From b6d455a02bd338e9dc0faa09d4d8177ecd8d569a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Petr=20Mr=C3=A1zek?= Date: Sun, 10 Apr 2016 15:53:05 +0200 Subject: NOISSUE reorganize and document libraries --- libraries/classparser/CMakeLists.txt | 41 +++ libraries/classparser/include/classparser_config.h | 22 ++ libraries/classparser/include/javautils.h | 29 +++ libraries/classparser/src/annotations.cpp | 85 +++++++ libraries/classparser/src/annotations.h | 277 +++++++++++++++++++++ libraries/classparser/src/classfile.h | 156 ++++++++++++ libraries/classparser/src/constants.h | 220 ++++++++++++++++ libraries/classparser/src/errors.h | 8 + libraries/classparser/src/javaendian.h | 76 ++++++ libraries/classparser/src/javautils.cpp | 83 ++++++ libraries/classparser/src/membuffer.h | 63 +++++ 11 files changed, 1060 insertions(+) create mode 100644 libraries/classparser/CMakeLists.txt create mode 100644 libraries/classparser/include/classparser_config.h create mode 100644 libraries/classparser/include/javautils.h create mode 100644 libraries/classparser/src/annotations.cpp create mode 100644 libraries/classparser/src/annotations.h create mode 100644 libraries/classparser/src/classfile.h create mode 100644 libraries/classparser/src/constants.h create mode 100644 libraries/classparser/src/errors.h create mode 100644 libraries/classparser/src/javaendian.h create mode 100644 libraries/classparser/src/javautils.cpp create mode 100644 libraries/classparser/src/membuffer.h (limited to 'libraries/classparser') diff --git a/libraries/classparser/CMakeLists.txt b/libraries/classparser/CMakeLists.txt new file mode 100644 index 00000000..a6c3fa14 --- /dev/null +++ b/libraries/classparser/CMakeLists.txt @@ -0,0 +1,41 @@ +project(classparser) + +set(CMAKE_AUTOMOC ON) + +######## Check endianness ######## +include(TestBigEndian) +test_big_endian(BIGENDIAN) +if(${BIGENDIAN}) + add_definitions(-DMULTIMC_BIG_ENDIAN) +endif(${BIGENDIAN}) + +# Find Qt +find_package(Qt5Core REQUIRED) + +# Include Qt headers. +include_directories(${Qt5Base_INCLUDE_DIRS}) + +set(CLASSPARSER_HEADERS +# Public headers +include/classparser_config.h +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 +) + +add_definitions(-DCLASSPARSER_LIBRARY) + +add_library(classparser SHARED ${CLASSPARSER_SOURCES} ${CLASSPARSER_HEADERS}) +target_include_directories(classparser PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include") +qt5_use_modules(classparser Core) diff --git a/libraries/classparser/include/classparser_config.h b/libraries/classparser/include/classparser_config.h new file mode 100644 index 00000000..bfd4dcb4 --- /dev/null +++ b/libraries/classparser/include/classparser_config.h @@ -0,0 +1,22 @@ +/* Copyright 2013-2015 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 + +#ifdef CLASSPARSER_LIBRARY +#define CLASSPARSER_EXPORT Q_DECL_EXPORT +#else +#define CLASSPARSER_EXPORT Q_DECL_IMPORT +#endif diff --git a/libraries/classparser/include/javautils.h b/libraries/classparser/include/javautils.h new file mode 100644 index 00000000..43cca4bc --- /dev/null +++ b/libraries/classparser/include/javautils.h @@ -0,0 +1,29 @@ +/* Copyright 2013-2015 MultiMC Contributors + * + * Authors: Orochimarufan + * + * 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 +#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/libraries/classparser/src/annotations.cpp b/libraries/classparser/src/annotations.cpp new file mode 100644 index 00000000..d1a7c046 --- /dev/null +++ b/libraries/classparser/src/annotations.cpp @@ -0,0 +1,85 @@ +#include "classfile.h" +#include "annotations.h" +#include + +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 &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 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/libraries/classparser/src/annotations.h b/libraries/classparser/src/annotations.h new file mode 100644 index 00000000..aa25d241 --- /dev/null +++ b/libraries/classparser/src/annotations.h @@ -0,0 +1,277 @@ +#pragma once +#include "classfile.h" +#include +#include + +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> 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_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 elem_vec; + +protected: + elem_vec values; + +public: + element_value_array(element_value_type type, std::vector &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/libraries/classparser/src/classfile.h b/libraries/classparser/src/classfile.h new file mode 100644 index 00000000..a5e7ee50 --- /dev/null +++ b/libraries/classparser/src/classfile.h @@ -0,0 +1,156 @@ +#pragma once +#include "membuffer.h" +#include "constants.h" +#include "annotations.h" +#include +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 interfaces; + // FIXME: doesn't free up memory on delete + java::annotation_table visible_class_annotations; +}; +} \ No newline at end of file diff --git a/libraries/classparser/src/constants.h b/libraries/classparser/src/constants.h new file mode 100644 index 00000000..242b943e --- /dev/null +++ b/libraries/classparser/src/constants.h @@ -0,0 +1,220 @@ +#pragma once +#include "errors.h" +#include + +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 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/libraries/classparser/src/errors.h b/libraries/classparser/src/errors.h new file mode 100644 index 00000000..ddbbd828 --- /dev/null +++ b/libraries/classparser/src/errors.h @@ -0,0 +1,8 @@ +#pragma once +#include +namespace java +{ +class classfile_exception : public std::exception +{ +}; +} diff --git a/libraries/classparser/src/javaendian.h b/libraries/classparser/src/javaendian.h new file mode 100644 index 00000000..d488b382 --- /dev/null +++ b/libraries/classparser/src/javaendian.h @@ -0,0 +1,76 @@ +#pragma once +#include + +/** + * 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/libraries/classparser/src/javautils.cpp b/libraries/classparser/src/javautils.cpp new file mode 100644 index 00000000..f9310e5f --- /dev/null +++ b/libraries/classparser/src/javautils.cpp @@ -0,0 +1,83 @@ +/* Copyright 2013-2015 MultiMC Contributors + * + * Authors: Orochimarufan + * + * 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 "javautils.h" + +#include +#include + +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/libraries/classparser/src/membuffer.h b/libraries/classparser/src/membuffer.h new file mode 100644 index 00000000..ab83412a --- /dev/null +++ b/libraries/classparser/src/membuffer.h @@ -0,0 +1,63 @@ +#pragma once +#include +#include +#include +#include +#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 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 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; +}; +} -- cgit v1.2.3