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FFmpeg/libavcodec/faxcompr.c

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  1. /*

  2.  * CCITT Fax Group 3 and 4 decompression

  3.  * Copyright (c) 2008 Konstantin Shishkov

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * Libav is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * CCITT Fax Group 3 and 4 decompression

  25.  * @author Konstantin Shishkov

  26.  */

  27. #include "avcodec.h"

  28. #include "bitstream.h"

  29. #include "put_bits.h"

  30. #include "faxcompr.h"

  31. 

  32. #define CCITT_SYMS 104

  33. 

  34. static const uint16_t ccitt_syms[CCITT_SYMS] = {

  35.     0,    1,    2,    3,    4,    5,    6,    7,    8,    9,   10,   11,   12,

  36.    13,   14,   15,   16,   17,   18,   19,   20,   21,   22,   23,   24,   25,

  37.    26,   27,   28,   29,   30,   31,   32,   33,   34,   35,   36,   37,   38,

  38.    39,   40,   41,   42,   43,   44,   45,   46,   47,   48,   49,   50,   51,

  39.    52,   53,   54,   55,   56,   57,   58,   59,   60,   61,   62,   63,   64,

  40.   128,  192,  256,  320,  384,  448,  512,  576,  640,  704,  768,  832,  896,

  41.   960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,

  42.  1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560

  43. };

  44. 

  45. static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =

  46. {

  47.   {

  48.     0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,

  49.     0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,

  50.     0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,

  51.     0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,

  52.     0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,

  53.     0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,

  54.     0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,

  55.     0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F

  56.   },

  57.   {

  58.     0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,

  59.     0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,

  60.     0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,

  61.     0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,

  62.     0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,

  63.     0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,

  64.     0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,

  65.     0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F

  66.   }

  67. };

  68. 

  69. static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =

  70. {

  71.   {

  72.      8,  6,  4,  4,  4,  4,  4,  4,  5,  5,  5,  5,  6,  6,  6,  6,  6,  6,  7,  7,

  73.      7,  7,  7,  7,  7,  7,  7,  7,  7,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,

  74.      8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,

  75.      8,  8,  8,  8,  5,  5,  6,  7,  8,  8,  8,  8,  8,  8,  9,  9,  9,  9,  9,  9,

  76.      9,  9,  9,  9,  9,  9,  9,  9,  9,  6,  9, 11, 11, 11, 12, 12, 12, 12, 12, 12,

  77.     12, 12, 12, 12

  78.   },

  79.   {

  80.     10,  3,  2,  2,  3,  4,  4,  5,  6,  6,  7,  7,  7,  8,  8,  9, 10, 10, 10, 11,

  81.     11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,

  82.     12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,

  83.     12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,

  84.     13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,

  85.     12, 12, 12, 12

  86.   }

  87. };

  88. 

  89. static const uint8_t ccitt_group3_2d_bits[11] = {

  90.     1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1

  91. };

  92. 

  93. static const uint8_t ccitt_group3_2d_lens[11] = {

  94.     4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9

  95. };

  96. 

  97. static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;

  98. 

  99. av_cold void ff_ccitt_unpack_init(void)

  100. {

  101.     static VLC_TYPE code_table1[528][2];

  102.     static VLC_TYPE code_table2[648][2];

  103.     int i;

  104.     static int initialized = 0;

  105. 

  106.     if (initialized)

  107.         return;

  108.     ccitt_vlc[0].table = code_table1;

  109.     ccitt_vlc[0].table_allocated = 528;

  110.     ccitt_vlc[1].table = code_table2;

  111.     ccitt_vlc[1].table_allocated = 648;

  112.     for (i = 0; i < 2; i++) {

  113.         ff_init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,

  114.                            ccitt_codes_lens[i], 1, 1,

  115.                            ccitt_codes_bits[i], 1, 1,

  116.                            ccitt_syms, 2, 2,

  117.                            INIT_VLC_USE_NEW_STATIC);

  118.     }

  119.     INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,

  120.                     ccitt_group3_2d_lens, 1, 1,

  121.                     ccitt_group3_2d_bits, 1, 1, 512);

  122.     initialized = 1;

  123. }

  124. 

  125. 

  126. static int decode_group3_1d_line(AVCodecContext *avctx, BitstreamContext *bc,

  127.                                  unsigned int pix_left, int *runs,

  128.                                  const int *runend)

  129. {

  130.     int mode         = 0;

  131.     unsigned int run = 0;

  132.     unsigned int t;

  133.     for (;;) {

  134.         t    = bitstream_read_vlc(bc, ccitt_vlc[mode].table, 9, 2);

  135.         run += t;

  136.         if (t < 64) {

  137.             *runs++ = run;

  138.             if (runs >= runend) {

  139.                 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");

  140.                 return AVERROR_INVALIDDATA;

  141.             }

  142.             if (pix_left <= run) {

  143.                 if (pix_left == run)

  144.                     break;

  145.                 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

  146.                 return AVERROR_INVALIDDATA;

  147.             }

  148.             pix_left -= run;

  149.             run       = 0;

  150.             mode      = !mode;

  151.         } else if ((int)t == -1) {

  152.             av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");

  153.             return AVERROR_INVALIDDATA;

  154.         }

  155.     }

  156.     *runs++ = 0;

  157.     return 0;

  158. }

  159. 

  160. static int decode_group3_2d_line(AVCodecContext *avctx, BitstreamContext *bc,

  161.                                  unsigned int width, int *runs,

  162.                                  const int *runend, const int *ref)

  163. {

  164.     int mode          = 0, saved_run = 0, t;

  165.     int run_off       = *ref++;

  166.     unsigned int offs = 0, run = 0;

  167. 

  168.     runend--; // for the last written 0

  169. 

  170.     while (offs < width) {

  171.         int cmode = bitstream_read_vlc(bc, ccitt_group3_2d_vlc.table, 9, 1);

  172.         if (cmode == -1) {

  173.             av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");

  174.             return AVERROR_INVALIDDATA;

  175.         }

  176.         if (!cmode) { //pass mode

  177.             run_off += *ref++;

  178.             run      = run_off - offs;

  179.             offs     = run_off;

  180.             run_off += *ref++;

  181.             if (offs > width) {

  182.                 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

  183.                 return AVERROR_INVALIDDATA;

  184.             }

  185.             saved_run += run;

  186.         } else if (cmode == 1) { //horizontal mode

  187.             int k;

  188.             for (k = 0; k < 2; k++) {

  189.                 run = 0;

  190.                 for (;;) {

  191.                     t = bitstream_read_vlc(bc, ccitt_vlc[mode].table, 9, 2);

  192.                     if (t == -1) {

  193.                         av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");

  194.                         return AVERROR_INVALIDDATA;

  195.                     }

  196.                     run += t;

  197.                     if (t < 64)

  198.                         break;

  199.                 }

  200.                 *runs++ = run + saved_run;

  201.                 if (runs >= runend) {

  202.                     av_log(avctx, AV_LOG_ERROR, "Run overrun\n");

  203.                     return AVERROR_INVALIDDATA;

  204.                 }

  205.                 saved_run = 0;

  206.                 offs     += run;

  207.                 if (offs > width || run > width) {

  208.                     av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

  209.                     return AVERROR_INVALIDDATA;

  210.                 }

  211.                 mode = !mode;

  212.             }

  213.         } else if (cmode == 9 || cmode == 10) {

  214.             avpriv_report_missing_feature(avctx, "Special modes support");

  215.             return AVERROR_PATCHWELCOME;

  216.         } else { //vertical mode

  217.             run      = run_off - offs + (cmode - 5);

  218.             run_off -= *--ref;

  219.             offs    += run;

  220.             if (offs > width || run > width) {

  221.                 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");

  222.                 return AVERROR_INVALIDDATA;

  223.             }

  224.             *runs++ = run + saved_run;

  225.             if (runs >= runend) {

  226.                 av_log(avctx, AV_LOG_ERROR, "Run overrun\n");

  227.                 return AVERROR_INVALIDDATA;

  228.             }

  229.             saved_run = 0;

  230.             mode      = !mode;

  231.         }

  232.         //sync line pointers

  233.         while (run_off <= offs) {

  234.             run_off += *ref++;

  235.             run_off += *ref++;

  236.         }

  237.     }

  238.     *runs++ = saved_run;

  239.     *runs++ = 0;

  240.     return 0;

  241. }

  242. 

  243. static void put_line(uint8_t *dst, int size, int width, const int *runs)

  244. {

  245.     PutBitContext pb;

  246.     int run, mode = ~0, pix_left = width, run_idx = 0;

  247. 

  248.     init_put_bits(&pb, dst, size * 8);

  249.     while (pix_left > 0) {

  250.         run       = runs[run_idx++];

  251.         mode      = ~mode;

  252.         pix_left -= run;

  253.         for (; run > 16; run -= 16)

  254.             put_sbits(&pb, 16, mode);

  255.         if (run)

  256.             put_sbits(&pb, run, mode);

  257.     }

  258.     flush_put_bits(&pb);

  259. }

  260. 

  261. static int find_group3_syncmarker(BitstreamContext *bc, int srcsize)

  262. {

  263.     unsigned int state = -1;

  264.     srcsize -= bitstream_tell(bc);

  265.     while (srcsize-- > 0) {

  266.         state += state + bitstream_read_bit(bc);

  267.         if ((state & 0xFFF) == 1)

  268.             return 0;

  269.     }

  270.     return -1;

  271. }

  272. 

  273. int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize,

  274.                     uint8_t *dst, int height, int stride,

  275.                     enum TiffCompr compr, int opts)

  276. {

  277.     int j;

  278.     BitstreamContext bc;

  279.     int *runs, *ref = NULL, *runend;

  280.     int ret;

  281.     int runsize = avctx->width + 2;

  282. 

  283.     runs = av_malloc(runsize * sizeof(runs[0]));

  284.     ref  = av_malloc(runsize * sizeof(ref[0]));

  285.     if (!runs || !ref) {

  286.         ret = AVERROR(ENOMEM);

  287.         goto fail;

  288.     }

  289.     ref[0] = avctx->width;

  290.     ref[1] = 0;

  291.     ref[2] = 0;

  292.     bitstream_init8(&bc, src, srcsize);

  293.     for (j = 0; j < height; j++) {

  294.         runend = runs + runsize;

  295.         if (compr == TIFF_G4) {

  296.             ret = decode_group3_2d_line(avctx, &bc, avctx->width, runs, runend,

  297.                                         ref);

  298.             if (ret < 0)

  299.                 goto fail;

  300.         } else {

  301.             int g3d1 = (compr == TIFF_G3) && !(opts & 1);

  302.             if (compr != TIFF_CCITT_RLE &&

  303.                 find_group3_syncmarker(&bc, srcsize * 8) < 0)

  304.                 break;

  305.             if (compr == TIFF_CCITT_RLE || g3d1 || bitstream_read_bit(&bc))

  306.                 ret = decode_group3_1d_line(avctx, &bc, avctx->width, runs,

  307.                                             runend);

  308.             else

  309.                 ret = decode_group3_2d_line(avctx, &bc, avctx->width, runs,

  310.                                             runend, ref);

  311.             if (compr == TIFF_CCITT_RLE)

  312.                 bitstream_align(&bc);

  313.         }

  314.         if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0)

  315.             goto fail;

  316. 

  317.         if (ret < 0) {

  318.             put_line(dst, stride, avctx->width, ref);

  319.         } else {

  320.             put_line(dst, stride, avctx->width, runs);

  321.             FFSWAP(int *, runs, ref);

  322.         }

  323.         dst += stride;

  324.     }

  325.     ret = 0;

  326. fail:

  327.     av_free(runs);

  328.     av_free(ref);

  329.     return ret;

  330. }