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73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program 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
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#ifndef COMMON_ZLIB_H
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#define COMMON_ZLIB_H
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#include "common/scummsys.h"
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#include "common/stream.h"
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namespace Common {
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#if defined(USE_ZLIB)
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/**
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* Thin wrapper around zlib's uncompress() function. This wrapper makes
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* it possible to uncompress data in engines without being forced to link
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* them against zlib, thus simplifying the build system.
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*
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* @return true on success (i.e. Z_OK), false otherwise
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*/
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bool uncompress(byte *dst, unsigned long *dstLen, const byte *src, unsigned long srcLen);
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#endif
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/**
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* Take an arbitrary SeekableReadStream and wrap it in a custom stream which
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* provides transparent on-the-fly decompression. Assumes the data it
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* retrieves from the wrapped stream to be either uncompressed or in gzip
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* format. In the former case, the original stream is returned unmodified
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* (and in particular, not wrapped).
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*
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* It is safe to call this with a NULL parameter (in this case, NULL is
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* returned).
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*/
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Common::SeekableReadStream *wrapCompressedReadStream(Common::SeekableReadStream *toBeWrapped);
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/**
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* Take an arbitrary WriteStream and wrap it in a custom stream which provides
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* transparent on-the-fly compression. The compressed data is written in the
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* gzip format, unless ZLIB support has been disabled, in which case the given
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* stream is returned unmodified (and in particular, not wrapped).
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*
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* It is safe to call this with a NULL parameter (in this case, NULL is
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* returned).
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*/
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Common::WriteStream *wrapCompressedWriteStream(Common::WriteStream *toBeWrapped);
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} // End of namespace Common
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#endif
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