freearc/clibs/Compression/_Examples/Example-C.cpp

/*
 *  Example program of using FreeArc Unified Compression Library with C/C++
 *
 *  This program implements simplest compressor/decompressor
 *  Run program without parameters to see it's syntax
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../Compression.h"

// Callback for compression/decompression functions
static int callback(const char *what, void *buf, int size, void *) {
  if (strequ(what, "read"))
    return fread(buf, 1, size, stdin);
  else if (strequ(what, "write"))
    return fwrite(buf, 1, size, stdout) == size ? size : FREEARC_ERRCODE_WRITE;
  else
    return FREEARC_ERRCODE_NOT_IMPLEMENTED;
}

int main(int argc, char *argv[]) {
  SetCompressionThreads(8);
  if (argc == 2) {
    set_binary_mode(stdin);
    set_binary_mode(stdout);
    int result = strcasecmp(argv[1], "d")
                     ? CompressWithHeader(argv[1], callback, NULL)
                     : DecompressWithHeader(callback, NULL);
    if (result) {
      fprintf(stderr, "(De)compression error %d!\n", result);
      return EXIT_FAILURE;
    }
    return EXIT_SUCCESS;
  } else {
    printf("Compressor v2.2 (2012-01-15) - demonstration of FreeArc Unified "
           "Compression Library\n"
           "\n"
           "Usage, compression: Compressor method <infile >outfile\n"
           "       decompression: Compressor d <infile >outfile\n"
           "\n"
           "Note: all FreeArc compression methods are supported, for example "
           "rep:512m+4x4:lzma:ht4:8m\n");
    return argc == 1 ? EXIT_SUCCESS : EXIT_FAILURE;
  }
}