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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
#ifndef INCLUDED_HWPFILTER_SOURCE_HGZIP_H
#define INCLUDED_HWPFILTER_SOURCE_HGZIP_H
#include <zlib.h>
class HStream;
/**
* @short Structure for using z_stream
*/
struct gz_stream
{
z_stream stream;
/**
* The error code of z_stream operation
*/
int z_err;
/**
* EOF of the input file
*/
int z_eof;
/**
* Stream
*/
HStream* _inputstream;
/**
* Input buffer
*/
Byte *inbuf;
/**
* Crc32 of uncompressed data
*/
uLong crc;
/**
* Stream
*/
char *msg;
/**
* 'w' or 'r'
*/
char mode;
};
/**
* Opens a gzipped stream for reading.
* gz_open returns NULL if the stream could not be opened or if there was
* insufficient memory to allocate the (de)compression state; errno
* can be checked to distinguish the two cases (if errno is zero, the
* zlib error is Z_MEM_ERROR).
* @param _stream Reference of stream object having binary data.
*/
gz_stream *gz_open ( HStream& _stream );
/**
* Flushes all pending output if necessary, closes the compressed stream
* and deallocates all the (de)compression state
*/
int gz_close ( gz_stream *file );
/**
* Reads the given number of uncompressed bytes from the compressed stream
* @param file Gzipped stream
* @param buf Buffer to have the data to be read
* @param len Length of data to be read
* @returns The number of bytes actually read
*/
size_t gz_read ( gz_stream *file, voidp buf, unsigned len );
/**
* Flushes all pending output into the compressed file
* gz_flush should be called only when strictly necessary because it can
* degrade compression
* @param flush Is as in the deflate() function
*/
int gz_flush ( gz_stream *file, int flush );
#endif // INCLUDED_HWPFILTER_SOURCE_HGZIP_H
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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