fix recently introduced memory leak of m_conv (bug 1466559)

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

diff --git a/src/common/textfile.cpp b/src/common/textfile.cpp
index c48a48d2aba1642f6b8bbe31048af2afb2e8fd62..3334375b44ccc6027877a82873e99fab621035e6 100644 (file)
--- a/src/common/textfile.cpp
+++ b/src/common/textfile.cpp
@@ -86,7 +86,7 @@ bool wxTextFile::OnClose()
 }
 
 
-bool wxTextFile::OnRead(wxMBConv& conv)
+bool wxTextFile::OnRead(const wxMBConv& conv)
 {
     // file should be opened and we must be in it's beginning
     wxASSERT( m_file.IsOpened() && m_file.Tell() == 0 );
@@ -98,7 +98,7 @@ bool wxTextFile::OnRead(wxMBConv& conv)
     // read and so the conversion would fail) and, as the file contents is kept
     // in memory by wxTextFile anyhow, it shouldn't be a big problem to read
     // the file entirely
-    const size_t bufSize = m_file.Length() + 4 /* for trailing NULs */;
+    const size_t bufSize = (size_t)(m_file.Length() + 4 /* for trailing NULs */ );
     size_t bufPos = 0;
     wxCharBuffer buf(bufSize - 1 /* it adds 1 internally */);
 
@@ -114,18 +114,8 @@ bool wxTextFile::OnRead(wxMBConv& conv)
             return false;
         }
 
-        eof = nRead == 0;
-        if ( eof )
-        {
-            // append 4 trailing NUL bytes: this is needed to ensure that the
-            // string is going to be NUL-terminated, whatever is the encoding
-            // used (even UTF-32)
-            block[0] =
-            block[1] =
-            block[2] =
-            block[3] = '\0';
-            nRead = 4;
-        }
+        if ( nRead == 0 )
+            break;
 
         // this shouldn't happen but don't overwrite the buffer if it does
         wxCHECK_MSG( bufPos + nRead <= bufSize, false,
@@ -136,9 +126,11 @@ bool wxTextFile::OnRead(wxMBConv& conv)
         bufPos += nRead;
     }
 
-    const wxString str(buf, conv);
+    const wxString str(buf, conv, bufPos);
+
+    // this doesn't risk to happen in ANSI build
 #if wxUSE_UNICODE
-    if ( str.empty() )
+    if ( bufSize > 4 && str.empty() )
     {
         wxLogError(_("Failed to convert file contents to Unicode."));
         return false;
@@ -209,7 +201,7 @@ bool wxTextFile::OnRead(wxMBConv& conv)
 }
 
 
-bool wxTextFile::OnWrite(wxTextFileType typeNew, wxMBConv& conv)
+bool wxTextFile::OnWrite(wxTextFileType typeNew, const wxMBConv& conv)
 {
     wxFileName fn = m_strBufferName;
 
@@ -239,4 +231,3 @@ bool wxTextFile::OnWrite(wxTextFileType typeNew, wxMBConv& conv)
 }
 
 #endif // wxUSE_TEXTFILE
-