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1
/*
2
 * TIFF image decoder
3
 * Copyright (c) 2006 Konstantin Shishkov
4
 *
5
 * This file is part of Libav.
6
 *
7
 * Libav 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
 *
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 * Libav 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.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/**
23
 * TIFF image decoder
24
 * @file
25
 * @author Konstantin Shishkov
26
 */
27
#include "avcodec.h"
28
#if CONFIG_ZLIB
29
#include <zlib.h>
30
#endif
31
#include "lzw.h"
32
#include "tiff.h"
33
#include "faxcompr.h"
34
#include "libavutil/common.h"
35
#include "libavutil/intreadwrite.h"
36
#include "libavutil/imgutils.h"
37

    
38
typedef struct TiffContext {
39
    AVCodecContext *avctx;
40
    AVFrame picture;
41

    
42
    int width, height;
43
    unsigned int bpp;
44
    int le;
45
    int compr;
46
    int invert;
47
    int fax_opts;
48
    int predictor;
49
    int fill_order;
50

    
51
    int strips, rps, sstype;
52
    int sot;
53
    const uint8_t* stripdata;
54
    const uint8_t* stripsizes;
55
    int stripsize, stripoff;
56
    LZWState *lzw;
57
} TiffContext;
58

    
59
static int tget_short(const uint8_t **p, int le){
60
    int v = le ? AV_RL16(*p) : AV_RB16(*p);
61
    *p += 2;
62
    return v;
63
}
64

    
65
static int tget_long(const uint8_t **p, int le){
66
    int v = le ? AV_RL32(*p) : AV_RB32(*p);
67
    *p += 4;
68
    return v;
69
}
70

    
71
static int tget(const uint8_t **p, int type, int le){
72
    switch(type){
73
    case TIFF_BYTE : return *(*p)++;
74
    case TIFF_SHORT: return tget_short(p, le);
75
    case TIFF_LONG : return tget_long (p, le);
76
    default        : return -1;
77
    }
78
}
79

    
80
#if CONFIG_ZLIB
81
static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src, int size)
82
{
83
    z_stream zstream;
84
    int zret;
85

    
86
    memset(&zstream, 0, sizeof(zstream));
87
    zstream.next_in = src;
88
    zstream.avail_in = size;
89
    zstream.next_out = dst;
90
    zstream.avail_out = *len;
91
    zret = inflateInit(&zstream);
92
    if (zret != Z_OK) {
93
        av_log(NULL, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
94
        return zret;
95
    }
96
    zret = inflate(&zstream, Z_SYNC_FLUSH);
97
    inflateEnd(&zstream);
98
    *len = zstream.total_out;
99
    return zret == Z_STREAM_END ? Z_OK : zret;
100
}
101
#endif
102

    
103
static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uint8_t *src, int size, int lines){
104
    int c, line, pixels, code;
105
    const uint8_t *ssrc = src;
106
    int width = s->width * s->bpp >> 3;
107
#if CONFIG_ZLIB
108
    uint8_t *zbuf; unsigned long outlen;
109

    
110
    if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
111
        int ret;
112
        outlen = width * lines;
113
        zbuf = av_malloc(outlen);
114
        ret = tiff_uncompress(zbuf, &outlen, src, size);
115
        if(ret != Z_OK){
116
            av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu) with error %d\n", outlen, (unsigned long)width * lines, ret);
117
            av_free(zbuf);
118
            return -1;
119
        }
120
        src = zbuf;
121
        for(line = 0; line < lines; line++){
122
            memcpy(dst, src, width);
123
            dst += stride;
124
            src += width;
125
        }
126
        av_free(zbuf);
127
        return 0;
128
    }
129
#endif
130
    if(s->compr == TIFF_LZW){
131
        if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){
132
            av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
133
            return -1;
134
        }
135
    }
136
    if(s->compr == TIFF_CCITT_RLE || s->compr == TIFF_G3 || s->compr == TIFF_G4){
137
        int i, ret = 0;
138
        uint8_t *src2 = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
139

    
140
        if(!src2 || (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE < (unsigned)size){
141
            av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
142
            return -1;
143
        }
144
        if(s->fax_opts & 2){
145
            av_log(s->avctx, AV_LOG_ERROR, "Uncompressed fax mode is not supported (yet)\n");
146
            av_free(src2);
147
            return -1;
148
        }
149
        if(!s->fill_order){
150
            memcpy(src2, src, size);
151
        }else{
152
            for(i = 0; i < size; i++)
153
                src2[i] = av_reverse[src[i]];
154
        }
155
        memset(src2+size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
156
        switch(s->compr){
157
        case TIFF_CCITT_RLE:
158
        case TIFF_G3:
159
        case TIFF_G4:
160
            ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride, s->compr, s->fax_opts);
161
            break;
162
        }
163
        av_free(src2);
164
        return ret;
165
    }
166
    for(line = 0; line < lines; line++){
167
        if(src - ssrc > size){
168
            av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
169
            return -1;
170
        }
171
        switch(s->compr){
172
        case TIFF_RAW:
173
            if (!s->fill_order) {
174
                memcpy(dst, src, width);
175
            } else {
176
                int i;
177
                for (i = 0; i < width; i++)
178
                    dst[i] = av_reverse[src[i]];
179
            }
180
            src += width;
181
            break;
182
        case TIFF_PACKBITS:
183
            for(pixels = 0; pixels < width;){
184
                code = (int8_t)*src++;
185
                if(code >= 0){
186
                    code++;
187
                    if(pixels + code > width){
188
                        av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");
189
                        return -1;
190
                    }
191
                    memcpy(dst + pixels, src, code);
192
                    src += code;
193
                    pixels += code;
194
                }else if(code != -128){ // -127..-1
195
                    code = (-code) + 1;
196
                    if(pixels + code > width){
197
                        av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");
198
                        return -1;
199
                    }
200
                    c = *src++;
201
                    memset(dst + pixels, c, code);
202
                    pixels += code;
203
                }
204
            }
205
            break;
206
        case TIFF_LZW:
207
            pixels = ff_lzw_decode(s->lzw, dst, width);
208
            if(pixels < width){
209
                av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
210
                return -1;
211
            }
212
            break;
213
        }
214
        dst += stride;
215
    }
216
    return 0;
217
}
218

    
219

    
220
static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *buf, const uint8_t *end_buf)
221
{
222
    int tag, type, count, off, value = 0;
223
    int i, j;
224
    uint32_t *pal;
225
    const uint8_t *rp, *gp, *bp;
226

    
227
    tag = tget_short(&buf, s->le);
228
    type = tget_short(&buf, s->le);
229
    count = tget_long(&buf, s->le);
230
    off = tget_long(&buf, s->le);
231

    
232
    if(count == 1){
233
        switch(type){
234
        case TIFF_BYTE:
235
        case TIFF_SHORT:
236
            buf -= 4;
237
            value = tget(&buf, type, s->le);
238
            buf = NULL;
239
            break;
240
        case TIFF_LONG:
241
            value = off;
242
            buf = NULL;
243
            break;
244
        case TIFF_STRING:
245
            if(count <= 4){
246
                buf -= 4;
247
                break;
248
            }
249
        default:
250
            value = -1;
251
            buf = start + off;
252
        }
253
    }else if(type_sizes[type] * count <= 4){
254
        buf -= 4;
255
    }else{
256
        buf = start + off;
257
    }
258

    
259
    if(buf && (buf < start || buf > end_buf)){
260
        av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
261
        return -1;
262
    }
263

    
264
    switch(tag){
265
    case TIFF_WIDTH:
266
        s->width = value;
267
        break;
268
    case TIFF_HEIGHT:
269
        s->height = value;
270
        break;
271
    case TIFF_BPP:
272
        if(count > 4){
273
            av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%d, %d components)\n", s->bpp, count);
274
            return -1;
275
        }
276
        if(count == 1) s->bpp = value;
277
        else{
278
            switch(type){
279
            case TIFF_BYTE:
280
                s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
281
                break;
282
            case TIFF_SHORT:
283
            case TIFF_LONG:
284
                s->bpp = 0;
285
                for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le);
286
                break;
287
            default:
288
                s->bpp = -1;
289
            }
290
        }
291
        switch(s->bpp*10 + count){
292
        case 11:
293
            s->avctx->pix_fmt = PIX_FMT_MONOBLACK;
294
            break;
295
        case 81:
296
            s->avctx->pix_fmt = PIX_FMT_PAL8;
297
            break;
298
        case 243:
299
            s->avctx->pix_fmt = PIX_FMT_RGB24;
300
            break;
301
        case 161:
302
            s->avctx->pix_fmt = PIX_FMT_GRAY16BE;
303
            break;
304
        case 324:
305
            s->avctx->pix_fmt = PIX_FMT_RGBA;
306
            break;
307
        case 483:
308
            s->avctx->pix_fmt = s->le ? PIX_FMT_RGB48LE : PIX_FMT_RGB48BE;
309
            break;
310
        default:
311
            av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%d, %d components)\n", s->bpp, count);
312
            return -1;
313
        }
314
        if(s->width != s->avctx->width || s->height != s->avctx->height){
315
            if(av_image_check_size(s->width, s->height, 0, s->avctx))
316
                return -1;
317
            avcodec_set_dimensions(s->avctx, s->width, s->height);
318
        }
319
        if(s->picture.data[0])
320
            s->avctx->release_buffer(s->avctx, &s->picture);
321
        if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
322
            av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
323
            return -1;
324
        }
325
        if(s->bpp == 8){
326
            /* make default grayscale pal */
327
            pal = (uint32_t *) s->picture.data[1];
328
            for(i = 0; i < 256; i++)
329
                pal[i] = i * 0x010101;
330
        }
331
        break;
332
    case TIFF_COMPR:
333
        s->compr = value;
334
        s->predictor = 0;
335
        switch(s->compr){
336
        case TIFF_RAW:
337
        case TIFF_PACKBITS:
338
        case TIFF_LZW:
339
        case TIFF_CCITT_RLE:
340
            break;
341
        case TIFF_G3:
342
        case TIFF_G4:
343
            s->fax_opts = 0;
344
            break;
345
        case TIFF_DEFLATE:
346
        case TIFF_ADOBE_DEFLATE:
347
#if CONFIG_ZLIB
348
            break;
349
#else
350
            av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
351
            return -1;
352
#endif
353
        case TIFF_JPEG:
354
        case TIFF_NEWJPEG:
355
            av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
356
            return -1;
357
        default:
358
            av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
359
            return -1;
360
        }
361
        break;
362
    case TIFF_ROWSPERSTRIP:
363
        if(type == TIFF_LONG && value == -1)
364
            value = s->avctx->height;
365
        if(value < 1){
366
            av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
367
            return -1;
368
        }
369
        s->rps = value;
370
        break;
371
    case TIFF_STRIP_OFFS:
372
        if(count == 1){
373
            s->stripdata = NULL;
374
            s->stripoff = value;
375
        }else
376
            s->stripdata = start + off;
377
        s->strips = count;
378
        if(s->strips == 1) s->rps = s->height;
379
        s->sot = type;
380
        if(s->stripdata > end_buf){
381
            av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
382
            return -1;
383
        }
384
        break;
385
    case TIFF_STRIP_SIZE:
386
        if(count == 1){
387
            s->stripsizes = NULL;
388
            s->stripsize = value;
389
            s->strips = 1;
390
        }else{
391
            s->stripsizes = start + off;
392
        }
393
        s->strips = count;
394
        s->sstype = type;
395
        if(s->stripsizes > end_buf){
396
            av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
397
            return -1;
398
        }
399
        break;
400
    case TIFF_PREDICTOR:
401
        s->predictor = value;
402
        break;
403
    case TIFF_INVERT:
404
        switch(value){
405
        case 0:
406
            s->invert = 1;
407
            break;
408
        case 1:
409
            s->invert = 0;
410
            break;
411
        case 2:
412
        case 3:
413
            break;
414
        default:
415
            av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value);
416
            return -1;
417
        }
418
        break;
419
    case TIFF_FILL_ORDER:
420
        if(value < 1 || value > 2){
421
            av_log(s->avctx, AV_LOG_ERROR, "Unknown FillOrder value %d, trying default one\n", value);
422
            value = 1;
423
        }
424
        s->fill_order = value - 1;
425
        break;
426
    case TIFF_PAL:
427
        if(s->avctx->pix_fmt != PIX_FMT_PAL8){
428
            av_log(s->avctx, AV_LOG_ERROR, "Palette met but this is not palettized format\n");
429
            return -1;
430
        }
431
        pal = (uint32_t *) s->picture.data[1];
432
        off = type_sizes[type];
433
        rp = buf;
434
        gp = buf + count / 3 * off;
435
        bp = buf + count / 3 * off * 2;
436
        off = (type_sizes[type] - 1) << 3;
437
        for(i = 0; i < count / 3; i++){
438
            j = (tget(&rp, type, s->le) >> off) << 16;
439
            j |= (tget(&gp, type, s->le) >> off) << 8;
440
            j |= tget(&bp, type, s->le) >> off;
441
            pal[i] = j;
442
        }
443
        break;
444
    case TIFF_PLANAR:
445
        if(value == 2){
446
            av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");
447
            return -1;
448
        }
449
        break;
450
    case TIFF_T4OPTIONS:
451
        if(s->compr == TIFF_G3)
452
            s->fax_opts = value;
453
        break;
454
    case TIFF_T6OPTIONS:
455
        if(s->compr == TIFF_G4)
456
            s->fax_opts = value;
457
        break;
458
    }
459
    return 0;
460
}
461

    
462
static int decode_frame(AVCodecContext *avctx,
463
                        void *data, int *data_size,
464
                        AVPacket *avpkt)
465
{
466
    const uint8_t *buf = avpkt->data;
467
    int buf_size = avpkt->size;
468
    TiffContext * const s = avctx->priv_data;
469
    AVFrame *picture = data;
470
    AVFrame * const p= (AVFrame*)&s->picture;
471
    const uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
472
    int id, le, off;
473
    int i, j, entries;
474
    int stride, soff, ssize;
475
    uint8_t *dst;
476

    
477
    //parse image header
478
    id = AV_RL16(buf); buf += 2;
479
    if(id == 0x4949) le = 1;
480
    else if(id == 0x4D4D) le = 0;
481
    else{
482
        av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
483
        return -1;
484
    }
485
    s->le = le;
486
    s->invert = 0;
487
    s->compr = TIFF_RAW;
488
    s->fill_order = 0;
489
    // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
490
    // that further identifies the file as a TIFF file"
491
    if(tget_short(&buf, le) != 42){
492
        av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");
493
        return -1;
494
    }
495
    /* parse image file directory */
496
    off = tget_long(&buf, le);
497
    if(orig_buf + off + 14 >= end_buf){
498
        av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
499
        return -1;
500
    }
501
    buf = orig_buf + off;
502
    entries = tget_short(&buf, le);
503
    for(i = 0; i < entries; i++){
504
        if(tiff_decode_tag(s, orig_buf, buf, end_buf) < 0)
505
            return -1;
506
        buf += 12;
507
    }
508
    if(!s->stripdata && !s->stripoff){
509
        av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");
510
        return -1;
511
    }
512
    /* now we have the data and may start decoding */
513
    if(!p->data[0]){
514
        s->bpp = 1;
515
        avctx->pix_fmt = PIX_FMT_MONOBLACK;
516
        if(s->width != s->avctx->width || s->height != s->avctx->height){
517
            if(av_image_check_size(s->width, s->height, 0, s->avctx))
518
                return -1;
519
            avcodec_set_dimensions(s->avctx, s->width, s->height);
520
        }
521
        if(s->picture.data[0])
522
            s->avctx->release_buffer(s->avctx, &s->picture);
523
        if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
524
            av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
525
            return -1;
526
        }
527
    }
528
    if(s->strips == 1 && !s->stripsize){
529
        av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
530
        s->stripsize = buf_size - s->stripoff;
531
    }
532
    stride = p->linesize[0];
533
    dst = p->data[0];
534
    for(i = 0; i < s->height; i += s->rps){
535
        if(s->stripsizes)
536
            ssize = tget(&s->stripsizes, s->sstype, s->le);
537
        else
538
            ssize = s->stripsize;
539

    
540
        if (ssize > buf_size) {
541
            av_log(avctx, AV_LOG_ERROR, "Buffer size is smaller than strip size\n");
542
            return -1;
543
        }
544

    
545
        if(s->stripdata){
546
            soff = tget(&s->stripdata, s->sot, s->le);
547
        }else
548
            soff = s->stripoff;
549
        if (soff < 0) {
550
            av_log(avctx, AV_LOG_ERROR, "Invalid stripoff: %d\n", soff);
551
            return AVERROR(EINVAL);
552
        }
553
        if(tiff_unpack_strip(s, dst, stride, orig_buf + soff, ssize, FFMIN(s->rps, s->height - i)) < 0)
554
            break;
555
        dst += s->rps * stride;
556
    }
557
    if(s->predictor == 2){
558
        dst = p->data[0];
559
        soff = s->bpp >> 3;
560
        ssize = s->width * soff;
561
        for(i = 0; i < s->height; i++) {
562
            for(j = soff; j < ssize; j++)
563
                dst[j] += dst[j - soff];
564
            dst += stride;
565
        }
566
    }
567

    
568
    if(s->invert){
569
        uint8_t *src;
570
        int j;
571

    
572
        src = s->picture.data[0];
573
        for(j = 0; j < s->height; j++){
574
            for(i = 0; i < s->picture.linesize[0]; i++)
575
                src[i] = 255 - src[i];
576
            src += s->picture.linesize[0];
577
        }
578
    }
579
    *picture= *(AVFrame*)&s->picture;
580
    *data_size = sizeof(AVPicture);
581

    
582
    return buf_size;
583
}
584

    
585
static av_cold int tiff_init(AVCodecContext *avctx){
586
    TiffContext *s = avctx->priv_data;
587

    
588
    s->width = 0;
589
    s->height = 0;
590
    s->avctx = avctx;
591
    avcodec_get_frame_defaults((AVFrame*)&s->picture);
592
    avctx->coded_frame= (AVFrame*)&s->picture;
593
    ff_lzw_decode_open(&s->lzw);
594
    ff_ccitt_unpack_init();
595

    
596
    return 0;
597
}
598

    
599
static av_cold int tiff_end(AVCodecContext *avctx)
600
{
601
    TiffContext * const s = avctx->priv_data;
602

    
603
    ff_lzw_decode_close(&s->lzw);
604
    if(s->picture.data[0])
605
        avctx->release_buffer(avctx, &s->picture);
606
    return 0;
607
}
608

    
609
AVCodec ff_tiff_decoder = {
610
    "tiff",
611
    AVMEDIA_TYPE_VIDEO,
612
    CODEC_ID_TIFF,
613
    sizeof(TiffContext),
614
    tiff_init,
615
    NULL,
616
    tiff_end,
617
    decode_frame,
618
    CODEC_CAP_DR1,
619
    NULL,
620
    .long_name = NULL_IF_CONFIG_SMALL("TIFF image"),
621
};