| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "libavutil/mem.h" | ||
| 28 | #include "libavutil/thread.h" | ||
| 29 | #include "avcodec.h" | ||
| 30 | #include "get_bits.h" | ||
| 31 | #include "put_bits.h" | ||
| 32 | #include "faxcompr.h" | ||
| 33 | |||
| 34 | #define CCITT_SYMS 104 | ||
| 35 | |||
| 36 | static const uint16_t ccitt_syms[CCITT_SYMS] = { | ||
| 37 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, | ||
| 38 | 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, | ||
| 39 | 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, | ||
| 40 | 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, | ||
| 41 | 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, | ||
| 42 | 128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896, | ||
| 43 | 960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728, | ||
| 44 | 1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560 | ||
| 45 | }; | ||
| 46 | |||
| 47 | static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] = | ||
| 48 | { | ||
| 49 | { | ||
| 50 | 0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08, | ||
| 51 | 0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B, | ||
| 52 | 0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, | ||
| 53 | 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54, | ||
| 54 | 0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B, | ||
| 55 | 0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3, | ||
| 56 | 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B, | ||
| 57 | 0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F | ||
| 58 | }, | ||
| 59 | { | ||
| 60 | 0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07, | ||
| 61 | 0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18, | ||
| 62 | 0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, | ||
| 63 | 0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53, | ||
| 64 | 0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F, | ||
| 65 | 0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72, | ||
| 66 | 0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65, | ||
| 67 | 0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F | ||
| 68 | } | ||
| 69 | }; | ||
| 70 | |||
| 71 | static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] = | ||
| 72 | { | ||
| 73 | { | ||
| 74 | 8, 6, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, | ||
| 75 | 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, | ||
| 76 | 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, | ||
| 77 | 8, 8, 8, 8, 5, 5, 6, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, | ||
| 78 | 9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 9, 11, 11, 11, 12, 12, 12, 12, 12, 12, | ||
| 79 | 12, 12, 12, 12 | ||
| 80 | }, | ||
| 81 | { | ||
| 82 | 10, 3, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 7, 8, 8, 9, 10, 10, 10, 11, | ||
| 83 | 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, | ||
| 84 | 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, | ||
| 85 | 12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, | ||
| 86 | 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12, | ||
| 87 | 12, 12, 12, 12 | ||
| 88 | } | ||
| 89 | }; | ||
| 90 | |||
| 91 | static const uint8_t ccitt_group3_2d_bits[11] = { | ||
| 92 | 1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1 | ||
| 93 | }; | ||
| 94 | |||
| 95 | static const uint8_t ccitt_group3_2d_lens[11] = { | ||
| 96 | 4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9 | ||
| 97 | }; | ||
| 98 | |||
| 99 | // Also contains the other VLC tables pointed to by ccitt_vlc | ||
| 100 | static VLCElem ccitt_group3_2d_vlc[512 + 528 + 648]; | ||
| 101 | static const VLCElem *ccitt_vlc[2]; | ||
| 102 | |||
| 103 | 11 | static av_cold void ccitt_unpack_init(void) | |
| 104 | { | ||
| 105 | 11 | VLCInitState state = VLC_INIT_STATE(ccitt_group3_2d_vlc); | |
| 106 | int i; | ||
| 107 | |||
| 108 | 11 | ff_vlc_init_tables(&state, 9, 11, | |
| 109 | ccitt_group3_2d_lens, 1, 1, | ||
| 110 | ccitt_group3_2d_bits, 1, 1, 0); | ||
| 111 |
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33 | for (i = 0; i < 2; i++) { |
| 112 | 22 | ccitt_vlc[i] = ff_vlc_init_tables_sparse(&state, 9, CCITT_SYMS, | |
| 113 | 22 | ccitt_codes_lens[i], 1, 1, | |
| 114 | 22 | ccitt_codes_bits[i], 1, 1, | |
| 115 | ccitt_syms, 2, 2, 0); | ||
| 116 | } | ||
| 117 | 11 | } | |
| 118 | |||
| 119 | 21 | av_cold void ff_ccitt_unpack_init(void) | |
| 120 | { | ||
| 121 | static AVOnce init_static_once = AV_ONCE_INIT; | ||
| 122 | 21 | ff_thread_once(&init_static_once, ccitt_unpack_init); | |
| 123 | 21 | } | |
| 124 | |||
| 125 | ✗ | static int decode_uncompressed(AVCodecContext *avctx, GetBitContext *gb, | |
| 126 | unsigned int *pix_left, int **runs, | ||
| 127 | const int *runend, int *mode) | ||
| 128 | { | ||
| 129 | ✗ | int eob = 0; | |
| 130 | int newmode; | ||
| 131 | ✗ | int saved_run = 0; | |
| 132 | |||
| 133 | do { | ||
| 134 | int cwi, k; | ||
| 135 | ✗ | int cw = 0; | |
| 136 | int codes[2]; | ||
| 137 | do { | ||
| 138 | ✗ | cwi = show_bits(gb, 11); | |
| 139 | ✗ | if (!cwi) { | |
| 140 | ✗ | av_log(avctx, AV_LOG_ERROR, "Invalid uncompressed codeword\n"); | |
| 141 | ✗ | return AVERROR_INVALIDDATA; | |
| 142 | } | ||
| 143 | ✗ | cwi = 10 - av_log2(cwi); | |
| 144 | ✗ | if (get_bits_left(gb) < cwi + 1) | |
| 145 | ✗ | return AVERROR_INVALIDDATA; | |
| 146 | ✗ | skip_bits(gb, cwi + 1); | |
| 147 | ✗ | if (cwi > 5) { | |
| 148 | ✗ | newmode = get_bits1(gb); | |
| 149 | ✗ | eob = 1; | |
| 150 | ✗ | cwi -= 6; | |
| 151 | } | ||
| 152 | ✗ | cw += cwi; | |
| 153 | ✗ | } while(cwi == 5); | |
| 154 | |||
| 155 | ✗ | codes[0] = cw; | |
| 156 | ✗ | codes[1] = !eob; | |
| 157 | |||
| 158 | ✗ | for (k = 0; k < 2; k++) { | |
| 159 | ✗ | if (codes[k]) { | |
| 160 | ✗ | if (*mode == !k) { | |
| 161 | ✗ | *(*runs)++ = saved_run; | |
| 162 | ✗ | if (*runs >= runend) { | |
| 163 | ✗ | av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n"); | |
| 164 | ✗ | return AVERROR_INVALIDDATA; | |
| 165 | } | ||
| 166 | ✗ | if (*pix_left <= saved_run) { | |
| 167 | ✗ | av_log(avctx, AV_LOG_ERROR, "uncompressed run went out of bounds\n"); | |
| 168 | ✗ | return AVERROR_INVALIDDATA; | |
| 169 | } | ||
| 170 | ✗ | *pix_left -= saved_run; | |
| 171 | ✗ | saved_run = 0; | |
| 172 | ✗ | *mode = !*mode; | |
| 173 | } | ||
| 174 | ✗ | saved_run += codes[k]; | |
| 175 | } | ||
| 176 | } | ||
| 177 | ✗ | } while (!eob); | |
| 178 | ✗ | *(*runs)++ = saved_run; | |
| 179 | ✗ | if (*runs >= runend) { | |
| 180 | ✗ | av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n"); | |
| 181 | ✗ | return AVERROR_INVALIDDATA; | |
| 182 | } | ||
| 183 | ✗ | if (*pix_left <= saved_run) { | |
| 184 | ✗ | if (*pix_left == saved_run) | |
| 185 | ✗ | return 1; | |
| 186 | ✗ | av_log(avctx, AV_LOG_ERROR, "uncompressed run went out of boundsE\n"); | |
| 187 | ✗ | return AVERROR_INVALIDDATA; | |
| 188 | } | ||
| 189 | ✗ | *pix_left -= saved_run; | |
| 190 | ✗ | saved_run = 0; | |
| 191 | ✗ | *mode = !*mode; | |
| 192 | ✗ | if (newmode != *mode) { //FIXME CHECK | |
| 193 | ✗ | *(*runs)++ = 0; | |
| 194 | ✗ | if (*runs >= runend) { | |
| 195 | ✗ | av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n"); | |
| 196 | ✗ | return AVERROR_INVALIDDATA; | |
| 197 | } | ||
| 198 | ✗ | *mode = newmode; | |
| 199 | } | ||
| 200 | ✗ | return 0; | |
| 201 | } | ||
| 202 | |||
| 203 | 6496 | static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb, | |
| 204 | unsigned int pix_left, int *runs, | ||
| 205 | const int *runend) | ||
| 206 | { | ||
| 207 | 6496 | int mode = 0; | |
| 208 | 6496 | unsigned int run = 0; | |
| 209 | unsigned int t; | ||
| 210 | for (;;) { | ||
| 211 |
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377768 | if (get_bits_left(gb) <= 0) |
| 212 | ✗ | return AVERROR_INVALIDDATA; | |
| 213 | 377768 | t = get_vlc2(gb, ccitt_vlc[mode], 9, 2); | |
| 214 | 377768 | run += t; | |
| 215 |
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377768 | if (t < 64) { |
| 216 | 331528 | *runs++ = run; | |
| 217 |
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331528 | if (runs >= runend) { |
| 218 | ✗ | av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); | |
| 219 | ✗ | return AVERROR_INVALIDDATA; | |
| 220 | } | ||
| 221 |
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331528 | if (pix_left <= run) { |
| 222 |
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6496 | if (pix_left == run) |
| 223 | 6496 | break; | |
| 224 | ✗ | av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); | |
| 225 | ✗ | return AVERROR_INVALIDDATA; | |
| 226 | } | ||
| 227 | 325032 | pix_left -= run; | |
| 228 | 325032 | run = 0; | |
| 229 | 325032 | mode = !mode; | |
| 230 |
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46240 | } else if ((int)t == -1) { |
| 231 | ✗ | if (get_bits_left(gb) > 12 && show_bits(gb, 12) == 15) { | |
| 232 | int ret; | ||
| 233 | ✗ | skip_bits(gb, 12); | |
| 234 | ✗ | ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode); | |
| 235 | ✗ | if (ret < 0) { | |
| 236 | ✗ | return ret; | |
| 237 | ✗ | } else if (ret) | |
| 238 | ✗ | break; | |
| 239 | } else { | ||
| 240 | ✗ | av_log(avctx, AV_LOG_ERROR, "Incorrect code\n"); | |
| 241 | ✗ | return AVERROR_INVALIDDATA; | |
| 242 | } | ||
| 243 | } | ||
| 244 | } | ||
| 245 | 6496 | *runs++ = 0; | |
| 246 | 6496 | return 0; | |
| 247 | } | ||
| 248 | |||
| 249 | ✗ | static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb, | |
| 250 | unsigned int width, int *runs, | ||
| 251 | const int *runend, const int *ref) | ||
| 252 | { | ||
| 253 | ✗ | int mode = 0, saved_run = 0, t; | |
| 254 | ✗ | int run_off = *ref++; | |
| 255 | ✗ | unsigned int offs = 0, run = 0; | |
| 256 | |||
| 257 | ✗ | while (offs < width) { | |
| 258 | int cmode; | ||
| 259 | ✗ | if (get_bits_left(gb) <= 0) | |
| 260 | ✗ | return AVERROR_INVALIDDATA; | |
| 261 | ✗ | cmode = get_vlc2(gb, ccitt_group3_2d_vlc, 9, 1); | |
| 262 | ✗ | if (cmode == -1) { | |
| 263 | ✗ | av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n"); | |
| 264 | ✗ | return AVERROR_INVALIDDATA; | |
| 265 | } | ||
| 266 | ✗ | if (!cmode) { //pass mode | |
| 267 | ✗ | if (run_off < width) | |
| 268 | ✗ | run_off += *ref++; | |
| 269 | ✗ | run = run_off - offs; | |
| 270 | ✗ | offs = run_off; | |
| 271 | ✗ | if (run_off < width) | |
| 272 | ✗ | run_off += *ref++; | |
| 273 | ✗ | if (offs > width) { | |
| 274 | ✗ | av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); | |
| 275 | ✗ | return AVERROR_INVALIDDATA; | |
| 276 | } | ||
| 277 | ✗ | saved_run += run; | |
| 278 | ✗ | } else if (cmode == 1) { //horizontal mode | |
| 279 | int k; | ||
| 280 | ✗ | for (k = 0; k < 2; k++) { | |
| 281 | ✗ | run = 0; | |
| 282 | for (;;) { | ||
| 283 | ✗ | if (get_bits_left(gb) <= 0) | |
| 284 | ✗ | return AVERROR_INVALIDDATA; | |
| 285 | ✗ | t = get_vlc2(gb, ccitt_vlc[mode], 9, 2); | |
| 286 | ✗ | if (t == -1) { | |
| 287 | ✗ | av_log(avctx, AV_LOG_ERROR, "Incorrect code\n"); | |
| 288 | ✗ | return AVERROR_INVALIDDATA; | |
| 289 | } | ||
| 290 | ✗ | run += t; | |
| 291 | ✗ | if (t < 64) | |
| 292 | ✗ | break; | |
| 293 | } | ||
| 294 | ✗ | *runs++ = run + saved_run; | |
| 295 | ✗ | if (runs >= runend) { | |
| 296 | ✗ | av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); | |
| 297 | ✗ | return AVERROR_INVALIDDATA; | |
| 298 | } | ||
| 299 | ✗ | saved_run = 0; | |
| 300 | ✗ | offs += run; | |
| 301 | ✗ | if (offs > width || run > width) { | |
| 302 | ✗ | av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); | |
| 303 | ✗ | return AVERROR_INVALIDDATA; | |
| 304 | } | ||
| 305 | ✗ | mode = !mode; | |
| 306 | } | ||
| 307 | ✗ | } else if (cmode == 9 || cmode == 10) { | |
| 308 | int xxx; | ||
| 309 | ✗ | if (get_bits_left(gb) < 3) | |
| 310 | ✗ | return AVERROR_INVALIDDATA; | |
| 311 | ✗ | xxx = get_bits(gb, 3); | |
| 312 | ✗ | if (cmode == 9 && xxx == 7) { | |
| 313 | int ret; | ||
| 314 | ✗ | int pix_left = width - offs; | |
| 315 | |||
| 316 | ✗ | if (saved_run) { | |
| 317 | ✗ | av_log(avctx, AV_LOG_ERROR, "saved run %d on entering uncompressed mode\n", saved_run); | |
| 318 | ✗ | return AVERROR_INVALIDDATA; | |
| 319 | } | ||
| 320 | ✗ | ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode); | |
| 321 | ✗ | offs = width - pix_left; | |
| 322 | ✗ | if (ret < 0) { | |
| 323 | ✗ | return ret; | |
| 324 | ✗ | } else if (ret) | |
| 325 | ✗ | break; | |
| 326 | } else { | ||
| 327 | ✗ | avpriv_report_missing_feature(avctx, "Special mode %d xxx=%d support", cmode, xxx); | |
| 328 | ✗ | return AVERROR_PATCHWELCOME; | |
| 329 | } | ||
| 330 | } else { //vertical mode | ||
| 331 | ✗ | run = run_off - offs + (cmode - 5); | |
| 332 | ✗ | run_off -= *--ref; | |
| 333 | ✗ | offs += run; | |
| 334 | ✗ | if (offs > width || run > width) { | |
| 335 | ✗ | av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); | |
| 336 | ✗ | return AVERROR_INVALIDDATA; | |
| 337 | } | ||
| 338 | ✗ | *runs++ = run + saved_run; | |
| 339 | ✗ | if (runs >= runend) { | |
| 340 | ✗ | av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); | |
| 341 | ✗ | return AVERROR_INVALIDDATA; | |
| 342 | } | ||
| 343 | ✗ | saved_run = 0; | |
| 344 | ✗ | mode = !mode; | |
| 345 | } | ||
| 346 | //sync line pointers | ||
| 347 | ✗ | while (offs < width && run_off <= offs) { | |
| 348 | ✗ | run_off += *ref++; | |
| 349 | ✗ | run_off += *ref++; | |
| 350 | } | ||
| 351 | } | ||
| 352 | ✗ | *runs++ = saved_run; | |
| 353 | ✗ | if (saved_run) { | |
| 354 | ✗ | if (runs >= runend) { | |
| 355 | ✗ | av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); | |
| 356 | ✗ | return -1; | |
| 357 | } | ||
| 358 | ✗ | *runs++ = 0; | |
| 359 | } | ||
| 360 | ✗ | return 0; | |
| 361 | } | ||
| 362 | |||
| 363 | 6496 | static void put_line(uint8_t *dst, int size, int width, const int *runs) | |
| 364 | { | ||
| 365 | PutBitContext pb; | ||
| 366 | 6496 | int run, mode = ~0, pix_left = width, run_idx = 0; | |
| 367 | |||
| 368 | 6496 | init_put_bits(&pb, dst, size); | |
| 369 |
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338024 | while (pix_left > 0) { |
| 370 | 331528 | run = runs[run_idx++]; | |
| 371 | 331528 | mode = ~mode; | |
| 372 | 331528 | pix_left -= run; | |
| 373 |
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1232684 | for (; run > 16; run -= 16) |
| 374 | 901156 | put_sbits(&pb, 16, mode); | |
| 375 |
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331528 | if (run) |
| 376 | 331528 | put_sbits(&pb, run, mode); | |
| 377 | } | ||
| 378 | 6496 | flush_put_bits(&pb); | |
| 379 | 6496 | } | |
| 380 | |||
| 381 | 6496 | static int find_group3_syncmarker(GetBitContext *gb, int srcsize) | |
| 382 | { | ||
| 383 | 6496 | unsigned int state = -1; | |
| 384 | 6496 | srcsize -= get_bits_count(gb); | |
| 385 |
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77952 | while (srcsize-- > 0) { |
| 386 | 77952 | state += state + get_bits1(gb); | |
| 387 |
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77952 | if ((state & 0xFFF) == 1) |
| 388 | 6496 | return 0; | |
| 389 | } | ||
| 390 | ✗ | return -1; | |
| 391 | } | ||
| 392 | |||
| 393 | 18 | int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize, | |
| 394 | uint8_t *dst, int height, int stride, | ||
| 395 | enum TiffCompr compr, int opts) | ||
| 396 | { | ||
| 397 | int j; | ||
| 398 | GetBitContext gb; | ||
| 399 | 18 | int *runs, *ref = NULL, *runend; | |
| 400 | int ret; | ||
| 401 | 18 | int runsize = avctx->width + 2; | |
| 402 | int has_eol; | ||
| 403 | |||
| 404 | 18 | runs = av_malloc_array(runsize, sizeof(runs[0])); | |
| 405 | 18 | ref = av_malloc_array(runsize, sizeof(ref[0])); | |
| 406 |
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18 | if (!runs || !ref) { |
| 407 | ✗ | ret = AVERROR(ENOMEM); | |
| 408 | ✗ | goto fail; | |
| 409 | } | ||
| 410 | 18 | ref[0] = avctx->width; | |
| 411 | 18 | ref[1] = 0; | |
| 412 | 18 | ref[2] = 0; | |
| 413 |
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18 | if ((ret = init_get_bits8(&gb, src, srcsize)) < 0) |
| 414 | ✗ | goto fail; | |
| 415 |
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18 | has_eol = show_bits(&gb, 12) == 1 || show_bits(&gb, 16) == 1; |
| 416 | |||
| 417 |
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6514 | for (j = 0; j < height; j++) { |
| 418 | 6496 | runend = runs + runsize; | |
| 419 |
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6496 | if (compr == TIFF_G4) { |
| 420 | ✗ | ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, | |
| 421 | ref); | ||
| 422 | ✗ | if (ret < 0) | |
| 423 | ✗ | goto fail; | |
| 424 | } else { | ||
| 425 |
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6496 | int g3d1 = (compr == TIFF_G3) && !(opts & 1); |
| 426 |
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6496 | if (compr != TIFF_CCITT_RLE && |
| 427 |
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6496 | has_eol && |
| 428 | 6496 | find_group3_syncmarker(&gb, srcsize * 8) < 0) | |
| 429 | ✗ | break; | |
| 430 |
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6496 | if (compr == TIFF_CCITT_RLE || g3d1 || get_bits1(&gb)) |
| 431 | 6496 | ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs, | |
| 432 | runend); | ||
| 433 | else | ||
| 434 | ✗ | ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, | |
| 435 | runend, ref); | ||
| 436 |
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6496 | if (compr == TIFF_CCITT_RLE) |
| 437 | ✗ | align_get_bits(&gb); | |
| 438 | } | ||
| 439 |
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6496 | if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0) |
| 440 | ✗ | goto fail; | |
| 441 | |||
| 442 |
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6496 | if (ret < 0) { |
| 443 | ✗ | put_line(dst, stride, avctx->width, ref); | |
| 444 | } else { | ||
| 445 | 6496 | put_line(dst, stride, avctx->width, runs); | |
| 446 | 6496 | FFSWAP(int *, runs, ref); | |
| 447 | } | ||
| 448 | 6496 | dst += stride; | |
| 449 | } | ||
| 450 | 18 | ret = 0; | |
| 451 | 18 | fail: | |
| 452 | 18 | av_free(runs); | |
| 453 | 18 | av_free(ref); | |
| 454 | 18 | return ret; | |
| 455 | } | ||
| 456 |