diff options
Diffstat (limited to 'camel/camel-mime-filter-yenc.c')
-rw-r--r-- | camel/camel-mime-filter-yenc.c | 577 |
1 files changed, 577 insertions, 0 deletions
diff --git a/camel/camel-mime-filter-yenc.c b/camel/camel-mime-filter-yenc.c new file mode 100644 index 0000000000..b53486ca98 --- /dev/null +++ b/camel/camel-mime-filter-yenc.c @@ -0,0 +1,577 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */ +/* + * Authors: Jeffrey Stedfast <fejj@ximian.com> + * + * Copyright 2002-2004 Ximian, Inc. (www.ximian.com) + * + * This program 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 of the License, or + * (at your option) any later version. + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA. + * + */ + + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <string.h> + +#include "camel-mime-filter-yenc.h" + +static void camel_mime_filter_yenc_class_init (CamelMimeFilterYencClass *klass); +static void camel_mime_filter_yenc_init (CamelMimeFilterYenc *filter, CamelMimeFilterYencClass *klass); + +static void filter_filter (CamelMimeFilter *filter, char *in, size_t len, size_t prespace, + char **out, size_t *outlen, size_t *outprespace); +static void filter_complete (CamelMimeFilter *filter, char *in, size_t len, size_t prespace, + char **out, size_t *outlen, size_t *outprespace); +static void filter_reset (CamelMimeFilter *filter); + + +static CamelMimeFilterClass *parent_class = NULL; + + +CamelType +camel_mime_filter_yenc_get_type (void) +{ + static CamelType type = CAMEL_INVALID_TYPE; + + if (type == CAMEL_INVALID_TYPE) { + type = camel_type_register (camel_mime_filter_get_type (), + "CamelMimeFilterYenc", + sizeof (CamelMimeFilterYenc), + sizeof (CamelMimeFilterYencClass), + (CamelObjectClassInitFunc) camel_mime_filter_yenc_class_init, + NULL, + (CamelObjectInitFunc) camel_mime_filter_yenc_init, + NULL); + } + + return type; +} + + +static void +camel_mime_filter_yenc_class_init (CamelMimeFilterYencClass *klass) +{ + CamelMimeFilterClass *filter_class = (CamelMimeFilterClass *) klass; + + parent_class = CAMEL_MIME_FILTER_CLASS (camel_type_get_global_classfuncs (camel_mime_filter_get_type ())); + + filter_class->reset = filter_reset; + filter_class->filter = filter_filter; + filter_class->complete = filter_complete; +} + +static void +camel_mime_filter_yenc_init (CamelMimeFilterYenc *filter, CamelMimeFilterYencClass *klass) +{ + filter->part = 0; + filter->pcrc = CAMEL_MIME_YENCODE_CRC_INIT; + filter->crc = CAMEL_MIME_YENCODE_CRC_INIT; +} + + +/* here we do all of the basic yEnc filtering */ +static void +filter_filter (CamelMimeFilter *filter, char *in, size_t len, size_t prespace, + char **out, size_t *outlen, size_t *outprespace) +{ + CamelMimeFilterYenc *yenc = (CamelMimeFilterYenc *) filter; + size_t newlen = 0; + + switch (yenc->direction) { + case CAMEL_MIME_FILTER_YENC_DIRECTION_ENCODE: + /* won't go to more than 2 * (x + 2) + 62 */ + camel_mime_filter_set_size (filter, (len + 2) * 2 + 62, FALSE); + newlen = camel_yencode_step (in, len, filter->outbuf, ¥c->state, + ¥c->pcrc, ¥c->crc); + g_assert (newlen <= (len + 2) * 2 + 62); + break; + case CAMEL_MIME_FILTER_YENC_DIRECTION_DECODE: + if (!(yenc->state & CAMEL_MIME_YDECODE_STATE_DECODE)) { + register char *inptr, *inend; + size_t left; + + inptr = in; + inend = inptr + len; + + /* we cannot start decoding until we have found an =ybegin line */ + if (!(yenc->state & CAMEL_MIME_YDECODE_STATE_BEGIN)) { + while (inptr < inend) { + left = inend - inptr; + if (left < 8) { + if (!strncmp (inptr, "=ybegin ", left)) + camel_mime_filter_backup (filter, inptr, left); + break; + } else if (!strncmp (inptr, "=ybegin ", 8)) { + for (in = inptr; inptr < inend && *inptr != '\n'; inptr++); + if (inptr < inend) { + inptr++; + yenc->state |= CAMEL_MIME_YDECODE_STATE_BEGIN; + /* we can start ydecoding if the next line isn't + a ypart... */ + in = inptr; + len = inend - in; + } else { + /* we don't have enough... */ + camel_mime_filter_backup (filter, in, left); + } + break; + } + + /* go to the next line */ + while (inptr < inend && *inptr != '\n') + inptr++; + + if (inptr < inend) + inptr++; + } + } + + left = inend - inptr; + if ((yenc->state & CAMEL_MIME_YDECODE_STATE_BEGIN) && left > 0) { + /* we have found an '=ybegin' line but we may yet have an "=ypart" line to + yield before decoding the content */ + if (left < 7 && !strncmp (inptr, "=ypart ", left)) { + camel_mime_filter_backup (filter, inptr, left); + } else if (!strncmp (inptr, "=ypart ", 7)) { + for (in = inptr; inptr < inend && *inptr != '\n'; inptr++); + if (inptr < inend) { + inptr++; + yenc->state |= CAMEL_MIME_YDECODE_STATE_PART | CAMEL_MIME_YDECODE_STATE_DECODE; + in = inptr; + len = inend - in; + } else { + camel_mime_filter_backup (filter, in, left); + } + } else { + /* guess it doesn't have a =ypart line */ + yenc->state |= CAMEL_MIME_YDECODE_STATE_DECODE; + } + } + } + + if ((yenc->state & CAMEL_MIME_YDECODE_STATE_DECODE) && !(yenc->state & CAMEL_MIME_YDECODE_STATE_END)) { + /* all yEnc headers have been found so we can now start decoding */ + camel_mime_filter_set_size (filter, len + 3, FALSE); + newlen = camel_ydecode_step (in, len, filter->outbuf, ¥c->state, ¥c->pcrc, ¥c->crc); + g_assert (newlen <= len + 3); + } else { + newlen = 0; + } + break; + } + + *out = filter->outbuf; + *outlen = newlen; + *outprespace = filter->outpre; +} + +static void +filter_complete (CamelMimeFilter *filter, char *in, size_t len, size_t prespace, + char **out, size_t *outlen, size_t *outprespace) +{ + CamelMimeFilterYenc *yenc = (CamelMimeFilterYenc *) filter; + size_t newlen = 0; + + switch (yenc->direction) { + case CAMEL_MIME_FILTER_YENC_DIRECTION_ENCODE: + /* won't go to more than 2 * (x + 2) + 62 */ + camel_mime_filter_set_size (filter, (len + 2) * 2 + 62, FALSE); + newlen = camel_yencode_close (in, len, filter->outbuf, ¥c->state, + ¥c->pcrc, ¥c->crc); + g_assert (newlen <= (len + 2) * 2 + 62); + break; + case CAMEL_MIME_FILTER_YENC_DIRECTION_DECODE: + if ((yenc->state & CAMEL_MIME_YDECODE_STATE_DECODE) && !(yenc->state & CAMEL_MIME_YDECODE_STATE_END)) { + /* all yEnc headers have been found so we can now start decoding */ + camel_mime_filter_set_size (filter, len + 3, FALSE); + newlen = camel_ydecode_step (in, len, filter->outbuf, ¥c->state, + ¥c->pcrc, ¥c->crc); + g_assert (newlen <= len + 3); + } else { + newlen = 0; + } + break; + } + + *out = filter->outbuf; + *outlen = newlen; + *outprespace = filter->outpre; +} + +/* should this 'flush' outstanding state/data bytes? */ +static void +filter_reset (CamelMimeFilter *filter) +{ + CamelMimeFilterYenc *yenc = (CamelMimeFilterYenc *) filter; + + switch (yenc->direction) { + case CAMEL_MIME_FILTER_YENC_DIRECTION_ENCODE: + yenc->state = CAMEL_MIME_YENCODE_STATE_INIT; + break; + case CAMEL_MIME_FILTER_YENC_DIRECTION_DECODE: + yenc->state = CAMEL_MIME_YDECODE_STATE_INIT; + break; + } + yenc->pcrc = CAMEL_MIME_YENCODE_CRC_INIT; + yenc->crc = CAMEL_MIME_YENCODE_CRC_INIT; +} + + +/** + * camel_mime_filter_yenc_new: + * @direction: encode direction + * + * Creates a new yEnc filter. + * + * Returns a new yEnc filter. + **/ +CamelMimeFilter * +camel_mime_filter_yenc_new (CamelMimeFilterYencDirection direction) +{ + CamelMimeFilterYenc *new; + + new = (CamelMimeFilterYenc *) camel_object_new (CAMEL_TYPE_MIME_FILTER_YENC); + new->direction = direction; + + switch (direction) { + case CAMEL_MIME_FILTER_YENC_DIRECTION_ENCODE: + new->state = CAMEL_MIME_YENCODE_STATE_INIT; + break; + case CAMEL_MIME_FILTER_YENC_DIRECTION_DECODE: + new->state = CAMEL_MIME_YDECODE_STATE_INIT; + break; + default: + g_assert_not_reached (); + } + + return (CamelMimeFilter *) new; +} + + +/** + * camel_mime_filter_yenc_set_state: + * @yenc: yEnc filter + * @state: encode/decode state + * + * Sets the current state of the yencoder/ydecoder + **/ +void +camel_mime_filter_yenc_set_state (CamelMimeFilterYenc *yenc, int state) +{ + g_return_if_fail (CAMEL_IS_MIME_FILTER_YENC (yenc)); + + yenc->state = state; +} + + +/** + * camel_mime_filter_yenc_set_crc: + * @yenc: yEnc filter + * @crc: crc32 + * + * Sets the current crc32 value on the yEnc filter @yenc to @crc. + **/ +void +camel_mime_filter_yenc_set_crc (CamelMimeFilterYenc *yenc, guint32 crc) +{ + g_return_if_fail (CAMEL_IS_MIME_FILTER_YENC (yenc)); + + yenc->crc = crc; +} + + +#if 0 +/* FIXME: once we parse out the yenc part id, we can re-enable this interface */ +/** + * camel_mime_filter_yenc_get_part: + * @yenc: yEnc filter + * + * Gets the part id of the current decoded yEnc stream or -1 on fail. + * + * Returns the part id of the current decoded yEnc stream or -1 on + * fail. + **/ +int +camel_mime_filter_yenc_get_part (CamelMimeFilterYenc *yenc) +{ + g_return_val_if_fail (CAMEL_IS_MIME_FILTER_YENC (yenc), -1); + + if (yenc->state & CAMEL_MIME_YDECODE_STATE_PART) + return yenc->part; + + return -1; +} +#endif + +/** + * camel_mime_filter_yenc_get_pcrc: + * @yenc: yEnc filter + * + * Get the computed part crc or (guint32) -1 on fail. + * + * Returns the computed part crc or (guint32) -1 on fail. + **/ +guint32 +camel_mime_filter_yenc_get_pcrc (CamelMimeFilterYenc *yenc) +{ + g_return_val_if_fail (CAMEL_IS_MIME_FILTER_YENC (yenc), -1); + + return CAMEL_MIME_YENCODE_CRC_FINAL (yenc->pcrc); +} + + +/** + * camel_mime_filter_yenc_get_crc: + * @yenc: yEnc filter + * + * Get the computed crc or (guint32) -1 on fail. + * + * Returns the computed crc or (guint32) -1 on fail. + **/ +guint32 +camel_mime_filter_yenc_get_crc (CamelMimeFilterYenc *yenc) +{ + g_return_val_if_fail (CAMEL_IS_MIME_FILTER_YENC (yenc), -1); + + return CAMEL_MIME_YENCODE_CRC_FINAL (yenc->crc); +} + + +static const int yenc_crc_table[256] = { + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, + 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, + 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, + 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, + 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, + 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, + 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, + 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, + 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, + 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, + 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, + 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, + 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, + 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, + 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, + 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, + 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, + 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, + 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, + 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, + 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, + 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, + 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, + 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, + 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, + 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, + 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, + 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, + 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, + 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d +}; + +#define yenc_crc_add(crc, c) (yenc_crc_table[(((int) (crc)) ^ ((unsigned char) (c))) & 0xff] ^ ((((int) (crc)) >> 8) & 0x00ffffff)) + +#define YENC_NEWLINE_ESCAPE (CAMEL_MIME_YDECODE_STATE_EOLN | CAMEL_MIME_YDECODE_STATE_ESCAPE) + + +/** + * camel_ydecode_step: + * @in: input buffer + * @inlen: input buffer length + * @out: output buffer + * @state: ydecode state + * @pcrc: part crc state + * @crc: crc state + * + * Performs a 'decode step' on a chunk of yEncoded data of length + * @inlen pointed to by @in and writes to @out. Assumes the =ybegin + * and =ypart lines have already been stripped off. + * + * To get the crc32 value of the part, use CAMEL_MIME_YENCODE_CRC_FINAL + * (@pcrc). If there are more parts, you should reuse @crc without + * re-initializing. Once all parts have been decoded, you may get the + * combined crc32 value of all the parts using CAMEL_MIME_YENCODE_CRC_FINAL + * (@crc). + * + * Returns the number of bytes decoded. + **/ +size_t +camel_ydecode_step (const unsigned char *in, size_t inlen, unsigned char *out, + int *state, guint32 *pcrc, guint32 *crc) +{ + const register unsigned char *inptr; + register unsigned char *outptr; + const unsigned char *inend; + unsigned char ch; + int ystate; + + if (*state & CAMEL_MIME_YDECODE_STATE_END) + return 0; + + ystate = *state; + + inend = in + inlen; + outptr = out; + + inptr = in; + while (inptr < inend) { + ch = *inptr++; + + if ((ystate & YENC_NEWLINE_ESCAPE) == YENC_NEWLINE_ESCAPE) { + ystate &= ~CAMEL_MIME_YDECODE_STATE_EOLN; + + if (ch == 'y') { + /* we probably have a =yend here */ + ystate |= CAMEL_MIME_YDECODE_STATE_END; + break; + } + } + + if (ch == '\n') { + ystate |= CAMEL_MIME_YDECODE_STATE_EOLN; + continue; + } + + if (ystate & CAMEL_MIME_YDECODE_STATE_ESCAPE) { + ystate &= ~CAMEL_MIME_YDECODE_STATE_ESCAPE; + ch -= 64; + } else if (ch == '=') { + ystate |= CAMEL_MIME_YDECODE_STATE_ESCAPE; + continue; + } + + ystate &= ~CAMEL_MIME_YDECODE_STATE_EOLN; + + *outptr++ = ch -= 42; + + *pcrc = yenc_crc_add (*pcrc, ch); + *crc = yenc_crc_add (*crc, ch); + } + + *state = ystate; + + return outptr - out; +} + + +/** + * camel_yencode_step: + * @in: input buffer + * @inlen: input buffer length + * @out: output buffer + * @state: yencode state + * @pcrc: part crc state + * @crc: crc state + * + * Performs an yEncode 'encode step' on a chunk of raw data of length + * @inlen pointed to by @in and writes to @out. + * + * @state should be initialized to CAMEL_MIME_YENCODE_STATE_INIT before + * beginning making the first call to this function. Subsequent calls + * should reuse @state. + * + * Along the same lines, @pcrc and @crc should be initialized to + * CAMEL_MIME_YENCODE_CRC_INIT before using. + * + * Returns the number of bytes encoded. + **/ +size_t +camel_yencode_step (const unsigned char *in, size_t inlen, unsigned char *out, + int *state, guint32 *pcrc, guint32 *crc) +{ + const register unsigned char *inptr; + register unsigned char *outptr; + const unsigned char *inend; + register int already; + unsigned char ch; + + inend = in + inlen; + outptr = out; + + already = *state; + + inptr = in; + while (inptr < inend) { + ch = (*inptr++); + + *pcrc = yenc_crc_add (*pcrc, ch); + *crc = yenc_crc_add (*crc, ch); + + ch += 42; + + if (ch == '\0' || ch == '\t' || ch == '\r' || ch == '\n' || ch == '=') { + *outptr++ = '='; + *outptr++ = ch + 64; + already += 2; + } else { + *outptr++ = ch; + already++; + } + + if (already >= 128) { + *outptr++ = '\n'; + already = 0; + } + } + + *state = already; + + return outptr - out; +} + + +/** + * camel_yencode_close: + * @in: input buffer + * @inlen: input buffer length + * @out: output buffer + * @state: yencode state + * @pcrc: part crc state + * @crc: crc state + * + * Call this function when finished encoding data with + * camel_yencode_step to flush off the remaining state. + * + * CAMEL_MIME_YENCODE_CRC_FINAL (@pcrc) will give you the crc32 of the + * encoded "part". If there are more "parts" to encode, you should + * re-use @crc when encoding the next "parts" and then use + * CAMEL_MIME_YENCODE_CRC_FINAL (@crc) to get the combined crc32 value of + * all the parts. + * + * Returns the number of bytes encoded. + **/ +size_t +camel_yencode_close (const unsigned char *in, size_t inlen, unsigned char *out, + int *state, guint32 *pcrc, guint32 *crc) +{ + register unsigned char *outptr; + + outptr = out; + + if (inlen) + outptr += camel_yencode_step (in, inlen, out, state, pcrc, crc); + + if (*state) + *outptr++ = '\n'; + + *state = CAMEL_MIME_YENCODE_STATE_INIT; + + return outptr - out; +} |