1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
|
/*
* CCITT Fax Group 3 and 4 decompression
* Copyright (c) 2008 Konstantin Shishkov
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* CCITT Fax Group 3 and 4 decompression
* @author Konstantin Shishkov
*/
#include "avcodec.h"
#include "get_bits.h"
#include "put_bits.h"
#include "faxcompr.h"
#define CCITT_SYMS 104
static const uint16_t ccitt_syms[CCITT_SYMS] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896,
960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,
1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560
};
static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =
{
{
0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,
0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,
0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,
0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,
0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,
0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,
0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
},
{
0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,
0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,
0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,
0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,
0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,
0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,
0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
}
};
static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =
{
{
8, 6, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 5, 5, 6, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 9, 11, 11, 11, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12
},
{
10, 3, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 7, 8, 8, 9, 10, 10, 10, 11,
11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,
13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12
}
};
static const uint8_t ccitt_group3_2d_bits[11] = {
1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1
};
static const uint8_t ccitt_group3_2d_lens[11] = {
4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9
};
static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;
av_cold void ff_ccitt_unpack_init(void)
{
static VLC_TYPE code_table1[528][2];
static VLC_TYPE code_table2[648][2];
int i;
static int initialized = 0;
if (initialized)
return;
ccitt_vlc[0].table = code_table1;
ccitt_vlc[0].table_allocated = 528;
ccitt_vlc[1].table = code_table2;
ccitt_vlc[1].table_allocated = 648;
for (i = 0; i < 2; i++) {
ff_init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,
ccitt_codes_lens[i], 1, 1,
ccitt_codes_bits[i], 1, 1,
ccitt_syms, 2, 2,
INIT_VLC_USE_NEW_STATIC);
}
INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,
ccitt_group3_2d_lens, 1, 1,
ccitt_group3_2d_bits, 1, 1, 512);
initialized = 1;
}
static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
unsigned int pix_left, int *runs,
const int *runend)
{
int mode = 0;
unsigned int run = 0;
unsigned int t;
for (;;) {
t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
run += t;
if (t < 64) {
*runs++ = run;
if (runs >= runend) {
av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
return AVERROR_INVALIDDATA;
}
if (pix_left <= run) {
if (pix_left == run)
break;
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
return AVERROR_INVALIDDATA;
}
pix_left -= run;
run = 0;
mode = !mode;
} else if ((int)t == -1) {
av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
return AVERROR_INVALIDDATA;
}
}
*runs++ = 0;
return 0;
}
static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
unsigned int width, int *runs,
const int *runend, const int *ref)
{
int mode = 0, saved_run = 0, t;
int run_off = *ref++;
unsigned int offs = 0, run = 0;
runend--; // for the last written 0
while (offs < width) {
int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
if (cmode == -1) {
av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
return AVERROR_INVALIDDATA;
}
if (!cmode) { //pass mode
run_off += *ref++;
run = run_off - offs;
offs = run_off;
run_off += *ref++;
if (offs > width) {
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
return AVERROR_INVALIDDATA;
}
saved_run += run;
} else if (cmode == 1) { //horizontal mode
int k;
for (k = 0; k < 2; k++) {
run = 0;
for (;;) {
t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
if (t == -1) {
av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
return AVERROR_INVALIDDATA;
}
run += t;
if (t < 64)
break;
}
*runs++ = run + saved_run;
if (runs >= runend) {
av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
return AVERROR_INVALIDDATA;
}
saved_run = 0;
offs += run;
if (offs > width || run > width) {
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
return AVERROR_INVALIDDATA;
}
mode = !mode;
}
} else if (cmode == 9 || cmode == 10) {
avpriv_report_missing_feature(avctx, "Special modes support");
return AVERROR_PATCHWELCOME;
} else { //vertical mode
run = run_off - offs + (cmode - 5);
run_off -= *--ref;
offs += run;
if (offs > width || run > width) {
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
return AVERROR_INVALIDDATA;
}
*runs++ = run + saved_run;
if (runs >= runend) {
av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
return AVERROR_INVALIDDATA;
}
saved_run = 0;
mode = !mode;
}
//sync line pointers
while (run_off <= offs) {
run_off += *ref++;
run_off += *ref++;
}
}
*runs++ = saved_run;
*runs++ = 0;
return 0;
}
static void put_line(uint8_t *dst, int size, int width, const int *runs)
{
PutBitContext pb;
int run, mode = ~0, pix_left = width, run_idx = 0;
init_put_bits(&pb, dst, size * 8);
while (pix_left > 0) {
run = runs[run_idx++];
mode = ~mode;
pix_left -= run;
for (; run > 16; run -= 16)
put_sbits(&pb, 16, mode);
if (run)
put_sbits(&pb, run, mode);
}
flush_put_bits(&pb);
}
static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
{
unsigned int state = -1;
srcsize -= get_bits_count(gb);
while (srcsize-- > 0) {
state += state + get_bits1(gb);
if ((state & 0xFFF) == 1)
return 0;
}
return -1;
}
int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize,
uint8_t *dst, int height, int stride,
enum TiffCompr compr, int opts)
{
int j;
GetBitContext gb;
int *runs, *ref = NULL, *runend;
int ret;
int runsize = avctx->width + 2;
runs = av_malloc(runsize * sizeof(runs[0]));
ref = av_malloc(runsize * sizeof(ref[0]));
if (!runs || !ref) {
ret = AVERROR(ENOMEM);
goto fail;
}
ref[0] = avctx->width;
ref[1] = 0;
ref[2] = 0;
init_get_bits(&gb, src, srcsize * 8);
for (j = 0; j < height; j++) {
runend = runs + runsize;
if (compr == TIFF_G4) {
ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend,
ref);
if (ret < 0)
goto fail;
} else {
int g3d1 = (compr == TIFF_G3) && !(opts & 1);
if (compr != TIFF_CCITT_RLE &&
find_group3_syncmarker(&gb, srcsize * 8) < 0)
break;
if (compr == TIFF_CCITT_RLE || g3d1 || get_bits1(&gb))
ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs,
runend);
else
ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs,
runend, ref);
if (compr == TIFF_CCITT_RLE)
align_get_bits(&gb);
}
if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0)
goto fail;
if (ret < 0) {
put_line(dst, stride, avctx->width, ref);
} else {
put_line(dst, stride, avctx->width, runs);
FFSWAP(int *, runs, ref);
}
dst += stride;
}
ret = 0;
fail:
av_free(runs);
av_free(ref);
return ret;
}
|
