reuse Clear() instead of duplicating its code in Close()

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

diff --git a/src/common/stream.cpp b/src/common/stream.cpp
index 271f7490ae38c0a2c6538d5505eecb131eb41f40..73dde47896f15a1c358f7d203881d98ec6d6ffe2 100644 (file)
--- a/src/common/stream.cpp
+++ b/src/common/stream.cpp
@@ -18,10 +18,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma implementation "stream.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -121,7 +117,10 @@ wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer)
 void wxStreamBuffer::FreeBuffer()
 {
     if ( m_destroybuf )
+    {
         free(m_buffer_start);
+        m_buffer_start = NULL;
+    }
 }
 
 wxStreamBuffer::~wxStreamBuffer()
@@ -167,15 +166,15 @@ void wxStreamBuffer::SetBufferIO(void *start,
 
 void wxStreamBuffer::SetBufferIO(size_t bufsize)
 {
-    // start by freeing the old buffer
-    FreeBuffer();
-
     if ( bufsize )
     {
+        // this will free the old buffer and allocate the new one
         SetBufferIO(malloc(bufsize), bufsize, true /* take ownership */);
     }
     else // no buffer size => no buffer
     {
+        // still free the old one
+        FreeBuffer();
         InitBuffer();
     }
 }
@@ -376,14 +375,14 @@ size_t wxStreamBuffer::Read(void *buffer, size_t size)
     if ( m_stream )
         m_stream->Reset();
 
-    size_t read;
+    size_t readBytes;
     if ( !HasBuffer() )
     {
         wxInputStream *inStream = GetInputStream();
 
         wxCHECK_MSG( inStream, 0, _T("should have a stream in wxStreamBuffer") );
 
-        read = inStream->OnSysRead(buffer, size);
+        readBytes = inStream->OnSysRead(buffer, size);
     }
     else // we have a buffer, use it
     {
@@ -414,13 +413,13 @@ size_t wxStreamBuffer::Read(void *buffer, size_t size)
             }
         }
 
-        read = orig_size - size;
+        readBytes = orig_size - size;
     }
 
     if ( m_stream )
-        m_stream->m_lastcount = read;
+        m_stream->m_lastcount = readBytes;
 
-    return read;
+    return readBytes;
 }
 
 // this should really be called "Copy()"
@@ -434,7 +433,7 @@ size_t wxStreamBuffer::Read(wxStreamBuffer *dbuf)
 
     do
     {
-        nRead = Read(dbuf, WXSIZEOF(buf));
+        nRead = Read(buf, WXSIZEOF(buf));
         if ( nRead )
         {
             nRead = dbuf->Write(buf, nRead);
@@ -580,7 +579,7 @@ wxFileOffset wxStreamBuffer::Seek(wxFileOffset pos, wxSeekMode mode)
         }
         if (diff < 0 || diff > last_access)
             return wxInvalidOffset;
-        size_t int_diff = (size_t)diff;
+        size_t int_diff = wx_truncate_cast(size_t, diff);
         wxCHECK_MSG( (wxFileOffset)int_diff == diff, wxInvalidOffset, wxT("huge file not supported") );
         SetIntPosition(int_diff);
         return diff;
@@ -607,7 +606,7 @@ wxFileOffset wxStreamBuffer::Seek(wxFileOffset pos, wxSeekMode mode)
             }
             else
             {
-                size_t int_diff = (size_t)diff;
+                size_t int_diff = wx_truncate_cast(size_t, diff);
                 wxCHECK_MSG( (wxFileOffset)int_diff == diff, wxInvalidOffset, wxT("huge file not supported") );
                 SetIntPosition(int_diff);
                 return pos;
@@ -664,7 +663,13 @@ wxStreamBase::~wxStreamBase()
 size_t wxStreamBase::GetSize() const
 {
     wxFileOffset length = GetLength();
-    return length == wxInvalidOffset ? 0 : (size_t)length;
+    if ( length == wxInvalidOffset )
+        return 0;
+
+    const size_t len = wx_truncate_cast(size_t, length);
+    wxASSERT_MSG( len == length + size_t(0), _T("large files not supported") );
+
+    return len;
 }
 
 wxFileOffset wxStreamBase::OnSysSeek(wxFileOffset WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
@@ -677,20 +682,6 @@ wxFileOffset wxStreamBase::OnSysTell() const
     return wxInvalidOffset;
 }
 
-#if WXWIN_COMPATIBILITY_2_2
-
-wxStreamError wxStreamBase::LastError() const
-{
-    return m_lasterror;
-}
-
-size_t wxStreamBase::StreamSize() const
-{
-    return GetSize();
-}
-
-#endif // WXWIN_COMPATIBILITY_2_2
-
 // ----------------------------------------------------------------------------
 // wxInputStream
 // ----------------------------------------------------------------------------
@@ -998,7 +989,7 @@ size_t wxCountingOutputStream::OnSysWrite(const void *WXUNUSED(buffer),
 
 wxFileOffset wxCountingOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
 {
-    ssize_t new_pos = (ssize_t)pos;
+    ssize_t new_pos = wx_truncate_cast(ssize_t, pos);
 
     switch ( mode )
     {
@@ -1279,5 +1270,4 @@ wxOutputStream& wxEndL(wxOutputStream& stream)
     return stream.Write(eol, wxStrlen(eol));
 }
 
-#endif
-  // wxUSE_STREAMS
+#endif // wxUSE_STREAMS