static void
exif_mnote_data_olympus_free (ExifMnoteData *n)
{
if (!n) return;
exif_mnote_data_olympus_clear ((ExifMnoteDataOlympus *) n);
}
static void
exif_mnote_data_olympus_load (ExifMnoteData *en,
const unsigned char *buf, unsigned int buf_size)
{
ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) en;
ExifShort c;
size_t i, tcount, o, o2, datao = 6, base = 0;
if (!n || !buf || !buf_size) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataOlympus", "Short MakerNote");
return;
}
o2 = 6 + n->offset; /* Start of interesting data */
if ((o2 + 10 < o2) || (o2 + 10 < 10) || (o2 + 10 > buf_size)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataOlympus", "Short MakerNote");
return;
}
/*
* Olympus headers start with "OLYMP" and need to have at least
* a size of 22 bytes (6 for 'OLYMP', 2 other bytes, 2 for the
* number of entries, and 12 for one entry.
*
* Sanyo format is identical and uses identical tags except that
* header starts with "SANYO".
*
* Epson format is identical and uses identical tags except that
* header starts with "EPSON".
*
* Nikon headers start with "Nikon" (6 bytes including '\0'),
* version number (1 or 2).
*
* Version 1 continues with 0, 1, 0, number_of_tags,
* or just with number_of_tags (models D1H, D1X...).
*
* Version 2 continues with an unknown byte (0 or 10),
* two unknown bytes (0), "MM" or "II", another byte 0 and
* lastly 0x2A.
*/
if (!memcmp (buf + o2, "OLYMP", 6) || !memcmp (buf + o2, "SANYO", 6) ||
!memcmp (buf + o2, "EPSON", 6)) {
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
"Parsing Olympus/Sanyo/Epson maker note v1...");
/* The number of entries is at position 8. */
if (!memcmp (buf + o2, "SANYO", 6))
n->version = sanyoV1;
else if (!memcmp (buf + o2, "EPSON", 6))
n->version = epsonV1;
else
n->version = olympusV1;
if (buf[o2 + 6] == 1)
n->order = EXIF_BYTE_ORDER_INTEL;
else if (buf[o2 + 6 + 1] == 1)
n->order = EXIF_BYTE_ORDER_MOTOROLA;
o2 += 8;
if (o2 + 2 > buf_size) return;
c = exif_get_short (buf + o2, n->order);
if ((!(c & 0xFF)) && (c > 0x500)) {
if (n->order == EXIF_BYTE_ORDER_INTEL) {
n->order = EXIF_BYTE_ORDER_MOTOROLA;
} else {
n->order = EXIF_BYTE_ORDER_INTEL;
}
}
} else if (!memcmp (buf + o2, "OLYMPUS", 8)) {
/* Olympus S760, S770 */
datao = o2;
o2 += 8;
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
"Parsing Olympus maker note v2 (0x%02x, %02x, %02x, %02x)...",
buf[o2], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3]);
if ((buf[o2] == 'I') && (buf[o2 + 1] == 'I'))
n->order = EXIF_BYTE_ORDER_INTEL;
else if ((buf[o2] == 'M') && (buf[o2 + 1] == 'M'))
n->order = EXIF_BYTE_ORDER_MOTOROLA;
/* The number of entries is at position 8+4. */
n->version = olympusV2;
o2 += 4;
} else if (!memcmp (buf + o2, "Nikon", 6)) {
o2 += 6;
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
"Parsing Nikon maker note (0x%02x, %02x, %02x, "
"%02x, %02x, %02x, %02x, %02x)...",
buf[o2 + 0], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3],
buf[o2 + 4], buf[o2 + 5], buf[o2 + 6], buf[o2 + 7]);
/* The first byte is the version. */
if (o2 >= buf_size) return;
n->version = buf[o2];
o2 += 1;
/* Skip an unknown byte (00 or 0A). */
o2 += 1;
switch (n->version) {
case nikonV1:
base = MNOTE_NIKON1_TAG_BASE;
/* Fix endianness, if needed */
if (o2 + 2 > buf_size) return;
c = exif_get_short (buf + o2, n->order);
if ((!(c & 0xFF)) && (c > 0x500)) {
if (n->order == EXIF_BYTE_ORDER_INTEL) {
n->order = EXIF_BYTE_ORDER_MOTOROLA;
} else {
n->order = EXIF_BYTE_ORDER_INTEL;
}
}
break;
case nikonV2:
/* Skip 2 unknown bytes (00 00). */
o2 += 2;
/*
* Byte order. From here the data offset
* gets calculated.
*/
datao = o2;
if (o2 >= buf_size) return;
if (!strncmp ((char *)&buf[o2], "II", 2))
n->order = EXIF_BYTE_ORDER_INTEL;
else if (!strncmp ((char *)&buf[o2], "MM", 2))
n->order = EXIF_BYTE_ORDER_MOTOROLA;
else {
exif_log (en->log, EXIF_LOG_CODE_DEBUG,
"ExifMnoteDatalympus", "Unknown "
"byte order '%c%c'", buf[o2],
buf[o2 + 1]);
return;
}
o2 += 2;
/* Skip 2 unknown bytes (00 2A). */
o2 += 2;
/* Go to where the number of entries is. */
if (o2 + 4 > buf_size) return;
o2 = datao + exif_get_long (buf + o2, n->order);
break;
default:
exif_log (en->log, EXIF_LOG_CODE_DEBUG,
"ExifMnoteDataOlympus", "Unknown version "
"number %i.", n->version);
return;
}
} else if (!memcmp (buf + o2, "\0\x1b", 2)) {
n->version = nikonV2;
/* 00 1b is # of entries in Motorola order - the rest should also be in MM order */
n->order = EXIF_BYTE_ORDER_MOTOROLA;
} else {
return;
}
/* Sanity check the offset */
if ((o2 + 2 < o2) || (o2 + 2 < 2) || (o2 + 2 > buf_size)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteOlympus", "Short MakerNote");
return;
}
/* Read the number of tags */
c = exif_get_short (buf + o2, n->order);
o2 += 2;
/* Remove any old entries */
exif_mnote_data_olympus_clear (n);
/* Reserve enough space for all the possible MakerNote tags */
n->entries = exif_mem_alloc (en->mem, sizeof (MnoteOlympusEntry) * c);
if (!n->entries) {
EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteOlympus", sizeof (MnoteOlympusEntry) * c);
return;
}
/* Parse all c entries, storing ones that are successfully parsed */
tcount = 0;
for (i = c, o = o2; 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,
"ExifMnoteOlympus", "Short MakerNote");
break;
}
n->entries[tcount].tag = exif_get_short (buf + o, 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, "ExifMnoteOlympus",
"Loading entry 0x%x ('%s')...", n->entries[tcount].tag,
mnote_olympus_tag_get_name (n->entries[tcount].tag));
/* exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteOlympus",
"0x%x %d %ld*(%d)",
n->entries[tcount].tag,
n->entries[tcount].format,
n->entries[tcount].components,
(int)exif_format_get_size(n->entries[tcount].format)); */
/*
* 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) + datao;
#ifdef EXIF_OVERCOME_SANYO_OFFSET_BUG
/* Some Sanyo models (e.g. VPC-C5, C40) suffer from a bug when
* writing the offset for the MNOTE_OLYMPUS_TAG_THUMBNAILIMAGE
* tag in its MakerNote. The offset is actually the absolute
* position in the file instead of the position within the IFD.
*/
if (dataofs + s > buf_size && n->version == sanyoV1) {
/* fix pointer */
dataofs -= datao + 6;
exif_log (en->log, EXIF_LOG_CODE_DEBUG,
"ExifMnoteOlympus",
"Inconsistent thumbnail tag offset; attempting to recover");
}
#endif
}
if ((dataofs + s < dataofs) || (dataofs + s < s) ||
(dataofs + s > buf_size)) {
exif_log (en->log, EXIF_LOG_CODE_DEBUG,
"ExifMnoteOlympus",
"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, "ExifMnoteOlympus", 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;
}
static void
exif_mnote_data_olympus_load (ExifMnoteData *en,
const unsigned char *buf, unsigned int buf_size)
{
ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) en;
ExifShort c;
unsigned int i, s, o, o2 = 0, datao = 6, base = 0;
if (!n || !buf) return;
/* Start of interesting data */
o2 = 6 + n->offset;
/*
* Olympus headers start with "OLYMP" and need to have at least
* a size of 22 bytes (6 for 'OLYMP', 2 other bytes, 2 for the
* number of entries, and 12 for one entry.
*
* Nikon headers start with "Nikon" (6 bytes including '\0'),
* version number (1 or 2).
*
* Version 1 continues with 0, 1, 0, number_of_tags,
* or just with number_of_tags (models D1H, D1X...).
*
* Version 2 continues with an unknown byte (0 or 10),
* two unknown bytes (0), "MM" or "II", another byte 0 and
* lastly 0x2A.
*/
if (buf_size - n->offset < 22) return;
if (!memcmp (buf + o2, "OLYMP", 6)) {
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
"Parsing Olympus maker note v1...");
/* The number of entries is at position 8. */
n->version = olympusV1;
if (buf[o2 + 6] == 1)
n->order = EXIF_BYTE_ORDER_INTEL;
else if (buf[o2 + 6 + 1] == 1)
n->order = EXIF_BYTE_ORDER_MOTOROLA;
o2 += 8;
} else if (!memcmp (buf + o2, "OLYMPUS", 8)) {
/* Olympus S760, S770 */
datao = o2;
o2 += 8;
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
"Parsing Olympus maker note v2 (0x%02x, %02x, %02x, %02x)...",
buf[o2], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3]);
if ((buf[o2] == 'I') && (buf[o2 + 1] == 'I'))
n->order = EXIF_BYTE_ORDER_INTEL;
else if ((buf[o2] == 'M') && (buf[o2 + 1] == 'M'))
n->order = EXIF_BYTE_ORDER_MOTOROLA;
/* The number of entries is at position 8+4. */
n->version = olympusV2;
o2 += 4;
} else if (!memcmp (buf + o2, "Nikon", 6)) {
o2 += 6;
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
"Parsing Nikon maker note (0x%02x, %02x, %02x, "
"%02x, %02x, %02x, %02x, %02x)...",
buf[o2 + 0], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3],
buf[o2 + 4], buf[o2 + 5], buf[o2 + 6], buf[o2 + 7]);
/* The first byte is the version. */
if (o2 >= buf_size) return;
n->version = buf[o2];
o2 += 1;
/* Skip an unknown byte (00 or 0A). */
o2 += 1;
switch (n->version) {
case nikonV1:
base = MNOTE_NIKON1_TAG_BASE;
break;
case nikonV2:
/* Skip 2 unknown bytes (00 00). */
o2 += 2;
/*
* Byte order. From here the data offset
* gets calculated.
*/
datao = o2;
if (o2 >= buf_size) return;
if (!strncmp ((char *)&buf[o2], "II", 2))
n->order = EXIF_BYTE_ORDER_INTEL;
else if (!strncmp ((char *)&buf[o2], "MM", 2))
n->order = EXIF_BYTE_ORDER_MOTOROLA;
else {
exif_log (en->log, EXIF_LOG_CODE_DEBUG,
"ExifMnoteDatalympus", "Unknown "
"byte order '%c%c'", buf[o2],
buf[o2 + 1]);
return;
}
o2 += 2;
/* Skip 2 unknown bytes (00 2A). */
o2 += 2;
/* Go to where the number of entries is. */
if (o2 >= buf_size) return;
o2 = datao + exif_get_long (buf + o2, n->order);
break;
default:
exif_log (en->log, EXIF_LOG_CODE_DEBUG,
"ExifMnoteDataOlympus", "Unknown version "
"number %i.", n->version);
return;
}
} else if (!memcmp (buf + o2, "\0\x1b", 2)) {
n->version = nikonV2;
} else {
return;
}
/* Number of entries */
if (o2 >= buf_size) return;
c = exif_get_short (buf + o2, n->order);
o2 += 2;
/* Read the number of entries and remove old ones. */
exif_mnote_data_olympus_clear (n);
n->entries = exif_mem_alloc (en->mem, sizeof (MnoteOlympusEntry) * c);
if (!n->entries) return;
/* Parse the entries */
for (i = 0; i < c; i++) {
o = o2 + 12 * i;
if (o + 12 > buf_size) return;
n->count = i + 1;
n->entries[i].tag = exif_get_short (buf + o, n->order) + base;
n->entries[i].format = exif_get_short (buf + o + 2, n->order);
n->entries[i].components = exif_get_long (buf + o + 4, n->order);
n->entries[i].order = n->order;
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteOlympus",
"Loading entry 0x%x ('%s')...", n->entries[i].tag,
mnote_olympus_tag_get_name (n->entries[i].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[i].format) *
n->entries[i].components;
if (!s) continue;
o += 8;
if (s > 4) o = exif_get_long (buf + o, n->order) + datao;
if (o + s > buf_size) continue;
/* Sanity check */
n->entries[i].data = exif_mem_alloc (en->mem, s);
if (!n->entries[i].data) continue;
n->entries[i].size = s;
memcpy (n->entries[i].data, buf + o, s);
}
}