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better feof() handling in gif load 

Relaxing the read error rules made looping possible .. make sure we
always stop explicitly on eof.
This commit is contained in:
John Cupitt 2019-08-24 17:14:10 +01:00
parent 038409093f
commit 4691260540
2 changed files with 10 additions and 8 deletions
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1
ChangeLog
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@ -10,6 +10,7 @@
- fix a problem with shinkv tail processing [angelmixu]
- fix a read one byte beyond buffer bug in jpegload
- make GIF parsing less strict
- better feof() handling in GIF load
- clip coding and interpretation on vips image read
24/5/19 started 8.8.1

17
libvips/foreign/gifload.c
View File

@ -191,7 +191,6 @@ typedef struct _VipsForeignLoadGif {
/* Params for DGifOpen(). Set by subclasses, called by base class in
* _open().
*/
void *userPtr;
InputFunc read_func;
} VipsForeignLoadGif;
@ -1052,13 +1051,13 @@ vips_foreign_load_gif_open( VipsForeignLoadGif *gif )
{
int error;
if( !(gif->file = DGifOpen( gif->userPtr, gif->read_func, &error )) ) {
if( !(gif->file = DGifOpen( gif, gif->read_func, &error )) ) {
vips_foreign_load_gif_error_vips( gif, error );
return( -1 );
}
}
#else
if( !(gif->file = DGifOpen( gif->userPtr, gif->read_func )) ) {
if( !(gif->file = DGifOpen( gif, gif->read_func )) ) {
vips_foreign_load_gif_error_vips( gif, GifLastError() );
return( -1 );
}
@ -1161,11 +1160,15 @@ vips_foreign_load_gif_file_dispose( GObject *gobject )
* across DLL boundaries on Windows.
*/
static int
vips_giflib_file_read( GifFileType *file, GifByteType *buffer, int n )
vips_giflib_file_read( GifFileType *gfile, GifByteType *buffer, int n )
{
FILE *fp = (FILE *) file->UserData;
VipsForeignLoadGif *gif = (VipsForeignLoadGif *) gfile->UserData;
VipsForeignLoadGifFile *file = (VipsForeignLoadGifFile *) gif;
return( (int) fread( (void *) buffer, 1, n, fp ) );
if( feof( file->fp ) )
gif->eof = TRUE;
return( (int) fread( (void *) buffer, 1, n, file->fp ) );
}
static int
@ -1185,7 +1188,6 @@ vips_foreign_load_gif_file_open( VipsForeignLoadGif *gif )
rewind( file->fp );
vips_foreign_load_gif_close( gif );
gif->userPtr = file->fp;
gif->read_func = vips_giflib_file_read;
return( VIPS_FOREIGN_LOAD_GIF_CLASS(
@ -1279,7 +1281,6 @@ vips_foreign_load_gif_buffer_open( VipsForeignLoadGif *gif )
vips_foreign_load_gif_close( gif );
buffer->p = buffer->buf->data;
buffer->bytes_to_go = buffer->buf->length;
gif->userPtr = gif;
gif->read_func = vips_giflib_buffer_read;;
return( VIPS_FOREIGN_LOAD_GIF_CLASS(