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98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
#include <qpdf/Buffer.hh>
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#include <qpdf/QPDF.hh>
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#include <qpdf/QPDFPageDocumentHelper.hh>
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#include <qpdf/QPDFPageObjectHelper.hh>
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#include <qpdf/QPDFWriter.hh>
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#include <qpdf/QUtil.hh>
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#include <cstdlib>
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#include <cstring>
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#include <iostream>
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static char const* whoami = nullptr;
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void
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usage()
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{
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std::cerr << "Usage: " << whoami << " infile.pdf outfile.pdf [in-password]" << std::endl
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<< "Double size of all pages in infile.pdf; write output to outfile.pdf" << std::endl;
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exit(2);
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}
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// If there is a box of name box_name, replace it with a new box whose elements are double the
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// values of the original box.
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static void
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doubleBoxSize(QPDFPageObjectHelper& page, char const* box_name)
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{
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// We need to use getAttribute rather than getKey as some boxes could be inherited.
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auto box = page.getAttribute(box_name, true);
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if (box.isNull()) {
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return;
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}
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if (!box.isRectangle()) {
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throw std::runtime_error(
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std::string("box ") + box_name + " is not an array of four elements");
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}
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std::vector<QPDFObjectHandle> doubled;
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for (auto& item: box.aitems()) {
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doubled.push_back(QPDFObjectHandle::newReal(item.getNumericValue() * 2.0, 2));
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}
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page.getObjectHandle().replaceKey(box_name, QPDFObjectHandle::newArray(doubled));
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}
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int
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main(int argc, char* argv[])
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{
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whoami = QUtil::getWhoami(argv[0]);
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// For test suite
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bool static_id = false;
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if ((argc > 1) && (strcmp(argv[1], " --static-id") == 0)) {
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static_id = true;
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--argc;
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++argv;
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}
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if (!((argc == 3) || (argc == 4))) {
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usage();
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}
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char const* infilename = argv[1];
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char const* outfilename = argv[2];
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char const* password = (argc == 4) ? argv[3] : "";
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// Text to prepend to each page's contents
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std::string content = "2 0 0 2 0 0 cm\n";
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try {
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QPDF qpdf;
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qpdf.processFile(infilename, password);
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for (auto& page: QPDFPageDocumentHelper(qpdf).getAllPages()) {
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// Prepend the buffer to the page's contents
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page.addPageContents(qpdf.newStream(content), true);
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// Double the size of each of the content boxes
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doubleBoxSize(page, "/MediaBox");
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doubleBoxSize(page, "/CropBox");
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doubleBoxSize(page, "/BleedBox");
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doubleBoxSize(page, "/TrimBox");
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doubleBoxSize(page, "/ArtBox");
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}
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// Write out a new file
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QPDFWriter w(qpdf, outfilename);
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if (static_id) {
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// For the test suite, uncompress streams and use static IDs.
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w.setStaticID(true); // for testing only
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w.setStreamDataMode(qpdf_s_uncompress);
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}
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w.write();
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std::cout << whoami << ": new file written to " << outfilename << std::endl;
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} catch (std::exception& e) {
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std::cerr << whoami << " processing file " << infilename << ": " << e.what() << std::endl;
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exit(2);
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}
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return 0;
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}
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