X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/bdffd806c3441e1d640c445ff785f5f1ea10298d..a9cb577a6f19ea0d3bf0d59c988df9e002b29110:/src/common/imagpng.cpp

diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp
index 9320f2f371..b1fea3c1fe 100644
--- a/src/common/imagpng.cpp
+++ b/src/common/imagpng.cpp
@@ -418,9 +418,10 @@ bool wxPNGHandler::DoCanRead( wxInputStream& stream )
 {
     unsigned char hdr[4];
 
-    stream.Read(hdr, 4);
-    stream.SeekI(-4, wxFromCurrent);
-    return (hdr[0] == 0x89 && hdr[1] == 'P' && hdr[2] == 'N' && hdr[3] == 'G');
+    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
+        return FALSE;
+
+    return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0;
 }
 
 #endif  // wxUSE_STREAMS