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/* 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
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