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-rw-r--r--meshmc/libraries/classparser/CMakeLists.txt41
-rw-r--r--meshmc/libraries/classparser/include/classparser.h49
-rw-r--r--meshmc/libraries/classparser/include/classparser_config.h45
-rw-r--r--meshmc/libraries/classparser/src/annotations.cpp105
-rw-r--r--meshmc/libraries/classparser/src/annotations.h296
-rw-r--r--meshmc/libraries/classparser/src/classfile.h169
-rw-r--r--meshmc/libraries/classparser/src/classparser.cpp116
-rw-r--r--meshmc/libraries/classparser/src/constants.h241
-rw-r--r--meshmc/libraries/classparser/src/errors.h29
-rw-r--r--meshmc/libraries/classparser/src/javaendian.h84
-rw-r--r--meshmc/libraries/classparser/src/membuffer.h84
11 files changed, 1259 insertions, 0 deletions
diff --git a/meshmc/libraries/classparser/CMakeLists.txt b/meshmc/libraries/classparser/CMakeLists.txt
new file mode 100644
index 0000000000..f4776902cf
--- /dev/null
+++ b/meshmc/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(Qt6Core REQUIRED)
+
+# Include Qt headers.
+include_directories(${Qt6Base_INCLUDE_DIRS})
+
+set(CLASSPARSER_HEADERS
+# Public headers
+include/classparser_config.h
+include/classparser.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/classparser.cpp
+src/annotations.cpp
+)
+
+add_definitions(-DCLASSPARSER_LIBRARY)
+
+add_library(MeshMC_classparser STATIC ${CLASSPARSER_SOURCES} ${CLASSPARSER_HEADERS})
+target_include_directories(MeshMC_classparser PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include")
+target_link_libraries(MeshMC_classparser PRIVATE LibArchive::LibArchive Qt6::Core)
diff --git a/meshmc/libraries/classparser/include/classparser.h b/meshmc/libraries/classparser/include/classparser.h
new file mode 100644
index 0000000000..c39e4e800e
--- /dev/null
+++ b/meshmc/libraries/classparser/include/classparser.h
@@ -0,0 +1,49 @@
+/* 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/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ * Copyright 2013-2021 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.
+ */
+#pragma once
+#include <QString>
+#include "classparser_config.h"
+
+namespace classparser
+{
+ /**
+ * @brief Get the version from a minecraft.jar by parsing its class files.
+ * Expensive!
+ */
+ QString GetMinecraftJarVersion(QString jar);
+} // namespace classparser
diff --git a/meshmc/libraries/classparser/include/classparser_config.h b/meshmc/libraries/classparser/include/classparser_config.h
new file mode 100644
index 0000000000..644c392143
--- /dev/null
+++ b/meshmc/libraries/classparser/include/classparser_config.h
@@ -0,0 +1,45 @@
+/* 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/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ * Copyright 2013-2021 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/meshmc/libraries/classparser/src/annotations.cpp b/meshmc/libraries/classparser/src/annotations.cpp
new file mode 100644
index 0000000000..93288a8f0b
--- /dev/null
+++ b/meshmc/libraries/classparser/src/annotations.cpp
@@ -0,0 +1,105 @@
+/* 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 "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();
+ }
+ }
+} // namespace java \ No newline at end of file
diff --git a/meshmc/libraries/classparser/src/annotations.h b/meshmc/libraries/classparser/src/annotations.h
new file mode 100644
index 0000000000..644d28c0d4
--- /dev/null
+++ b/meshmc/libraries/classparser/src/annotations.h
@@ -0,0 +1,296 @@
+/* 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/>.
+ */
+
+#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) {};
+ virtual ~element_value() {}
+
+ 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";
+ };
+ };
+} // namespace java \ No newline at end of file
diff --git a/meshmc/libraries/classparser/src/classfile.h b/meshmc/libraries/classparser/src/classfile.h
new file mode 100644
index 0000000000..0832c8039d
--- /dev/null
+++ b/meshmc/libraries/classparser/src/classfile.h
@@ -0,0 +1,169 @@
+/* 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/>.
+ */
+
+#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;
+ };
+} // namespace java \ No newline at end of file
diff --git a/meshmc/libraries/classparser/src/classparser.cpp b/meshmc/libraries/classparser/src/classparser.cpp
new file mode 100644
index 0000000000..2dd4bdfba2
--- /dev/null
+++ b/meshmc/libraries/classparser/src/classparser.cpp
@@ -0,0 +1,116 @@
+/* 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/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ * Copyright 2013-2021 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 "classfile.h"
+#include "classparser.h"
+
+#include <QFile>
+#include <archive.h>
+#include <archive_entry.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 jar with libarchive
+ struct archive* a = archive_read_new();
+ archive_read_support_format_zip(a);
+ if (archive_read_open_filename(a, jarName.toUtf8().constData(),
+ 10240) != ARCHIVE_OK) {
+ archive_read_free(a);
+ return version;
+ }
+
+ // find and read Minecraft.class
+ QByteArray classData;
+ struct archive_entry* entry;
+ while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+ QString name = QString::fromUtf8(archive_entry_pathname(entry));
+ if (name == "net/minecraft/client/Minecraft.class") {
+ la_int64_t sz = archive_entry_size(entry);
+ if (sz > 0) {
+ classData.resize(sz);
+ archive_read_data(a, classData.data(), sz);
+ } else {
+ char buf[8192];
+ la_ssize_t r;
+ while ((r = archive_read_data(a, buf, sizeof(buf))) > 0)
+ classData.append(buf, r);
+ }
+ break;
+ }
+ archive_read_data_skip(a);
+ }
+ archive_read_free(a);
+
+ if (classData.isEmpty())
+ return version;
+
+ // parse Minecraft.class
+ try {
+ char* temp = classData.data();
+ qint64 size = classData.size();
+ 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_type_t::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 (const java::classfile_exception&) {
+ }
+
+ return version;
+ }
+} // namespace classparser
diff --git a/meshmc/libraries/classparser/src/constants.h b/meshmc/libraries/classparser/src/constants.h
new file mode 100644
index 0000000000..251026fcfc
--- /dev/null
+++ b/meshmc/libraries/classparser/src/constants.h
@@ -0,0 +1,241 @@
+/* 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/>.
+ */
+
+#pragma once
+#include "errors.h"
+#include <sstream>
+
+namespace java
+{
+ enum class constant_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
+ // FIXME: missing some constant types, see
+ // https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.4
+ };
+
+ struct ref_type_t {
+ /**
+ * 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;
+ };
+
+ struct name_and_type_t {
+ uint16_t name_index;
+ uint16_t descriptor_index;
+ };
+
+ class constant
+ {
+ public:
+ constant_type_t type = constant_type_t::j_hole;
+
+ constant(util::membuffer& buf)
+ {
+ buf.read(type);
+
+ // load data depending on type
+ switch (type) {
+ case constant_type_t::j_float:
+ buf.read_be(data.int_data);
+ break;
+ case constant_type_t::j_int:
+ buf.read_be(data.int_data); // same as float data really
+ break;
+ case constant_type_t::j_double:
+ buf.read_be(data.long_data);
+ break;
+ case constant_type_t::j_long:
+ buf.read_be(data.long_data); // same as double
+ break;
+ case constant_type_t::j_class:
+ buf.read_be(data.ref_type.class_idx);
+ break;
+ case constant_type_t::j_fieldref:
+ case constant_type_t::j_methodref:
+ case constant_type_t::j_interface_methodref:
+ buf.read_be(data.ref_type.class_idx);
+ buf.read_be(data.ref_type.name_and_type_idx);
+ break;
+ case constant_type_t::j_string:
+ buf.read_be(data.index);
+ break;
+ case constant_type_t::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 constant_type_t::j_nameandtype:
+ buf.read_be(data.name_and_type.name_index);
+ buf.read_be(data.name_and_type.descriptor_index);
+ break;
+ default:
+ // invalid constant type!
+ throw new classfile_exception();
+ }
+ }
+ constant(int) {}
+
+ std::string toString()
+ {
+ std::ostringstream ss;
+ switch (type) {
+ case constant_type_t::j_hole:
+ ss << "Fake legacy entry";
+ break;
+ case constant_type_t::j_float:
+ ss << "Float: " << data.float_data;
+ break;
+ case constant_type_t::j_double:
+ ss << "Double: " << data.double_data;
+ break;
+ case constant_type_t::j_int:
+ ss << "Int: " << data.int_data;
+ break;
+ case constant_type_t::j_long:
+ ss << "Long: " << data.long_data;
+ break;
+ case constant_type_t::j_string_data:
+ ss << "StrData: " << str_data;
+ break;
+ case constant_type_t::j_string:
+ ss << "Str: " << data.index;
+ break;
+ case constant_type_t::j_fieldref:
+ ss << "FieldRef: " << data.ref_type.class_idx << " "
+ << data.ref_type.name_and_type_idx;
+ break;
+ case constant_type_t::j_methodref:
+ ss << "MethodRef: " << data.ref_type.class_idx << " "
+ << data.ref_type.name_and_type_idx;
+ break;
+ case constant_type_t::j_interface_methodref:
+ ss << "IfMethodRef: " << data.ref_type.class_idx << " "
+ << data.ref_type.name_and_type_idx;
+ break;
+ case constant_type_t::j_class:
+ ss << "Class: " << data.ref_type.class_idx;
+ break;
+ case constant_type_t::j_nameandtype:
+ ss << "NameAndType: " << data.name_and_type.name_index
+ << " " << data.name_and_type.descriptor_index;
+ break;
+ default:
+ ss << "Invalid entry (" << int(type) << ")";
+ 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;
+ ref_type_t ref_type;
+ name_and_type_t name_and_type;
+ } data = {0};
+ };
+
+ /**
+ * 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)
+ {
+ // FIXME: @SANITY this should check for the end of buffer.
+ uint16_t length = 0;
+ buf.read_be(length);
+ length--;
+ 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_type_t::j_double ||
+ last_constant->type == constant_type_t::j_long) {
+ // push in a fake constant to preserve indexing
+ constants.push_back(constant(0));
+ length -= 2;
+ } else {
+ length--;
+ }
+ }
+ }
+ 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;
+ };
+} // namespace java
diff --git a/meshmc/libraries/classparser/src/errors.h b/meshmc/libraries/classparser/src/errors.h
new file mode 100644
index 0000000000..95a6aee575
--- /dev/null
+++ b/meshmc/libraries/classparser/src/errors.h
@@ -0,0 +1,29 @@
+/* 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/>.
+ */
+
+#pragma once
+#include <exception>
+namespace java
+{
+ class classfile_exception : public std::exception
+ {
+ };
+} // namespace java
diff --git a/meshmc/libraries/classparser/src/javaendian.h b/meshmc/libraries/classparser/src/javaendian.h
new file mode 100644
index 0000000000..693df89964
--- /dev/null
+++ b/meshmc/libraries/classparser/src/javaendian.h
@@ -0,0 +1,84 @@
+/* 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/>.
+ */
+
+#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;
+ }
+
+#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);
+ }
+
+#endif
+
+ inline int64_t bigswap(int64_t x)
+ {
+ return static_cast<int64_t>(bigswap(static_cast<uint64_t>(x)));
+ }
+
+ inline int32_t bigswap(int32_t x)
+ {
+ return static_cast<int32_t>(bigswap(static_cast<uint32_t>(x)));
+ }
+
+ inline int16_t bigswap(int16_t x)
+ {
+ return static_cast<int16_t>(bigswap(static_cast<uint16_t>(x)));
+ }
+} // namespace util
diff --git a/meshmc/libraries/classparser/src/membuffer.h b/meshmc/libraries/classparser/src/membuffer.h
new file mode 100644
index 0000000000..bbfc1c3984
--- /dev/null
+++ b/meshmc/libraries/classparser/src/membuffer.h
@@ -0,0 +1,84 @@
+/* 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/>.
+ */
+
+#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;
+ };
+} // namespace util
generated by cgit 0.0.5-2-1-g0f52 (git 2.46.0) at 2026-04-05 17:58:36 +0000