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authorPetr Mrázek <peterix@gmail.com>2017-09-27 15:39:13 +0200
committerPetr Mrázek <peterix@gmail.com>2017-09-27 15:39:13 +0200
commitc51512f94036b7d13b98cb02b8e8c1e549e7b448 (patch)
treed44cc40472bf619cdb1a91238c02eaca4e6d0c78 /libraries/classparser/src/classparser.cpp
parent9a2d203c0d95e51ea02e3e62fef6289973777e84 (diff)
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NOISSUE use classparser for importing Legacy instances with undecided Minecraft versions
Diffstat (limited to 'libraries/classparser/src/classparser.cpp')
-rw-r--r--libraries/classparser/src/classparser.cpp85
1 files changed, 85 insertions, 0 deletions
diff --git a/libraries/classparser/src/classparser.cpp b/libraries/classparser/src/classparser.cpp
new file mode 100644
index 00000000..ebbdc887
--- /dev/null
+++ b/libraries/classparser/src/classparser.cpp
@@ -0,0 +1,85 @@
+/* Copyright 2013-2017 MultiMC Contributors
+ *
+ * Authors: Orochimarufan <orochimarufan.x3@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "classfile.h"
+#include "classparser.h"
+
+#include <QFile>
+#include <quazipfile.h>
+#include <QDebug>
+
+namespace classparser
+{
+
+QString GetMinecraftJarVersion(QString jarName)
+{
+ QString version;
+
+ // check if minecraft.jar exists
+ QFile jar(jarName);
+ if (!jar.exists())
+ return version;
+
+ // open minecraft.jar
+ QuaZip zip(&jar);
+ if (!zip.open(QuaZip::mdUnzip))
+ return version;
+
+ // open Minecraft.class
+ zip.setCurrentFile("net/minecraft/client/Minecraft.class", QuaZip::csSensitive);
+ QuaZipFile Minecraft(&zip);
+ if (!Minecraft.open(QuaZipFile::ReadOnly))
+ return version;
+
+ // read Minecraft.class
+ qint64 size = Minecraft.size();
+ char *classfile = new char[size];
+ Minecraft.read(classfile, size);
+
+ // parse Minecraft.class
+ try
+ {
+ char *temp = classfile;
+ java::classfile MinecraftClass(temp, size);
+ java::constant_pool constants = MinecraftClass.constants;
+ for (java::constant_pool::container_type::const_iterator iter = constants.begin();
+ iter != constants.end(); iter++)
+ {
+ const java::constant &constant = *iter;
+ if (constant.type != java::constant::j_string_data)
+ continue;
+ const std::string &str = constant.str_data;
+ qDebug() << QString::fromStdString(str);
+ if (str.compare(0, 20, "Minecraft Minecraft ") == 0)
+ {
+ version = str.substr(20).data();
+ break;
+ }
+ }
+ }
+ catch (java::classfile_exception &)
+ {
+ }
+
+ // clean up
+ delete[] classfile;
+ Minecraft.close();
+ zip.close();
+ jar.close();
+
+ return version;
+}
+}