151 lines
4.1 KiB
C++
151 lines
4.1 KiB
C++
// SPDX-License-Identifier: GPL-3.0-only
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/*
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* PolyMC - Minecraft Launcher
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* Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
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*
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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, version 3.
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*
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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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*
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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 <https://www.gnu.org/licenses/>.
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*
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* This file incorporates work covered by the following copyright and
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* permission notice:
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*
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* Copyright 2013-2021 MultiMC Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "GZip.h"
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#include <zlib.h>
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#include <QByteArray>
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bool GZip::unzip(const QByteArray &compressedBytes, QByteArray &uncompressedBytes)
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{
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if (compressedBytes.size() == 0)
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{
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uncompressedBytes = compressedBytes;
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return true;
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}
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unsigned uncompLength = compressedBytes.size();
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uncompressedBytes.clear();
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uncompressedBytes.resize(uncompLength);
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z_stream strm;
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memset(&strm, 0, sizeof(strm));
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strm.next_in = (Bytef *)compressedBytes.data();
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strm.avail_in = compressedBytes.size();
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bool done = false;
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if (inflateInit2(&strm, (16 + MAX_WBITS)) != Z_OK)
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{
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return false;
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}
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int err = Z_OK;
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while (!done)
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{
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// If our output buffer is too small
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if (strm.total_out >= uncompLength)
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{
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uncompressedBytes.resize(uncompLength * 2);
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uncompLength *= 2;
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}
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strm.next_out = (Bytef *)(uncompressedBytes.data() + strm.total_out);
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strm.avail_out = uncompLength - strm.total_out;
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// Inflate another chunk.
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err = inflate(&strm, Z_SYNC_FLUSH);
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if (err == Z_STREAM_END)
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done = true;
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else if (err != Z_OK)
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{
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break;
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}
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}
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if (inflateEnd(&strm) != Z_OK || !done)
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{
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return false;
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}
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uncompressedBytes.resize(strm.total_out);
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return true;
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}
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bool GZip::zip(const QByteArray &uncompressedBytes, QByteArray &compressedBytes)
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{
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if (uncompressedBytes.size() == 0)
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{
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compressedBytes = uncompressedBytes;
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return true;
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}
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unsigned compLength = qMin(uncompressedBytes.size(), 16);
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compressedBytes.clear();
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compressedBytes.resize(compLength);
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z_stream zs;
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memset(&zs, 0, sizeof(zs));
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if (deflateInit2(&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, (16 + MAX_WBITS), 8, Z_DEFAULT_STRATEGY) != Z_OK)
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{
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return false;
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}
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zs.next_in = (Bytef*)uncompressedBytes.data();
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zs.avail_in = uncompressedBytes.size();
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int ret;
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compressedBytes.resize(uncompressedBytes.size());
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unsigned offset = 0;
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unsigned temp = 0;
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do
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{
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auto remaining = compressedBytes.size() - offset;
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if(remaining < 1)
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{
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compressedBytes.resize(compressedBytes.size() * 2);
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}
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zs.next_out = (Bytef *) (compressedBytes.data() + offset);
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temp = zs.avail_out = compressedBytes.size() - offset;
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ret = deflate(&zs, Z_FINISH);
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offset += temp - zs.avail_out;
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} while (ret == Z_OK);
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compressedBytes.resize(offset);
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if (deflateEnd(&zs) != Z_OK)
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{
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return false;
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}
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if (ret != Z_STREAM_END)
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{
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return false;
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}
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return true;
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}
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