GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/faxcompr.c Lines: 81 235 34.5 %
Date: 2019-11-18 18:00:01 Branches: 36 152 23.7 %

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 "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
9
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
9
    if (initialized)
107
4
        return;
108
5
    ccitt_vlc[0].table = code_table1;
109
5
    ccitt_vlc[0].table_allocated = 528;
110
5
    ccitt_vlc[1].table = code_table2;
111
5
    ccitt_vlc[1].table_allocated = 648;
112
15
    for (i = 0; i < 2; i++) {
113
10
        ff_init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,
114
10
                           ccitt_codes_lens[i], 1, 1,
115
10
                           ccitt_codes_bits[i], 1, 1,
116
                           ccitt_syms, 2, 2,
117
                           INIT_VLC_USE_NEW_STATIC);
118
    }
119
5
    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
5
    initialized = 1;
123
}
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
            skip_bits(gb, cwi + 1);
145
            if (cwi > 5) {
146
                newmode = get_bits1(gb);
147
                eob = 1;
148
                cwi -= 6;
149
            }
150
            cw += cwi;
151
        } while(cwi == 5);
152
153
        codes[0] = cw;
154
        codes[1] = !eob;
155
156
        for (k = 0; k < 2; k++) {
157
            if (codes[k]) {
158
                if (*mode == !k) {
159
                    *(*runs)++ = saved_run;
160
                    if (*runs >= runend) {
161
                        av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n");
162
                        return AVERROR_INVALIDDATA;
163
                    }
164
                    if (*pix_left <= saved_run) {
165
                        av_log(avctx, AV_LOG_ERROR, "uncompressed run went out of bounds\n");
166
                        return AVERROR_INVALIDDATA;
167
                    }
168
                    *pix_left -= saved_run;
169
                    saved_run = 0;
170
                    *mode = !*mode;
171
                }
172
                saved_run += codes[k];
173
            }
174
        }
175
    } while (!eob);
176
    *(*runs)++ = saved_run;
177
    if (*runs >= runend) {
178
        av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n");
179
        return AVERROR_INVALIDDATA;
180
    }
181
    if (*pix_left <= saved_run) {
182
        if (*pix_left == saved_run)
183
            return 1;
184
        av_log(avctx, AV_LOG_ERROR, "uncompressed run went out of boundsE\n");
185
        return AVERROR_INVALIDDATA;
186
    }
187
    *pix_left -= saved_run;
188
    saved_run = 0;
189
    *mode = !*mode;
190
    if (newmode != *mode) { //FIXME CHECK
191
        *(*runs)++ = 0;
192
        if (*runs >= runend) {
193
            av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n");
194
            return AVERROR_INVALIDDATA;
195
        }
196
        *mode = newmode;
197
    }
198
    return 0;
199
}
200
201
12992
static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
202
                                 unsigned int pix_left, int *runs,
203
                                 const int *runend)
204
{
205
12992
    int mode         = 0;
206
12992
    unsigned int run = 0;
207
    unsigned int t;
208
    for (;;) {
209
755536
        t    = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
210
755536
        run += t;
211
755536
        if (t < 64) {
212
663056
            *runs++ = run;
213
663056
            if (runs >= runend) {
214
                av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
215
                return AVERROR_INVALIDDATA;
216
            }
217
663056
            if (pix_left <= run) {
218
12992
                if (pix_left == run)
219
12992
                    break;
220
                av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
221
                return AVERROR_INVALIDDATA;
222
            }
223
650064
            pix_left -= run;
224
650064
            run       = 0;
225
650064
            mode      = !mode;
226
92480
        } else if ((int)t == -1) {
227
            if (show_bits(gb, 12) == 15) {
228
                int ret;
229
                skip_bits(gb, 12);
230
                ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode);
231
                if (ret < 0) {
232
                    return ret;
233
                } else if (ret)
234
                    break;
235
            } else {
236
                av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
237
                return AVERROR_INVALIDDATA;
238
            }
239
        }
240
    }
241
12992
    *runs++ = 0;
242
12992
    return 0;
243
}
244
245
static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
246
                                 unsigned int width, int *runs,
247
                                 const int *runend, const int *ref)
248
{
249
    int mode          = 0, saved_run = 0, t;
250
    int run_off       = *ref++;
251
    unsigned int offs = 0, run = 0;
252
253
    while (offs < width) {
254
        int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
255
        if (cmode == -1) {
256
            av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
257
            return AVERROR_INVALIDDATA;
258
        }
259
        if (!cmode) { //pass mode
260
            if (run_off < width)
261
                run_off += *ref++;
262
            run      = run_off - offs;
263
            offs     = run_off;
264
            if (run_off < width)
265
                run_off += *ref++;
266
            if (offs > width) {
267
                av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
268
                return AVERROR_INVALIDDATA;
269
            }
270
            saved_run += run;
271
        } else if (cmode == 1) { //horizontal mode
272
            int k;
273
            for (k = 0; k < 2; k++) {
274
                run = 0;
275
                for (;;) {
276
                    t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
277
                    if (t == -1) {
278
                        av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
279
                        return AVERROR_INVALIDDATA;
280
                    }
281
                    run += t;
282
                    if (t < 64)
283
                        break;
284
                }
285
                *runs++ = run + saved_run;
286
                if (runs >= runend) {
287
                    av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
288
                    return AVERROR_INVALIDDATA;
289
                }
290
                saved_run = 0;
291
                offs     += run;
292
                if (offs > width || run > width) {
293
                    av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
294
                    return AVERROR_INVALIDDATA;
295
                }
296
                mode = !mode;
297
            }
298
        } else if (cmode == 9 || cmode == 10) {
299
            int xxx = get_bits(gb, 3);
300
            if (cmode == 9 && xxx == 7) {
301
                int ret;
302
                int pix_left = width - offs;
303
304
                if (saved_run) {
305
                    av_log(avctx, AV_LOG_ERROR, "saved run %d on entering uncompressed mode\n", saved_run);
306
                    return AVERROR_INVALIDDATA;
307
                }
308
                ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode);
309
                offs = width - pix_left;
310
                if (ret < 0) {
311
                    return ret;
312
                } else if (ret)
313
                    break;
314
            } else {
315
                avpriv_report_missing_feature(avctx, "Special mode %d xxx=%d support", cmode, xxx);
316
                return AVERROR_PATCHWELCOME;
317
            }
318
        } else { //vertical mode
319
            run      = run_off - offs + (cmode - 5);
320
            run_off -= *--ref;
321
            offs    += run;
322
            if (offs > width || run > width) {
323
                av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
324
                return AVERROR_INVALIDDATA;
325
            }
326
            *runs++ = run + saved_run;
327
            if (runs >= runend) {
328
                av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
329
                return AVERROR_INVALIDDATA;
330
            }
331
            saved_run = 0;
332
            mode      = !mode;
333
        }
334
        //sync line pointers
335
        while (offs < width && run_off <= offs) {
336
            run_off += *ref++;
337
            run_off += *ref++;
338
        }
339
    }
340
    *runs++ = saved_run;
341
    if (saved_run) {
342
        if (runs >= runend) {
343
            av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
344
            return -1;
345
        }
346
        *runs++ = 0;
347
    }
348
    return 0;
349
}
350
351
12992
static void put_line(uint8_t *dst, int size, int width, const int *runs)
352
{
353
    PutBitContext pb;
354
12992
    int run, mode = ~0, pix_left = width, run_idx = 0;
355
356
12992
    init_put_bits(&pb, dst, size);
357
676048
    while (pix_left > 0) {
358
663056
        run       = runs[run_idx++];
359
663056
        mode      = ~mode;
360
663056
        pix_left -= run;
361
2465368
        for (; run > 16; run -= 16)
362
1802312
            put_sbits(&pb, 16, mode);
363
663056
        if (run)
364
663056
            put_sbits(&pb, run, mode);
365
    }
366
12992
    flush_put_bits(&pb);
367
12992
}
368
369
12992
static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
370
{
371
12992
    unsigned int state = -1;
372
12992
    srcsize -= get_bits_count(gb);
373
155904
    while (srcsize-- > 0) {
374
155904
        state += state + get_bits1(gb);
375
155904
        if ((state & 0xFFF) == 1)
376
12992
            return 0;
377
    }
378
    return -1;
379
}
380
381
36
int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize,
382
                    uint8_t *dst, int height, int stride,
383
                    enum TiffCompr compr, int opts)
384
{
385
    int j;
386
    GetBitContext gb;
387
36
    int *runs, *ref = NULL, *runend;
388
    int ret;
389
36
    int runsize = avctx->width + 2;
390
    int has_eol;
391
392
36
    runs = av_malloc_array(runsize, sizeof(runs[0]));
393
36
    ref  = av_malloc_array(runsize, sizeof(ref[0]));
394

36
    if (!runs || !ref) {
395
        ret = AVERROR(ENOMEM);
396
        goto fail;
397
    }
398
36
    ref[0] = avctx->width;
399
36
    ref[1] = 0;
400
36
    ref[2] = 0;
401
36
    if ((ret = init_get_bits8(&gb, src, srcsize)) < 0)
402
        goto fail;
403

36
    has_eol = show_bits(&gb, 12) == 1 || show_bits(&gb, 16) == 1;
404
405
13028
    for (j = 0; j < height; j++) {
406
12992
        runend = runs + runsize;
407
12992
        if (compr == TIFF_G4) {
408
            ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend,
409
                                        ref);
410
            if (ret < 0)
411
                goto fail;
412
        } else {
413

12992
            int g3d1 = (compr == TIFF_G3) && !(opts & 1);
414

12992
            if (compr != TIFF_CCITT_RLE &&
415
12992
                has_eol &&
416
12992
                find_group3_syncmarker(&gb, srcsize * 8) < 0)
417
                break;
418

12992
            if (compr == TIFF_CCITT_RLE || g3d1 || get_bits1(&gb))
419
12992
                ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs,
420
                                            runend);
421
            else
422
                ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs,
423
                                            runend, ref);
424
12992
            if (compr == TIFF_CCITT_RLE)
425
                align_get_bits(&gb);
426
        }
427

12992
        if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0)
428
            goto fail;
429
430
12992
        if (ret < 0) {
431
            put_line(dst, stride, avctx->width, ref);
432
        } else {
433
12992
            put_line(dst, stride, avctx->width, runs);
434
12992
            FFSWAP(int *, runs, ref);
435
        }
436
12992
        dst += stride;
437
    }
438
36
    ret = 0;
439
36
fail:
440
36
    av_free(runs);
441
36
    av_free(ref);
442
36
    return ret;
443
}