| 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 | } |