static void
exif_mnote_data_pentax_free (ExifMnoteData *n)
{
if (!n) return;
exif_mnote_data_pentax_clear ((ExifMnoteDataPentax *) n);
}
static void
exif_mnote_data_pentax_load (ExifMnoteData *en,
const unsigned char *buf, unsigned int buf_size)
{
ExifMnoteDataPentax *n = (ExifMnoteDataPentax *) en;
size_t i, tcount, o, datao, base = 0;
ExifShort c;
if (!n || !buf || !buf_size) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataPentax", "Short MakerNote");
return;
}
datao = 6 + n->offset;
if ((datao + 8 < datao) || (datao + 8 < 8) || (datao + 8 > buf_size)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataPentax", "Short MakerNote");
return;
}
/* Detect variant of Pentax/Casio MakerNote found */
if (!memcmp(buf + datao, "AOC", 4)) {
if ((buf[datao + 4] == 'I') && (buf[datao + 5] == 'I')) {
n->version = pentaxV3;
n->order = EXIF_BYTE_ORDER_INTEL;
} else if ((buf[datao + 4] == 'M') && (buf[datao + 5] == 'M')) {
n->version = pentaxV3;
n->order = EXIF_BYTE_ORDER_MOTOROLA;
} else {
/* Uses Casio v2 tags */
n->version = pentaxV2;
}
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataPentax",
"Parsing Pentax maker note v%d...", (int)n->version);
datao += 4 + 2;
base = MNOTE_PENTAX2_TAG_BASE;
} else if (!memcmp(buf + datao, "QVC", 4)) {
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataPentax",
"Parsing Casio maker note v2...");
n->version = casioV2;
base = MNOTE_CASIO2_TAG_BASE;
datao += 4 + 2;
} else {
/* probably assert(!memcmp(buf + datao, "\x00\x1b", 2)) */
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataPentax",
"Parsing Pentax maker note v1...");
n->version = pentaxV1;
}
/* Read the number of tags */
c = exif_get_short (buf + datao, n->order);
datao += 2;
/* Remove any old entries */
exif_mnote_data_pentax_clear (n);
/* Reserve enough space for all the possible MakerNote tags */
n->entries = exif_mem_alloc (en->mem, sizeof (MnotePentaxEntry) * c);
if (!n->entries) {
EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteDataPentax", sizeof (MnotePentaxEntry) * c);
return;
}
/* Parse all c entries, storing ones that are successfully parsed */
tcount = 0;
for (i = c, o = datao; i; --i, o += 12) {
size_t s;
if ((o + 12 < o) || (o + 12 < 12) || (o + 12 > buf_size)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataPentax", "Short MakerNote");
break;
}
n->entries[tcount].tag = exif_get_short (buf + o + 0, n->order) + base;
n->entries[tcount].format = exif_get_short (buf + o + 2, n->order);
n->entries[tcount].components = exif_get_long (buf + o + 4, n->order);
n->entries[tcount].order = n->order;
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnotePentax",
"Loading entry 0x%x ('%s')...", n->entries[tcount].tag,
mnote_pentax_tag_get_name (n->entries[tcount].tag));
/*
* Size? If bigger than 4 bytes, the actual data is not
* in the entry but somewhere else (offset).
*/
s = exif_format_get_size (n->entries[tcount].format) *
n->entries[tcount].components;
n->entries[tcount].size = s;
if (s) {
size_t dataofs = o + 8;
if (s > 4)
/* The data in this case is merely a pointer */
dataofs = exif_get_long (buf + dataofs, n->order) + 6;
if ((dataofs + s < dataofs) || (dataofs + s < s) ||
(dataofs + s > buf_size)) {
exif_log (en->log, EXIF_LOG_CODE_DEBUG,
"ExifMnoteDataPentax", "Tag data past end "
"of buffer (%u > %u)", dataofs + s, buf_size);
continue;
}
n->entries[tcount].data = exif_mem_alloc (en->mem, s);
if (!n->entries[tcount].data) {
EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteDataPentax", s);
continue;
}
memcpy (n->entries[tcount].data, buf + dataofs, s);
}
/* Tag was successfully parsed */
++tcount;
}
/* Store the count of successfully parsed tags */
n->count = tcount;
}
