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PatcherTest.kt
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PatcherTest.kt
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package app.revanced.patcher
import app.revanced.patcher.cache.Cache
import app.revanced.patcher.extensions.AccessFlagExtensions.Companion.or
import app.revanced.patcher.extensions.addInstructions
import app.revanced.patcher.patch.Patch
import app.revanced.patcher.patch.PatchResult
import app.revanced.patcher.patch.PatchResultSuccess
import app.revanced.patcher.proxy.mutableTypes.MutableField.Companion.toMutable
import app.revanced.patcher.proxy.mutableTypes.MutableMethod.Companion.toMutable
import app.revanced.patcher.signature.*
import app.revanced.patcher.smali.asInstruction
import app.revanced.patcher.smali.asInstructions
import com.google.common.collect.ImmutableList
import org.jf.dexlib2.AccessFlags
import org.jf.dexlib2.Opcode
import org.jf.dexlib2.builder.instruction.BuilderInstruction11x
import org.jf.dexlib2.builder.instruction.BuilderInstruction21c
import org.jf.dexlib2.immutable.ImmutableField
import org.jf.dexlib2.immutable.ImmutableMethod
import org.jf.dexlib2.immutable.ImmutableMethodImplementation
import org.jf.dexlib2.immutable.reference.ImmutableFieldReference
import org.jf.dexlib2.immutable.reference.ImmutableStringReference
import org.jf.dexlib2.immutable.value.ImmutableFieldEncodedValue
import org.junit.jupiter.api.Test
import java.io.File
import kotlin.test.assertTrue
internal class PatcherTest {
companion object {
val testSignatures = listOf(
MethodSignature(
"main-method",
SignatureMetadata(
method = MethodMetadata(
definingClass = "TestClass",
methodName = "main",
comment = "Main method of TestClass. Version 1.0.0"
),
patcher = PatcherMetadata(
method = ResolverMethod.Fuzzy(2)
)
),
"V",
AccessFlags.PUBLIC or AccessFlags.STATIC or AccessFlags.STATIC,
listOf("[L"),
listOf(
Opcode.CONST_STRING,
Opcode.INVOKE_STATIC, // This is intentionally wrong to test the Fuzzy resolver.
Opcode.RETURN_VOID
)
)
)
}
@Test
fun testPatcher() {
val patcher = Patcher(
File(PatcherTest::class.java.getResource("/test1.dex")!!.toURI()),
testSignatures
)
patcher.addPatches(listOf(
object : Patch("TestPatch") {
override fun execute(cache: Cache): PatchResult {
// Get the result from the resolver cache
val result = cache.methodMap["main-method"]
// Get the implementation for the resolved method
val implementation = result.method.implementation!!
// Let's modify it, so it prints "Hello, ReVanced! Editing bytecode."
// Get the start index of our opcode pattern.
// This will be the index of the instruction with the opcode CONST_STRING.
val startIndex = result.scanData.startIndex
// Replace the instruction at index startIndex with a new instruction.
// The instruction format can be found in the docs at
// https://source.android.com/devices/tech/dalvik/dalvik-bytecode
//
// In our case we want an instruction with the opcode CONST_STRING
// and the string "Hello, ReVanced! Adding bytecode.".
// The format is 21c, so we create a new BuilderInstruction21c
// This instruction will hold the string reference constant in the virtual register 1.
// For that a reference to the string is needed. It can be created with an ImmutableStringReference.
// At last, use the method replaceInstruction to replace it at the given index startIndex.
implementation.replaceInstruction(
startIndex,
BuilderInstruction21c(
Opcode.CONST_STRING,
1,
ImmutableStringReference("Hello, ReVanced! Editing bytecode.")
)
)
// Get the class in which the method matching our signature is defined in.
val mainClass = cache.findClass {
it.type == result.definingClassProxy.immutableClass.type
}!!.resolve()
// Add a new method returning a string
mainClass.methods.add(
ImmutableMethod(
result.definingClassProxy.immutableClass.type,
"returnHello",
null,
"Ljava/lang/String;",
AccessFlags.PRIVATE or AccessFlags.STATIC,
null,
null,
ImmutableMethodImplementation(
1,
ImmutableList.of(
BuilderInstruction21c(
Opcode.CONST_STRING,
0,
ImmutableStringReference("Hello, ReVanced! Adding bytecode.")
),
BuilderInstruction11x(Opcode.RETURN_OBJECT, 0)
),
null,
null
)
).toMutable()
)
// Add a field in the main class
// We will use this field in our method below to call println on
// The field holds the Ljava/io/PrintStream->out; field
mainClass.fields.add(
ImmutableField(
mainClass.type,
"dummyField",
"Ljava/io/PrintStream;",
AccessFlags.PRIVATE or AccessFlags.STATIC,
ImmutableFieldEncodedValue(
ImmutableFieldReference(
"Ljava/lang/System;",
"out",
"Ljava/io/PrintStream;"
)
),
null,
null
).toMutable()
)
// store the fields initial value into the first virtual register
implementation.replaceInstruction(
0,
"sget-object v0, LTestClass;->dummyField:Ljava/io/PrintStream;".asInstruction()
)
// Now let's create a new call to our method and print the return value!
// You can also use the smali compiler to create instructions.
// For this sake of example I reuse the TestClass field dummyField inside the virtual register 0.
//
// Control flow instructions are not supported as of now.
val instructions = """
invoke-static { }, LTestClass;->returnHello()Ljava/lang/String;
move-result-object v1
invoke-virtual { v0, v1 }, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
""".trimIndent().asInstructions()
implementation.addInstructions(startIndex + 2, instructions)
// Finally, tell the patcher that this patch was a success.
// You can also return PatchResultError with a message.
// If an exception is thrown inside this function,
// a PatchResultError will be returned with the error message.
return PatchResultSuccess()
}
}
))
// Apply all patches loaded in the patcher
val patchResult = patcher.applyPatches()
// You can check if an error occurred
for ((patchName, result) in patchResult) {
if (result.isFailure) {
throw Exception("Patch $patchName failed", result.exceptionOrNull()!!)
}
}
val out = patcher.save()
assertTrue(out.isNotEmpty(), "Expected the output of Patcher#save() to not be empty.")
}
}