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/* SPDX-FileCopyrightText: 2026 Project Tick
* SPDX-FileContributor: Project Tick
* SPDX-License-Identifier: GPL-3.0-or-later
*
* MeshMC - A Custom Launcher for Minecraft
* Copyright (C) 2026 Project Tick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "GZip.h"
#include <zlib.h>
#include <QByteArray>
bool GZip::unzip(const QByteArray& compressedBytes,
QByteArray& uncompressedBytes)
{
if (compressedBytes.size() == 0) {
uncompressedBytes = compressedBytes;
return true;
}
unsigned uncompLength = compressedBytes.size();
uncompressedBytes.clear();
uncompressedBytes.resize(uncompLength);
z_stream strm;
memset(&strm, 0, sizeof(strm));
strm.next_in = (Bytef*)compressedBytes.data();
strm.avail_in = compressedBytes.size();
bool done = false;
if (inflateInit2(&strm, (16 + MAX_WBITS)) != Z_OK) {
return false;
}
int err = Z_OK;
while (!done) {
// If our output buffer is too small
if (strm.total_out >= uncompLength) {
uncompressedBytes.resize(uncompLength * 2);
uncompLength *= 2;
}
strm.next_out = (Bytef*)(uncompressedBytes.data() + strm.total_out);
strm.avail_out = uncompLength - strm.total_out;
// Inflate another chunk.
err = inflate(&strm, Z_SYNC_FLUSH);
if (err == Z_STREAM_END)
done = true;
else if (err != Z_OK) {
break;
}
}
if (inflateEnd(&strm) != Z_OK || !done) {
return false;
}
uncompressedBytes.resize(strm.total_out);
return true;
}
bool GZip::zip(const QByteArray& uncompressedBytes, QByteArray& compressedBytes)
{
if (uncompressedBytes.size() == 0) {
compressedBytes = uncompressedBytes;
return true;
}
unsigned compLength =
std::min(static_cast<qsizetype>(16), uncompressedBytes.size());
compressedBytes.clear();
compressedBytes.resize(compLength);
z_stream zs;
memset(&zs, 0, sizeof(zs));
if (deflateInit2(&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, (16 + MAX_WBITS),
8, Z_DEFAULT_STRATEGY) != Z_OK) {
return false;
}
zs.next_in = (Bytef*)uncompressedBytes.data();
zs.avail_in = uncompressedBytes.size();
int ret;
compressedBytes.resize(uncompressedBytes.size());
unsigned offset = 0;
unsigned temp = 0;
do {
auto remaining = compressedBytes.size() - offset;
if (remaining < 1) {
compressedBytes.resize(compressedBytes.size() * 2);
}
zs.next_out = (Bytef*)(compressedBytes.data() + offset);
temp = zs.avail_out = compressedBytes.size() - offset;
ret = deflate(&zs, Z_FINISH);
offset += temp - zs.avail_out;
} while (ret == Z_OK);
compressedBytes.resize(offset);
if (deflateEnd(&zs) != Z_OK) {
return false;
}
if (ret != Z_STREAM_END) {
return false;
}
return true;
}
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