refactor: migrate signature schema changes to Patcher

also updated Extensions, for good measure.

src/main/kotlin/app/revanced/patcher/extensions/Extensions.kt

@@ -4,7 +4,12 @@ import org.jf.dexlib2.AccessFlags
 import org.jf.dexlib2.builder.BuilderInstruction
 import org.jf.dexlib2.builder.MutableMethodImplementation
 
+class AccessFlagExtensions {
+    companion object {
         infix fun AccessFlags.or(other: AccessFlags) = this.value or other.value
+        infix fun Int.or(other: AccessFlags) = this or other.value
+    }
+}
 
 fun MutableMethodImplementation.addInstructions(index: Int, instructions: List<BuilderInstruction>) {
     for (i in instructions.lastIndex downTo 0) {

src/main/kotlin/app/revanced/patcher/signature/MethodSignature.kt

@@ -5,16 +5,61 @@ import org.jf.dexlib2.Opcode
 /**
  * Represents a method signature.
  * @param name A suggestive name for the method which the signature was created for.
+ * @param metadata Metadata about this signature.
  * @param returnType The return type of the method.
+ * @param accessFlags The access flags of the method.
  * @param methodParameters The parameters of the method.
  * @param opcodes A list of opcodes of the method.
- * @param accessFlags The access flags of the method.
  */
 @Suppress("ArrayInDataClass")
 data class MethodSignature(
     val name: String,
+    val metadata: SignatureMetadata,
     val returnType: String?,
     val accessFlags: Int?,
     val methodParameters: Iterable<String>?,
     val opcodes: Iterable<Opcode>?
 )
+
+/**
+ * Metadata about the signature.
+ * @param method Metadata about the method for this signature.
+ * @param patcher Metadata for the Patcher, this contains things like how the Patcher should interpret this signature.
+ */
+data class SignatureMetadata(
+    val method: MethodMetadata,
+    val patcher: PatcherMetadata
+)
+
+/**
+ * Metadata about the method for this signature.
+ * @param definingClass The defining class name of the original method.
+ * @param methodName The name of the original method.
+ * @param comment A comment about this method and the data above.
+ * For example, the version this signature was originally made for.
+ */
+data class MethodMetadata(
+    val definingClass: String?,
+    val methodName: String?,
+    val comment: String
+)
+
+/**
+ * Metadata for the Patcher, this contains things like how the Patcher should interpret this signature.
+ * @param method The method the Patcher should use to resolve the signature.
+ */
+data class PatcherMetadata(
+    val method: PatcherMethod
+)
+
+interface PatcherMethod {
+    /**
+     * When comparing the signature, if one or more of the opcodes do not match, skip.
+     */
+    class Direct : PatcherMethod
+
+    /**
+     * When comparing the signature, if [threshold] or more of the opcodes do not match, skip.
+     */
+    class Fuzzy(val threshold: Int) : PatcherMethod
+}

src/test/kotlin/app/revanced/patcher/PatcherTest.kt

@@ -1,14 +1,14 @@
 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.extensions.or
 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.MethodSignature
+import app.revanced.patcher.signature.*
 import app.revanced.patcher.smali.asInstruction
 import app.revanced.patcher.smali.asInstructions
 import com.google.common.collect.ImmutableList
@@ -31,8 +31,18 @@ internal class PatcherTest {
         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 = PatcherMethod.Fuzzy(2)
+                    )
+                ),
                 "V",
-                AccessFlags.PUBLIC or AccessFlags.STATIC,
+                AccessFlags.PUBLIC or AccessFlags.STATIC or AccessFlags.STATIC,
                 listOf("[L"),
                 listOf(
                     Opcode.CONST_STRING,