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info: decode JPEGs from all CR2 IFDs

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This commit is contained in:
Přemysl Eric Janouch
2023-06-08 18:58:21 +02:00
parent 7dda3bd1ed
commit 34388b93ea
1 changed files with 8 additions and 4 deletions
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12
tools/info.h
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@@ -247,19 +247,23 @@ parse_exif_ifd(struct tiffer *T, const struct tiff_entry *info)
}
// This is how Exif specifies it, which doesn't follow TIFF 6.0.
if (info == tiff_entries && compression == TIFF_Compression_JPEG &&
// Also support CR2 IFD1, which isn't tagged with compression at all.
if (info == tiff_entries && /* compression == TIFF_Compression_JPEG && */
jpeg > 0 && jpeg_length > 0 &&
jpeg + jpeg_length < (T->end - T->begin)) {
jpeg + jpeg_length <= (T->end - T->begin)) {
ifd = jv_set(ifd, jv_string("JPEG image data"),
parse_jpeg(
jv_object(), T->begin + jpeg, jpeg_length));
}
// As specified by DRAFT TIFF Technical Note 2 + TIFFphotoshop.pdf.
// Theoretically, there may be more strips, but this is not expected.
// Also support CR2 IFD0, which is tagged with the "wrong" compression.
if (info == tiff_entries &&
compression == TIFF_Compression_JPEGDatastream &&
(compression == TIFF_Compression_JPEGDatastream ||
compression == TIFF_Compression_JPEG) &&
strip_offsets > 0 && strip_byte_counts > 0 &&
strip_offsets + strip_byte_counts < (T->end - T->begin)) {
strip_offsets + strip_byte_counts <= (T->end - T->begin)) {
ifd = jv_set(ifd, jv_string("JPEG image data"),
parse_jpeg(
jv_object(), T->begin + strip_offsets, strip_byte_counts));