gzip_compress.h

/** @file

  Gzip/Deflate compression implementation

  @section license License

  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
 */

#pragma once

#include "compress_common.h"
#include <zlib.h>

// zlib stuff, see [deflateInit2] at http://www.zlib.net/manual.html
static const int ZLIB_MEMLEVEL       = 9; // min=1 (optimize for memory),max=9 (optimized for speed)
static const int WINDOW_BITS_DEFLATE = -15;
static const int WINDOW_BITS_GZIP    = 31;

namespace Gzip
{
// Initialize gzip/deflate compression context
void data_alloc(Data *data);

// Destroy gzip/deflate compression context
void data_destroy(Data *data);

// Configure the context with compression level. Returns true when ready.
bool transform_init(Data *data);

// Compress one chunk of data
void transform_one(Data *data, const char *upstream_buffer, int64_t upstream_length);

// Finish compression and flush remaining data
void transform_finish(Data *data);

voidpf gzip_alloc(voidpf opaque, uInt items, uInt size);
void   gzip_free(voidpf opaque, voidpf address);

} // namespace Gzip