Add wxGetFileType and IsSeekable

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31924 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/archive/archivetest.h

@@ -38,6 +38,7 @@ public:
 
     int GetOptions() const { return m_options; }
     wxFileOffset GetLength() const { return m_size; }
+    bool IsSeekable() const { return (m_options & PipeOut) == 0; }
 
     // gives away the data, this stream is then empty, and can be reused
     void GetData(char*& data, size_t& size);
@@ -67,6 +68,7 @@ public:
 
     void Rewind();
     wxFileOffset GetLength() const { return m_size; }
+    bool IsSeekable() const { return (m_options & PipeIn) == 0; }
     void SetData(TestOutputStream& out);
 
 private: