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plug-ins: fix #8553 GIMP 2.99.12 Cannot Open WebP Files

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GIMP tried to open webp files as ani (animated cursor) files. The reason
for this is that for ani we had set the file magic as the first 4 bytes
should be RIFF.

However, RIFF is a container format, used by many different file formats,
among which is also webp.
This means that checking for RIFF is not specific enough.

Based on the info on http://fileformats.archiveteam.org/wiki/ANI
we will check the 4 bytes starting at offset 8 for ACON, which is
apparently the identifying part for animated icons.
This commit is contained in:
Jacob Boerema 2022-08-30 15:33:04 -04:00
parent 6324f3f142
commit 85134478c7
1 changed files with 1 additions and 1 deletions
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2
plug-ins/file-ico/ico.c
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@ -242,7 +242,7 @@ ico_create_procedure (GimpPlugIn *plug_in,
gimp_file_procedure_set_extensions (GIMP_FILE_PROCEDURE (procedure),
"ani");
gimp_file_procedure_set_magics (GIMP_FILE_PROCEDURE (procedure),
"0,string,RIFF");
"8,string,ACON");
gimp_load_procedure_set_thumbnail_loader (GIMP_LOAD_PROCEDURE (procedure),
LOAD_ANI_THUMB_PROC);