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exif: ensure prefix is present before parsing (#3100) 

Newer Apple devices are creating EXIF without this however libexif
still requires it due to JPEG/JFIF/APP1 marker heritage.
This commit is contained in:
Lovell Fuller 2022-10-19 12:47:23 +01:00 committed by GitHub
parent e83468e051
commit 1fc01c05e8
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 18 additions and 6 deletions
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1
ChangeLog
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@ -2,6 +2,7 @@
- improve rules for 16-bit heifsave [johntrunc]
- improve libspng pallette write [kleisauke]
- improve libspng pallette sort [DarthSim]
- ensure EXIF has prefix before parsing [lovell]
5/9/22 started 8.13.2
- in dzsave, add add missing include directive for errno/EEXIST [kleisauke]

23
libvips/foreign/exif.c
View File

@ -178,7 +178,17 @@ vips_exif_load_data_without_fix( const void *data, size_t length )
}
exif_data_unset_option( ed, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION );
exif_data_load_data( ed, data, length );
if( !vips_isprefix( "Exif", (char *) data ) ) {
/* Ensure "Exif" prefix as loaders may not provide it.
*/
void* data_with_prefix;
data_with_prefix = g_malloc0( length + 6 );
memcpy( data_with_prefix, "Exif\0\0", 6 );
memcpy( data_with_prefix + 6, data, length );
exif_data_load_data( ed, data_with_prefix, length + 6 );
g_free( data_with_prefix );
} else
exif_data_load_data( ed, data, length );
return( ed );
}
@ -1391,7 +1401,7 @@ vips__exif_update( VipsImage *image )
(void *) &data, &length ) )
return( -1 );
if( !(ed = exif_data_new_from_data( data, length )) )
if( !(ed = vips_exif_load_data_without_fix( data, length )) )
return( -1 );
}
else {
@ -1401,12 +1411,13 @@ vips__exif_update( VipsImage *image )
EXIF_DATA_OPTION_FOLLOW_SPECIFICATION );
exif_data_set_data_type( ed, EXIF_DATA_TYPE_COMPRESSED );
exif_data_set_byte_order( ed, EXIF_BYTE_ORDER_INTEL );
/* Create the mandatory EXIF fields with default data.
*/
exif_data_fix( ed );
}
/* Make sure all required fields are there before we attach the vips
* metadata.
*/
exif_data_fix( ed );
/* Update EXIF tags from the image metadata.
*/
vips_exif_update( ed, image );