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: static void handle_page_specs(QPDF& pdf, Options& o)
{
    // Parse all page specifications and translate them into lists of
    // actual pages.

    // Handle "." as a shortcut for the input file
    for (std::vector<PageSpec>::iterator iter = o.page_specs.begin();
         iter != o.page_specs.end(); ++iter)
    {
        PageSpec& page_spec = *iter;
        if (page_spec.filename == ".")
        {
            page_spec.filename = o.infilename;
        }
    }

    if (! o.keep_files_open_set)
    {
        // Count the number of distinct files to determine whether we
        // should keep files open or not. Rather than trying to code
        // some portable heuristic based on OS limits, just hard-code
        // this at a given number and allow users to override.
        std::set<std::string> filenames;
        for (std::vector<PageSpec>::iterator iter = o.page_specs.begin();
             iter != o.page_specs.end(); ++iter)
        {
            PageSpec& page_spec = *iter;
            filenames.insert(page_spec.filename);
        }
        if (filenames.size() > o.keep_files_open_threshold)
        {
            QTC::TC("qpdf", "qpdf disable keep files open");
            if (o.verbose)
            {
                std::cout << whoami << ": selecting --keep-open-files=n"
                          << std::endl;
            }
            o.keep_files_open = false;
        }
        else
        {
            if (o.verbose)
            {
                std::cout << whoami << ": selecting --keep-open-files=y"
                          << std::endl;
            }
            o.keep_files_open = true;
            QTC::TC("qpdf", "qpdf don't disable keep files open");
        }
    }

    // Create a QPDF object for each file that we may take pages from.
    std::vector<PointerHolder<QPDF> > page_heap;
    std::map<std::string, QPDF*> page_spec_qpdfs;
    std::map<std::string, ClosedFileInputSource*> page_spec_cfis;
    page_spec_qpdfs[o.infilename] = &pdf;
    std::vector<QPDFPageData> parsed_specs;
    std::map<unsigned long long, std::set<QPDFObjGen> > copied_pages;
    for (std::vector<PageSpec>::iterator iter = o.page_specs.begin();
         iter != o.page_specs.end(); ++iter)
    {
        PageSpec& page_spec = *iter;
        if (page_spec_qpdfs.count(page_spec.filename) == 0)
        {
            // Open the PDF file and store the QPDF object. Throw a
            // PointerHolder to the qpdf into a heap so that it
            // survives through copying to the output but gets cleaned up
            // automatically at the end. Do not canonicalize the file
            // name. Using two different paths to refer to the same
            // file is a document workaround for duplicating a page.
            // If you are using this an example of how to do this with
            // the API, you can just create two different QPDF objects
            // to the same underlying file with the same path to
            // achieve the same affect.
            char const* password = page_spec.password;
            if (o.encryption_file && (password == 0) &&
                (page_spec.filename == o.encryption_file))
            {
                QTC::TC("qpdf", "qpdf pages encryption password");
                password = o.encryption_file_password;
            }
            if (o.verbose)
            {
                std::cout << whoami << ": processing "
                          << page_spec.filename << std::endl;
            }
            PointerHolder<InputSource> is;
            ClosedFileInputSource* cis = 0;
            if (! o.keep_files_open)
            {
                QTC::TC("qpdf", "qpdf keep files open n");
                cis = new ClosedFileInputSource(page_spec.filename.c_str());
                is = cis;
                cis->stayOpen(true);
            }
            else
            {
                QTC::TC("qpdf", "qpdf keep files open y");
                FileInputSource* fis = new FileInputSource();
                is = fis;
                fis->setFilename(page_spec.filename.c_str());
            }
            PointerHolder<QPDF> qpdf_ph = process_input_source(is, password, o);
            page_heap.push_back(qpdf_ph);
            page_spec_qpdfs[page_spec.filename] = qpdf_ph.getPointer();
            if (cis)
            {
                cis->stayOpen(false);
                page_spec_cfis[page_spec.filename] = cis;
            }
        }

        // Read original pages from the PDF, and parse the page range
        // associated with this occurrence of the file.
        parsed_specs.push_back(
            QPDFPageData(page_spec.filename,
                         page_spec_qpdfs[page_spec.filename],
                         page_spec.range));
    }

    if (! o.preserve_unreferenced_page_resources)
    {
        for (std::map<std::string, QPDF*>::iterator iter =
                 page_spec_qpdfs.begin();
             iter != page_spec_qpdfs.end(); ++iter)
        {
            std::string const& filename = (*iter).first;
            ClosedFileInputSource* cis = 0;
            if (page_spec_cfis.count(filename))
            {
                cis = page_spec_cfis[filename];
                cis->stayOpen(true);
            }
            QPDFPageDocumentHelper dh(*((*iter).second));
            dh.removeUnreferencedResources();
            if (cis)
            {
                cis->stayOpen(false);
            }
        }
    }

    // Clear all pages out of the primary QPDF's pages tree but leave
    // the objects in place in the file so they can be re-added
    // without changing their object numbers. This enables other
    // things in the original file, such as outlines, to continue to
    // work.
    if (o.verbose)
    {
        std::cout << whoami
                  << ": removing unreferenced pages from primary input"
                  << std::endl;
    }
    QPDFPageDocumentHelper dh(pdf);
    std::vector<QPDFPageObjectHelper> orig_pages = dh.getAllPages();
    for (std::vector<QPDFPageObjectHelper>::iterator iter =
             orig_pages.begin();
         iter != orig_pages.end(); ++iter)
    {
        dh.removePage(*iter);
    }

    if (o.collate && (parsed_specs.size() > 1))
    {
        // Collate the pages by selecting one page from each spec in
        // order. When a spec runs out of pages, stop selecting from
        // it.
        std::vector<QPDFPageData> new_parsed_specs;
        size_t nspecs = parsed_specs.size();
        size_t cur_page = 0;
        bool got_pages = true;
        while (got_pages)
        {
            got_pages = false;
            for (size_t i = 0; i < nspecs; ++i)
            {
                QPDFPageData& page_data = parsed_specs.at(i);
                if (cur_page < page_data.selected_pages.size())
                {
                    got_pages = true;
                    new_parsed_specs.push_back(
                        QPDFPageData(
                            page_data,
                            page_data.selected_pages.at(cur_page)));
                }
            }
            ++cur_page;
        }
        parsed_specs = new_parsed_specs;
    }

    // Add all the pages from all the files in the order specified.
    // Keep track of any pages from the original file that we are
    // selecting.
    std::set<int> selected_from_orig;
    std::vector<QPDFObjectHandle> new_labels;
    bool any_page_labels = false;
    int out_pageno = 0;
    for (std::vector<QPDFPageData>::iterator iter =
             parsed_specs.begin();
         iter != parsed_specs.end(); ++iter)
    {
        QPDFPageData& page_data = *iter;
        ClosedFileInputSource* cis = 0;
        if (page_spec_cfis.count(page_data.filename))
        {
            cis = page_spec_cfis[page_data.filename];
            cis->stayOpen(true);
        }
        QPDFPageLabelDocumentHelper pldh(*page_data.qpdf);
        if (pldh.hasPageLabels())
        {
            any_page_labels = true;
        }
        if (o.verbose)
        {
            std::cout << whoami << ": adding pages from "
                      << page_data.filename << std::endl;
        }
        for (std::vector<int>::iterator pageno_iter =
                 page_data.selected_pages.begin();
             pageno_iter != page_data.selected_pages.end();
             ++pageno_iter, ++out_pageno)
        {
            // Pages are specified from 1 but numbered from 0 in the
            // vector
            int pageno = *pageno_iter - 1;
            pldh.getLabelsForPageRange(pageno, pageno, out_pageno,
                                       new_labels);
            QPDFPageObjectHelper to_copy = page_data.orig_pages.at(pageno);
            QPDFObjGen to_copy_og = to_copy.getObjectHandle().getObjGen();
            unsigned long long from_uuid = page_data.qpdf->getUniqueId();
            if (copied_pages[from_uuid].count(to_copy_og))
            {
                QTC::TC("qpdf", "qpdf copy same page more than once",
                        (page_data.qpdf == &pdf) ? 0 : 1);
                to_copy = to_copy.shallowCopyPage();
            }
            else
            {
                copied_pages[from_uuid].insert(to_copy_og);
            }
            dh.addPage(to_copy, false);
            if (page_data.qpdf == &pdf)
            {
                // This is a page from the original file. Keep track
                // of the fact that we are using it.
                selected_from_orig.insert(pageno);
            }
        }
        if (cis)
        {
            cis->stayOpen(false);
        }
    }
    if (any_page_labels)
    {
        QPDFObjectHandle page_labels =
            QPDFObjectHandle::newDictionary();
        page_labels.replaceKey(
            "/Nums", QPDFObjectHandle::newArray(new_labels));
        pdf.getRoot().replaceKey("/PageLabels", page_labels);
    }

    // Delete page objects for unused page in primary. This prevents
    // those objects from being preserved by being referred to from
    // other places, such as the outlines dictionary.
    for (size_t pageno = 0; pageno < orig_pages.size(); ++pageno)
    {
        if (selected_from_orig.count(pageno) == 0)
        {
            pdf.replaceObject(
                orig_pages.at(pageno).getObjectHandle().getObjGen(),
                QPDFObjectHandle::newNull());
        }
    }
} ; 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.'