- if (!IS_BASE64 (c))
- return -1;
- value |= base64_char_to_value[c] << 12;
-
- STORE_BYTE (e, value >> 16);
-
- /* Process third byte of a quadruplet. */
- if (!ADVANCE_INPUT (c, istream))
- return -1;
-
- if (c == '=')
- {
- if (!ADVANCE_INPUT (c, istream))
- return -1;
- if (c != '=')
- return -1;
- continue;
- }
-
- if (!IS_BASE64 (c))
- return -1;
- value |= base64_char_to_value[c] << 6;
-
- STORE_BYTE (e, 0xff & value >> 8);
-
- /* Process fourth byte of a quadruplet. */
- if (!ADVANCE_INPUT (c, istream))
- return -1;
-
- if (c == '=')
- continue;
-
- if (!IS_BASE64 (c))
- return -1;
- value |= base64_char_to_value[c];
-
- STORE_BYTE (e, 0xff & value);
- }
-
- return e - to;
-}
-#undef ADVANCE_INPUT
-#undef INPUT_EOF_P
-
-static Lisp_Object
-free_malloced_ptr (Lisp_Object unwind_obj)
-{
- void *ptr = (void *)get_opaque_ptr (unwind_obj);
- xfree (ptr);
- free_opaque_ptr (unwind_obj);
- return Qnil;
-}
-
-/* Don't use alloca for regions larger than this, lest we overflow
- the stack. */
-#define MAX_ALLOCA 65536
-
-/* We need to setup proper unwinding, because there is a number of
- ways these functions can blow up, and we don't want to have memory
- leaks in those cases. */
-#define XMALLOC_OR_ALLOCA(ptr, len, type) do { \
- size_t XOA_len = (len); \
- if (XOA_len > MAX_ALLOCA) \
- { \
- ptr = xnew_array (type, XOA_len); \
- record_unwind_protect (free_malloced_ptr, \
- make_opaque_ptr ((void *)ptr)); \
- } \
- else \
- ptr = alloca_array (type, XOA_len); \
-} while (0)
-
-#define XMALLOC_UNBIND(ptr, len, speccount) do { \
- if ((len) > MAX_ALLOCA) \
- unbind_to (speccount, Qnil); \
-} while (0)
-
-DEFUN ("base64-encode-region", Fbase64_encode_region, 2, 3, "r", /*
-Base64-encode the region between BEG and END.
-Return the length of the encoded text.
-Optional third argument NO-LINE-BREAK means do not break long lines
-into shorter lines.
-*/
- (beg, end, no_line_break))
-{
- Bufbyte *encoded;
- Bytind encoded_length;
- Charcount allength, length;
- struct buffer *buf = current_buffer;
- Bufpos begv, zv, old_pt = BUF_PT (buf);
- Lisp_Object input;
- int speccount = specpdl_depth();
-
- get_buffer_range_char (buf, beg, end, &begv, &zv, 0);
- barf_if_buffer_read_only (buf, begv, zv);
-
- /* We need to allocate enough room for encoding the text.
- We need 33 1/3% more space, plus a newline every 76
- characters, and then we round up. */
- length = zv - begv;
- allength = length + length/3 + 1;
- allength += allength / MIME_LINE_LENGTH + 1 + 6;
-
- input = make_lisp_buffer_input_stream (buf, begv, zv, 0);
- /* We needn't multiply allength with MAX_EMCHAR_LEN because all the
- base64 characters will be single-byte. */
- XMALLOC_OR_ALLOCA (encoded, allength, Bufbyte);
- encoded_length = base64_encode_1 (XLSTREAM (input), encoded,
- NILP (no_line_break));
- if (encoded_length > allength)
- abort ();
- Lstream_delete (XLSTREAM (input));
-
- /* Now we have encoded the region, so we insert the new contents
- and delete the old. (Insert first in order to preserve markers.) */
- buffer_insert_raw_string_1 (buf, begv, encoded, encoded_length, 0);
- XMALLOC_UNBIND (encoded, allength, speccount);
- buffer_delete_range (buf, begv + encoded_length, zv + encoded_length, 0);
-
- /* Simulate FSF Emacs: if point was in the region, place it at the
- beginning. */
- if (old_pt >= begv && old_pt < zv)
- BUF_SET_PT (buf, begv);
-
- /* We return the length of the encoded text. */
- return make_int (encoded_length);
-}
-
-DEFUN ("base64-encode-string", Fbase64_encode_string, 1, 1, 0, /*
-Base64 encode STRING and return the result.
-*/
- (string))
-{
- Charcount allength, length;
- Bytind encoded_length;
- Bufbyte *encoded;
- Lisp_Object input, result;
- int speccount = specpdl_depth();
-
- CHECK_STRING (string);
-
- length = XSTRING_CHAR_LENGTH (string);
- allength = length + length/3 + 1 + 6;
-
- input = make_lisp_string_input_stream (string, 0, -1);
- XMALLOC_OR_ALLOCA (encoded, allength, Bufbyte);
- encoded_length = base64_encode_1 (XLSTREAM (input), encoded, 0);
- if (encoded_length > allength)
- abort ();
- Lstream_delete (XLSTREAM (input));
- result = make_string (encoded, encoded_length);
- XMALLOC_UNBIND (encoded, allength, speccount);
- return result;
-}
-
-DEFUN ("base64-decode-region", Fbase64_decode_region, 2, 2, "r", /*
-Base64-decode the region between BEG and END.
-Return the length of the decoded text.
-If the region can't be decoded, return nil and don't modify the buffer.
-*/
- (beg, end))
-{
- struct buffer *buf = current_buffer;
- Bufpos begv, zv, old_pt = BUF_PT (buf);
- Bufbyte *decoded;
- Bytind decoded_length;
- Charcount length, cc_decoded_length;
- Lisp_Object input;
- int speccount = specpdl_depth();
-
- get_buffer_range_char (buf, beg, end, &begv, &zv, 0);
- barf_if_buffer_read_only (buf, begv, zv);
-
- length = zv - begv;
-
- input = make_lisp_buffer_input_stream (buf, begv, zv, 0);
- /* We need to allocate enough room for decoding the text. */
- XMALLOC_OR_ALLOCA (decoded, length * MAX_EMCHAR_LEN, Bufbyte);
- decoded_length = base64_decode_1 (XLSTREAM (input), decoded, &cc_decoded_length);
- if (decoded_length > length * MAX_EMCHAR_LEN)
- abort ();
- Lstream_delete (XLSTREAM (input));
-
- if (decoded_length < 0)
- {
- /* The decoding wasn't possible. */
- XMALLOC_UNBIND (decoded, length * MAX_EMCHAR_LEN, speccount);
- return Qnil;
- }
-
- /* Now we have decoded the region, so we insert the new contents
- and delete the old. (Insert first in order to preserve markers.) */
- BUF_SET_PT (buf, begv);
- buffer_insert_raw_string_1 (buf, begv, decoded, decoded_length, 0);
- XMALLOC_UNBIND (decoded, length * MAX_EMCHAR_LEN, speccount);
- buffer_delete_range (buf, begv + cc_decoded_length,
- zv + cc_decoded_length, 0);
-
- /* Simulate FSF Emacs: if point was in the region, place it at the
- beginning. */
- if (old_pt >= begv && old_pt < zv)
- BUF_SET_PT (buf, begv);
-
- return make_int (cc_decoded_length);
-}
-
-DEFUN ("base64-decode-string", Fbase64_decode_string, 1, 1, 0, /*
-Base64-decode STRING and return the result.
-*/
- (string))
-{
- Bufbyte *decoded;
- Bytind decoded_length;
- Charcount length, cc_decoded_length;
- Lisp_Object input, result;
- int speccount = specpdl_depth();
-
- CHECK_STRING (string);
-
- length = XSTRING_CHAR_LENGTH (string);
- /* We need to allocate enough room for decoding the text. */
- XMALLOC_OR_ALLOCA (decoded, length * MAX_EMCHAR_LEN, Bufbyte);
-
- input = make_lisp_string_input_stream (string, 0, -1);
- decoded_length = base64_decode_1 (XLSTREAM (input), decoded,
- &cc_decoded_length);
- if (decoded_length > length * MAX_EMCHAR_LEN)
- abort ();
- Lstream_delete (XLSTREAM (input));
-
- if (decoded_length < 0)
- {
- /* The decoding wasn't possible. */
- XMALLOC_UNBIND (decoded, length * MAX_EMCHAR_LEN, speccount);
- return Qnil;
- }
-
- result = make_string (decoded, decoded_length);
- XMALLOC_UNBIND (decoded, length * MAX_EMCHAR_LEN, speccount);
- return result;
-}