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heifload: simplify is_a check of first 4 bytes 

Allow multiples of 4, up to 32, as chunk length
This commit is contained in:
Lovell Fuller 2020-09-23 15:39:33 +01:00
parent 01bbef36d5
commit aa052da22d
1 changed files with 2 additions and 5 deletions
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7
libvips/foreign/heifload.c
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@ -260,14 +260,11 @@ static const char *heif_magic[] = {
static int
vips_foreign_load_heif_is_a( const char *buf, int len )
{
static unsigned char iso[4] = { 0, 0, 0, 24 };
static unsigned char three_gp[4] = { 0, 0, 0, 32 };
if( len >= 12 ) {
int i;
if( memcmp( buf, iso, 4 ) != 0 &&
memcmp( buf, three_gp, 4 ) != 0 )
const guint32 chunk_len = GUINT_FROM_BE( *buf );
if( chunk_len > 32 || chunk_len % 4 != 0 )
return ( 0 );
for( i = 0; i < VIPS_NUMBER( heif_magic ); i++ )