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SignatureResolver.kt
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SignatureResolver.kt
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package app.revanced.patcher.signature.resolver
import app.revanced.patcher.cache.MethodMap
import app.revanced.patcher.proxy.ClassProxy
import app.revanced.patcher.signature.MethodSignature
import app.revanced.patcher.signature.PatternScanResult
import app.revanced.patcher.signature.SignatureResolverResult
import org.jf.dexlib2.Opcode
import org.jf.dexlib2.iface.ClassDef
import org.jf.dexlib2.iface.Method
import org.jf.dexlib2.iface.instruction.Instruction
// TODO: add logger back
internal class SignatureResolver(
private val classes: Set<ClassDef>,
private val methodSignatures: Array<MethodSignature>
) {
fun resolve(): MethodMap {
val methodMap = MethodMap()
for ((index, classDef) in classes.withIndex()) {
for (signature in methodSignatures) {
if (methodMap.containsKey(signature.name)) {
continue
}
for (method in classDef.methods) {
val patternScanData = compareSignatureToMethod(signature, method) ?: continue
// create class proxy, in case a patch needs mutability
val classProxy = ClassProxy(classDef, index)
methodMap[signature.name] = SignatureResolverResult(
classProxy,
patternScanData,
method.name,
)
}
}
}
return methodMap
}
// These functions do not require the constructor values, so they can be static.
companion object {
fun resolveFromProxy(classProxy: ClassProxy, signature: MethodSignature): SignatureResolverResult? {
for (method in classProxy.immutableClass.methods) {
val result = compareSignatureToMethod(signature, method) ?: continue
return SignatureResolverResult(
classProxy,
result,
method.name,
)
}
return null
}
private fun compareSignatureToMethod(
signature: MethodSignature,
method: Method
): PatternScanResult? {
signature.returnType?.let { _ ->
if (!method.returnType.startsWith(signature.returnType)) return@compareSignatureToMethod null
}
signature.accessFlags?.let { _ ->
if (signature.accessFlags != method.accessFlags) {
return@compareSignatureToMethod null
}
}
signature.methodParameters?.let { _ ->
if (signature.methodParameters.count() != method.parameterTypes.count() || !signature.methodParameters.all { signatureMethodParameter ->
method.parameterTypes.any { methodParameter ->
methodParameter.startsWith(signatureMethodParameter)
}
}) {
return@compareSignatureToMethod null
}
}
return if (signature.opcodes == null) null
else method.implementation?.instructions?.scanFor(signature.opcodes)!!
}
}
}
private operator fun ClassDef.component1() = this
private operator fun ClassDef.component2() = this.methods
private fun MutableIterable<Instruction>.scanFor(pattern: Array<Opcode>): PatternScanResult? {
val count = this.count()
for (instructionIndex in 0 until count) {
var patternIndex = 0
while (instructionIndex + patternIndex < count) {
if (this.elementAt(instructionIndex + patternIndex).opcode != pattern[patternIndex]) break
if (++patternIndex < pattern.size) continue
return PatternScanResult(instructionIndex, instructionIndex + patternIndex)
}
}
return null
}