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pngdec.c: add support for 'eXIf' tag

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Test file created with exiftool 12.76:

```
exiftool test_app1_exif.png -exif:all \
  -exif:DocumentName=test_multi_exif.png -o test_multi_exif.png
```

Bug: webp:398066379
Change-Id: I1437390a70f5708421683eb69c588624bb376baa
This commit is contained in:
James Zern 2025-02-28 12:53:41 -08:00
parent 319860e919
commit 565da14882
1 changed files with 14 additions and 0 deletions
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14
imageio/pngdec.c
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@ -161,6 +161,20 @@ static int ExtractMetadataFromPNG(png_structp png,
png_textp text = NULL;
const png_uint_32 num = png_get_text(png, info, &text, NULL);
png_uint_32 i;
#ifdef PNG_eXIf_SUPPORTED
// Look for an 'eXIf' tag. Preference is given to this tag as it's newer
// than the TextualData tags.
{
png_bytep exif;
png_uint_32 len;
if (png_get_eXIf_1(png, info, &len, &exif) == PNG_INFO_eXIf) {
if (!MetadataCopy((const char*)exif, len, &metadata->exif)) return 0;
}
}
#endif // PNG_eXIf_SUPPORTED
// Look for EXIF / XMP metadata.
for (i = 0; i < num; ++i, ++text) {
int j;