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