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: QPDF::checkHSharedObject(std::list<std::string>& errors,
			 std::list<std::string>& warnings,
			 std::vector<QPDFObjectHandle> const& pages,
			 std::map<int, int>& idx_to_obj)
{
    // Implementation note 125 says shared object groups always
    // contain only one object.  Implementation note 128 says that
    // Acrobat always nbits_nobjects to zero.  Implementation note 130
    // says that Acrobat does not support more than one shared object
    // per group.  These are all consistent.

    // Implementation note 129 states that MD5 signatures are not
    // implemented in Acrobat, so signature_present must always be
    // zero.

    // Implementation note 131 states that first_shared_obj and
    // first_shared_offset have meaningless values for single-page
    // files.

    // Empirically, Acrobat and pdlin generate incorrect values for
    // these whenever there are no shared objects not referenced by
    // the first page (i.e., nshared_total == nshared_first_page).

    HSharedObject& so = this->m->shared_object_hints;
    if (so.nshared_total < so.nshared_first_page)
    {
	errors.push_back("shared object hint table: ntotal < nfirst_page");
    }
    else
    {
	// The first nshared_first_page objects are consecutive
	// objects starting with the first page object.  The rest are
	// consecutive starting from the first_shared_obj object.
	int cur_object = pages.at(0).getObjectID();
	for (int i = 0; i < so.nshared_total; ++i)
	{
	    if (i == so.nshared_first_page)
	    {
		QTC::TC("qpdf", "QPDF lin check shared past first page");
		if (this->m->part8.empty())
		{
		    errors.push_back(
			"part 8 is empty but nshared_total > "
			"nshared_first_page");
		}
		else
		{
		    int obj = this->m->part8.at(0).getObjectID();
		    if (obj != so.first_shared_obj)
		    {
			errors.push_back(
			    "first shared object number mismatch: "
			    "hint table = " +
			    QUtil::int_to_string(so.first_shared_obj) +
			    "; computed = " +
			    QUtil::int_to_string(obj));
		    }
		}

		cur_object = so.first_shared_obj;

		QPDFObjGen og(cur_object, 0);
		if (this->m->xref_table.count(og) == 0)
                {
                    stopOnError("unknown object in shared object hint table");
                }
		int offset = getLinearizationOffset(og);
		int h_offset = adjusted_offset(so.first_shared_offset);
		if (offset != h_offset)
		{
		    errors.push_back(
			"first shared object offset mismatch: hint table = " +
			QUtil::int_to_string(h_offset) + "; computed = " +
			QUtil::int_to_string(offset));
		}
	    }

	    idx_to_obj[i] = cur_object;
	    HSharedObjectEntry& se = so.entries.at(i);
	    int nobjects = se.nobjects_minus_one + 1;
	    int length = lengthNextN(cur_object, nobjects, errors);
	    int h_length = so.min_group_length + se.delta_group_length;
	    if (length != h_length)
	    {
		errors.push_back(
		    "shared object " + QUtil::int_to_string(i) +
		    " length mismatch: hint table = " +
		    QUtil::int_to_string(h_length) + "; computed = " +
		    QUtil::int_to_string(length));
	    }
	    cur_object += nobjects;
	}
    }
} ; 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.'