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Posted to dev@xalan.apache.org by "Bob Bisso (JIRA)" <xa...@xml.apache.org> on 2004/11/01 18:04:34 UTC
[jira] Updated: (XALANC-438) Memory corruption when the encoding of the output of the transform is set to UTF-16
[ http://nagoya.apache.org/jira/browse/XALANC-438?page=history ]
Bob Bisso updated XALANC-438:
-----------------------------
Attachment: foo.xsl
To reproduce this issue replace the foo.xsl file in the Samples\SimpleTransform directory with this one and execute the SimpleTransform.exe.
> Memory corruption when the encoding of the output of the transform is set to UTF-16
> -----------------------------------------------------------------------------------
>
> Key: XALANC-438
> URL: http://nagoya.apache.org/jira/browse/XALANC-438
> Project: XalanC
> Type: Bug
> Components: XalanC
> Versions: 1.6, 1.8
> Environment: Windows
> Reporter: Bob Bisso
> Attachments: foo.xsl
>
> Memory corruption occurs when a large buffer, greater than 512 bytes
> Memory corruption occurs when the encoding of the output of a transform is set to UTF-16 (either programmatically or by inserting "<xsl:output encoding='UTF-16' />" in the style sheet). The function FormatterToXML_UTF16::write() in the file FormatterToXML_UTF16.cpp (in "src\xalanc\XMLSupport" folder) is used in serializing the transformed output in UTF-16 encoding. It uses a buffer of 512 characters long to store the output before writing it to the output device. At the top of the function, it attempts to check if the length of the data (in double byte characters) it is asked to write to the output device is bigger than the size of the buffer (in bytes). So the code to handle this is not executed due to this problem, and the code merrily goes along to write the data into the buffer, hence corrupting memory. There is a second problem, and that is in the code that actually handles the case where the length of the data exceeded the buffer size, it flushes the buffer, and then use the wrong overloaded write() function to write the data to the output device.
> Proposed fix, for FormatterToXML_UTF16::write() in the file FormatterToXML_UTF16.cpp, is as follows:
> inline void
> FormatterToXML_UTF16::write(
> const XalanDOMChar* theChars,
> XalanDOMString::size_type theLength)
> {
> if (theLength > sizeof(m_buffer)/sizeof(XalanDOMChar))
> {
> flushBuffer();
> m_writer->write((const char*)theChars, 0, theLength * sizeof(XalanDOMChar));
> }
> else
> {
> if (m_bufferRemaining < theLength)
> {
> flushBuffer();
> }
> for(XalanDOMString::size_type i = 0; i < theLength; ++i)
> {
> *m_bufferPosition = theChars[i];
> ++m_bufferPosition;
> }
> m_bufferRemaining -= theLength;
> }
> }
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