root/trunk/whisperlib/common/io/zlib/zlib-gzip.cc

// Copyright (c) 2009, Whispersoft s.r.l.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
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// this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// Authors: Catalin Popescu

// Showcase for compressing / decompressing a file

#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>

#include "common/base/types.h"
#include "common/base/log.h"
#include "common/base/system.h"
#include "common/base/gflags.h"
#include "common/base/errno.h"

#include "common/io/zlib/zlibwrapper.h"
#include "common/io/file/file_input_stream.h"

//////////////////////////////////////////////////////////////////////

DEFINE_string(infile,
              "",
              "The input file");
DEFINE_string(outfile,
              "",
              "The outputput file");
DEFINE_bool(compress,
            true,
            "True -> compress / else decompress");

//////////////////////////////////////////////////////////////////////

int main(int argc, char* argv[]) {
  common::Init(argc, argv);
  CHECK(!FLAGS_infile.empty())  << " Please specify an input file !";
  CHECK(!FLAGS_outfile.empty()) << " Please specify an output file !";

  io::MemoryStream ms;
  ms.Write(io::FileInputStream::ReadFileOrDie(FLAGS_infile.c_str()));
  io::MemoryStream out;
  if ( FLAGS_compress ) {
    io::ZlibGzipEncodeWrapper zw;
    zw.Encode(&ms, &out);
  } else {
    io::ZlibGzipDecodeWrapper zw;
    int err = zw.Decode(&ms, &out);
    CHECK_EQ(err, Z_STREAM_END) << " ZLIB error: " << err;
  }
  if ( !out.IsEmpty() ) {
    io::File* fout = io::File::CreateFileOrDie(FLAGS_outfile.c_str());
    const string s(out.ToString());
    fout->Write(s.data(), s.size());
    delete fout;
  }
}