI differently. */ + +static void +restore_left_to_right_direction (Lisp_Coding_System *codesys, + unsigned_char_dynarr *dst, + unsigned int *flags, + int internal_p) +{ + if (!flags || (*flags & CODING_STATE_R2L)) + { + if (CODING_SYSTEM_ISO2022_SEVEN (codesys)) + { + Dynarr_add (dst, ISO_CODE_ESC); + Dynarr_add (dst, '['); + } + else if (internal_p) + DECODE_ADD_BINARY_CHAR (ISO_CODE_CSI, dst); + else + Dynarr_add (dst, ISO_CODE_CSI); + Dynarr_add (dst, '0'); + Dynarr_add (dst, ']'); + if (flags) + *flags &= ~CODING_STATE_R2L; + } +} + +/* If FLAGS is a null pointer or specifies a direction different from + DIRECTION (which should be either CHARSET_RIGHT_TO_LEFT or + CHARSET_LEFT_TO_RIGHT), output the appropriate switch-dir escape + sequence to DST. Also update FLAGS if it is not a null pointer. + If INTERNAL_P is set, we are outputting in internal format and + need to handle the CSI differently. */ + +static void +ensure_correct_direction (int direction, Lisp_Coding_System *codesys, + unsigned_char_dynarr *dst, unsigned int *flags, + int internal_p) +{ + if ((!flags || (*flags & CODING_STATE_R2L)) && + direction == CHARSET_LEFT_TO_RIGHT) + restore_left_to_right_direction (codesys, dst, flags, internal_p); + else if (!CODING_SYSTEM_ISO2022_NO_ISO6429 (codesys) + && (!flags || !(*flags & CODING_STATE_R2L)) && + direction == CHARSET_RIGHT_TO_LEFT) + { + if (CODING_SYSTEM_ISO2022_SEVEN (codesys)) + { + Dynarr_add (dst, ISO_CODE_ESC); + Dynarr_add (dst, '['); + } + else if (internal_p) + DECODE_ADD_BINARY_CHAR (ISO_CODE_CSI, dst); + else + Dynarr_add (dst, ISO_CODE_CSI); + Dynarr_add (dst, '2'); + Dynarr_add (dst, ']'); + if (flags) + *flags |= CODING_STATE_R2L; + } +} + +/* Convert ISO2022-format data to internal format. */ + +static void +decode_coding_iso2022 (Lstream *decoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + struct decoding_stream *str = DECODING_STREAM_DATA (decoding); + unsigned int flags = str->flags; + unsigned int ch = str->ch; + eol_type_t eol_type = str->eol_type; +#ifdef ENABLE_COMPOSITE_CHARS + unsigned_char_dynarr *real_dst = dst; +#endif + Lisp_Object coding_system; + + XSETCODING_SYSTEM (coding_system, str->codesys); + +#ifdef ENABLE_COMPOSITE_CHARS + if (flags & CODING_STATE_COMPOSITE) + dst = str->iso2022.composite_chars; +#endif /* ENABLE_COMPOSITE_CHARS */ + + while (n--) + { + unsigned char c = *src++; + if (flags & CODING_STATE_ESCAPE) + { /* Within ESC sequence */ + int retval = parse_iso2022_esc (coding_system, &str->iso2022, + c, &flags, 1); + + if (retval) + { + switch (str->iso2022.esc) + { +#ifdef ENABLE_COMPOSITE_CHARS + case ISO_ESC_START_COMPOSITE: + if (str->iso2022.composite_chars) + Dynarr_reset (str->iso2022.composite_chars); + else + str->iso2022.composite_chars = Dynarr_new (unsigned_char); + dst = str->iso2022.composite_chars; + break; + case ISO_ESC_END_COMPOSITE: + { + Bufbyte comstr[MAX_EMCHAR_LEN]; + Bytecount len; + Emchar emch = lookup_composite_char (Dynarr_atp (dst, 0), + Dynarr_length (dst)); + dst = real_dst; + len = set_charptr_emchar (comstr, emch); + Dynarr_add_many (dst, comstr, len); + break; + } +#endif /* ENABLE_COMPOSITE_CHARS */ + + case ISO_ESC_LITERAL: + DECODE_ADD_BINARY_CHAR (c, dst); + break; + + default: + /* Everything else handled already */ + break; + } + } + + /* Attempted error recovery. */ + if (str->iso2022.output_direction_sequence) + ensure_correct_direction (flags & CODING_STATE_R2L ? + CHARSET_RIGHT_TO_LEFT : + CHARSET_LEFT_TO_RIGHT, + str->codesys, dst, 0, 1); + /* More error recovery. */ + if (!retval || str->iso2022.output_literally) + { + /* Output the (possibly invalid) sequence */ + int i; + for (i = 0; i < str->iso2022.esc_bytes_index; i++) + DECODE_ADD_BINARY_CHAR (str->iso2022.esc_bytes[i], dst); + flags &= CODING_STATE_ISO2022_LOCK; + if (!retval) + n++, src--;/* Repeat the loop with the same character. */ + else + { + /* No sense in reprocessing the final byte of the + escape sequence; it could mess things up anyway. + Just add it now. */ + DECODE_ADD_BINARY_CHAR (c, dst); + } + } + ch = 0; + } + else if (BYTE_C0_P (c) || BYTE_C1_P (c)) + { /* Control characters */ + + /***** Error-handling *****/ + + /* If we were in the middle of a character, dump out the + partial character. */ + DECODE_OUTPUT_PARTIAL_CHAR (ch); + + /* If we just saw a single-shift character, dump it out. + This may dump out the wrong sort of single-shift character, + but least it will give an indication that something went + wrong. */ + if (flags & CODING_STATE_SS2) + { + DECODE_ADD_BINARY_CHAR (ISO_CODE_SS2, dst); + flags &= ~CODING_STATE_SS2; + } + if (flags & CODING_STATE_SS3) + { + DECODE_ADD_BINARY_CHAR (ISO_CODE_SS3, dst); + flags &= ~CODING_STATE_SS3; + } + + /***** Now handle the control characters. *****/ + + /* Handle CR/LF */ + DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst); + + flags &= CODING_STATE_ISO2022_LOCK; + + if (!parse_iso2022_esc (coding_system, &str->iso2022, c, &flags, 1)) + DECODE_ADD_BINARY_CHAR (c, dst); + } + else + { /* Graphic characters */ + Lisp_Object charset; +#ifndef UTF2000 + Charset_ID lb; +#endif + int reg; + + DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst); + + /* Now determine the charset. */ + reg = ((flags & CODING_STATE_SS2) ? 2 + : (flags & CODING_STATE_SS3) ? 3 + : !BYTE_ASCII_P (c) ? str->iso2022.register_right + : str->iso2022.register_left); + charset = str->iso2022.charset[reg]; + + /* Error checking: */ + if (! CHARSETP (charset) + || str->iso2022.invalid_designated[reg] + || (((c & 0x7F) == ' ' || (c & 0x7F) == ISO_CODE_DEL) + && XCHARSET_CHARS (charset) == 94)) + /* Mrmph. We are trying to invoke a register that has no + or an invalid charset in it, or trying to add a character + outside the range of the charset. Insert that char literally + to preserve it for the output. */ + { + DECODE_OUTPUT_PARTIAL_CHAR (ch); + DECODE_ADD_BINARY_CHAR (c, dst); + } + + else + { + /* Things are probably hunky-dorey. */ + + /* Fetch reverse charset, maybe. */ + if (((flags & CODING_STATE_R2L) && + XCHARSET_DIRECTION (charset) == CHARSET_LEFT_TO_RIGHT) + || + (!(flags & CODING_STATE_R2L) && + XCHARSET_DIRECTION (charset) == CHARSET_RIGHT_TO_LEFT)) + { + Lisp_Object new_charset = + XCHARSET_REVERSE_DIRECTION_CHARSET (charset); + if (!NILP (new_charset)) + charset = new_charset; + } + +#ifndef UTF2000 + lb = XCHARSET_LEADING_BYTE (charset); +#endif + switch (XCHARSET_REP_BYTES (charset)) + { + case 1: /* ASCII */ + DECODE_OUTPUT_PARTIAL_CHAR (ch); + Dynarr_add (dst, c & 0x7F); + break; + + case 2: /* one-byte official */ + DECODE_OUTPUT_PARTIAL_CHAR (ch); +#ifdef UTF2000 + DECODE_ADD_UCS_CHAR(MAKE_CHAR(charset, c & 0x7F, 0), dst); +#else + Dynarr_add (dst, lb); + Dynarr_add (dst, c | 0x80); +#endif + break; + + case 3: /* one-byte private or two-byte official */ +#ifdef UTF2000 + if (XCHARSET_DIMENSION (charset) == 1) +#else + if (XCHARSET_PRIVATE_P (charset)) +#endif + { + DECODE_OUTPUT_PARTIAL_CHAR (ch); +#ifdef UTF2000 + DECODE_ADD_UCS_CHAR(MAKE_CHAR(charset, c & 0x7F, 0), + dst); +#else + Dynarr_add (dst, PRE_LEADING_BYTE_PRIVATE_1); + Dynarr_add (dst, lb); + Dynarr_add (dst, c | 0x80); +#endif + } + else + { + if (ch) + { +#ifdef UTF2000 + DECODE_ADD_UCS_CHAR(MAKE_CHAR(charset, + ch & 0x7F, + c & 0x7F), dst); +#else + Dynarr_add (dst, lb); + Dynarr_add (dst, ch | 0x80); + Dynarr_add (dst, c | 0x80); +#endif + ch = 0; + } + else + ch = c; + } + break; + + default: /* two-byte private */ + if (ch) + { +#ifdef UTF2000 + DECODE_ADD_UCS_CHAR(MAKE_CHAR(charset, + ch & 0x7F, + c & 0x7F), dst); +#else + Dynarr_add (dst, PRE_LEADING_BYTE_PRIVATE_2); + Dynarr_add (dst, lb); + Dynarr_add (dst, ch | 0x80); + Dynarr_add (dst, c | 0x80); +#endif + ch = 0; + } + else + ch = c; + } + } + + if (!ch) + flags &= CODING_STATE_ISO2022_LOCK; + } + + label_continue_loop:; + } + + if (flags & CODING_STATE_END) + DECODE_OUTPUT_PARTIAL_CHAR (ch); + + str->flags = flags; + str->ch = ch; +} + + +/***** ISO2022 encoder *****/ + +/* Designate CHARSET into register REG. */ + +static void +iso2022_designate (Lisp_Object charset, unsigned char reg, + struct encoding_stream *str, unsigned_char_dynarr *dst) +{ + static CONST char inter94[] = "()*+"; + static CONST char inter96[] = ",-./"; + unsigned int type; + unsigned char final; + Lisp_Object old_charset = str->iso2022.charset[reg]; + + str->iso2022.charset[reg] = charset; + if (!CHARSETP (charset)) + /* charset might be an initial nil or t. */ + return; + type = XCHARSET_TYPE (charset); + final = XCHARSET_FINAL (charset); + if (!str->iso2022.force_charset_on_output[reg] && + CHARSETP (old_charset) && + XCHARSET_TYPE (old_charset) == type && + XCHARSET_FINAL (old_charset) == final) + return; + + str->iso2022.force_charset_on_output[reg] = 0; + + { + charset_conversion_spec_dynarr *dyn = + str->codesys->iso2022.output_conv; + + if (dyn) + { + int i; + + for (i = 0; i < Dynarr_length (dyn); i++) + { + struct charset_conversion_spec *spec = Dynarr_atp (dyn, i); + if (EQ (charset, spec->from_charset)) + charset = spec->to_charset; + } + } + } + + Dynarr_add (dst, ISO_CODE_ESC); + switch (type) + { + case CHARSET_TYPE_94: + Dynarr_add (dst, inter94[reg]); + break; + case CHARSET_TYPE_96: + Dynarr_add (dst, inter96[reg]); + break; + case CHARSET_TYPE_94X94: + Dynarr_add (dst, '$'); + if (reg != 0 + || !(CODING_SYSTEM_ISO2022_SHORT (str->codesys)) + || final < '@' + || final > 'B') + Dynarr_add (dst, inter94[reg]); + break; + case CHARSET_TYPE_96X96: + Dynarr_add (dst, '$'); + Dynarr_add (dst, inter96[reg]); + break; + } + Dynarr_add (dst, final); +} + +static void +ensure_normal_shift (struct encoding_stream *str, unsigned_char_dynarr *dst) +{ + if (str->iso2022.register_left != 0) + { + Dynarr_add (dst, ISO_CODE_SI); + str->iso2022.register_left = 0; + } +} + +static void +ensure_shift_out (struct encoding_stream *str, unsigned_char_dynarr *dst) +{ + if (str->iso2022.register_left != 1) + { + Dynarr_add (dst, ISO_CODE_SO); + str->iso2022.register_left = 1; + } +} + +void +char_encode_iso2022 (struct encoding_stream *str, Emchar ch, + unsigned_char_dynarr *dst, unsigned int *flags) +{ + unsigned char charmask; + Lisp_Coding_System* codesys = str->codesys; + eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE (str->codesys); + int i; + Lisp_Object charset; + int half; + unsigned int byte1, byte2; + + if (ch <= 0x7F) + { + restore_left_to_right_direction (codesys, dst, flags, 0); + + /* Make sure G0 contains ASCII */ + if ((ch > ' ' && ch < ISO_CODE_DEL) + || !CODING_SYSTEM_ISO2022_NO_ASCII_CNTL (codesys)) + { + ensure_normal_shift (str, dst); + iso2022_designate (Vcharset_ascii, 0, str, dst); + } + + /* If necessary, restore everything to the default state + at end-of-line */ + if (ch == '\n' && !(CODING_SYSTEM_ISO2022_NO_ASCII_EOL (codesys))) + { + restore_left_to_right_direction (codesys, dst, flags, 0); + + ensure_normal_shift (str, dst); + + for (i = 0; i < 4; i++) + { + Lisp_Object initial_charset = + CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i); + iso2022_designate (initial_charset, i, str, dst); + } + } + if (ch == '\n') + { + if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT) + Dynarr_add (dst, '\r'); + if (eol_type != EOL_CR) + Dynarr_add (dst, ch); + } + else + { + if (CODING_SYSTEM_ISO2022_ESCAPE_QUOTED (codesys) + && fit_to_be_escape_quoted (ch)) + Dynarr_add (dst, ISO_CODE_ESC); + Dynarr_add (dst, ch); + } + } + else if ( (0x80 <= ch) && (ch <= 0x9f) ) + { + charmask = (half == 0 ? 0x00 : 0x80); + + if (CODING_SYSTEM_ISO2022_ESCAPE_QUOTED (codesys) + && fit_to_be_escape_quoted (ch)) + Dynarr_add (dst, ISO_CODE_ESC); + /* you asked for it ... */ + Dynarr_add (dst, ch); + } + else + { + int reg; + + BREAKUP_CHAR (ch, charset, byte1, byte2); + ensure_correct_direction (XCHARSET_DIRECTION (charset), + codesys, dst, flags, 0); + + /* Now determine which register to use. */ + reg = -1; + for (i = 0; i < 4; i++) + { + if (EQ (charset, str->iso2022.charset[i]) || + EQ (charset, + CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i))) + { + reg = i; + break; + } + } + + if (reg == -1) + { + if (XCHARSET_GRAPHIC (charset) != 0) + { + if (!NILP (str->iso2022.charset[1]) && + (!CODING_SYSTEM_ISO2022_SEVEN (codesys) + || CODING_SYSTEM_ISO2022_LOCK_SHIFT (codesys))) + reg = 1; + else if (!NILP (str->iso2022.charset[2])) + reg = 2; + else if (!NILP (str->iso2022.charset[3])) + reg = 3; + else + reg = 0; + } + else + reg = 0; + } + + iso2022_designate (charset, reg, str, dst); + + /* Now invoke that register. */ + switch (reg) + { + case 0: + ensure_normal_shift (str, dst); + half = 0; + break; + case 1: + if (CODING_SYSTEM_ISO2022_SEVEN (codesys)) + { + ensure_shift_out (str, dst); + half = 0; + } + else + half = 1; + break; + case 2: + if (CODING_SYSTEM_ISO2022_SEVEN (str->codesys)) + { + Dynarr_add (dst, ISO_CODE_ESC); + Dynarr_add (dst, 'N'); + half = 0; + } + else + { + Dynarr_add (dst, ISO_CODE_SS2); + half = 1; + } + break; + case 3: + if (CODING_SYSTEM_ISO2022_SEVEN (str->codesys)) + { + Dynarr_add (dst, ISO_CODE_ESC); + Dynarr_add (dst, 'O'); + half = 0; + } + else + { + Dynarr_add (dst, ISO_CODE_SS3); + half = 1; + } + break; + default: + abort (); + } + + charmask = (half == 0 ? 0x00 : 0x80); + + switch (XCHARSET_DIMENSION (charset)) + { + case 1: + Dynarr_add (dst, byte1 | charmask); + break; + case 2: + Dynarr_add (dst, byte1 | charmask); + Dynarr_add (dst, byte2 | charmask); + break; + default: + abort (); + } + } +} + +void +char_finish_iso2022 (struct encoding_stream *str, unsigned_char_dynarr *dst, + unsigned int *flags) +{ + Lisp_Coding_System* codesys = str->codesys; + int i; + + restore_left_to_right_direction (codesys, dst, flags, 0); + ensure_normal_shift (str, dst); + for (i = 0; i < 4; i++) + { + Lisp_Object initial_charset + = CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i); + iso2022_designate (initial_charset, i, str, dst); + } +} +#endif /* MULE */ + +/************************************************************************/ +/* No-conversion methods */ +/************************************************************************/ + +/* This is used when reading in "binary" files -- i.e. files that may + contain all 256 possible byte values and that are not to be + interpreted as being in any particular decoding. */ +static void +decode_coding_no_conversion (Lstream *decoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + unsigned char c; + struct decoding_stream *str = DECODING_STREAM_DATA (decoding); + unsigned int flags = str->flags; + unsigned int ch = str->ch; + eol_type_t eol_type = str->eol_type; + + while (n--) + { + c = *src++; + + DECODE_HANDLE_EOL_TYPE (eol_type, c, flags, dst); + DECODE_ADD_BINARY_CHAR (c, dst); + label_continue_loop:; + } + + DECODE_HANDLE_END_OF_CONVERSION (flags, ch, dst); + + str->flags = flags; + str->ch = ch; +} + +static void +encode_coding_no_conversion (Lstream *encoding, CONST unsigned char *src, + unsigned_char_dynarr *dst, unsigned int n) +{ + unsigned char c; + struct encoding_stream *str = ENCODING_STREAM_DATA (encoding); + unsigned int flags = str->flags; + unsigned int ch = str->ch; + eol_type_t eol_type = CODING_SYSTEM_EOL_TYPE (str->codesys); +#ifdef UTF2000 + unsigned char char_boundary = str->iso2022.current_char_boundary; +#endif + + while (n--) + { + c = *src++; +#ifdef UTF2000 + switch (char_boundary) + { + case 0: + if ( c >= 0xfc ) + { + ch = c & 0x01; + char_boundary = 5; + } + else if ( c >= 0xf8 ) + { + ch = c & 0x03; + char_boundary = 4; + } + else if ( c >= 0xf0 ) + { + ch = c & 0x07; + char_boundary = 3; + } + else if ( c >= 0xe0 ) + { + ch = c & 0x0f; + char_boundary = 2; + } + else if ( c >= 0xc0 ) + { + ch = c & 0x1f; + char_boundary = 1; + } + else + { + ch = 0; + + if (c == '\n') + { + if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT) + Dynarr_add (dst, '\r'); + if (eol_type != EOL_CR) + Dynarr_add (dst, c); + } + else + Dynarr_add (dst, c); + char_boundary = 0; + } + break; + case 1: + ch = ( ch << 6 ) | ( c & 0x3f ); + switch ( str->codesys->fixed.size ) + { + case 1: + Dynarr_add (dst, ch & 0xff); + break; + case 2: + Dynarr_add (dst, (ch >> 8) & 0xff); + Dynarr_add (dst, ch & 0xff); + break; + case 3: + Dynarr_add (dst, (ch >> 16) & 0xff); + Dynarr_add (dst, (ch >> 8) & 0xff); + Dynarr_add (dst, ch & 0xff); + break; + case 4: + Dynarr_add (dst, (ch >> 24) & 0xff); + Dynarr_add (dst, (ch >> 16) & 0xff); + Dynarr_add (dst, (ch >> 8) & 0xff); + Dynarr_add (dst, ch & 0xff); + break; + default: + fprintf(stderr, "It seems %d bytes stream.\n", + str->codesys->fixed.size); + abort (); + } + char_boundary = 0; + break; + default: + ch = ( ch << 6 ) | ( c & 0x3f ); + char_boundary--; + } +#else /* not UTF2000 */ + if (c == '\n') + { + if (eol_type != EOL_LF && eol_type != EOL_AUTODETECT) + Dynarr_add (dst, '\r'); + if (eol_type != EOL_CR) + Dynarr_add (dst, '\n'); + ch = 0; + } + else if (BYTE_ASCII_P (c)) + { + assert (ch == 0); + Dynarr_add (dst, c); + } + else if (BUFBYTE_LEADING_BYTE_P (c)) + { + assert (ch == 0); + if (c == LEADING_BYTE_LATIN_ISO8859_1 || + c == LEADING_BYTE_CONTROL_1) + ch = c; + else + Dynarr_add (dst, '~'); /* untranslatable character */ + } + else + { + if (ch == LEADING_BYTE_LATIN_ISO8859_1) + Dynarr_add (dst, c); + else if (ch == LEADING_BYTE_CONTROL_1) + { + assert (c < 0xC0); + Dynarr_add (dst, c - 0x20); + } + /* else it should be the second or third byte of an + untranslatable character, so ignore it */ + ch = 0; + } +#endif /* not UTF2000 */ + } + + str->flags = flags; + str->ch = ch; +#ifdef UTF2000 + str->iso2022.current_char_boundary = char_boundary; +#endif +} + + +/************************************************************************/ +/* Simple internal/external functions */ +/************************************************************************/ + +static Extbyte_dynarr *conversion_out_dynarr; +static Bufbyte_dynarr *conversion_in_dynarr; + +/* Determine coding system from coding format */ + +/* #### not correct for all values of `fmt'! */ +static Lisp_Object +external_data_format_to_coding_system (enum external_data_format fmt) +{ + switch (fmt) + { + case FORMAT_FILENAME: + case FORMAT_TERMINAL: + if (EQ (Vfile_name_coding_system, Qnil) || + EQ (Vfile_name_coding_system, Qbinary)) + return Qnil; + else + return Fget_coding_system (Vfile_name_coding_system); +#ifdef MULE + case FORMAT_CTEXT: + return Fget_coding_system (Qctext); +#endif + default: + return Qnil; + } +} + +Extbyte * +convert_to_external_format (CONST Bufbyte *ptr, + Bytecount len, + Extcount *len_out, + enum external_data_format fmt) +{ + Lisp_Object coding_system = external_data_format_to_coding_system (fmt); + + if (!conversion_out_dynarr) + conversion_out_dynarr = Dynarr_new (Extbyte); + else + Dynarr_reset (conversion_out_dynarr); + + if (NILP (coding_system)) + { + CONST Bufbyte *end = ptr + len; + + for (; ptr < end;) + { +#ifdef UTF2000 + Bufbyte c = + (*ptr < 0xc0) ? *ptr : + ((*ptr & 0x1f) << 6) | (*(ptr+1) & 0x3f); +#else + Bufbyte c = + (BYTE_ASCII_P (*ptr)) ? *ptr : + (*ptr == LEADING_BYTE_CONTROL_1) ? (*(ptr+1) - 0x20) : + (*ptr == LEADING_BYTE_LATIN_ISO8859_1) ? (*(ptr+1)) : + '~'; +#endif + Dynarr_add (conversion_out_dynarr, (Extbyte) c); + INC_CHARPTR (ptr); + } + +#ifdef ERROR_CHECK_BUFPOS + assert (ptr == end); +#endif + } + else + { + Lisp_Object instream, outstream, da_outstream; + Lstream *istr, *ostr; + struct gcpro gcpro1, gcpro2, gcpro3; + char tempbuf[1024]; /* some random amount */ + + instream = make_fixed_buffer_input_stream ((unsigned char *) ptr, len); + da_outstream = make_dynarr_output_stream + ((unsigned_char_dynarr *) conversion_out_dynarr); + outstream = + make_encoding_output_stream (XLSTREAM (da_outstream), coding_system); + istr = XLSTREAM (instream); + ostr = XLSTREAM (outstream); + GCPRO3 (instream, outstream, da_outstream); + while (1) + { + int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf)); + if (!size_in_bytes) + break; + Lstream_write (ostr, tempbuf, size_in_bytes); + } + Lstream_close (istr); + Lstream_close (ostr); + UNGCPRO; + Lstream_delete (istr); + Lstream_delete (ostr); + Lstream_delete (XLSTREAM (da_outstream)); + } + + *len_out = Dynarr_length (conversion_out_dynarr); + Dynarr_add (conversion_out_dynarr, 0); /* remember to zero-terminate! */ + return Dynarr_atp (conversion_out_dynarr, 0); +} + +Bufbyte * +convert_from_external_format (CONST Extbyte *ptr, + Extcount len, + Bytecount *len_out, + enum external_data_format fmt) +{ + Lisp_Object coding_system = external_data_format_to_coding_system (fmt); + + if (!conversion_in_dynarr) + conversion_in_dynarr = Dynarr_new (Bufbyte); + else + Dynarr_reset (conversion_in_dynarr); + + if (NILP (coding_system)) + { + CONST Extbyte *end = ptr + len; + for (; ptr < end; ptr++) + { + Extbyte c = *ptr; + DECODE_ADD_BINARY_CHAR (c, conversion_in_dynarr); + } + } + else + { + Lisp_Object instream, outstream, da_outstream; + Lstream *istr, *ostr; + struct gcpro gcpro1, gcpro2, gcpro3; + char tempbuf[1024]; /* some random amount */ + + instream = make_fixed_buffer_input_stream ((unsigned char *) ptr, len); + da_outstream = make_dynarr_output_stream + ((unsigned_char_dynarr *) conversion_in_dynarr); + outstream = + make_decoding_output_stream (XLSTREAM (da_outstream), coding_system); + istr = XLSTREAM (instream); + ostr = XLSTREAM (outstream); + GCPRO3 (instream, outstream, da_outstream); + while (1) + { + int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf)); + if (!size_in_bytes) + break; + Lstream_write (ostr, tempbuf, size_in_bytes); + } + Lstream_close (istr); + Lstream_close (ostr); + UNGCPRO; + Lstream_delete (istr); + Lstream_delete (ostr); + Lstream_delete (XLSTREAM (da_outstream)); + } + + *len_out = Dynarr_length (conversion_in_dynarr); + Dynarr_add (conversion_in_dynarr, 0); /* remember to zero-terminate! */ + return Dynarr_atp (conversion_in_dynarr, 0); +} + + +/************************************************************************/ +/* Initialization */ +/************************************************************************/ + +void +syms_of_file_coding (void) +{ + defsymbol (&Qbuffer_file_coding_system, "buffer-file-coding-system"); + deferror (&Qcoding_system_error, "coding-system-error", + "Coding-system error", Qio_error); + + DEFSUBR (Fcoding_system_p); + DEFSUBR (Ffind_coding_system); + DEFSUBR (Fget_coding_system); + DEFSUBR (Fcoding_system_list); + DEFSUBR (Fcoding_system_name); + DEFSUBR (Fmake_coding_system); + DEFSUBR (Fcopy_coding_system); + DEFSUBR (Fdefine_coding_system_alias); + DEFSUBR (Fsubsidiary_coding_system); + + DEFSUBR (Fcoding_system_type); + DEFSUBR (Fcoding_system_doc_string); +#ifdef MULE + DEFSUBR (Fcoding_system_charset); +#endif + DEFSUBR (Fcoding_system_property); + + DEFSUBR (Fcoding_category_list); + DEFSUBR (Fset_coding_priority_list); + DEFSUBR (Fcoding_priority_list); + DEFSUBR (Fset_coding_category_system); + DEFSUBR (Fcoding_category_system); + + DEFSUBR (Fdetect_coding_region); + DEFSUBR (Fdecode_coding_region); + DEFSUBR (Fencode_coding_region); +#ifdef MULE + DEFSUBR (Fdecode_shift_jis_char); + DEFSUBR (Fencode_shift_jis_char); + DEFSUBR (Fdecode_big5_char); + DEFSUBR (Fencode_big5_char); + DEFSUBR (Fset_ucs_char); + DEFSUBR (Fucs_char); + DEFSUBR (Fset_char_ucs); + DEFSUBR (Fchar_ucs); +#endif /* MULE */ + defsymbol (&Qcoding_system_p, "coding-system-p"); + defsymbol (&Qno_conversion, "no-conversion"); + defsymbol (&Qraw_text, "raw-text"); +#ifdef MULE + defsymbol (&Qbig5, "big5"); + defsymbol (&Qshift_jis, "shift-jis"); + defsymbol (&Qucs4, "ucs-4"); + defsymbol (&Qutf8, "utf-8"); + defsymbol (&Qccl, "ccl"); + defsymbol (&Qiso2022, "iso2022"); +#endif /* MULE */ + defsymbol (&Qmnemonic, "mnemonic"); + defsymbol (&Qeol_type, "eol-type"); + defsymbol (&Qpost_read_conversion, "post-read-conversion"); + defsymbol (&Qpre_write_conversion, "pre-write-conversion"); + + defsymbol (&Qcr, "cr"); + defsymbol (&Qlf, "lf"); + defsymbol (&Qcrlf, "crlf"); + defsymbol (&Qeol_cr, "eol-cr"); + defsymbol (&Qeol_lf, "eol-lf"); + defsymbol (&Qeol_crlf, "eol-crlf"); +#ifdef MULE + defsymbol (&Qcharset_g0, "charset-g0"); + defsymbol (&Qcharset_g1, "charset-g1"); + defsymbol (&Qcharset_g2, "charset-g2"); + defsymbol (&Qcharset_g3, "charset-g3"); + defsymbol (&Qforce_g0_on_output, "force-g0-on-output"); + defsymbol (&Qforce_g1_on_output, "force-g1-on-output"); + defsymbol (&Qforce_g2_on_output, "force-g2-on-output"); + defsymbol (&Qforce_g3_on_output, "force-g3-on-output"); + defsymbol (&Qno_iso6429, "no-iso6429"); + defsymbol (&Qinput_charset_conversion, "input-charset-conversion"); + defsymbol (&Qoutput_charset_conversion, "output-charset-conversion"); + + defsymbol (&Qshort, "short"); + defsymbol (&Qno_ascii_eol, "no-ascii-eol"); + defsymbol (&Qno_ascii_cntl, "no-ascii-cntl"); + defsymbol (&Qseven, "seven"); + defsymbol (&Qlock_shift, "lock-shift"); + defsymbol (&Qescape_quoted, "escape-quoted"); +#endif /* MULE */ + defsymbol (&Qencode, "encode"); + defsymbol (&Qdecode, "decode"); + +#ifdef MULE + defsymbol (&Qctext, "ctext"); + defsymbol (&coding_category_symbol[CODING_CATEGORY_SHIFT_JIS], + "shift-jis"); + defsymbol (&coding_category_symbol[CODING_CATEGORY_BIG5], + "big5"); + defsymbol (&coding_category_symbol[CODING_CATEGORY_UCS4], + "ucs-4"); + defsymbol (&coding_category_symbol[CODING_CATEGORY_UTF8], + "utf-8"); + defsymbol (&coding_category_symbol[CODING_CATEGORY_ISO_7], + "iso-7"); + defsymbol (&coding_category_symbol[CODING_CATEGORY_ISO_8_DESIGNATE], + "iso-8-designate"); + defsymbol (&coding_category_symbol[CODING_CATEGORY_ISO_8_1], + "iso-8-1"); + defsymbol (&coding_category_symbol[CODING_CATEGORY_ISO_8_2], + "iso-8-2"); + defsymbol (&coding_category_symbol[CODING_CATEGORY_ISO_LOCK_SHIFT], + "iso-lock-shift"); +#endif /* MULE */ + defsymbol (&coding_category_symbol[CODING_CATEGORY_NO_CONVERSION], + "no-conversion"); +} + +void +lstream_type_create_file_coding (void) +{ + LSTREAM_HAS_METHOD (decoding, reader); + LSTREAM_HAS_METHOD (decoding, writer); + LSTREAM_HAS_METHOD (decoding, rewinder); + LSTREAM_HAS_METHOD (decoding, seekable_p); + LSTREAM_HAS_METHOD (decoding, flusher); + LSTREAM_HAS_METHOD (decoding, closer); + LSTREAM_HAS_METHOD (decoding, marker); + + LSTREAM_HAS_METHOD (encoding, reader); + LSTREAM_HAS_METHOD (encoding, writer); + LSTREAM_HAS_METHOD (encoding, rewinder); + LSTREAM_HAS_METHOD (encoding, seekable_p); + LSTREAM_HAS_METHOD (encoding, flusher); + LSTREAM_HAS_METHOD (encoding, closer); + LSTREAM_HAS_METHOD (encoding, marker); +} + +void +vars_of_file_coding (void) +{ + int i; + + /* Initialize to something reasonable ... */ + for (i = 0; i <= CODING_CATEGORY_LAST; i++) + { + coding_category_system[i] = Qnil; + coding_category_by_priority[i] = i; + } + + Fprovide (intern ("file-coding")); + + DEFVAR_LISP ("keyboard-coding-system", &Vkeyboard_coding_system /* +Coding system used for TTY keyboard input. +Not used under a windowing system. +*/ ); + Vkeyboard_coding_system = Qnil; + + DEFVAR_LISP ("terminal-coding-system", &Vterminal_coding_system /* +Coding system used for TTY display output. +Not used under a windowing system. +*/ ); + Vterminal_coding_system = Qnil; + + DEFVAR_LISP ("coding-system-for-read", &Vcoding_system_for_read /* +Overriding coding system used when writing a file or process. +You should *bind* this, not set it. If this is non-nil, it specifies +the coding system that will be used when a file or process is read +in, and overrides `buffer-file-coding-system-for-read', +`insert-file-contents-pre-hook', etc. Use those variables instead of +this one for permanent changes to the environment. +*/ ); + Vcoding_system_for_read = Qnil; + + DEFVAR_LISP ("coding-system-for-write", + &Vcoding_system_for_write /* +Overriding coding system used when writing a file or process. +You should *bind* this, not set it. If this is non-nil, it specifies +the coding system that will be used when a file or process is wrote +in, and overrides `buffer-file-coding-system', +`write-region-pre-hook', etc. Use those variables instead of this one +for permanent changes to the environment. +*/ ); + Vcoding_system_for_write = Qnil; + + DEFVAR_LISP ("file-name-coding-system", &Vfile_name_coding_system /* +Coding system used to convert pathnames when accessing files. +*/ ); + Vfile_name_coding_system = Qnil; + + DEFVAR_BOOL ("enable-multibyte-characters", &enable_multibyte_characters /* +Non-nil means the buffer contents are regarded as multi-byte form +of characters, not a binary code. This affects the display, file I/O, +and behaviors of various editing commands. + +Setting this to nil does not do anything. +*/ ); + enable_multibyte_characters = 1; +} + +void +complex_vars_of_file_coding (void) +{ + staticpro (&Vcoding_system_hash_table); + Vcoding_system_hash_table = + make_lisp_hash_table (50, HASH_TABLE_NON_WEAK, HASH_TABLE_EQ); + + the_codesys_prop_dynarr = Dynarr_new (codesys_prop); + +#define DEFINE_CODESYS_PROP(Prop_Type, Sym) do \ +{ \ + struct codesys_prop csp; \ + csp.sym = (Sym); \ + csp.prop_type = (Prop_Type); \ + Dynarr_add (the_codesys_prop_dynarr, csp); \ +} while (0) + + DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qmnemonic); + DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qeol_type); + DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qeol_cr); + DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qeol_crlf); + DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qeol_lf); + DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qpost_read_conversion); + DEFINE_CODESYS_PROP (CODESYS_PROP_ALL_OK, Qpre_write_conversion); +#ifdef MULE + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qcharset_g0); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qcharset_g1); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qcharset_g2); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qcharset_g3); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qforce_g0_on_output); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qforce_g1_on_output); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qforce_g2_on_output); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qforce_g3_on_output); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qshort); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qno_ascii_eol); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qno_ascii_cntl); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qseven); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qlock_shift); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qno_iso6429); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qescape_quoted); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qinput_charset_conversion); + DEFINE_CODESYS_PROP (CODESYS_PROP_ISO2022, Qoutput_charset_conversion); + + DEFINE_CODESYS_PROP (CODESYS_PROP_CCL, Qencode); + DEFINE_CODESYS_PROP (CODESYS_PROP_CCL, Qdecode); +#endif /* MULE */ + /* Need to create this here or we're really screwed. */ + Fmake_coding_system + (Qraw_text, Qno_conversion, + build_string ("Raw text, which means it converts only line-break-codes."), + list2 (Qmnemonic, build_string ("Raw"))); + + Fmake_coding_system + (Qbinary, Qno_conversion, + build_string ("Binary, which means it does not convert anything."), + list4 (Qeol_type, Qlf, + Qmnemonic, build_string ("Binary"))); + +#ifdef UTF2000 + Fmake_coding_system + (Qutf8, Qutf8, + build_string ("Coding-system of ISO/IEC 10646 UTF-8."), + list2 (Qmnemonic, build_string ("UTF8"))); +#endif + + Fdefine_coding_system_alias (Qno_conversion, Qraw_text); + + /* Need this for bootstrapping */ + coding_category_system[CODING_CATEGORY_NO_CONVERSION] = + Fget_coding_system (Qraw_text); + +#ifdef UTF2000 + coding_category_system[CODING_CATEGORY_UTF8] + = Fget_coding_system (Qutf8); +#endif + +#ifdef MULE + { + unsigned int i; + + for (i = 0; i < 65536; i++) + ucs_to_mule_table[i] = Qnil; + } + staticpro (&mule_to_ucs_table); + mule_to_ucs_table = Fmake_char_table(Qgeneric); +#endif /* MULE */ +} -- 1.7.10.4