136 lines
3.7 KiB
C++
136 lines
3.7 KiB
C++
/*************************************************************************
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* $RCSfile: hgzip.h,v $
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*
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* $Revision: 1.3 $
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*
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* last change: $Author: rt $ $Date: 2005-09-07 16:34:43 $
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*
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* The Contents of this file are made available subject to
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* the terms of GNU Lesser General Public License Version 2.1.
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*
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*
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* GNU Lesser General Public License Version 2.1
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* =============================================
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* Copyright 2005 by Sun Microsystems, Inc.
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* 901 San Antonio Road, Palo Alto, CA 94303, USA
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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************************************************************************/
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/* $Id: hgzip.h,v 1.3 2005-09-07 16:34:43 rt Exp $ */
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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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* Writes the given number of uncompressed bytes into the compressed file
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* This exists for future using.
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* @returns The number of bytes actually written
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*/
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int gz_write ( gz_stream *file, const 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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/**
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* Not implemented.
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*/
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int gz_seek ( gz_stream *file, long offset, int whence );
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/**
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* Not implemented.
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*/
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long gz_tell ( gz_stream *file );
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#endif /* _HWPGZIP_H_ */
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