84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
/*
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Moonfall Copyright (C) 2008 Alex Yatskov
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This program 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 3 of the License, or
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(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, see <http://www.gnu.org/licenses/>.
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*/
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#include "Pch.h"
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#include "Compression.h"
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#include <zlib.h>
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namespace Zlib
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{
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bool Compress(const Buffer& bufferUncomp, Buffer* bufferComp)
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{
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while (true)
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{
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uLongf size = bufferComp->GetSize();
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const int result = compress(
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static_cast<Bytef*>(bufferComp->Get()),
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&size,
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static_cast<const Bytef*>(bufferUncomp.Get()),
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bufferUncomp.GetSize()
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);
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if (result == Z_OK)
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{
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// trim buffer to data size
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bufferComp->RemoveFromBack(NULL, bufferComp->GetSize() - size);
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return true;
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}
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if (result == Z_BUF_ERROR)
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{
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bufferComp->Allocate(size * 2);
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}
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else
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{
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return false;
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}
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}
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}
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bool Decompress(const Buffer& bufferComp, Buffer* bufferUncomp)
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{
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while (true)
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{
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uLongf size = bufferUncomp->GetSize();
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const int result = uncompress(
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static_cast<Bytef*>(bufferUncomp->Get()),
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&size,
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static_cast<const Bytef*>(bufferComp.Get()),
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bufferComp.GetSize()
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);
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if (result == Z_OK)
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{
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// trim buffer to data size
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bufferUncomp->RemoveFromBack(NULL, bufferUncomp->GetSize() - size);
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return true;
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}
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if (result == Z_BUF_ERROR)
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{
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bufferUncomp->Allocate(size * 2);
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}
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else
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{
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return false;
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}
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}
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}
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}
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