Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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99 lines
3.4 KiB
99 lines
3.4 KiB
package dev.openrs2.deob.transform
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import dev.openrs2.asm.ClassVersionUtils
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import dev.openrs2.asm.MemberRef
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import dev.openrs2.asm.classpath.ClassPath
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import dev.openrs2.asm.classpath.Library
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import dev.openrs2.asm.transform.Transformer
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import dev.openrs2.deob.remap.TypedRemapper
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import org.objectweb.asm.Opcodes
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import org.objectweb.asm.tree.ClassNode
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import org.objectweb.asm.tree.FieldInsnNode
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import org.objectweb.asm.tree.MethodInsnNode
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import org.objectweb.asm.tree.MethodNode
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class StaticScramblingTransformer : Transformer() {
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private val fields = mutableMapOf<MemberRef, String>()
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private val methods = mutableMapOf<MemberRef, String>()
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private var nextStaticClass: ClassNode? = null
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private val staticClasses = mutableListOf<ClassNode>()
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private fun nextClass(): ClassNode {
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var clazz = nextStaticClass
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if (clazz != null && (clazz.fields.size + clazz.methods.size) < MAX_FIELDS_AND_METHODS) {
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return clazz
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}
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clazz = ClassNode()
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clazz.version = Opcodes.V1_1
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clazz.access = Opcodes.ACC_PUBLIC or Opcodes.ACC_SUPER
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clazz.name = "Static${staticClasses.size + 1}"
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clazz.superName = "java/lang/Object"
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clazz.interfaces = mutableListOf()
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clazz.innerClasses = mutableListOf()
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clazz.fields = mutableListOf()
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clazz.methods = mutableListOf()
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staticClasses += clazz
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nextStaticClass = clazz
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return clazz
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}
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override fun preTransform(classPath: ClassPath) {
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fields.clear()
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methods.clear()
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nextStaticClass = null
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staticClasses.clear()
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for (library in classPath.libraries) {
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// TODO(gpe): improve detection of the client library
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if ("client" !in library) {
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continue
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}
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for (clazz in library) {
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// TODO(gpe): exclude the JSObject class
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if (clazz.name in TypedRemapper.EXCLUDED_CLASSES) {
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continue
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}
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clazz.methods.removeIf { method ->
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if (method.access and Opcodes.ACC_STATIC == 0) {
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return@removeIf false
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} else if (method.access and Opcodes.ACC_NATIVE != 0) {
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return@removeIf false
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} else if (method.name in TypedRemapper.EXCLUDED_METHODS) {
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return@removeIf false
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}
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val staticClass = nextClass()
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staticClass.methods.add(method)
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staticClass.version = ClassVersionUtils.maxVersion(staticClass.version, clazz.version)
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methods[MemberRef(clazz, method)] = staticClass.name
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return@removeIf true
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}
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}
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for (clazz in staticClasses) {
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library.add(clazz)
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}
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}
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}
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override fun transformCode(classPath: ClassPath, library: Library, clazz: ClassNode, method: MethodNode): Boolean {
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for (insn in method.instructions) {
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when (insn) {
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is FieldInsnNode -> insn.owner = fields.getOrDefault(MemberRef(insn), insn.owner)
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is MethodInsnNode -> insn.owner = methods.getOrDefault(MemberRef(insn), insn.owner)
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}
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}
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return false
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}
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companion object {
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private const val MAX_FIELDS_AND_METHODS = 500
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}
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}
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