Disable fflush() of read-only handle under Microsoft Windows

diff --git a/MagickCore/blob.c b/MagickCore/blob.c
index c4ec92b9e4c2c9e9b12ede3624750d038a2652f2..cb6a7aa833b6c74b4657785121ef6265dd3ba53b 100755 (executable)
--- a/MagickCore/blob.c
+++ b/MagickCore/blob.c
@@ -2577,6 +2577,9 @@ MagickExport MagickBooleanType OpenBlob(const ImageInfo *image_info,
             (void) ResetMagickMemory(magick,0,sizeof(magick));
             count=fread(magick,1,sizeof(magick),image->blob->file_info.file);
             (void) fseek(image->blob->file_info.file,-((off_t) count),SEEK_CUR);
+#if defined(MAGICKCORE_POSIX_SUPPORT)
+            (void) fflush(image->blob->file_info.file);
+#endif
             (void) LogMagickEvent(BlobEvent,GetMagickModule(),
                "  read %.20g magic header bytes",(double) count);
 #if defined(MAGICKCORE_ZLIB_DELEGATE)