vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/* Copyright (C) 2011 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. 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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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include "Compress.h"
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#include "lib/byte_order.h"
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#include "lib/external_libraries/zlib.h"
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void CompressZLib(const std::string& data, std::string& out, bool includeLengthHeader)
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{
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uLongf maxCompressedSize = compressBound(data.size());
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uLongf destLen = maxCompressedSize;
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out.clear();
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if (includeLengthHeader)
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{
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// Add a 4-byte uncompressed length header to the output
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out.resize(maxCompressedSize + 4);
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write_le32((void*)out.c_str(), data.size());
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int zok = compress((Bytef*)out.c_str() + 4, &destLen, (const Bytef*)data.c_str(), data.size());
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ENSURE(zok == Z_OK);
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out.resize(destLen + 4);
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}
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else
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{
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out.resize(maxCompressedSize);
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int zok = compress((Bytef*)out.c_str(), &destLen, (const Bytef*)data.c_str(), data.size());
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ENSURE(zok == Z_OK);
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out.resize(destLen);
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}
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}
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void DecompressZLib(const std::string& data, std::string& out, bool includeLengthHeader)
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{
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ENSURE(includeLengthHeader); // otherwise we don't know how much to allocate
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out.clear();
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out.resize(read_le32(data.c_str()));
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uLongf destLen = out.size();
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int zok = uncompress((Bytef*)out.c_str(), &destLen, (const Bytef*)data.c_str() + 4, data.size() - 4);
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ENSURE(zok == Z_OK);
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ENSURE(destLen == out.size());
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// TODO: better error reporting might be nice
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}
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