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revise heif sniffing again

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This commit is contained in:
John Cupitt 2020-09-23 21:03:22 +01:00
parent b6276dd44d
commit 8d52c8b761
1 changed files with 5 additions and 3 deletions
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8
libvips/foreign/heifload.c
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@ -261,11 +261,13 @@ static int
vips_foreign_load_heif_is_a( const char *buf, int len ) vips_foreign_load_heif_is_a( const char *buf, int len )
{ {
if( len >= 12 ) { if( len >= 12 ) {
const guint chunk_len = GUINT_FROM_BE( *((guint32 *) buf) );
int i; int i;
const guint32 chunk_len = GUINT_FROM_BE( *buf ); if( chunk_len > 32 ||
if( chunk_len > 32 || chunk_len % 4 != 0 ) chunk_len % 4 != 0 )
return ( 0 ); return( 0 );
for( i = 0; i < VIPS_NUMBER( heif_magic ); i++ ) for( i = 0; i < VIPS_NUMBER( heif_magic ); i++ )
if( strncmp( buf + 4, heif_magic[i], 8 ) == 0 ) if( strncmp( buf + 4, heif_magic[i], 8 ) == 0 )