diff --git a/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt b/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt index a0549280..a7ff6e02 100644 --- a/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt +++ b/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt @@ -25,6 +25,7 @@ import dev.openrs2.deob.transform.OriginalNameTransformer import dev.openrs2.deob.transform.OverrideTransformer import dev.openrs2.deob.transform.RemapTransformer import dev.openrs2.deob.transform.ResetTransformer +import dev.openrs2.deob.transform.StaticScramblingTransformer import dev.openrs2.deob.transform.UnusedArgTransformer import dev.openrs2.deob.transform.VisibilityTransformer import java.nio.file.Files @@ -166,6 +167,7 @@ class Deobfuscator(private val input: Path, private val output: Path) { FinalTransformer(), ClassLiteralTransformer(), InvokeSpecialTransformer(), + StaticScramblingTransformer(), VisibilityTransformer(), OverrideTransformer() ) diff --git a/deob/src/main/java/dev/openrs2/deob/transform/StaticScramblingTransformer.kt b/deob/src/main/java/dev/openrs2/deob/transform/StaticScramblingTransformer.kt new file mode 100644 index 00000000..fc0b7d0a --- /dev/null +++ b/deob/src/main/java/dev/openrs2/deob/transform/StaticScramblingTransformer.kt @@ -0,0 +1,99 @@ +package dev.openrs2.deob.transform + +import dev.openrs2.asm.ClassVersionUtils +import dev.openrs2.asm.MemberRef +import dev.openrs2.asm.classpath.ClassPath +import dev.openrs2.asm.classpath.Library +import dev.openrs2.asm.transform.Transformer +import dev.openrs2.deob.remap.TypedRemapper +import org.objectweb.asm.Opcodes +import org.objectweb.asm.tree.ClassNode +import org.objectweb.asm.tree.FieldInsnNode +import org.objectweb.asm.tree.MethodInsnNode +import org.objectweb.asm.tree.MethodNode + +class StaticScramblingTransformer : Transformer() { + private val fields = mutableMapOf() + private val methods = mutableMapOf() + private var nextStaticClass: ClassNode? = null + private val staticClasses = mutableListOf() + + private fun nextClass(): ClassNode { + var clazz = nextStaticClass + if (clazz != null && (clazz.fields.size + clazz.methods.size) < MAX_FIELDS_AND_METHODS) { + return clazz + } + + clazz = ClassNode() + clazz.version = Opcodes.V1_1 + clazz.access = Opcodes.ACC_PUBLIC or Opcodes.ACC_SUPER + clazz.name = "Static${staticClasses.size + 1}" + clazz.superName = "java/lang/Object" + clazz.interfaces = mutableListOf() + clazz.innerClasses = mutableListOf() + clazz.fields = mutableListOf() + clazz.methods = mutableListOf() + + staticClasses += clazz + nextStaticClass = clazz + + return clazz + } + + override fun preTransform(classPath: ClassPath) { + fields.clear() + methods.clear() + nextStaticClass = null + staticClasses.clear() + + for (library in classPath.libraries) { + // TODO(gpe): improve detection of the client library + if ("client" !in library) { + continue + } + + for (clazz in library) { + // TODO(gpe): exclude the JSObject class + if (clazz.name in TypedRemapper.EXCLUDED_CLASSES) { + continue + } + + clazz.methods.removeIf { method -> + if (method.access and Opcodes.ACC_STATIC == 0) { + return@removeIf false + } else if (method.access and Opcodes.ACC_NATIVE != 0) { + return@removeIf false + } else if (method.name in TypedRemapper.EXCLUDED_METHODS) { + return@removeIf false + } + + val staticClass = nextClass() + staticClass.methods.add(method) + staticClass.version = ClassVersionUtils.maxVersion(staticClass.version, clazz.version) + + methods[MemberRef(clazz, method)] = staticClass.name + return@removeIf true + } + } + + for (clazz in staticClasses) { + library.add(clazz) + } + } + } + + override fun transformCode(classPath: ClassPath, library: Library, clazz: ClassNode, method: MethodNode): Boolean { + for (insn in method.instructions) { + when (insn) { + is FieldInsnNode -> insn.owner = fields.getOrDefault(MemberRef(insn), insn.owner) + is MethodInsnNode -> insn.owner = methods.getOrDefault(MemberRef(insn), insn.owner) + } + } + + return false + } + + companion object { + private const val MAX_FIELDS_AND_METHODS = 500 + } +}