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build: Move subproject to root project
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package app.revanced.patcher.patch.usage
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import app.revanced.patcher.data.BytecodeContext
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import app.revanced.patcher.extensions.InstructionExtensions.addInstructionsWithLabels
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import app.revanced.patcher.extensions.InstructionExtensions.getInstruction
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import app.revanced.patcher.extensions.InstructionExtensions.replaceInstruction
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import app.revanced.patcher.extensions.or
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import app.revanced.patcher.patch.BytecodePatch
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import app.revanced.patcher.patch.PatchException
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import app.revanced.patcher.patch.annotation.CompatiblePackage
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import app.revanced.patcher.patch.annotation.Patch
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import app.revanced.patcher.util.proxy.mutableTypes.MutableField.Companion.toMutable
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import app.revanced.patcher.util.proxy.mutableTypes.MutableMethod
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import app.revanced.patcher.util.proxy.mutableTypes.MutableMethod.Companion.toMutable
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import com.android.tools.smali.dexlib2.AccessFlags
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import com.android.tools.smali.dexlib2.Format
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import com.android.tools.smali.dexlib2.Opcode
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import com.android.tools.smali.dexlib2.builder.instruction.BuilderInstruction11x
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import com.android.tools.smali.dexlib2.builder.instruction.BuilderInstruction21c
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import com.android.tools.smali.dexlib2.iface.instruction.formats.Instruction21c
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import com.android.tools.smali.dexlib2.immutable.ImmutableField
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import com.android.tools.smali.dexlib2.immutable.ImmutableMethod
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import com.android.tools.smali.dexlib2.immutable.ImmutableMethodImplementation
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import com.android.tools.smali.dexlib2.immutable.reference.ImmutableFieldReference
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import com.android.tools.smali.dexlib2.immutable.reference.ImmutableStringReference
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import com.android.tools.smali.dexlib2.immutable.value.ImmutableFieldEncodedValue
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import com.android.tools.smali.dexlib2.util.Preconditions
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import com.google.common.collect.ImmutableList
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@Suppress("unused")
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@Patch(
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name = "Example bytecode patch",
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description = "Example demonstration of a bytecode patch.",
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dependencies = [ExampleResourcePatch::class],
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compatiblePackages = [CompatiblePackage("com.example.examplePackage", arrayOf("0.0.1", "0.0.2"))]
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)
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object ExampleBytecodePatch : BytecodePatch(setOf(ExampleFingerprint)) {
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// Entry point of a patch. Supplied fingerprints are resolved at this point.
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override fun execute(context: BytecodeContext) {
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ExampleFingerprint.result?.let { result ->
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// Let's modify it, so it prints "Hello, ReVanced! Editing bytecode."
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// Get the start index of our opcode pattern.
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// This will be the index of the instruction with the opcode CONST_STRING.
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val startIndex = result.scanResult.patternScanResult!!.startIndex
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result.mutableMethod.apply {
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replaceStringAt(startIndex, "Hello, ReVanced! Editing bytecode.")
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// Store the fields initial value into the first virtual register.
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replaceInstruction(0, "sget-object v0, LTestClass;->dummyField:Ljava/io/PrintStream;")
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// Now let's create a new call to our method and print the return value!
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// You can also use the smali compiler to create instructions.
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// For this sake of example I reuse the TestClass field dummyField inside the virtual register 0.
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//
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// Control flow instructions are not supported as of now.
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addInstructionsWithLabels(
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startIndex + 2,
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"""
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invoke-static { }, LTestClass;->returnHello()Ljava/lang/String;
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move-result-object v1
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invoke-virtual { v0, v1 }, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
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"""
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)
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}
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// Find the class in which the method matching our fingerprint is defined in.
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context.findClass(result.classDef.type)!!.mutableClass.apply {
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// Add a new method that returns a string.
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methods.add(
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ImmutableMethod(
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result.classDef.type,
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"returnHello",
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null,
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"Ljava/lang/String;",
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AccessFlags.PRIVATE or AccessFlags.STATIC,
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null,
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null,
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ImmutableMethodImplementation(
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1,
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ImmutableList.of(
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BuilderInstruction21c(
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Opcode.CONST_STRING,
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0,
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ImmutableStringReference("Hello, ReVanced! Adding bytecode.")
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),
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BuilderInstruction11x(Opcode.RETURN_OBJECT, 0)
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),
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null,
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null
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)
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).toMutable()
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)
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// Add a field in the main class.
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// We will use this field in our method below to call println on.
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// The field holds the Ljava/io/PrintStream->out; field.
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fields.add(
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ImmutableField(
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type,
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"dummyField",
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"Ljava/io/PrintStream;",
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AccessFlags.PRIVATE or AccessFlags.STATIC,
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ImmutableFieldEncodedValue(
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ImmutableFieldReference(
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"Ljava/lang/System;",
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"out",
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"Ljava/io/PrintStream;"
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)
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),
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null,
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null
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).toMutable()
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)
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}
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} ?: throw PatchException("Fingerprint failed to resolve.")
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}
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/**
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* Replace an existing instruction with a new one containing a reference to a new string.
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* @param index The index of the instruction to replace.
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* @param string The replacement string.
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*/
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private fun MutableMethod.replaceStringAt(index: Int, string: String) {
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val instruction = getInstruction(index)
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// Utility method of dexlib2.
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Preconditions.checkFormat(instruction.opcode, Format.Format21c)
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// Cast this to an instruction of the format 21c.
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// The instruction format can be found in the docs at
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// https://source.android.com/devices/tech/dalvik/dalvik-bytecode
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val strInstruction = instruction as Instruction21c
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// In our case we want an instruction with the opcode CONST_STRING
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// The format is 21c, so we create a new BuilderInstruction21c
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// This instruction will hold the string reference constant in the virtual register of the original instruction
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// For that a reference to the string is needed. It can be created with an ImmutableStringReference.
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// At last, use the method replaceInstruction to replace it at the given index startIndex.
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replaceInstruction(
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index,
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"const-string ${strInstruction.registerA}, ${ImmutableStringReference(string)}"
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)
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}
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}
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