mirror of https://github.com/qpdf/qpdf.git
88 lines
2.0 KiB
C++
88 lines
2.0 KiB
C++
#include <qpdf/Pl_DCT.hh>
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#include <qpdf/Pl_StdioFile.hh>
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#include <qpdf/QUtil.hh>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <iostream>
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static void
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usage()
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{
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std::cerr << "Usage: dct_compress infile outfile width height {rgb|cmyk|gray}" << std::endl;
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exit(2);
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}
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class Callback: public Pl_DCT::CompressConfig
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{
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public:
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Callback() = default;
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~Callback() override = default;
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void apply(jpeg_compress_struct*) override;
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bool called{false};
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};
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void
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Callback::apply(jpeg_compress_struct*)
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{
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this->called = true;
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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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if (argc != 6) {
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usage();
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}
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char* infilename = argv[1];
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char* outfilename = argv[2];
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JDIMENSION width = QUtil::string_to_uint(argv[3]);
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JDIMENSION height = QUtil::string_to_uint(argv[4]);
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char* colorspace = argv[5];
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J_COLOR_SPACE cs =
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((strcmp(colorspace, "rgb") == 0) ? JCS_RGB
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: (strcmp(colorspace, "cmyk") == 0) ? JCS_CMYK
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: (strcmp(colorspace, "gray") == 0) ? JCS_GRAYSCALE
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: JCS_UNKNOWN);
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int components = 0;
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switch (cs) {
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case JCS_RGB:
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components = 3;
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break;
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case JCS_CMYK:
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components = 4;
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break;
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case JCS_GRAYSCALE:
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components = 1;
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break;
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default:
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usage();
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break;
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}
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FILE* infile = QUtil::safe_fopen(infilename, "rb");
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FILE* outfile = QUtil::safe_fopen(outfilename, "wb");
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Pl_StdioFile out("stdout", outfile);
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unsigned char buf[100];
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bool done = false;
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Callback callback;
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Pl_DCT dct("dct", &out, width, height, components, cs, &callback);
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while (!done) {
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size_t len = fread(buf, 1, sizeof(buf), infile);
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if (len <= 0) {
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done = true;
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} else {
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dct.write(buf, len);
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}
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}
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dct.finish();
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if (!callback.called) {
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std::cout << "Callback was not called" << std::endl;
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}
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fclose(infile);
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fclose(outfile);
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return 0;
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}
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