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don't pass fds into giflib either 

it seems it's probably not safe to pass fds into DLLs either, so
instead, define an InputFunction and read from the input file in that
This commit is contained in:
John Cupitt 2016-08-18 12:37:37 +01:00
parent 455acae66c
commit 04c33a35c3
1 changed files with 29 additions and 20 deletions
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49
libvips/foreign/gifload.c
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@ -99,6 +99,10 @@ typedef struct _VipsForeignLoadGif {
gboolean has_transparency;
gboolean has_colour;
/* The FILE* we read from.
*/
FILE *fp;
} VipsForeignLoadGif;
typedef VipsForeignLoadClass VipsForeignLoadGifClass;
@ -213,37 +217,44 @@ vips_foreign_load_gif_close( VipsForeignLoadGif *gif )
gif->file = NULL;
}
#endif
VIPS_FREEF( fclose, gif->fp );
}
/* Our input function for file open. We can't use DGifOpenFileName(), since
* that just calls open() and won't work with unicode on win32. We can't use
* DGifOpenFileHandle() since that's an fd from open() and you can't pass those
* acoss DLL boundaries on Windows.
*/
static int
vips_giflib_file_read( GifFileType *file, GifByteType *buffer, int n )
{
FILE *fp = (FILE *) file->UserData;
return( (int) fread( (void *) buffer, 1, n, fp ) );
}
static int
vips_foreign_load_gif_open( VipsForeignLoadGif *gif, const char *filename )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( gif );
int fd;
g_assert( !gif->file );
g_assert( !gif->fp );
if( !(fd = vips__open_read( filename )) ) {
vips_error_system( errno, class->nickname,
_( "unable to open \"%s\"" ), filename );
if( !(gif->fp = vips__file_open_read( filename, NULL, FALSE )) )
return( -1 );
}
#ifdef HAVE_GIFLIB_5
{
int error;
if( !(gif->file = DGifOpenFileHandle( fd, &error )) ) {
/* DGifOpenFileHandle() closes fd for us on error.
*/
if( !(gif->file =
DGifOpen( gif->fp, vips_giflib_file_read, &error )) ) {
vips_foreign_load_gif_error_vips( gif, error );
return( -1 );
}
}
#else
if( !(gif->file = DGifOpenFileHandle( fd )) ) {
/* DGifOpenFileHandle() closes fd for us on error.
*/
if( !(gif->file = DGifOpen( gif->fp, vips_giflib_file_read )) ) {
vips_foreign_load_gif_error_vips( gif, GifLastError() );
return( -1 );
}
@ -768,12 +779,11 @@ G_DEFINE_TYPE( VipsForeignLoadGifBuffer, vips_foreign_load_gif_buffer,
* Read up to len bytes into buffer, return number of bytes read, 0 for EOF.
*/
static int
vips_foreign_load_gif_buffer_read( GifFileType *file,
GifByteType *buf, int len )
vips_giflib_buffer_read( GifFileType *file, GifByteType *buf, int n )
{
VipsForeignLoadGifBuffer *buffer = (VipsForeignLoadGifBuffer *)
file->UserData;
size_t will_read = VIPS_MIN( len, buffer->bytes_to_go );
VipsForeignLoadGifBuffer *buffer =
(VipsForeignLoadGifBuffer *) file->UserData;
size_t will_read = VIPS_MIN( n, buffer->bytes_to_go );
memcpy( buf, buffer->p, will_read );
buffer->p += will_read;
@ -793,8 +803,7 @@ vips_foreign_load_gif_buffer_header( VipsForeignLoad *load )
buffer->p = buffer->buf->data;
buffer->bytes_to_go = buffer->buf->length;
if( vips_foreign_load_gif_open_buffer( gif,
vips_foreign_load_gif_buffer_read ) )
if( vips_foreign_load_gif_open_buffer( gif, vips_giflib_buffer_read ) )
return( -1 );
return( vips_foreign_load_gif_load( load ) );