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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 | 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 | 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 | ff_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 | ||
126 | static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb, | |
127 | unsigned int pix_left, int *runs, | |
128 | const int *runend) | |
129 | { | |
130 | int mode = 0; | |
131 | unsigned int run = 0; | |
132 | unsigned int t; | |
133 | for (;;) { | |
134 | t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); | |
135 | run += t; | |
136 | if (t < 64) { | |
137 | *runs++ = run; | |
138 | if (runs >= runend) { | |
139 | av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); | |
140 | return AVERROR_INVALIDDATA; | |
141 | } | |
142 | if (pix_left <= run) { | |
143 | if (pix_left == run) | |
144 | break; | |
145 | av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); | |
146 | return AVERROR_INVALIDDATA; | |
147 | } | |
148 | pix_left -= run; | |
149 | run = 0; | |
150 | mode = !mode; | |
151 | } else if ((int)t == -1) { | |
152 | av_log(avctx, AV_LOG_ERROR, "Incorrect code\n"); | |
153 | return AVERROR_INVALIDDATA; | |
154 | } | |
155 | } | |
156 | *runs++ = 0; | |
157 | return 0; | |
158 | } | |
159 | ||
160 | static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb, | |
161 | unsigned int width, int *runs, | |
162 | const int *runend, const int *ref) | |
163 | { | |
164 | int mode = 0, saved_run = 0, t; | |
165 | int run_off = *ref++; | |
166 | unsigned int offs = 0, run = 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 AVERROR_INVALIDDATA; | |
173 | } | |
174 | if (!cmode) { //pass mode | |
175 | if (run_off < width) | |
176 | run_off += *ref++; | |
177 | run = run_off - offs; | |
178 | offs = run_off; | |
179 | if (run_off < width) | |
180 | run_off += *ref++; | |
181 | if (offs > width) { | |
182 | av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); | |
183 | return AVERROR_INVALIDDATA; | |
184 | } | |
185 | saved_run += run; | |
186 | } else if (cmode == 1) { //horizontal mode | |
187 | int k; | |
188 | for (k = 0; k < 2; k++) { | |
189 | run = 0; | |
190 | for (;;) { | |
191 | t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); | |
192 | if (t == -1) { | |
193 | av_log(avctx, AV_LOG_ERROR, "Incorrect code\n"); | |
194 | return AVERROR_INVALIDDATA; | |
195 | } | |
196 | run += t; | |
197 | if (t < 64) | |
198 | break; | |
199 | } | |
200 | *runs++ = run + saved_run; | |
201 | if (runs >= runend) { | |
202 | av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); | |
203 | return AVERROR_INVALIDDATA; | |
204 | } | |
205 | saved_run = 0; | |
206 | offs += run; | |
207 | if (offs > width || run > width) { | |
208 | av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); | |
209 | return AVERROR_INVALIDDATA; | |
210 | } | |
211 | mode = !mode; | |
212 | } | |
213 | } else if (cmode == 9 || cmode == 10) { | |
214 | avpriv_report_missing_feature(avctx, "Special modes support"); | |
215 | return AVERROR_PATCHWELCOME; | |
216 | } else { //vertical mode | |
217 | run = run_off - offs + (cmode - 5); | |
218 | run_off -= *--ref; | |
219 | offs += run; | |
220 | if (offs > width || run > width) { | |
221 | av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); | |
222 | return AVERROR_INVALIDDATA; | |
223 | } | |
224 | *runs++ = run + saved_run; | |
225 | if (runs >= runend) { | |
226 | av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); | |
227 | return AVERROR_INVALIDDATA; | |
228 | } | |
229 | saved_run = 0; | |
230 | mode = !mode; | |
231 | } | |
232 | //sync line pointers | |
233 | while (offs < width && run_off <= offs) { | |
234 | run_off += *ref++; | |
235 | run_off += *ref++; | |
236 | } | |
237 | } | |
238 | *runs++ = saved_run; | |
239 | if (saved_run) { | |
240 | if (runs >= runend) { | |
241 | av_log(avctx, AV_LOG_ERROR, "Run overrun\n"); | |
242 | return -1; | |
243 | } | |
244 | *runs++ = 0; | |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
249 | static void put_line(uint8_t *dst, int size, int width, const int *runs) | |
250 | { | |
251 | PutBitContext pb; | |
252 | int run, mode = ~0, pix_left = width, run_idx = 0; | |
253 | ||
254 | init_put_bits(&pb, dst, size * 8); | |
255 | while (pix_left > 0) { | |
256 | run = runs[run_idx++]; | |
257 | mode = ~mode; | |
258 | pix_left -= run; | |
259 | for (; run > 16; run -= 16) | |
260 | put_sbits(&pb, 16, mode); | |
261 | if (run) | |
262 | put_sbits(&pb, run, mode); | |
263 | } | |
264 | flush_put_bits(&pb); | |
265 | } | |
266 | ||
267 | static int find_group3_syncmarker(GetBitContext *gb, int srcsize) | |
268 | { | |
269 | unsigned int state = -1; | |
270 | srcsize -= get_bits_count(gb); | |
271 | while (srcsize-- > 0) { | |
272 | state += state + get_bits1(gb); | |
273 | if ((state & 0xFFF) == 1) | |
274 | return 0; | |
275 | } | |
276 | return -1; | |
277 | } | |
278 | ||
279 | int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize, | |
280 | uint8_t *dst, int height, int stride, | |
281 | enum TiffCompr compr, int opts) | |
282 | { | |
283 | int j; | |
284 | GetBitContext gb; | |
285 | int *runs, *ref = NULL, *runend; | |
286 | int ret; | |
287 | int runsize = avctx->width + 2; | |
288 | int has_eol; | |
289 | ||
290 | runs = av_malloc_array(runsize, sizeof(runs[0])); | |
291 | ref = av_malloc_array(runsize, sizeof(ref[0])); | |
292 | if (!runs || !ref) { | |
293 | ret = AVERROR(ENOMEM); | |
294 | goto fail; | |
295 | } | |
296 | ref[0] = avctx->width; | |
297 | ref[1] = 0; | |
298 | ref[2] = 0; | |
299 | init_get_bits(&gb, src, srcsize * 8); | |
300 | has_eol = show_bits(&gb, 12) == 1 || show_bits(&gb, 16) == 1; | |
301 | ||
302 | for (j = 0; j < height; j++) { | |
303 | runend = runs + runsize; | |
304 | if (compr == TIFF_G4) { | |
305 | ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, | |
306 | ref); | |
307 | if (ret < 0) | |
308 | goto fail; | |
309 | } else { | |
310 | int g3d1 = (compr == TIFF_G3) && !(opts & 1); | |
311 | if (compr != TIFF_CCITT_RLE && | |
312 | has_eol && | |
313 | find_group3_syncmarker(&gb, srcsize * 8) < 0) | |
314 | break; | |
315 | if (compr == TIFF_CCITT_RLE || g3d1 || get_bits1(&gb)) | |
316 | ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs, | |
317 | runend); | |
318 | else | |
319 | ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, | |
320 | runend, ref); | |
321 | if (compr == TIFF_CCITT_RLE) | |
322 | align_get_bits(&gb); | |
323 | } | |
324 | if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0) | |
325 | goto fail; | |
326 | ||
327 | if (ret < 0) { | |
328 | put_line(dst, stride, avctx->width, ref); | |
329 | } else { | |
330 | put_line(dst, stride, avctx->width, runs); | |
331 | FFSWAP(int *, runs, ref); | |
332 | } | |
333 | dst += stride; | |
334 | } | |
335 | ret = 0; | |
336 | fail: | |
337 | av_free(runs); | |
338 | av_free(ref); | |
339 | return ret; | |
340 | } |