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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 FFmpeg.
  6.  *
  7.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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 "get_bits.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, GetBitContext *gb,
  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    = get_vlc2(gb, 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, GetBitContext *gb,
  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.     while (offs < width) {
  169.         int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
  170.         if (cmode == -1) {
  171.             av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
  172.             return AVERROR_INVALIDDATA;
  173.         }
  174.         if (!cmode) { //pass mode
  175.             if (run_off < width)
  176.                 run_off += *ref++;
  177.             run      = run_off - offs;
  178.             offs     = run_off;
  179.             if (run_off < width)
  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 = get_vlc2(gb, 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 (offs < width && run_off <= offs) {
  234.             run_off += *ref++;
  235.             run_off += *ref++;
  236.         }
  237.     }
  238.     *runs++ = saved_run;
  239.     if (saved_run) {
  240.         if (runs >= runend) {
  241.             av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
  242.             return -1;
  243.         }
  244.         *runs++ = 0;
  245.     }
  246.     return 0;
  247. }
  248.  
  249. static void put_line(uint8_t *dst, int size, int width, const int *runs)
  250. {
  251.     PutBitContext pb;
  252.     int run, mode = ~0, pix_left = width, run_idx = 0;
  253.  
  254.     init_put_bits(&pb, dst, size * 8);
  255.     while (pix_left > 0) {
  256.         run       = runs[run_idx++];
  257.         mode      = ~mode;
  258.         pix_left -= run;
  259.         for (; run > 16; run -= 16)
  260.             put_sbits(&pb, 16, mode);
  261.         if (run)
  262.             put_sbits(&pb, run, mode);
  263.     }
  264.     flush_put_bits(&pb);
  265. }
  266.  
  267. static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
  268. {
  269.     unsigned int state = -1;
  270.     srcsize -= get_bits_count(gb);
  271.     while (srcsize-- > 0) {
  272.         state += state + get_bits1(gb);
  273.         if ((state & 0xFFF) == 1)
  274.             return 0;
  275.     }
  276.     return -1;
  277. }
  278.  
  279. int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize,
  280.                     uint8_t *dst, int height, int stride,
  281.                     enum TiffCompr compr, int opts)
  282. {
  283.     int j;
  284.     GetBitContext gb;
  285.     int *runs, *ref = NULL, *runend;
  286.     int ret;
  287.     int runsize = avctx->width + 2;
  288.     int has_eol;
  289.  
  290.     runs = av_malloc(runsize * sizeof(runs[0]));
  291.     ref  = av_malloc(runsize * sizeof(ref[0]));
  292.     if (!runs || !ref) {
  293.         ret = AVERROR(ENOMEM);
  294.         goto fail;
  295.     }
  296.     ref[0] = avctx->width;
  297.     ref[1] = 0;
  298.     ref[2] = 0;
  299.     init_get_bits(&gb, src, srcsize * 8);
  300.     has_eol = show_bits(&gb, 12) == 1 || show_bits(&gb, 16) == 1;
  301.  
  302.     for (j = 0; j < height; j++) {
  303.         runend = runs + runsize;
  304.         if (compr == TIFF_G4) {
  305.             ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend,
  306.                                         ref);
  307.             if (ret < 0)
  308.                 goto fail;
  309.         } else {
  310.             int g3d1 = (compr == TIFF_G3) && !(opts & 1);
  311.             if (compr != TIFF_CCITT_RLE &&
  312.                 has_eol &&
  313.                 find_group3_syncmarker(&gb, srcsize * 8) < 0)
  314.                 break;
  315.             if (compr == TIFF_CCITT_RLE || g3d1 || get_bits1(&gb))
  316.                 ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs,
  317.                                             runend);
  318.             else
  319.                 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs,
  320.                                             runend, ref);
  321.             if (compr == TIFF_CCITT_RLE)
  322.                 align_get_bits(&gb);
  323.         }
  324.         if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0)
  325.             goto fail;
  326.  
  327.         if (ret < 0) {
  328.             put_line(dst, stride, avctx->width, ref);
  329.         } else {
  330.             put_line(dst, stride, avctx->width, runs);
  331.             FFSWAP(int *, runs, ref);
  332.         }
  333.         dst += stride;
  334.     }
  335.     ret = 0;
  336. fail:
  337.     av_free(runs);
  338.     av_free(ref);
  339.     return ret;
  340. }
  341.