X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e34f4f195d204ca8eb94c651f8bed85e1820c368..ee682a94cb9ea835c9b74a12f17b0fb63f43dcce:/src/common/gifdecod.cpp

diff --git a/src/common/gifdecod.cpp b/src/common/gifdecod.cpp
index 011d8cf3ad..784d7bdfab 100644
--- a/src/common/gifdecod.cpp
+++ b/src/common/gifdecod.cpp
@@ -617,10 +617,12 @@ bool wxGIFDecoder::CanRead()
 {
     unsigned char buf[3];
 
-    m_f->Read(buf, 3);
-    m_f->SeekI(-3, wxFromCurrent);
+    if ( !m_f->Read(buf, WXSIZEOF(buf)) )
+        return FALSE;
+
+    m_f->SeekI(-(off_t)WXSIZEOF(buf), wxFromCurrent);
 
-    return (memcmp(buf, "GIF", 3) == 0);
+    return memcmp(buf, "GIF", WXSIZEOF(buf)) == 0;
 }