Move all the things (YES. Move them.)

Also, implemented some basic modlist logic, to be wired up.

11 files changed, 1006 insertions, 0 deletions

diff --git a/depends/classparser/CMakeLists.txt b/depends/classparser/CMakeLists.txt
new file mode 100644
index 00000000..5a48e002
--- /dev/null
+++ b/depends/classparser/CMakeLists.txt
@@ -0,0 +1,41 @@
+project(classparser)
+
+set(CMAKE_AUTOMOC ON)
+
+# Find Qt
+find_package(Qt5Core REQUIRED)
+
+# Include Qt headers.
+include_directories(${Qt5Base_INCLUDE_DIRS})
+
+SET(CLASSPARSER_HEADERS
+include/classparser_config.h
+
+# Public headers
+include/javautils.h
+
+# Private headers
+src/annotations.h
+src/classfile.h
+src/constants.h
+src/errors.h
+src/javaendian.h
+src/membuffer.h
+)
+
+SET(CLASSPARSER_SOURCES
+src/javautils.cpp
+src/annotations.cpp
+)
+
+# Set the include dir path.
+SET(LIBGROUPVIEW_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/include" PARENT_SCOPE)
+
+# Include self.
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
+include_directories(${CMAKE_BINARY_DIR}/include)
+
+add_definitions(-DCLASSPARSER_LIBRARY)
+
+add_library(classparser SHARED ${CLASSPARSER_SOURCES} ${CLASSPARSER_HEADERS})
+qt5_use_modules(classparser Core)
diff --git a/depends/classparser/include/classparser_config.h b/depends/classparser/include/classparser_config.h
new file mode 100644
index 00000000..fe6a2ab9
--- /dev/null
+++ b/depends/classparser/include/classparser_config.h
@@ -0,0 +1,23 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * 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 <QtCore/QtGlobal>
+
+#ifdef CLASSPARSER_LIBRARY
+#  define CLASSPARSER_EXPORT Q_DECL_EXPORT
+#else
+#  define CLASSPARSER_EXPORT Q_DECL_IMPORT
+#endif
+
diff --git a/depends/classparser/include/javautils.h b/depends/classparser/include/javautils.h
new file mode 100644
index 00000000..63e5ec26
--- /dev/null
+++ b/depends/classparser/include/javautils.h
@@ -0,0 +1,29 @@
+/* Copyright 2013 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.
+ */
+#pragma once
+#include <QString>
+#include "classparser_config.h"
+
+#define MCVer_Unknown "Unknown"
+
+namespace javautils
+{
+	/**
+	 * @brief Get the version from a minecraft.jar by parsing its class files. Expensive!
+	 */
+	QString GetMinecraftJarVersion(QString jar);
+}
diff --git a/depends/classparser/src/annotations.cpp b/depends/classparser/src/annotations.cpp
new file mode 100644
index 00000000..fc0c98fa
--- /dev/null
+++ b/depends/classparser/src/annotations.cpp
@@ -0,0 +1,83 @@
+#include "classfile.h"
+#include "annotations.h"
+#include <sstream>
+
+namespace java
+{
+	std::string annotation::toString()
+	{
+		std::ostringstream ss;
+		ss << "Annotation type : " << type_index << " - " << pool[type_index].str_data << std::endl;
+		ss << "Contains " << name_val_pairs.size() << " pairs:" << std::endl;
+		for(unsigned i = 0; i < name_val_pairs.size(); i++)
+		{
+			std::pair<uint16_t, element_value *> &val = name_val_pairs[i];
+			auto name_idx = val.first;
+			ss << pool[name_idx].str_data << "(" << name_idx << ")" << " = " << val.second->toString() << std::endl;
+		}
+		return ss.str();
+	}
+
+	annotation * annotation::read (util::membuffer& input, constant_pool& pool)
+	{
+		uint16_t type_index = 0;
+		input.read_be(type_index);
+		annotation * ann = new annotation(type_index,pool);
+		
+		uint16_t num_pairs = 0;
+		input.read_be(num_pairs);
+		while(num_pairs)
+		{
+			uint16_t name_idx = 0;
+			// read name index
+			input.read_be(name_idx);
+			auto elem = element_value::readElementValue(input,pool);
+			// read value
+			ann->add_pair(name_idx, elem);
+			num_pairs --;
+		}
+		return ann;
+	}
+	
+	element_value* element_value::readElementValue ( util::membuffer& input, java::constant_pool& pool )
+	{
+		element_value_type type = INVALID;
+		input.read(type);
+		uint16_t index = 0;
+		uint16_t index2 = 0;
+		std::vector <element_value *> vals;
+		switch (type)
+		{
+		case PRIMITIVE_BYTE:
+		case PRIMITIVE_CHAR:
+		case PRIMITIVE_DOUBLE:
+		case PRIMITIVE_FLOAT:
+		case PRIMITIVE_INT:
+		case PRIMITIVE_LONG:
+		case PRIMITIVE_SHORT:
+		case PRIMITIVE_BOOLEAN:
+		case STRING:
+			input.read_be(index);
+			return new element_value_simple(type, index, pool);
+		case ENUM_CONSTANT:
+			input.read_be(index);
+			input.read_be(index2);
+			return new element_value_enum(type, index, index2, pool);
+		case CLASS: // Class
+			input.read_be(index);
+			return new element_value_class(type, index, pool);
+		case ANNOTATION: // Annotation
+			// FIXME: runtime visibility info needs to be passed from parent
+			return new element_value_annotation(ANNOTATION, annotation::read(input, pool), pool);
+		case ARRAY: // Array
+			input.read_be(index);
+			for (int i = 0; i < index; i++)
+			{
+				vals.push_back(element_value::readElementValue(input, pool));
+			}
+			return new element_value_array(ARRAY, vals, pool);
+		default:
+			throw new java::classfile_exception();
+		}
+	}
+}
\ No newline at end of file
diff --git a/depends/classparser/src/annotations.h b/depends/classparser/src/annotations.h
new file mode 100644
index 00000000..b115dc0b
--- /dev/null
+++ b/depends/classparser/src/annotations.h
@@ -0,0 +1,252 @@
+#pragma once
+#include "classfile.h"
+#include <map>
+#include <vector>
+
+namespace java
+{
+	enum element_value_type : uint8_t
+	{
+		INVALID = 0,
+		STRING = 's',
+		ENUM_CONSTANT = 'e',
+		CLASS = 'c',
+		ANNOTATION = '@',
+		ARRAY = '[', // one array dimension
+		PRIMITIVE_INT = 'I', // integer
+		PRIMITIVE_BYTE = 'B', // signed byte
+		PRIMITIVE_CHAR = 'C', // Unicode character code point in the Basic Multilingual Plane, encoded with UTF-16
+		PRIMITIVE_DOUBLE = 'D', // double-precision floating-point value
+		PRIMITIVE_FLOAT = 'F', // single-precision floating-point value
+		PRIMITIVE_LONG = 'J', // long integer
+		PRIMITIVE_SHORT = 'S', // signed short
+		PRIMITIVE_BOOLEAN = 'Z' // true or false
+	};
+	/**
+	 * The element_value structure is a discriminated union representing the value of an element-value pair.
+	 * It is used to represent element values in all attributes that describe annotations
+	 * - RuntimeVisibleAnnotations
+	 * - RuntimeInvisibleAnnotations
+	 * - RuntimeVisibleParameterAnnotations
+	 * - RuntimeInvisibleParameterAnnotations).
+	 *
+	 * The element_value structure has the following format:
+	 */
+	class element_value
+	{
+	protected:
+		element_value_type type;
+		constant_pool & pool;
+
+	public:
+		element_value(element_value_type type, constant_pool & pool): type(type), pool(pool) {};
+
+		element_value_type getElementValueType()
+		{
+			return type;
+		}
+		
+		virtual std::string toString() = 0;
+
+		static element_value * readElementValue(util::membuffer & input, constant_pool & pool);
+	};
+	
+	/**
+	 * Each value of the annotations table represents a single runtime-visible annotation on a program element.
+	 * The annotation structure has the following format:
+	 */
+	class annotation
+	{
+	public:
+		typedef std::vector< std::pair<uint16_t, element_value * > > value_list;
+	protected:
+		/**
+		 * The value of the type_index item must be a valid index into the constant_pool table.
+		 * The constant_pool entry at that index must be a CONSTANT_Utf8_info (§4.4.7) structure
+		 * representing a field descriptor representing the annotation type corresponding
+		 * to the annotation represented by this annotation structure.
+		 */
+		uint16_t type_index;
+		/**
+		 * map between element_name_index and value.
+		 * 
+		 * The value of the element_name_index item must be a valid index into the constant_pool table.
+		 * The constant_pool entry at that index must be a CONSTANT_Utf8_info (§4.4.7) structure representing
+		 * a valid field descriptor (§4.3.2) that denotes the name of the annotation type element represented
+		 * by this element_value_pairs entry.
+		 */
+		value_list name_val_pairs;
+		/**
+		 * Reference to the parent constant pool
+		 */
+		constant_pool & pool;
+	public:
+		annotation(uint16_t type_index, constant_pool& pool):type_index(type_index), pool(pool) {};
+		~annotation()
+		{
+			for(unsigned i = 0 ; i < name_val_pairs.size(); i++)
+			{
+				delete name_val_pairs[i].second;
+			}
+		}
+		void add_pair(uint16_t key, element_value * value)
+		{
+			name_val_pairs.push_back(std::make_pair(key, value));
+		};
+		value_list::const_iterator begin()
+		{
+			return name_val_pairs.cbegin();
+		}
+		value_list::const_iterator end()
+		{
+			return name_val_pairs.cend();
+		}
+		std::string toString();
+		static annotation * read(util::membuffer & input, constant_pool & pool);
+	};
+	typedef std::vector<annotation *> annotation_table;
+	
+	
+	/// type for simple value annotation elements
+	class element_value_simple : public element_value
+	{
+	protected:
+		/// index of the constant in the constant pool
+		uint16_t index;
+	public:
+		element_value_simple(element_value_type type, uint16_t index , constant_pool& pool):
+		element_value(type, pool), index(index)
+		{
+			// TODO: verify consistency
+		};
+		uint16_t getIndex()
+		{
+			return index;
+		}
+		virtual std::string toString()
+		{
+			return pool[index].toString();
+		};
+	};
+	/// The enum_const_value item is used if the tag item is 'e'.
+	class element_value_enum : public element_value
+	{
+	protected:
+		/**
+		 * The value of the type_name_index item must be a valid index into the constant_pool table.
+		 * The constant_pool entry at that index must be a CONSTANT_Utf8_info (§4.4.7) structure
+		 * representing a valid field descriptor (§4.3.2) that denotes the internal form of the binary
+		 * name (§4.2.1) of the type of the enum constant represented by this element_value structure.
+		 */
+		uint16_t typeIndex;
+		/**
+		 * The value of the const_name_index item must be a valid index into the constant_pool table.
+		 * The constant_pool entry at that index must be a CONSTANT_Utf8_info (§4.4.7) structure
+		 * representing the simple name of the enum constant represented by this element_value structure.
+		 */
+		uint16_t valueIndex;
+	public:
+		element_value_enum(element_value_type type, uint16_t typeIndex, uint16_t valueIndex, constant_pool& pool):
+		element_value(type, pool), typeIndex(typeIndex), valueIndex(valueIndex)
+		{
+			// TODO: verify consistency
+		}
+		uint16_t getValueIndex()
+		{
+			return valueIndex;
+		}
+		uint16_t getTypeIndex()
+		{
+			return typeIndex;
+		}
+		virtual std::string toString()
+		{
+			return "enum value";
+		};
+	};
+	
+	class element_value_class : public element_value
+	{
+	protected:
+		/**
+		 * The class_info_index item must be a valid index into the constant_pool table.
+		 * The constant_pool entry at that index must be a CONSTANT_Utf8_info (§4.4.7) structure
+		 * representing the return descriptor (§4.3.3) of the type that is reified by the class
+		 * represented by this element_value structure.
+		 * 
+		 * For example, 'V' for Void.class, 'Ljava/lang/Object;' for Object, etc.
+		 * 
+		 * Or in plain english, you can store type information in annotations. Yay.
+		 */
+		uint16_t classIndex;
+	public:
+		element_value_class(element_value_type type, uint16_t classIndex, constant_pool& pool):
+		element_value(type, pool), classIndex(classIndex)
+		{
+			// TODO: verify consistency
+		}
+		uint16_t getIndex()
+		{
+			return classIndex;
+		}
+		virtual std::string toString()
+		{
+			return "class";
+		};
+	};
+	
+	/// nested annotations... yay
+	class element_value_annotation : public element_value
+	{
+	private:
+		annotation * nestedAnnotation;
+	public:
+		element_value_annotation(element_value_type type, annotation * nestedAnnotation, constant_pool& pool):
+		element_value(type, pool), nestedAnnotation(nestedAnnotation)
+		{};
+		~element_value_annotation()
+		{
+			if(nestedAnnotation)
+			{
+				delete nestedAnnotation;
+				nestedAnnotation = nullptr;
+			}
+		}
+		virtual std::string toString()
+		{
+			return "nested annotation";
+		};
+	};
+	
+	/// and arrays!
+	class element_value_array : public element_value
+	{
+	public:
+		typedef std::vector <element_value *> elem_vec;
+	protected:
+		elem_vec values;
+	public:
+		element_value_array ( element_value_type type, std::vector <element_value *>& values, constant_pool& pool ):
+		element_value(type, pool), values(values)
+		{};
+		~element_value_array ()
+		{
+			for(unsigned i = 0; i < values.size();i++)
+			{
+				delete values[i];
+			}
+		};
+		elem_vec::const_iterator begin()
+		{
+			return values.cbegin();
+		}
+		elem_vec::const_iterator end()
+		{
+			return values.cend();
+		}
+		virtual std::string toString()
+		{
+			return "array";
+		};
+	};
+}
\ No newline at end of file
diff --git a/depends/classparser/src/classfile.h b/depends/classparser/src/classfile.h
new file mode 100644
index 00000000..33207e99
--- /dev/null
+++ b/depends/classparser/src/classfile.h
@@ -0,0 +1,153 @@
+#pragma once
+#include "membuffer.h"
+#include "constants.h"
+#include "annotations.h"
+#include <map>
+namespace java
+{
+	/**
+	 * Class representing a Java .class file
+	 */
+	class classfile : public util::membuffer
+	{
+	public:
+		classfile(char * data, std::size_t size) : membuffer(data, size)
+		{
+			valid = false;
+			is_synthetic = false;
+			read_be(magic);
+			if(magic != 0xCAFEBABE)
+				throw new classfile_exception();
+			read_be(minor_version);
+			read_be(major_version);
+			constants.load(*this);
+			read_be(access_flags);
+			read_be(this_class);
+			read_be(super_class);
+			
+			// Interfaces
+			uint16_t iface_count = 0;
+			read_be(iface_count);
+			while (iface_count)
+			{
+				uint16_t iface;
+				read_be(iface);
+				interfaces.push_back(iface);
+				iface_count --;
+			}
+			
+			// Fields
+			// read fields (and attributes from inside fields) (and possible inner classes. yay for recursion!)
+			// for now though, we will ignore all attributes
+			/*
+			 * field_info
+			 * {
+			 * 	u2 access_flags;
+			 * 	u2 name_index;
+			 * 	u2 descriptor_index;
+			 * 	u2 attributes_count;
+			 * 	attribute_info attributes[attributes_count];
+			 * }
+			 */
+			uint16_t field_count = 0;
+			read_be(field_count);
+			while (field_count)
+			{
+				// skip field stuff
+				skip(6);
+				// and skip field attributes
+				uint16_t attr_count = 0;
+				read_be(attr_count);
+				while(attr_count)
+				{
+					skip(2);
+					uint32_t attr_length = 0;
+					read_be(attr_length);
+					skip(attr_length);
+					attr_count --;
+				}
+				field_count --;
+			}
+
+			// class methods
+			/*
+			 * method_info
+			 * {
+			 * 	u2 access_flags;
+			 * 	u2 name_index;
+			 * 	u2 descriptor_index;
+			 * 	u2 attributes_count;
+			 * 	attribute_info attributes[attributes_count];
+			 * }
+			 */
+			uint16_t method_count = 0;
+			read_be(method_count);
+			while( method_count )
+			{
+				skip(6);
+				// and skip method attributes
+				uint16_t attr_count = 0;
+				read_be(attr_count);
+				while(attr_count)
+				{
+					skip(2);
+					uint32_t attr_length = 0;
+					read_be(attr_length);
+					skip(attr_length);
+					attr_count --;
+				}
+				method_count --;
+			}
+
+			// class attributes
+			// there are many kinds of attributes. this is just the generic wrapper structure.
+			// type is decided by attribute name. extensions to the standard are *possible*
+			// class annotations are one kind of a attribute (one per class)
+			/*
+			 * attribute_info
+			 * {
+			 * 	u2 attribute_name_index;
+			 * 	u4 attribute_length;
+			 * 	u1 info[attribute_length];
+			 * }
+			 */
+			uint16_t class_attr_count = 0;
+			read_be(class_attr_count);
+			while(class_attr_count)
+			{
+				uint16_t name_idx = 0;
+				read_be(name_idx);
+				uint32_t attr_length = 0;
+				read_be(attr_length);
+				
+				auto name = constants[name_idx];
+				if(name.str_data == "RuntimeVisibleAnnotations")
+				{
+					uint16_t num_annotations = 0;
+					read_be(num_annotations);
+					while (num_annotations)
+					{
+						visible_class_annotations.push_back(annotation::read(*this, constants));
+						num_annotations --;
+					}
+				}
+				else skip(attr_length);
+				class_attr_count --;
+			}
+			valid = true;
+		};
+		bool valid;
+		bool is_synthetic;
+		uint32_t magic;
+		uint16_t minor_version;
+		uint16_t major_version;
+		constant_pool constants;
+		uint16_t access_flags;
+		uint16_t this_class;
+		uint16_t super_class;
+		// interfaces this class implements ? must be. investigate.
+		std::vector<uint16_t> interfaces;
+		// FIXME: doesn't free up memory on delete
+		java::annotation_table visible_class_annotations;
+	};
+}
\ No newline at end of file
diff --git a/depends/classparser/src/constants.h b/depends/classparser/src/constants.h
new file mode 100644
index 00000000..61aa5687
--- /dev/null
+++ b/depends/classparser/src/constants.h
@@ -0,0 +1,212 @@
+#pragma once
+#include "errors.h"
+#include <sstream>
+
+namespace java
+{
+	class constant
+	{
+	public:
+		enum type_t : uint8_t
+		{
+			j_hole = 0, // HACK: this is a hole in the array, because java is crazy
+			j_string_data = 1,
+			j_int = 3,
+			j_float = 4,
+			j_long = 5,
+			j_double = 6,
+			j_class = 7,
+			j_string = 8,
+			j_fieldref = 9,
+			j_methodref = 10,
+			j_interface_methodref = 11,
+			j_nameandtype = 12
+		} type;
+
+		constant(util::membuffer & buf )
+		{
+			buf.read(type);
+			// invalid constant type!
+			if(type > j_nameandtype || type == (type_t)0 || type == (type_t)2)
+				throw new classfile_exception();
+			
+			// load data depending on type
+			switch(type)
+			{
+				case j_float:
+				case j_int:
+					buf.read_be(int_data); // same as float data really
+					break;
+				case j_double:
+				case j_long:
+					buf.read_be(long_data); // same as double
+					break;
+				case j_class:
+					buf.read_be(ref_type.class_idx);
+					break;
+				case j_fieldref:
+				case j_methodref:
+				case j_interface_methodref:
+					buf.read_be(ref_type.class_idx);
+					buf.read_be(ref_type.name_and_type_idx);
+					break;
+				case j_string:
+					buf.read_be(index);
+					break;
+				case j_string_data:
+					// HACK HACK: for now, we call these UTF-8 and do no further processing.
+					// Later, we should do some decoding. It's really modified UTF-8
+					// * U+0000 is represented as 0xC0,0x80 invalid character
+					// * any single zero byte ends the string
+					// * characters above U+10000 are encoded like in CESU-8
+					buf.read_jstr(str_data);
+					break;
+				case j_nameandtype:
+					buf.read_be(name_and_type.name_index);
+					buf.read_be(name_and_type.descriptor_index);
+					break;
+			}
+		}
+
+		constant(int fake)
+		{
+			type = j_hole;
+		}
+
+		std::string toString()
+		{
+			std::ostringstream ss;
+			switch(type)
+			{
+				case j_hole:
+					ss << "Fake legacy entry";
+					break;
+				case j_float:
+					ss << "Float: " << float_data;
+					break;
+				case j_double:
+					ss << "Double: " << double_data;
+					break;
+				case j_int:
+					ss << "Int: " << int_data;
+					break;
+				case j_long:
+					ss << "Long: " << long_data;
+					break;
+				case j_string_data:
+					ss << "StrData: " << str_data;
+					break;
+				case j_string:
+					ss << "Str: " << index;
+					break;
+				case j_fieldref:
+					ss << "FieldRef: " << ref_type.class_idx << " " << ref_type.name_and_type_idx;
+					break;
+				case j_methodref:
+					ss << "MethodRef: " << ref_type.class_idx << " " << ref_type.name_and_type_idx;
+					break;
+				case j_interface_methodref:
+					ss << "IfMethodRef: " << ref_type.class_idx << " " << ref_type.name_and_type_idx;
+					break;
+				case j_class:
+					ss << "Class: " << ref_type.class_idx;
+					break;
+				case j_nameandtype:
+					ss << "NameAndType: " << name_and_type.name_index << " " << name_and_type.descriptor_index;
+					break;
+			}
+			return ss.str();
+		}
+
+		std::string str_data; /** String data in 'modified utf-8'.*/
+		// store everything here.
+		union
+		{
+			int32_t int_data;
+			int64_t long_data;
+			float float_data;
+			double double_data;
+			uint16_t index;
+			struct
+			{
+				/**
+				 * Class reference:
+				 *   an index within the constant pool to a UTF-8 string containing
+				 *   the fully qualified class name (in internal format)
+				 * Used for j_class, j_fieldref, j_methodref and j_interface_methodref
+				 */
+				uint16_t class_idx;
+				// used for j_fieldref, j_methodref and j_interface_methodref
+				uint16_t name_and_type_idx;
+			} ref_type;
+			struct
+			{
+				uint16_t name_index;
+				uint16_t descriptor_index;
+			} name_and_type;
+		};
+	};
+
+	/**
+	 * A helper class that represents the custom container used in Java class file for storage of constants
+	 */
+	class constant_pool
+	{
+	public:
+		/**
+		 * Create a pool of constants
+		 */
+		constant_pool(){}
+		/**
+		 * Load a java constant pool
+		 */
+		void load(util::membuffer & buf)
+		{
+			uint16_t length = 0;
+			buf.read_be(length);
+			length --;
+			uint16_t index = 1;
+			const constant * last_constant = nullptr;
+			while(length)
+			{
+				const constant & cnst = constant(buf);
+				constants.push_back(cnst);
+				last_constant = &constants[constants.size() - 1];
+				if(last_constant->type == constant::j_double || last_constant->type == constant::j_long)
+				{
+					// push in a fake constant to preserve indexing
+					constants.push_back(constant(0));
+					length-=2;
+					index+=2;
+				}
+				else
+				{
+					length--;
+					index++;
+				}
+			}
+		}
+		typedef std::vector<java::constant> container_type;
+		/**
+		 * Access constants based on jar file index numbers (index of the first element is 1)
+		 */
+		java::constant & operator[](std::size_t constant_index)
+		{
+			if(constant_index == 0 || constant_index > constants.size())
+			{
+				throw new classfile_exception();
+			}
+			return constants[constant_index - 1];
+		};
+		container_type::const_iterator begin() const
+		{
+			return constants.begin();
+		};
+		container_type::const_iterator end() const
+		{
+			return constants.end();
+		}
+	private:
+		container_type constants;
+	};
+}
diff --git a/depends/classparser/src/errors.h b/depends/classparser/src/errors.h
new file mode 100644
index 00000000..c02b07c8
--- /dev/null
+++ b/depends/classparser/src/errors.h
@@ -0,0 +1,6 @@
+#pragma once
+#include <exception>
+namespace java
+{
+	class classfile_exception : public std::exception {};
+}
diff --git a/depends/classparser/src/javaendian.h b/depends/classparser/src/javaendian.h
new file mode 100644
index 00000000..fa6207fe
--- /dev/null
+++ b/depends/classparser/src/javaendian.h
@@ -0,0 +1,62 @@
+#pragma once
+#include <stdint.h>
+
+/**
+ * Swap bytes between big endian and local number representation
+ */
+namespace util
+{
+#ifdef MULTIMC_BIG_ENDIAN
+inline uint64_t bigswap(uint64_t x)
+{
+	return x;
+};
+inline uint32_t bigswap(uint32_t x)
+{
+	return x;
+};
+inline uint16_t bigswap(uint16_t x)
+{
+	return x;
+};
+inline int64_t bigswap(int64_t x)
+{
+	return x;
+};
+inline int32_t bigswap(int32_t x)
+{
+	return x;
+};
+inline int16_t bigswap(int16_t x)
+{
+	return x;
+};
+#else
+inline uint64_t bigswap(uint64_t x)
+{
+	return (x>>56) | ((x<<40) & 0x00FF000000000000) | ((x<<24) & 0x0000FF0000000000) | ((x<<8)  & 0x000000FF00000000) |
+			((x>>8)  & 0x00000000FF000000) | ((x>>24) & 0x0000000000FF0000) | ((x>>40) & 0x000000000000FF00) | (x<<56);
+};
+inline uint32_t bigswap(uint32_t x)
+{
+	return (x>>24) | ((x<<8) & 0x00FF0000) | ((x>>8) & 0x0000FF00) | (x<<24);
+};
+inline uint16_t bigswap(uint16_t x)
+{
+	return (x>>8) | (x<<8);
+};
+inline int64_t bigswap(int64_t x)
+{
+	return (x>>56) | ((x<<40) & 0x00FF000000000000) | ((x<<24) & 0x0000FF0000000000) | ((x<<8)  & 0x000000FF00000000) |
+			((x>>8)  & 0x00000000FF000000) | ((x>>24) & 0x0000000000FF0000) | ((x>>40) & 0x000000000000FF00) | (x<<56);
+};
+inline int32_t bigswap(int32_t x)
+{
+	return (x>>24) | ((x<<8) & 0x00FF0000) | ((x>>8) & 0x0000FF00) | (x<<24);
+};
+inline int16_t bigswap(int16_t x)
+{
+	return (x>>8) | (x<<8);
+};
+#endif
+}
diff --git a/depends/classparser/src/javautils.cpp b/depends/classparser/src/javautils.cpp
new file mode 100644
index 00000000..4a359031
--- /dev/null
+++ b/depends/classparser/src/javautils.cpp
@@ -0,0 +1,81 @@
+/* Copyright 2013 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 "multimc_pragma.h"
+#include "classfile.h"
+#include "javautils.h"
+
+#include <QFile>
+#include <quazipfile.h>
+
+namespace javautils
+{
+
+QString GetMinecraftJarVersion(QString jarName)
+{
+	QString version = MCVer_Unknown;
+
+	// 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;
+			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;
+}
+
+}
diff --git a/depends/classparser/src/membuffer.h b/depends/classparser/src/membuffer.h
new file mode 100644
index 00000000..2ea3a69b
--- /dev/null
+++ b/depends/classparser/src/membuffer.h
@@ -0,0 +1,64 @@
+#pragma once
+#include <stdint.h>
+#include <string>
+#include <vector>
+#include <exception>
+#include "javaendian.h"
+
+namespace util
+{
+	class membuffer
+	{
+	public:
+		membuffer(char * buffer, std::size_t size)
+		{
+			current = start = buffer;
+			end = start + size;
+		}
+		~membuffer()
+		{
+			// maybe? possibly? left out to avoid confusion. for now.
+			//delete start;
+		}
+		/**
+			* Read some value. That's all ;)
+			*/
+		template <class T>
+		void read(T& val)
+		{
+			val = *(T *)current;
+			current += sizeof(T);
+		}
+		/**
+			* Read a big-endian number
+			* valid for 2-byte, 4-byte and 8-byte variables
+			*/
+		template <class T>
+		void read_be(T& val)
+		{
+			val = util::bigswap(*(T *)current);
+			current += sizeof(T);
+		}
+		/**
+			* Read a string in the format:
+			* 2B length (big endian, unsigned)
+			* length bytes data
+			*/
+		void read_jstr(std::string & str)
+		{
+			uint16_t length = 0;
+			read_be(length);
+			str.append(current,length);
+			current += length;
+		}
+		/**
+			* Skip N bytes
+			*/
+		void skip (std::size_t N)
+		{
+			current += N;
+		}
+	private:
+		char * start, *end, *current;
+	};
+}