File size: 8,438 Bytes
fc87544 |
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 |
/* exif-mnote-data-apple.c
*
* Copyright (c) 2018 zhanwang-sky <[email protected]>
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include "exif-mnote-data-apple.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libexif/exif-data.h>
#include <libexif/exif-utils.h>
static void
exif_mnote_data_apple_free(ExifMnoteData *md) {
ExifMnoteDataApple *d = (ExifMnoteDataApple *) md;
unsigned int i;
/*printf("%s\n", __FUNCTION__);*/
if (!d) {
return;
}
if (d->entries) {
for (i = 0; i < d->count; i++) {
if (d->entries[i].data) {
exif_mem_free(md->mem, d->entries[i].data);
}
}
exif_mem_free(md->mem, d->entries);
d->entries = NULL;
d->count = 0;
}
return;
}
static void
exif_mnote_data_apple_load(ExifMnoteData *md, const unsigned char *buf, unsigned int buf_size) {
ExifMnoteDataApple *d = (ExifMnoteDataApple *) md;
unsigned int tcount, i;
unsigned int dsize;
unsigned int ofs, dofs;
/*printf("%s\n", __FUNCTION__);*/
if (!d || !buf || (buf_size < 6 + 16)) {
exif_log(md->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataApple", "Short MakerNote");
return;
}
/* Start of interesting data */
ofs = d->offset + 6;
if ((buf[ofs + 12] == 'M') && (buf[ofs + 13] == 'M')) {
d->order = EXIF_BYTE_ORDER_MOTOROLA;
} else if ((buf[ofs + 12] == 'I') && (buf[ofs + 13] == 'I')) {
d->order = EXIF_BYTE_ORDER_INTEL;
} else {
exif_log(md->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataApple", "Unrecognized byte order");
/*printf("%s(%d)\n", __FUNCTION__, __LINE__);*/
return;
}
tcount = (unsigned int) exif_get_short(buf + ofs + 14, d->order);
/* Sanity check the offset */
if (buf_size < d->offset + 6 + 16 + tcount * 12 + 4) {
exif_log(md->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataApple", "Short MakerNote");
/*printf("%s(%d)\n", __FUNCTION__, __LINE__);*/
return;
}
memset(d->entries, 0, sizeof(MnoteAppleEntry) * tcount);
/* printf("%s(%d): total %d tags\n", __FUNCTION__, __LINE__, tcount); */
ofs += 16;
exif_mnote_data_apple_free(md);
/* Reserve enough space for all the possible MakerNote tags */
d->entries = exif_mem_alloc(md->mem, sizeof(MnoteAppleEntry) * tcount);
if (!d->entries) {
EXIF_LOG_NO_MEMORY(md->log, "ExifMnoteApple", sizeof(MnoteAppleEntry) * tcount);
/*printf("%s(%d)\n", __FUNCTION__, __LINE__);*/
return;
}
for (i = 0; i < tcount; i++) {
if (ofs + 12 > buf_size) {
exif_log (md->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteApplet", "Tag size overflow detected (%u vs size %u)", ofs + 12, buf_size);
break;
}
d->entries[i].tag = exif_get_short(buf + ofs, d->order);
d->entries[i].format = exif_get_short(buf + ofs + 2, d->order);
d->entries[i].components = exif_get_long(buf + ofs + 4, d->order);
d->entries[i].order = d->order;
dsize = exif_format_get_size(d->entries[i].format) * d->entries[i].components;
if (dsize > 4) {
dofs = d->offset + exif_get_long(buf + ofs + 8, d->order);
} else {
dofs = ofs + 8;
}
if (dofs > buf_size) {
exif_log (md->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteApplet", "Tag size overflow detected (%u vs size %u)", dofs, buf_size);
continue;
}
ofs += 12;
d->entries[i].data = exif_mem_alloc(md->mem, dsize);
if (!d->entries[i].data) {
EXIF_LOG_NO_MEMORY(md->log, "ExifMnoteApple", dsize);
continue;
}
if (dofs + dsize > buf_size) {
exif_log(md->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteApplet", "Tag size overflow detected (%u vs size %u)", dofs + dsize, buf_size);
continue;
}
memcpy(d->entries[i].data, buf + dofs, dsize);
d->entries[i].size = dsize;
}
d->count = tcount;
return;
}
static void
exif_mnote_data_apple_set_offset(ExifMnoteData *md, unsigned int o) {
/*printf("%s\n", __FUNCTION__);*/
if (md) {
((ExifMnoteDataApple *) md)->offset = o;
}
return;
}
static void
exif_mnote_data_apple_set_byte_order(ExifMnoteData *md , ExifByteOrder o) {
ExifMnoteDataApple *d = (ExifMnoteDataApple *) md;
unsigned int i;
/*printf("%s\n", __FUNCTION__);*/
if (!d || d->order == o) {
return;
}
for (i = 0; i < d->count; i++) {
if (d->entries[i].components && (d->entries[i].size/d->entries[i].components < exif_format_get_size (d->entries[i].format)))
continue;
exif_array_set_byte_order(d->entries[i].format, d->entries[i].data,
d->entries[i].components, d->entries[i].order, o);
d->entries[i].order = o;
}
d->order = o;
return;
}
static unsigned int
exif_mnote_data_apple_count(ExifMnoteData *md){
/*printf("%s\n", __FUNCTION__);*/
return md ? ((ExifMnoteDataApple *) md)->count : 0;
}
static unsigned int
exif_mnote_data_apple_get_id(ExifMnoteData *md, unsigned int i) {
ExifMnoteDataApple *d = (ExifMnoteDataApple *) md;
if (!d || (d->count <= i)) {
return 0;
}
return d->entries[i].tag;
}
static const char *
exif_mnote_data_apple_get_name(ExifMnoteData *md, unsigned int i) {
ExifMnoteDataApple *d = (ExifMnoteDataApple *) md;
if (!d || (d->count <= i)) {
return NULL;
}
return mnote_apple_tag_get_name(d->entries[i].tag);
}
static const char *
exif_mnote_data_apple_get_title(ExifMnoteData *md, unsigned int i) {
ExifMnoteDataApple *d = (ExifMnoteDataApple *) md;
if (!d || (d->count <= i)) {
return NULL;
}
return mnote_apple_tag_get_title(d->entries[i].tag);
}
static const char *
exif_mnote_data_apple_get_description(ExifMnoteData *md, unsigned int i) {
ExifMnoteDataApple *d = (ExifMnoteDataApple *) md;
if (!d || (d->count <= i)) {
return NULL;
}
return mnote_apple_tag_get_description(d->entries[i].tag);
}
static char *
exif_mnote_data_apple_get_value(ExifMnoteData *md, unsigned int i, char *val, unsigned int maxlen) {
ExifMnoteDataApple *d = (ExifMnoteDataApple *) md;
if (!val || !d || (d->count <= i)) {
return NULL;
}
return mnote_apple_entry_get_value(&d->entries[i], val, maxlen);
}
int
exif_mnote_data_apple_identify(const ExifData *ed, const ExifEntry *e) {
int variant;
if (!strcmp((const char *) e->data, "Apple iOS")) {
variant = 1;
} else {
variant = 0;
}
return variant;
}
ExifMnoteData *
exif_mnote_data_apple_new(ExifMem *mem) {
ExifMnoteData *md;
/*printf("%s\n", __FUNCTION__);*/
if (!mem) {
return NULL;
}
md = exif_mem_alloc(mem, sizeof(ExifMnoteDataApple));
if (!md) {
return NULL;
}
exif_mnote_data_construct(md, mem);
md->methods.free = exif_mnote_data_apple_free;
md->methods.load = exif_mnote_data_apple_load;
md->methods.set_offset = exif_mnote_data_apple_set_offset;
md->methods.set_byte_order = exif_mnote_data_apple_set_byte_order;
md->methods.count = exif_mnote_data_apple_count;
md->methods.get_id = exif_mnote_data_apple_get_id;
md->methods.get_name = exif_mnote_data_apple_get_name;
md->methods.get_title = exif_mnote_data_apple_get_title;
md->methods.get_description = exif_mnote_data_apple_get_description;
md->methods.get_value = exif_mnote_data_apple_get_value;
return md;
}
|