/* Read a few bytes from the start of a file. For sniffing file types.
* Filename may contain a mode.
*/
int
vips__get_bytes( const char *filename, unsigned char buf[], int len )
{
char name[FILENAME_MAX];
char mode[FILENAME_MAX];
int fd;
/* Split off the mode part.
*/
im_filename_split( filename, name, mode );
/* File may not even exist (for tmp images for example!)
* so no hasty messages. And the file might be truncated, so no error
* on read either.
*/
if( (fd = vips__open_read( name )) == -1 )
return( 0 );
if( read( fd, buf, len ) != len ) {
close( fd );
return( 0 );
}
close( fd );
return( 1 );
}
/* Read a few bytes from the start of a file. This is used for sniffing file
* types, so we must read binary.
*
* Return the number of bytes actually read (the file might be shorter than
* len), or 0 for error.
*/
guint64
vips__get_bytes( const char *filename, unsigned char buf[], guint64 len )
{
int fd;
guint64 bytes_read;
/* File may not even exist (for tmp images for example!)
* so no hasty messages. And the file might be truncated, so no error
* on read either.
*/
if( (fd = vips__open_read( filename )) == -1 )
return( 0 );
bytes_read = read( fd, buf, len );
close( fd );
return( bytes_read );
}
