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 * CCITT Fax Group 3 and 4 decompression 24 * @file 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 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, const int *runend) 128{ 129 int mode = 0; 130 unsigned int run=0; 131 unsigned int t; 132 for(;;){ 133 t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); 134 run += t; 135 if(t < 64){ 136 *runs++ = run; 137 if(runs >= runend){ 138 av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); 139 return -1; 140 } 141 if(pix_left <= run){ 142 if(pix_left == run) 143 break; 144 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); 145 return -1; 146 } 147 pix_left -= run; 148 run = 0; 149 mode = !mode; 150 }else if((int)t == -1){ 151 av_log(avctx, AV_LOG_ERROR, "Incorrect code\n"); 152 return -1; 153 } 154 } 155 *runs++ = 0; 156 return 0; 157} 158 159static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb, 160 unsigned int width, int *runs, const int *runend, const int *ref) 161{ 162 int mode = 0, saved_run = 0, t; 163 int run_off = *ref++; 164 unsigned int offs=0, run= 0; 165 166 runend--; // for the last written 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 -1; 173 } 174 if(!cmode){//pass mode 175 run_off += *ref++; 176 run = run_off - offs; 177 offs= run_off; 178 run_off += *ref++; 179 if(offs > width){ 180 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); 181 return -1; 182 } 183 saved_run += run; 184 }else if(cmode == 1){//horizontal mode 185 int k; 186 for(k = 0; k < 2; k++){ 187 run = 0; 188 for(;;){ 189 t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); 190 if(t == -1){ 191 av_log(avctx, AV_LOG_ERROR, "Incorrect code\n"); 192 return -1; 193 } 194 run += t; 195 if(t < 64) 196 break; 197 } 198 *runs++ = run + saved_run; 199 if(runs >= runend){ 200 av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); 201 return -1; 202 } 203 saved_run = 0; 204 offs += run; 205 if(offs > width || run > width){ 206 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); 207 return -1; 208 } 209 mode = !mode; 210 } 211 }else if(cmode == 9 || cmode == 10){ 212 av_log(avctx, AV_LOG_ERROR, "Special modes are not supported (yet)\n"); 213 return -1; 214 }else{//vertical mode 215 run = run_off - offs + (cmode - 5); 216 run_off -= *--ref; 217 offs += run; 218 if(offs > width || run > width){ 219 av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); 220 return -1; 221 } 222 *runs++ = run + saved_run; 223 if(runs >= runend){ 224 av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); 225 return -1; 226 } 227 saved_run = 0; 228 mode = !mode; 229 } 230 //sync line pointers 231 while(run_off <= offs){ 232 run_off += *ref++; 233 run_off += *ref++; 234 } 235 } 236 *runs++ = saved_run; 237 *runs++ = 0; 238 return 0; 239} 240 241static void put_line(uint8_t *dst, int size, int width, const int *runs) 242{ 243 PutBitContext pb; 244 int run, mode = ~0, pix_left = width, run_idx = 0; 245 246 init_put_bits(&pb, dst, size*8); 247 while(pix_left > 0){ 248 run = runs[run_idx++]; 249 mode = ~mode; 250 pix_left -= run; 251 for(; run > 16; run -= 16) 252 put_sbits(&pb, 16, mode); 253 if(run) 254 put_sbits(&pb, run, mode); 255 } 256 flush_put_bits(&pb); 257} 258 259static int find_group3_syncmarker(GetBitContext *gb, int srcsize) 260{ 261 unsigned int state = -1; 262 srcsize -= get_bits_count(gb); 263 while(srcsize-- > 0){ 264 state+= state + get_bits1(gb); 265 if((state & 0xFFF) == 1) 266 return 0; 267 } 268 return -1; 269} 270 271int ff_ccitt_unpack(AVCodecContext *avctx, 272 const uint8_t *src, int srcsize, 273 uint8_t *dst, int height, int stride, 274 enum TiffCompr compr, int opts) 275{ 276 int j; 277 GetBitContext gb; 278 int *runs, *ref, *runend; 279 int ret; 280 int runsize= avctx->width + 2; 281 282 runs = av_malloc(runsize * sizeof(runs[0])); 283 ref = av_malloc(runsize * sizeof(ref[0])); 284 ref[0] = avctx->width; 285 ref[1] = 0; 286 ref[2] = 0; 287 init_get_bits(&gb, src, srcsize*8); 288 for(j = 0; j < height; j++){ 289 runend = runs + runsize; 290 if(compr == TIFF_G4){ 291 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref); 292 if(ret < 0){ 293 av_free(runs); 294 av_free(ref); 295 return -1; 296 } 297 }else{ 298 int g3d1 = (compr == TIFF_G3) && !(opts & 1); 299 if(compr!=TIFF_CCITT_RLE && find_group3_syncmarker(&gb, srcsize*8) < 0) 300 break; 301 if(compr==TIFF_CCITT_RLE || g3d1 || get_bits1(&gb)) 302 ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs, runend); 303 else 304 ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref); 305 if(compr==TIFF_CCITT_RLE) 306 align_get_bits(&gb); 307 } 308 if(ret < 0){ 309 put_line(dst, stride, avctx->width, ref); 310 }else{ 311 put_line(dst, stride, avctx->width, runs); 312 FFSWAP(int*, runs, ref); 313 } 314 dst += stride; 315 } 316 av_free(runs); 317 av_free(ref); 318 return 0; 319} 320