qpdf/libtests/lzw.cc

#include <qpdf/Pl_LZWDecoder.hh>

#include <qpdf/Pl_StdioFile.hh>
#include <qpdf/QUtil.hh>
#include <cstdlib>
#include <cstring>
#include <iostream>

int
main(int argc, char* argv[])
{
    bool early_code_change = true;
    if ((argc == 4) && (strcmp(argv[3], "--no-early-code-change") == 0)) {
        early_code_change = false;
    }

    if (argc < 3) {
        std::cerr << "Usage: lzw infile outfile [ --no-early-code-change ]" << std::endl;
        exit(2);
    }

    try {
        char* infilename = argv[1];
        char* outfilename = argv[2];

        FILE* infile = QUtil::safe_fopen(infilename, "rb");
        FILE* outfile = QUtil::safe_fopen(outfilename, "wb");

        Pl_StdioFile out("output", outfile);
        Pl_LZWDecoder decode("decode", &out, early_code_change);

        unsigned char buf[10000];
        bool done = false;
        while (!done) {
            size_t len = fread(buf, 1, sizeof(buf), infile);
            if (len <= 0) {
                done = true;
            } else {
                decode.write(buf, len);
            }
        }
        decode.finish();
    } catch (std::exception& e) {
        std::cerr << e.what() << std::endl;
        exit(2);
    }

    return 0;
}