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ac4deac187
fopen was previuosly called wrapped by QUtil::fopen_wrapper, but QUtil::safe_fopen does this itself, which is less cumbersome.
76 lines
1.5 KiB
C++
76 lines
1.5 KiB
C++
#include <qpdf/Pl_PNGFilter.hh>
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#include <qpdf/Pl_StdioFile.hh>
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#include <qpdf/QUtil.hh>
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#include <iostream>
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#include <errno.h>
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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void run(char const* filename, bool encode, unsigned int columns)
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{
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// Decode the file
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FILE* in = QUtil::safe_fopen(filename, "rb");
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FILE* o1 = QUtil::safe_fopen("out", "wb");
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Pipeline* out = new Pl_StdioFile("out", o1);
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Pipeline* pl = new Pl_PNGFilter(
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"png", out,
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encode ? Pl_PNGFilter::a_encode : Pl_PNGFilter::a_decode,
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columns, 0 /* not used */);
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assert((2 * (columns + 1)) < 1024);
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unsigned char buf[1024];
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size_t len;
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while (true)
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{
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len = fread(buf, 1, (2 * columns) + 1, in);
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if (len == 0)
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{
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break;
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}
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pl->write(buf, len);
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len = fread(buf, 1, 1, in);
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if (len == 0)
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{
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break;
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}
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pl->write(buf, len);
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len = fread(buf, 1, 1, in);
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if (len == 0)
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{
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break;
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}
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pl->write(buf, len);
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}
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pl->finish();
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delete pl;
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delete out;
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fclose(o1);
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fclose(in);
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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 != 4)
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{
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std::cerr << "Usage: pipeline {en,de}code filename columns" << std::endl;
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exit(2);
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}
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bool encode = (strcmp(argv[1], "encode") == 0);
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char* filename = argv[2];
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int columns = atoi(argv[3]);
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try
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{
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run(filename, encode, columns);
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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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