mirror of
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114 lines
2.6 KiB
C++
114 lines
2.6 KiB
C++
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#include <qpdf/Pl_Flate.hh>
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#include <qpdf/Pl_StdioFile.hh>
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#include <qpdf/Pl_Count.hh>
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#include <iostream>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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FILE* safe_fopen(char const* filename, char const* mode)
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{
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FILE* result = fopen(filename, mode);
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if (result == 0)
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{
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std::cerr << "fopen " << filename << " failed: " << strerror(errno)
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<< std::endl;
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exit(2);
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}
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return result;
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}
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void run(char const* filename)
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{
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std::string n1 = std::string(filename) + ".1";
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std::string n2 = std::string(filename) + ".2";
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std::string n3 = std::string(filename) + ".3";
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FILE* o1 = safe_fopen(n1.c_str(), "wb");
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FILE* o2 = safe_fopen(n2.c_str(), "wb");
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FILE* o3 = safe_fopen(n3.c_str(), "wb");
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Pipeline* out1 = new Pl_StdioFile("o1", o1);
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Pipeline* out2 = new Pl_StdioFile("o2", o2);
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Pipeline* out3 = new Pl_StdioFile("o3", o3);
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// Compress the file
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Pipeline* def1 = new Pl_Flate("def1", out1, Pl_Flate::a_deflate);
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// Decompress the file
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Pipeline* inf2 = new Pl_Flate("inf2", out2, Pl_Flate::a_inflate);
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// Count bytes written to o3
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Pl_Count* count3 = new Pl_Count("count3", out3);
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// Do both simultaneously
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Pipeline* inf3 = new Pl_Flate("inf3", count3, Pl_Flate::a_inflate);
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Pipeline* def3 = new Pl_Flate("def3", inf3, Pl_Flate::a_deflate);
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FILE* in1 = safe_fopen(filename, "rb");
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unsigned char buf[1024];
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size_t len;
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while ((len = fread(buf, 1, sizeof(buf), in1)) > 0)
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{
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// Write to the compression pipeline
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def1->write(buf, len);
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// Write to the both pipeline
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def3->write(buf, len);
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}
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def1->finish();
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delete def1;
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delete out1;
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fclose(o1);
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def3->finish();
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std::cout << "bytes written to o3: " << count3->getCount() << std::endl;
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delete def3;
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delete inf3;
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delete count3;
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delete out3;
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fclose(o3);
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// Now read the compressed data and write to the output uncompress pipeline
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FILE* in2 = safe_fopen(n1.c_str(), "rb");
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while ((len = fread(buf, 1, sizeof(buf), in2)) > 0)
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{
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inf2->write(buf, len);
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}
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inf2->finish();
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delete inf2;
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delete out2;
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fclose(o2);
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// At this point, filename, filename.2, and filename.3 should have
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// identical contents. filename.1 should be a compressed version.
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std::cout << "done" << std::endl;
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}
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int main(int argc, char* argv[])
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{
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if (argc != 2)
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{
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std::cerr << "Usage: pipeline filename" << std::endl;
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exit(2);
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}
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char* filename = argv[1];
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try
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{
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run(filename);
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}
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catch (std::exception& e)
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{
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std::cout << e.what() << std::endl;
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}
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return 0;
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}
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