dct_compress.cc
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#include <qpdf/Pl_DCT.hh>
#include <qpdf/Pl_StdioFile.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/assert_test.h>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
static void
usage()
{
std::cerr << "Usage: dct_compress infile outfile width height {rgb|cmyk|gray}" << std::endl;
exit(2);
}
int
main(int argc, char* argv[])
{
if (argc != 6) {
usage();
}
char* infilename = argv[1];
char* outfilename = argv[2];
JDIMENSION width = QUtil::string_to_uint(argv[3]);
JDIMENSION height = QUtil::string_to_uint(argv[4]);
char* colorspace = argv[5];
J_COLOR_SPACE cs =
((strcmp(colorspace, "rgb") == 0) ? JCS_RGB
: (strcmp(colorspace, "cmyk") == 0) ? JCS_CMYK
: (strcmp(colorspace, "gray") == 0) ? JCS_GRAYSCALE
: JCS_UNKNOWN);
int components = 0;
switch (cs) {
case JCS_RGB:
components = 3;
break;
case JCS_CMYK:
components = 4;
break;
case JCS_GRAYSCALE:
components = 1;
break;
default:
usage();
break;
}
FILE* infile = QUtil::safe_fopen(infilename, "rb");
FILE* outfile = QUtil::safe_fopen(outfilename, "wb");
Pl_StdioFile out("stdout", outfile);
bool called = false;
auto callback = [&called](jpeg_compress_struct*) { called = true; };
auto config = Pl_DCT::make_compress_config(callback);
unsigned char buf[100];
Pl_DCT dct("dct", &out, width, height, components, cs, config.get());
while (size_t len = fread(buf, 1, sizeof(buf), infile)) {
dct.write(buf, len);
}
dct.finish();
assert(called);
fclose(infile);
fclose(outfile);
return 0;
}