third_party/protobuf/3.6.1/src/google/protobuf/testing/zcgzip.cc

// Protocol Buffers - Google's data interchange format
// Copyright 2009 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
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// Author: brianolson@google.com (Brian Olson)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.
//
// Test program to verify that GzipOutputStream is compatible with command line
// gzip or java.util.zip.GzipOutputStream
//
// Reads data on standard input and writes compressed gzip stream to standard
// output.

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

#ifdef _WIN32
#ifndef STDIN_FILENO
#define STDIN_FILENO 0
#endif
#ifndef STDOUT_FILENO
#define STDOUT_FILENO 1
#endif
#endif

#include <google/protobuf/io/gzip_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>

using google::protobuf::io::FileOutputStream;
using google::protobuf::io::GzipOutputStream;

int main(int argc, const char** argv) {
  FileOutputStream fout(STDOUT_FILENO);
  GzipOutputStream out(&fout);
  int readlen;

  while (true) {
    void* outptr;
    int outlen;
    bool ok;
    do {
      ok = out.Next(&outptr, &outlen);
      if (!ok) {
        break;
      }
    } while (outlen <= 0);
    readlen = read(STDIN_FILENO, outptr, outlen);
    if (readlen <= 0) {
      out.BackUp(outlen);
      break;
    }
    if (readlen < outlen) {
      out.BackUp(outlen - readlen);
    }
  }

  return 0;
}