82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
/* Copyright 2013 MultiMC Contributors
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*
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* Authors: Orochimarufan <orochimarufan.x3@gmail.com>
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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 "multimc_pragma.h"
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#include "classfile.h"
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#include "javautils.h"
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#include <QFile>
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#include <quazipfile.h>
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namespace javautils
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{
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QString GetMinecraftJarVersion(QString jarName)
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{
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QString version = MCVer_Unknown;
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// check if minecraft.jar exists
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QFile jar(jarName);
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if (!jar.exists())
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return version;
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// open minecraft.jar
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QuaZip zip(&jar);
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if (!zip.open(QuaZip::mdUnzip))
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return version;
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// open Minecraft.class
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zip.setCurrentFile("net/minecraft/client/Minecraft.class", QuaZip::csSensitive);
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QuaZipFile Minecraft(&zip);
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if (!Minecraft.open(QuaZipFile::ReadOnly))
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return version;
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// read Minecraft.class
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qint64 size = Minecraft.size();
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char *classfile = new char[size];
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Minecraft.read(classfile, size);
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// parse Minecraft.class
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try {
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char *temp = classfile;
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java::classfile MinecraftClass(temp, size);
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java::constant_pool constants = MinecraftClass.constants;
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for(java::constant_pool::container_type::const_iterator iter=constants.begin();
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iter != constants.end(); iter++)
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{
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const java::constant & constant = *iter;
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if (constant.type != java::constant::j_string_data)
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continue;
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const std::string & str = constant.str_data;
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if (str.compare(0, 20, "Minecraft Minecraft ") == 0)
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{
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version = str.substr(20).data();
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break;
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}
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}
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} catch(java::classfile_exception &) {}
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// clean up
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delete[] classfile;
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Minecraft.close();
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zip.close();
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jar.close();
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return version;
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}
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}
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