--- /dev/null
+/* base64 interface for XEmacs.
+ Copyright (C) 1998 Free Software Foundation, 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: Not in FSF. */
+
+/* Author: William Perry <wmperry@aventail.com> */
+
+#include <config.h>
+
+#include "lisp.h"
+#include "buffer.h"
+#include "insdel.h"
+#include "lstream.h"
+#ifdef FILE_CODING
+#include "file-coding.h"
+#endif
+
+unsigned char alphabet[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+DEFUN ("base64-encode", Fbase64_encode, 1, 5, 0, /*
+Return the base64 encoding of an object.
+OBJECT is either a string or a buffer.
+Optional arguments START and END denote buffer positions for computing the
+hash of a portion of OBJECT. The optional CODING argument specifies the coding
+system the text is to be represented in while computing the digest. This only
+has meaning with MULE, and defaults to the current format of the data.
+If ERROR-ME-NOT is nil, report an error if the coding system can't be
+determined. Else assume binary coding if all else fails.
+*/
+ (object, start, end, coding, error_me_not))
+{
+ int cols,bits,char_count;
+ Lisp_Object instream, outstream,deststream;
+ Lstream *istr, *ostr, *dstr;
+ static Extbyte_dynarr *conversion_out_dynarr;
+ static Extbyte_dynarr *out_dynarr;
+ char tempbuf[1024]; /* some random amount */
+ struct gcpro gcpro1, gcpro2;
+#ifdef FILE_CODING
+ Lisp_Object conv_out_stream, coding_system;
+ Lstream *costr;
+ struct gcpro gcpro3;
+#endif
+
+ if (!conversion_out_dynarr)
+ conversion_out_dynarr = Dynarr_new (Extbyte);
+ else
+ Dynarr_reset (conversion_out_dynarr);
+
+ if (!out_dynarr)
+ out_dynarr = Dynarr_new(Extbyte);
+ else
+ Dynarr_reset (out_dynarr);
+
+ char_count = bits = cols = 0;
+
+ /* set up the in stream */
+ if (BUFFERP (object))
+ {
+ struct buffer *b = decode_buffer (object, 1);
+ Bufpos begv, endv;
+ /* Figure out where we need to get info from */
+ get_buffer_range_char (b, start, end, &begv, &endv, GB_ALLOW_NIL);
+
+ instream = make_lisp_buffer_input_stream (b, begv, endv, 0);
+ }
+ else
+ {
+ Bytecount bstart, bend;
+ CHECK_STRING (object);
+ get_string_range_byte (object, start, end, &bstart, &bend,
+ GB_HISTORICAL_STRING_BEHAVIOR);
+ instream = make_lisp_string_input_stream (object, bstart, bend);
+ }
+ istr = XLSTREAM (instream);
+
+#ifdef FILE_CODING
+ /* Find out what format the buffer will be saved in, so we can make
+ the digest based on what it will look like on disk */
+ if (NILP(coding))
+ {
+ if (BUFFERP(object))
+ {
+ /* Use the file coding for this buffer by default */
+ coding_system = XBUFFER(object)->buffer_file_coding_system;
+ }
+ else
+ {
+ /* attempt to autodetect the coding of the string. Note: this VERY hit-and-miss */
+ enum eol_type eol = EOL_AUTODETECT;
+ coding_system = Fget_coding_system(Qundecided);
+ determine_real_coding_system(istr, &coding_system, &eol);
+ }
+ if (NILP(coding_system))
+ coding_system = Fget_coding_system(Qbinary);
+ else
+ {
+ coding_system = Ffind_coding_system (coding_system);
+ if (NILP(coding_system))
+ coding_system = Fget_coding_system(Qbinary);
+ }
+ }
+ else
+ {
+ coding_system = Ffind_coding_system (coding);
+ if (NILP(coding_system))
+ {
+ if (NILP(error_me_not))
+ signal_simple_error("No such coding system", coding);
+ else
+ coding_system = Fget_coding_system(Qbinary); /* default to binary */
+ }
+ }
+#endif
+
+ /* setup the out stream */
+ outstream = make_dynarr_output_stream((unsigned_char_dynarr *)conversion_out_dynarr);
+ ostr = XLSTREAM (outstream);
+ deststream = make_dynarr_output_stream((unsigned_char_dynarr *)out_dynarr);
+ dstr = XLSTREAM (deststream);
+#ifdef FILE_CODING
+ /* setup the conversion stream */
+ conv_out_stream = make_encoding_output_stream (ostr, coding_system);
+ costr = XLSTREAM (conv_out_stream);
+ GCPRO3 (instream, outstream, conv_out_stream);
+#else
+ GCPRO2 (instream, outstream);
+#endif
+
+ /* Get the data while doing the conversion */
+ while (1) {
+ int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf));
+ int l;
+ if (!size_in_bytes)
+ break;
+ /* It does seem the flushes are necessary... */
+#ifdef FILE_CODING
+ Lstream_write (costr, tempbuf, size_in_bytes);
+ Lstream_flush (costr);
+#else
+ Lstream_write (ostr, tempbuf, size_in_bytes);
+#endif
+ Lstream_flush (ostr);
+
+ /* Update the base64 output buffer */
+ for (l = 0; l < size_in_bytes; l++) {
+ bits += Dynarr_at(conversion_out_dynarr,l);
+ char_count++;
+ if (char_count == 3) {
+ static char obuf[4];
+ obuf[0] = alphabet[(bits >> 18)];
+ obuf[1] = alphabet[(bits >> 12) & 0x3f];
+ obuf[2] = alphabet[(bits >> 6) & 0x3f];
+ obuf[3] = alphabet[bits & 0x3f];
+
+ Lstream_write(dstr,obuf,sizeof(obuf));
+ cols += 4;
+ if (cols == 72) {
+ Lstream_write(dstr,"\n",sizeof(unsigned char));
+ cols = 0;
+ }
+ bits = char_count = 0;
+ } else {
+ bits <<= 8;
+ }
+ }
+ /* reset the dynarr */
+ Lstream_rewind(ostr);
+ }
+ Lstream_close (istr);
+#ifdef FILE_CODING
+ Lstream_close (costr);
+#endif
+ Lstream_close (ostr);
+
+ if (char_count != 0) {
+ bits <<= 16 - (8 * char_count);
+ Lstream_write(dstr,&alphabet[bits >> 18],sizeof(unsigned char));
+ Lstream_write(dstr,&alphabet[(bits >> 12) & 0x3f],sizeof(unsigned char));
+ if (char_count == 1) {
+ Lstream_write(dstr,"==",2 * sizeof(unsigned char));
+ } else {
+ Lstream_write(dstr,&alphabet[(bits >> 6) & 0x3f],sizeof(unsigned char));
+ Lstream_write(dstr,"=",sizeof(unsigned char));
+ }
+ }
+#if 0
+ if (cols > 0) {
+ Lstream_write(dstr,"\n",sizeof(unsigned char));
+ }
+#endif
+ UNGCPRO;
+ Lstream_delete (istr);
+ Lstream_delete (ostr);
+#ifdef FILE_CODING
+ Lstream_delete (costr);
+#endif
+ Lstream_flush(dstr);
+ Lstream_delete(dstr);
+
+ return(make_string(Dynarr_atp(out_dynarr,0),Dynarr_length(out_dynarr)));
+}
+
+DEFUN ("base64-decode", Fbase64_decode, 1, 5, 0, /*
+Undo the base64 encoding of an object.
+OBJECT is either a string or a buffer.
+Optional arguments START and END denote buffer positions for computing the
+hash of a portion of OBJECT. The optional CODING argument specifies the coding
+system the text is to be represented in while computing the digest. This only
+has meaning with MULE, and defaults to the current format of the data.
+If ERROR-ME-NOT is nil, report an error if the coding system can't be
+determined. Else assume binary coding if all else fails.
+*/
+ (object, start, end, coding, error_me_not))
+{
+ static char inalphabet[256], decoder[256];
+ int i,cols,bits,char_count,hit_eof;
+ Lisp_Object instream, outstream,deststream;
+ Lstream *istr, *ostr, *dstr;
+ static Extbyte_dynarr *conversion_out_dynarr;
+ static Extbyte_dynarr *out_dynarr;
+ char tempbuf[1024]; /* some random amount */
+ struct gcpro gcpro1, gcpro2;
+#ifdef FILE_CODING
+ Lisp_Object conv_out_stream, coding_system;
+ Lstream *costr;
+ struct gcpro gcpro3;
+#endif
+
+ for (i = (sizeof alphabet) - 1; i >= 0 ; i--) {
+ inalphabet[alphabet[i]] = 1;
+ decoder[alphabet[i]] = i;
+ }
+
+ if (!conversion_out_dynarr)
+ conversion_out_dynarr = Dynarr_new (Extbyte);
+ else
+ Dynarr_reset (conversion_out_dynarr);
+
+ if (!out_dynarr)
+ out_dynarr = Dynarr_new(Extbyte);
+ else
+ Dynarr_reset (out_dynarr);
+
+ char_count = bits = cols = hit_eof = 0;
+
+ /* set up the in stream */
+ if (BUFFERP (object))
+ {
+ struct buffer *b = decode_buffer (object, 1);
+ Bufpos begv, endv;
+ /* Figure out where we need to get info from */
+ get_buffer_range_char (b, start, end, &begv, &endv, GB_ALLOW_NIL);
+
+ instream = make_lisp_buffer_input_stream (b, begv, endv, 0);
+ }
+ else
+ {
+ Bytecount bstart, bend;
+ CHECK_STRING (object);
+ get_string_range_byte (object, start, end, &bstart, &bend,
+ GB_HISTORICAL_STRING_BEHAVIOR);
+ instream = make_lisp_string_input_stream (object, bstart, bend);
+ }
+ istr = XLSTREAM (instream);
+
+#ifdef FILE_CODING
+ /* Find out what format the buffer will be saved in, so we can make
+ the digest based on what it will look like on disk */
+ if (NILP(coding))
+ {
+ if (BUFFERP(object))
+ {
+ /* Use the file coding for this buffer by default */
+ coding_system = XBUFFER(object)->buffer_file_coding_system;
+ }
+ else
+ {
+ /* attempt to autodetect the coding of the string. Note: this VERY hit-and-miss */
+ enum eol_type eol = EOL_AUTODETECT;
+ coding_system = Fget_coding_system(Qundecided);
+ determine_real_coding_system(istr, &coding_system, &eol);
+ }
+ if (NILP(coding_system))
+ coding_system = Fget_coding_system(Qbinary);
+ else
+ {
+ coding_system = Ffind_coding_system (coding_system);
+ if (NILP(coding_system))
+ coding_system = Fget_coding_system(Qbinary);
+ }
+ }
+ else
+ {
+ coding_system = Ffind_coding_system (coding);
+ if (NILP(coding_system))
+ {
+ if (NILP(error_me_not))
+ signal_simple_error("No such coding system", coding);
+ else
+ coding_system = Fget_coding_system(Qbinary); /* default to binary */
+ }
+ }
+#endif
+
+ /* setup the out stream */
+ outstream = make_dynarr_output_stream((unsigned_char_dynarr *)conversion_out_dynarr);
+ ostr = XLSTREAM (outstream);
+ deststream = make_dynarr_output_stream((unsigned_char_dynarr *)out_dynarr);
+ dstr = XLSTREAM (deststream);
+#ifdef FILE_CODING
+ /* setup the conversion stream */
+ conv_out_stream = make_encoding_output_stream (ostr, coding_system);
+ costr = XLSTREAM (conv_out_stream);
+ GCPRO3 (instream, outstream, conv_out_stream);
+#else
+ GCPRO2 (instream, outstream);
+#endif
+
+ /* Get the data while doing the conversion */
+ while (1) {
+ int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf));
+ int l;
+ if (!size_in_bytes) {
+ hit_eof = 1;
+ break;
+ }
+ /* It does seem the flushes are necessary... */
+#ifdef FILE_CODING
+ Lstream_write (costr, tempbuf, size_in_bytes);
+ Lstream_flush (costr);
+#else
+ Lstream_write (ostr, tempbuf, size_in_bytes);
+#endif
+ Lstream_flush (ostr);
+
+ /* Update the base64 output buffer */
+ for (l = 0; l < size_in_bytes; l++) {
+ if (Dynarr_at(conversion_out_dynarr,l) == '=')
+ goto decoder_out;
+ bits += decoder[Dynarr_at(conversion_out_dynarr,l)];
+ fprintf(stderr,"%d\n",bits);
+ char_count++;
+ if (char_count == 4) {
+ static unsigned char obuf[3];
+ obuf[0] = (bits >> 16);
+ obuf[1] = (bits >> 8) & 0xff;
+ obuf[2] = (bits & 0xff);
+
+ Lstream_write(dstr,obuf,sizeof(obuf));
+ bits = char_count = 0;
+ } else {
+ bits <<= 6;
+ }
+ }
+ /* reset the dynarr */
+ Lstream_rewind(ostr);
+ }
+ decoder_out:
+ Lstream_close (istr);
+#ifdef FILE_CODING
+ Lstream_close (costr);
+#endif
+ Lstream_close (ostr);
+
+ if (hit_eof) {
+ if (char_count) {
+ error_with_frob(object,"base64-decode failed: at least %d bits truncated",((4 - char_count) * 6));
+ }
+ }
+ switch(char_count) {
+ case 1:
+ error_with_frob(object, "base64 encoding incomplete: at least 2 bits missing");
+ break;
+ case 2:
+ char_count = bits >> 10;
+ Lstream_write(dstr,&char_count,sizeof(char_count));
+ break;
+ case 3:
+ {
+ unsigned char buf[2];
+ buf[0] = (bits >> 16);
+ buf[1] = (bits >> 8) & 0xff;
+ Lstream_write(dstr,buf,sizeof(buf));
+ break;
+ }
+ }
+
+ UNGCPRO;
+ Lstream_delete (istr);
+ Lstream_delete (ostr);
+#ifdef FILE_CODING
+ Lstream_delete (costr);
+#endif
+ Lstream_flush(dstr);
+ Lstream_delete(dstr);
+
+ return(make_string(Dynarr_atp(out_dynarr,0),Dynarr_length(out_dynarr)));
+}
+
+void
+syms_of (void)
+{
+ DEFSUBR(Fbase64_encode);
+ DEFSUBR(Fbase64_decode);
+}
+
+void
+vars_of (void)
+{
+ Fprovide (intern ("base64"));
+}
projects / chise / xemacs-chise.git.1 / blobdiff