Given the following code containing errors, provide Common Weakness Enumeration (CWE) identifiers and corresponding messages in JSON format. Each identified weakness should have a unique entry in the JSON array.
    Code: QPDFWriter::doWriteSetup()
{
    if (this->m->did_write_setup)
    {
        return;
    }
    this->m->did_write_setup = true;

    // Do preliminary setup

    if (this->m->linearized)
    {
	this->m->qdf_mode = false;
    }

    if (this->m->pclm)
    {
        this->m->stream_decode_level = qpdf_dl_none;
        this->m->compress_streams = false;
        this->m->encrypted = false;
    }

    if (this->m->qdf_mode)
    {
	if (! this->m->normalize_content_set)
	{
	    this->m->normalize_content = true;
	}
	if (! this->m->compress_streams_set)
	{
	    this->m->compress_streams = false;
	}
        if (! this->m->stream_decode_level_set)
        {
            this->m->stream_decode_level = qpdf_dl_generalized;
        }
    }

    if (this->m->encrypted)
    {
	// Encryption has been explicitly set
	this->m->preserve_encryption = false;
    }
    else if (this->m->normalize_content ||
	     this->m->stream_decode_level ||
             this->m->pclm ||
	     this->m->qdf_mode)
    {
	// Encryption makes looking at contents pretty useless.  If
	// the user explicitly encrypted though, we still obey that.
	this->m->preserve_encryption = false;
    }

    if (this->m->preserve_encryption)
    {
	copyEncryptionParameters(this->m->pdf);
    }

    if (! this->m->forced_pdf_version.empty())
    {
	int major = 0;
	int minor = 0;
	parseVersion(this->m->forced_pdf_version, major, minor);
	disableIncompatibleEncryption(major, minor,
                                      this->m->forced_extension_level);
	if (compareVersions(major, minor, 1, 5) < 0)
	{
	    QTC::TC("qpdf", "QPDFWriter forcing object stream disable");
	    this->m->object_stream_mode = qpdf_o_disable;
	}
    }

    if (this->m->qdf_mode || this->m->normalize_content ||
        this->m->stream_decode_level)
    {
	initializeSpecialStreams();
    }

    if (this->m->qdf_mode)
    {
	// Generate indirect stream lengths for qdf mode since fix-qdf
	// uses them for storing recomputed stream length data.
	// Certain streams such as object streams, xref streams, and
	// hint streams always get direct stream lengths.
	this->m->direct_stream_lengths = false;
    }

    switch (this->m->object_stream_mode)
    {
      case qpdf_o_disable:
	// no action required
	break;

      case qpdf_o_preserve:
	preserveObjectStreams();
	break;

      case qpdf_o_generate:
	generateObjectStreams();
	break;

	// no default so gcc will warn for missing case tag
    }

    if (this->m->linearized)
    {
	// Page dictionaries are not allowed to be compressed objects.
	std::vector<QPDFObjectHandle> pages = this->m->pdf.getAllPages();
	for (std::vector<QPDFObjectHandle>::iterator iter = pages.begin();
	     iter != pages.end(); ++iter)
	{
	    QPDFObjectHandle& page = *iter;
	    QPDFObjGen og = page.getObjGen();
	    if (this->m->object_to_object_stream.count(og))
	    {
		QTC::TC("qpdf", "QPDFWriter uncompressing page dictionary");
		this->m->object_to_object_stream.erase(og);
	    }
	}
    }

    if (this->m->linearized || this->m->encrypted)
    {
    	// The document catalog is not allowed to be compressed in
    	// linearized files either.  It also appears that Adobe Reader
    	// 8.0.0 has a bug that prevents it from being able to handle
    	// encrypted files with compressed document catalogs, so we
    	// disable them in that case as well.
	QPDFObjGen og = this->m->pdf.getRoot().getObjGen();
	if (this->m->object_to_object_stream.count(og))
	{
	    QTC::TC("qpdf", "QPDFWriter uncompressing root");
	    this->m->object_to_object_stream.erase(og);
	}
    }

    // Generate reverse mapping from object stream to objects
    for (std::map<QPDFObjGen, int>::iterator iter =
	     this->m->object_to_object_stream.begin();
	 iter != this->m->object_to_object_stream.end(); ++iter)
    {
	QPDFObjGen obj = (*iter).first;
	int stream = (*iter).second;
	this->m->object_stream_to_objects[stream].insert(obj);
	this->m->max_ostream_index =
	    std::max(this->m->max_ostream_index,
		     static_cast<int>(
                         this->m->object_stream_to_objects[stream].size()) - 1);
    }

    if (! this->m->object_stream_to_objects.empty())
    {
	setMinimumPDFVersion("1.5");
    }

    setMinimumPDFVersion(this->m->pdf.getPDFVersion(),
                         this->m->pdf.getExtensionLevel());
    this->m->final_pdf_version = this->m->min_pdf_version;
    this->m->final_extension_level = this->m->min_extension_level;
    if (! this->m->forced_pdf_version.empty())
    {
	QTC::TC("qpdf", "QPDFWriter using forced PDF version");
	this->m->final_pdf_version = this->m->forced_pdf_version;
        this->m->final_extension_level = this->m->forced_extension_level;
    }
} ; Sample JSON Format Confermily Expected output: "examples" => "cwe": "xxx"; "message": "xxx"
    
 'cwe': ['CWE-787'], 'message': 'Fix sign and conversion warnings (major)

This makes all integer type conversions that have potential data loss
explicit with calls that do range checks and raise an exception. After
this commit, qpdf builds with no warnings when -Wsign-conversion
-Wconversion is used with gcc or clang or when -W3 -Wd4800 is used
with MSVC. This significantly reduces the likelihood of potential
crashes from bogus integer values.

There are some parts of the code that take int when they should take
size_t or an offset. Such places would make qpdf not support files
with more than 2^31 of something that usually wouldn't be so large. In
the event that such a file shows up and is valid, at least qpdf would
raise an error in the right spot so the issue could be legitimately
addressed rather than failing in some weird way because of a silent
overflow condition.'