Fix posting of binary data using wxHTTP.

Don't use mbc_str() which can fail to convert contents of the string created
using wxString::From8BitData(). Use To8BitData() instead.

This fixes posting of binary data via HTTP using binary content transfer
encoding.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64728 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -452,6 +452,7 @@ All:
 - Added wxMessageQueue::Clear().
 - Added wxConfig::Read(float *) overload (Terry Farnham).
 - Always use decimal point (and not the current locale separator) in wxConfig.
+- Fix posting of binary data using wxHTTP (Catalin Raceanu).
 
 Unix:
 

src/common/http.cpp

@@ -346,7 +346,17 @@ bool wxHTTP::BuildRequest(const wxString& path, wxHTTP_Req req)
     Write("\r\n", 2);
 
     if ( req == wxHTTP_POST ) {
-        Write(m_post_buf.mbc_str(), m_post_buf.Len());
+        // Post data can be arbitrary binary data when the "binary" content
+        // transfer encoding is used so don't assume it's ASCII only or
+        // NUL-terminated.
+        {
+            const wxScopedCharBuffer buf(m_post_buf.To8BitData());
+            Write(buf, buf.length());
+        } // delete the buffer before modifying the string it points to, it
+          // wouldn't really be a problem here even if we didn't do this
+          // because we won't use this buffer again but this will avoid any
+          // nasty surprises in the future if this code changes
+
         m_post_buf = wxEmptyString;
     }