added wxImage::CanRead

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3421 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
1999-08-18 21:22:54 +00:00
parent cae5359f18
commit 0828c0875e
8 changed files with 84 additions and 15 deletions
--- a/src/common/imaggif.cpp
+++ b/src/common/imaggif.cpp
@@ -66,4 +66,13 @@ bool wxGIFHandler::SaveFile( wxImage * WXUNUSED(image),
    return FALSE;
 }

+bool wxGIFHandler::CanRead( wxInputStream& stream )
+{
+    unsigned char hdr[5];
+    
+    stream.Read(&hdr, 5);
+    stream.SeekI(-5, wxFromCurrent);
+    return (hdr[0] == 'G' && hdr[1] == 'I' && hdr[2] == 'F' && hdr[3] == '8' && hdr[4] == '9');
+}
+
 #endif