1 files changed, 127 insertions, 0 deletions
diff --git a/meshmc/launcher/GZip.cpp b/meshmc/launcher/GZip.cpp
new file mode 100644
index 0000000000..2f63e93bd5
--- /dev/null
+++ b/meshmc/launcher/GZip.cpp
@@ -0,0 +1,127 @@
+/* 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;
+}
+\ No newline at end of file