VC 7.1 warning fix

[wxWidgets.git] / src / common / imagiff.cpp

diff --git a/src/common/imagiff.cpp b/src/common/imagiff.cpp
index 68dc35b1afda58931b67f4f67bd7ce95f523f596..432982552a2fc4c170ba386e07f73aab0f7697dd 100644 (file)
--- a/src/common/imagiff.cpp
+++ b/src/common/imagiff.cpp
@@ -1,14 +1,16 @@
 /////////////////////////////////////////////////////////////////////////////
 // Name:        imagiff.h
 // Purpose:     wxImage handler for Amiga IFF images
-// Author:      Steffen Gutmann
+// Author:      Steffen Gutmann, Thomas Meyer
 // RCS-ID:      $Id$
 // Copyright:   (c) Steffen Gutmann, 2002
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-//        parts of the source are based on xviff by Thomas Meyer
-//        Permission for use in wxWindows has been gratefully given.
+// Parts of this source are based on the iff loading algorithm found
+// in xviff.c.  Permission by the original author, Thomas Meyer, and
+// by the author of xv, John Bradley for using the iff loading part
+// in wxWindows has been gratefully given.
 
 #ifdef __GNUG__
 #pragma implementation "imagiff.h"
@@ -32,6 +34,10 @@
 #include "wx/log.h"
 #include "wx/intl.h"
 
+#if wxUSE_PALETTE
+    #include "wx/palette.h"
+#endif // wxUSE_PALETTE
+
 #include <stdlib.h>
 #include <string.h>
 
@@ -228,12 +234,14 @@ int wxIFFDecoder::GetTransparentColour() const { return m_image->transparent; }
 //
 bool wxIFFDecoder::CanRead()
 {
-    unsigned char buf[12] = "";
+    unsigned char buf[12];
 
-    m_f->Read(buf, 12);
-    m_f->SeekI(-12, wxFromCurrent);
+    if ( !m_f->Read(buf, WXSIZEOF(buf)) )
+        return FALSE;
+
+    m_f->SeekI(-(off_t)WXSIZEOF(buf), wxFromCurrent);
 
-    return (memcmp(buf, "FORM", 4) == 0 && memcmp(buf+8, "ILBM", 4) == 0);
+    return (memcmp(buf, "FORM", 4) == 0) && (memcmp(buf+8, "ILBM", 4) == 0);
 }
 
 
@@ -781,14 +789,9 @@ bool wxIFFHandler::SaveFile(wxImage * WXUNUSED(image),
 
 bool wxIFFHandler::DoCanRead(wxInputStream& stream)
 {
-    wxIFFDecoder *decod;
-    bool ok;
+    wxIFFDecoder decod(&stream);
 
-    decod = new wxIFFDecoder(&stream);
-    ok = decod->CanRead();
-    delete decod;
-
-    return ok;
+    return decod.CanRead();
 }
 
 #endif // wxUSE_STREAMS