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 34static 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 45static 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 69static 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 89static const uint8_t ccitt_group3_2d_bits[11] = { 90 1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1 91}; 92 93static const uint8_t ccitt_group3_2d_lens[11] = { 94 4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9 95}; 96 97static VLC ccitt_vlc[2], ccitt_group3_2d_vlc; 98 99av_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 126static 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 160static 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 249static 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 267static 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 279int 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_array(runsize, sizeof(runs[0])); 291 ref = av_malloc_array(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; 336fail: 337 av_free(runs); 338 av_free(ref); 339 return ret; 340} 341