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1 | /* |
2 | * TIFF Common Routines | |
3 | * Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ mail.de> | |
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 | * TIFF Common Routines | |
25 | * @author Thilo Borgmann <thilo.borgmann _at_ mail.de> | |
26 | */ | |
27 | ||
28 | #include "tiff_common.h" | |
29 | ||
30 | ||
31 | int ff_tis_ifd(unsigned tag) | |
32 | { | |
33 | int i; | |
34 | for (i = 0; i < FF_ARRAY_ELEMS(ifd_tags); i++) { | |
35 | if (ifd_tags[i] == tag) { | |
36 | return i + 1; | |
37 | } | |
38 | } | |
39 | return 0; | |
40 | } | |
41 | ||
42 | ||
43 | unsigned ff_tget_short(GetByteContext *gb, int le) | |
44 | { | |
45 | return le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb); | |
46 | } | |
47 | ||
48 | ||
49 | unsigned ff_tget_long(GetByteContext *gb, int le) | |
50 | { | |
51 | return le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb); | |
52 | } | |
53 | ||
54 | ||
55 | double ff_tget_double(GetByteContext *gb, int le) | |
56 | { | |
57 | av_alias64 i = { .u64 = le ? bytestream2_get_le64(gb) : bytestream2_get_be64(gb)}; | |
58 | return i.f64; | |
59 | } | |
60 | ||
61 | ||
62 | unsigned ff_tget(GetByteContext *gb, int type, int le) | |
63 | { | |
64 | switch (type) { | |
65 | case TIFF_BYTE: return bytestream2_get_byte(gb); | |
66 | case TIFF_SHORT: return ff_tget_short(gb, le); | |
67 | case TIFF_LONG: return ff_tget_long(gb, le); | |
68 | default: return UINT_MAX; | |
69 | } | |
70 | } | |
71 | ||
72 | static const char *auto_sep(int count, const char *sep, int i, int columns) | |
73 | { | |
74 | if (sep) | |
75 | return i ? sep : ""; | |
76 | if (i && i%columns) { | |
77 | return ", "; | |
78 | } else | |
79 | return columns < count ? "\n" : ""; | |
80 | } | |
81 | ||
82 | int ff_tadd_rational_metadata(int count, const char *name, const char *sep, | |
83 | GetByteContext *gb, int le, AVDictionary **metadata) | |
84 | { | |
85 | AVBPrint bp; | |
86 | char *ap; | |
87 | int32_t nom, denom; | |
88 | int i; | |
89 | ||
90 | if (count >= INT_MAX / sizeof(int64_t) || count <= 0) | |
91 | return AVERROR_INVALIDDATA; | |
92 | if (bytestream2_get_bytes_left(gb) < count * sizeof(int64_t)) | |
93 | return AVERROR_INVALIDDATA; | |
94 | ||
95 | av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_UNLIMITED); | |
96 | ||
97 | for (i = 0; i < count; i++) { | |
98 | nom = ff_tget_long(gb, le); | |
99 | denom = ff_tget_long(gb, le); | |
100 | av_bprintf(&bp, "%s%7i:%-7i", auto_sep(count, sep, i, 4), nom, denom); | |
101 | } | |
102 | ||
103 | if ((i = av_bprint_finalize(&bp, &ap))) { | |
104 | return i; | |
105 | } | |
106 | if (!ap) { | |
107 | return AVERROR(ENOMEM); | |
108 | } | |
109 | ||
110 | av_dict_set(metadata, name, ap, AV_DICT_DONT_STRDUP_VAL); | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | ||
116 | int ff_tadd_long_metadata(int count, const char *name, const char *sep, | |
117 | GetByteContext *gb, int le, AVDictionary **metadata) | |
118 | { | |
119 | AVBPrint bp; | |
120 | char *ap; | |
121 | int i; | |
122 | ||
123 | if (count >= INT_MAX / sizeof(int32_t) || count <= 0) | |
124 | return AVERROR_INVALIDDATA; | |
125 | if (bytestream2_get_bytes_left(gb) < count * sizeof(int32_t)) | |
126 | return AVERROR_INVALIDDATA; | |
127 | ||
128 | av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_UNLIMITED); | |
129 | ||
130 | for (i = 0; i < count; i++) { | |
131 | av_bprintf(&bp, "%s%7i", auto_sep(count, sep, i, 8), ff_tget_long(gb, le)); | |
132 | } | |
133 | ||
134 | if ((i = av_bprint_finalize(&bp, &ap))) { | |
135 | return i; | |
136 | } | |
137 | if (!ap) { | |
138 | return AVERROR(ENOMEM); | |
139 | } | |
140 | ||
141 | av_dict_set(metadata, name, ap, AV_DICT_DONT_STRDUP_VAL); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | ||
147 | int ff_tadd_doubles_metadata(int count, const char *name, const char *sep, | |
148 | GetByteContext *gb, int le, AVDictionary **metadata) | |
149 | { | |
150 | AVBPrint bp; | |
151 | char *ap; | |
152 | int i; | |
153 | ||
154 | if (count >= INT_MAX / sizeof(int64_t) || count <= 0) | |
155 | return AVERROR_INVALIDDATA; | |
156 | if (bytestream2_get_bytes_left(gb) < count * sizeof(int64_t)) | |
157 | return AVERROR_INVALIDDATA; | |
158 | ||
159 | av_bprint_init(&bp, 10 * count, 100 * count); | |
160 | ||
161 | for (i = 0; i < count; i++) { | |
162 | av_bprintf(&bp, "%s%.15g", auto_sep(count, sep, i, 4), ff_tget_double(gb, le)); | |
163 | } | |
164 | ||
165 | if ((i = av_bprint_finalize(&bp, &ap))) { | |
166 | return i; | |
167 | } | |
168 | if (!ap) { | |
169 | return AVERROR(ENOMEM); | |
170 | } | |
171 | ||
172 | av_dict_set(metadata, name, ap, AV_DICT_DONT_STRDUP_VAL); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | ||
178 | int ff_tadd_shorts_metadata(int count, const char *name, const char *sep, | |
179 | GetByteContext *gb, int le, int is_signed, AVDictionary **metadata) | |
180 | { | |
181 | AVBPrint bp; | |
182 | char *ap; | |
183 | int i; | |
184 | ||
185 | if (count >= INT_MAX / sizeof(int16_t) || count <= 0) | |
186 | return AVERROR_INVALIDDATA; | |
187 | if (bytestream2_get_bytes_left(gb) < count * sizeof(int16_t)) | |
188 | return AVERROR_INVALIDDATA; | |
189 | ||
190 | av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_UNLIMITED); | |
191 | ||
192 | for (i = 0; i < count; i++) { | |
193 | int v = is_signed ? (int16_t)ff_tget_short(gb, le) : ff_tget_short(gb, le); | |
194 | av_bprintf(&bp, "%s%5i", auto_sep(count, sep, i, 8), v); | |
195 | } | |
196 | ||
197 | if ((i = av_bprint_finalize(&bp, &ap))) { | |
198 | return i; | |
199 | } | |
200 | if (!ap) { | |
201 | return AVERROR(ENOMEM); | |
202 | } | |
203 | ||
204 | av_dict_set(metadata, name, ap, AV_DICT_DONT_STRDUP_VAL); | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | ||
210 | int ff_tadd_bytes_metadata(int count, const char *name, const char *sep, | |
211 | GetByteContext *gb, int le, int is_signed, AVDictionary **metadata) | |
212 | { | |
213 | AVBPrint bp; | |
214 | char *ap; | |
215 | int i; | |
216 | ||
217 | if (count >= INT_MAX / sizeof(int8_t) || count < 0) | |
218 | return AVERROR_INVALIDDATA; | |
219 | if (bytestream2_get_bytes_left(gb) < count * sizeof(int8_t)) | |
220 | return AVERROR_INVALIDDATA; | |
221 | ||
222 | av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_UNLIMITED); | |
223 | ||
224 | for (i = 0; i < count; i++) { | |
225 | int v = is_signed ? (int8_t)bytestream2_get_byte(gb) : bytestream2_get_byte(gb); | |
226 | av_bprintf(&bp, "%s%3i", auto_sep(count, sep, i, 16), v); | |
227 | } | |
228 | ||
229 | if ((i = av_bprint_finalize(&bp, &ap))) { | |
230 | return i; | |
231 | } | |
232 | if (!ap) { | |
233 | return AVERROR(ENOMEM); | |
234 | } | |
235 | ||
236 | av_dict_set(metadata, name, ap, AV_DICT_DONT_STRDUP_VAL); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | int ff_tadd_string_metadata(int count, const char *name, | |
242 | GetByteContext *gb, int le, AVDictionary **metadata) | |
243 | { | |
244 | char *value; | |
245 | ||
246 | if (bytestream2_get_bytes_left(gb) < count || count < 0) | |
247 | return AVERROR_INVALIDDATA; | |
248 | ||
249 | value = av_malloc(count + 1); | |
250 | if (!value) | |
251 | return AVERROR(ENOMEM); | |
252 | ||
253 | bytestream2_get_bufferu(gb, value, count); | |
254 | value[count] = 0; | |
255 | ||
256 | av_dict_set(metadata, name, value, AV_DICT_DONT_STRDUP_VAL); | |
257 | return 0; | |
258 | } | |
259 | ||
260 | ||
261 | int ff_tdecode_header(GetByteContext *gb, int *le, int *ifd_offset) | |
262 | { | |
263 | if (bytestream2_get_bytes_left(gb) < 8) { | |
264 | return AVERROR_INVALIDDATA; | |
265 | } | |
266 | ||
267 | *le = bytestream2_get_le16u(gb); | |
268 | if (*le == AV_RB16("II")) { | |
269 | *le = 1; | |
270 | } else if (*le == AV_RB16("MM")) { | |
271 | *le = 0; | |
272 | } else { | |
273 | return AVERROR_INVALIDDATA; | |
274 | } | |
275 | ||
276 | if (ff_tget_short(gb, *le) != 42) { | |
277 | return AVERROR_INVALIDDATA; | |
278 | } | |
279 | ||
280 | *ifd_offset = ff_tget_long(gb, *le); | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | ||
286 | int ff_tread_tag(GetByteContext *gb, int le, unsigned *tag, unsigned *type, | |
287 | unsigned *count, int *next) | |
288 | { | |
289 | int ifd_tag; | |
290 | int valid_type; | |
291 | ||
292 | *tag = ff_tget_short(gb, le); | |
293 | *type = ff_tget_short(gb, le); | |
294 | *count = ff_tget_long (gb, le); | |
295 | ||
296 | ifd_tag = ff_tis_ifd(*tag); | |
297 | valid_type = *type != 0 && *type < FF_ARRAY_ELEMS(type_sizes); | |
298 | ||
299 | *next = bytestream2_tell(gb) + 4; | |
300 | ||
301 | // check for valid type | |
302 | if (!valid_type) { | |
303 | return AVERROR_INVALIDDATA; | |
304 | } | |
305 | ||
306 | // seek to offset if this is an IFD-tag or | |
307 | // if count values do not fit into the offset value | |
308 | if (ifd_tag || (*count > 4 || !(type_sizes[*type] * (*count) <= 4 || *type == TIFF_STRING))) { | |
309 | bytestream2_seek(gb, ff_tget_long (gb, le), SEEK_SET); | |
310 | } | |
311 | ||
312 | return 0; | |
313 | } |