示例#1
0
static void
exif_mnote_data_olympus_free (ExifMnoteData *n)
{
	if (!n) return;

	exif_mnote_data_olympus_clear ((ExifMnoteDataOlympus *) n);
}
示例#2
0
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;
}
示例#3
0
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);
	}
}