8000 Reading UCS-2 encoded UserComment tag · Issue #101 · libexif/libexif · GitHub
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Reading UCS-2 encoded UserComment tag #101
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Reading UCS-2 encoded UserComment tag#101
@akash-akya

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@akash-akya
akash-akya
opened on Apr 4, 2023

Hi, it looks like libexif does not support reading UCS-2 encoded UserComment tag (?).
I know that the spec is unclear about this, I just wanted to know what is the current
stance on this. Some of the tools does recognize this and decodes the tags correctly.

229839123-b8b7228d-c1e0-4843-80fd-764a2832abf1

For example, metadata2go reads this as:

Character concept design, hd Steps: 22, Sampler: DPM++ 2M Karras, CFG scale: 7, Seed: 4105013426, Face restoration: > CodeFormer, Size: 400x600, Model hash: e6415c4892, Model: realisticVisionV20_v20

I see this comment about decoding mentioned here:

libexif/libexif/exif-entry.c

Lines 929 to 931 in 1ce27bb

/* FIXME: use iconv to convert into the locale encoding.
* EXIF 2.2 implies (but does not say) that this encoding is
* UCS-2.

And cmiiw, it seems we do have a helper function to decode the string?

libexif/libexif/exif-utils.c

Lines 216 to 220 in 1ce27bb

/*! This function converts rather UCS-2LE than UTF-16 to UTF-8.
* It should really be replaced by iconv().
*/
void
exif_convert_utf16_to_utf8 (char *out, const unsigned char *in, int maxlen)

Thanks!

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