chore(release): 6.0.0 [skip ci]

# [6.0.0](https://github.com/revanced/revanced-patcher/compare/v5.1.2...v6.0.0) (2022-10-05)

### Code Refactoring

* improve structuring of classes and their implementations ([4aa14bb](4aa14bbb85))

### Features

* remove unused annotation `DirectPatternScanMethod` ([538b2a8](538b2a8599))
* remove unused annotation `SincePatcher` ([4ae9ad0](4ae9ad09d6))
* remove unused extension `dependsOn` ([797286b](797286b758))
* remove unused patch extensions ([5583904](5583904994))

### BREAKING CHANGES

* various changes in which packages classes previously where and their implementation
* These extensions do not exist anymore and any use should be removed
* The extension does not exist anymore and any use should be removed
* The annotation does not exist anymore and any use should be removed

.github/ISSUE_TEMPLATE/bug-issue.yml

@@ -58,3 +58,15 @@ body:
       description: Add additional context here.
     validations:
       required: false
+  - type: checkboxes
+    id: acknowledgements
+    attributes:
+      label: Acknowledgements
+      description: Your issue will be closed if you haven't done these steps.
+      options:
+        - label: I have searched the existing issues and this is a new and no duplicate or related to another open issue.
+          required: true
+        - label: I have written a short but informative title.
+          required: true
+        - label: I filled out all of the requested information in this issue properly.
+          required: true

.github/ISSUE_TEMPLATE/feature-issue.yml

@@ -43,4 +43,16 @@ body:
       label: Additional context
       description: Add additional context here.
     validations:
-      required: false
+      required: false
+  - type: checkboxes
+    id: acknowledgements
+    attributes:
+      label: Acknowledgements
+      description: Your issue will be closed if you haven't done these steps.
+      options:
+        - label: I have searched the existing issues and this is a new and no duplicate or related to another open issue.
+          required: true
+        - label: I have written a short but informative title.
+          required: true
+        - label: I filled out all of the requested information in this issue properly.
+          required: true

.idea/.gitignore

@@ -6,3 +6,4 @@
 # Datasource local storage ignored files
 /dataSources/
 /dataSources.local.xml
+/kotlinc.xml

build.gradle.kts

@@ -24,8 +24,9 @@ dependencies {
     implementation("xpp3:xpp3:1.1.4c")
     implementation("org.smali:smali:2.5.2")
     implementation("app.revanced:multidexlib2:2.5.2.r2")
-    implementation("org.apktool:apktool-lib:2.7.0-SNAPSHOT")
+    implementation("org.apktool:apktool-lib:2.8.1-SNAPSHOT")
 
+    implementation(kotlin("reflect"))
     testImplementation(kotlin("test"))
 }
 
@@ -36,6 +37,9 @@ tasks {
             events("PASSED", "SKIPPED", "FAILED")
         }
     }
+    processResources {
+        expand("projectVersion" to project.version)
+    }
 }
 
 java {

gradle.properties

@@ -1,2 +1,2 @@
 kotlin.code.style = official
-version = 3.2.0
+version = 6.0.0

src/main/kotlin/app/revanced/patcher/PatcherContext.kt

@@ -0,0 +1,19 @@
+package app.revanced.patcher
+
+import app.revanced.patcher.data.BytecodeContext
+import app.revanced.patcher.data.Context
+import app.revanced.patcher.data.PackageMetadata
+import app.revanced.patcher.data.ResourceContext
+import app.revanced.patcher.patch.Patch
+import org.jf.dexlib2.iface.ClassDef
+import java.io.File
+
+data class PatcherContext(
+    val classes: MutableList<ClassDef>,
+    val resourceCacheDirectory: File,
+) {
+    val packageMetadata = PackageMetadata()
+    internal val patches = mutableListOf<Class<out Patch<Context>>>()
+    internal val bytecodeContext = BytecodeContext(classes)
+    internal val resourceContext = ResourceContext(resourceCacheDirectory)
+}

src/main/kotlin/app/revanced/patcher/PatcherData.kt

@@ -1,19 +0,0 @@
-package app.revanced.patcher
-
-import app.revanced.patcher.data.Data
-import app.revanced.patcher.data.PackageMetadata
-import app.revanced.patcher.data.impl.BytecodeData
-import app.revanced.patcher.data.impl.ResourceData
-import app.revanced.patcher.patch.Patch
-import org.jf.dexlib2.iface.ClassDef
-import java.io.File
-
-data class PatcherData(
-    internal val internalClasses: MutableList<ClassDef>,
-    internal val resourceCacheDirectory: String,
-    val packageMetadata: PackageMetadata
-) {
-    internal val patches = mutableListOf<Class<out Patch<Data>>>()
-    internal val bytecodeData = BytecodeData(internalClasses)
-    internal val resourceData = ResourceData(File(resourceCacheDirectory))
-}

src/main/kotlin/app/revanced/patcher/PatcherOptions.kt

@@ -8,7 +8,6 @@ import java.io.File
  * Options for the [Patcher].
  * @param inputFile The input file (usually an apk file).
  * @param resourceCacheDirectory Directory to cache resources.
- * @param patchResources Weather to use the resource patcher. Resources will still need to be decoded.
  * @param aaptPath Optional path to a custom aapt binary.
  * @param frameworkFolderLocation Optional path to a custom framework folder.
  * @param logger Custom logger implementation for the [Patcher].
@@ -16,7 +15,6 @@ import java.io.File
 data class PatcherOptions(
     internal val inputFile: File,
     internal val resourceCacheDirectory: String,
-    internal val patchResources: Boolean = false,
     internal val aaptPath: String = "",
     internal val frameworkFolderLocation: String? = null,
     internal val logger: Logger = NopLogger

src/main/kotlin/app/revanced/patcher/annotation/CompatibilityAnnotation.kt

@@ -24,5 +24,5 @@ annotation class Compatibility(
 @MustBeDocumented
 annotation class Package(
     val name: String,
-    val versions: Array<String>
-)
+    val versions: Array<String> = [],
+)

src/main/kotlin/app/revanced/patcher/annotation/Deprecated.kt

@@ -0,0 +1,19 @@
+package app.revanced.patcher.annotation
+
+import app.revanced.patcher.data.Context
+import app.revanced.patcher.patch.Patch
+import kotlin.reflect.KClass
+
+/**
+ * Declares a [Patch] deprecated for removal.
+ * @param reason The reason why the patch is deprecated.
+ * @param replacement The replacement for the deprecated patch, if any.
+ */
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+@MustBeDocumented
+annotation class PatchDeprecated(
+    val reason: String,
+    val replacement: KClass<out Patch<Context>> = Patch::class
+    // Values cannot be nullable in annotations, so this will have to do.
+)

src/main/kotlin/app/revanced/patcher/data/Context.kt

@@ -0,0 +1,181 @@
+package app.revanced.patcher.data
+
+import app.revanced.patcher.util.ProxyBackedClassList
+import app.revanced.patcher.util.method.MethodWalker
+import org.jf.dexlib2.iface.ClassDef
+import org.jf.dexlib2.iface.Method
+import org.w3c.dom.Document
+import java.io.Closeable
+import java.io.File
+import java.io.InputStream
+import java.io.OutputStream
+import javax.xml.parsers.DocumentBuilderFactory
+import javax.xml.transform.TransformerFactory
+import javax.xml.transform.dom.DOMSource
+import javax.xml.transform.stream.StreamResult
+
+/**
+ * A common interface to constrain [Context] to [BytecodeContext] and [ResourceContext].
+ */
+
+sealed interface Context
+
+class BytecodeContext internal constructor(classes: MutableList<ClassDef>) : Context {
+    /**
+     * The list of classes.
+     */
+    val classes = ProxyBackedClassList(classes)
+
+    /**
+     * Find a class by a given class name.
+     *
+     * @param className The name of the class.
+     * @return A proxy for the first class that matches the class name.
+     */
+    fun findClass(className: String) = findClass { it.type.contains(className) }
+
+    /**
+     * Find a class by a given predicate.
+     *
+     * @param predicate A predicate to match the class.
+     * @return A proxy for the first class that matches the predicate.
+     */
+    fun findClass(predicate: (ClassDef) -> Boolean) =
+        // if we already proxied the class matching the predicate...
+        classes.proxies.firstOrNull { predicate(it.immutableClass) } ?:
+        // else resolve the class to a proxy and return it, if the predicate is matching a class
+        classes.find(predicate)?.let { proxy(it) }
+
+    fun proxy(classDef: ClassDef): app.revanced.patcher.util.proxy.ClassProxy {
+        var proxy = this.classes.proxies.find { it.immutableClass.type == classDef.type }
+        if (proxy == null) {
+            proxy = app.revanced.patcher.util.proxy.ClassProxy(classDef)
+            this.classes.add(proxy)
+        }
+        return proxy
+    }
+
+    private companion object {
+        inline fun <reified T> Iterable<T>.find(predicate: (T) -> Boolean): T? {
+            for (element in this) {
+                if (predicate(element)) {
+                    return element
+                }
+            }
+            return null
+        }
+    }
+}
+
+/**
+ * Create a [MethodWalker] instance for the current [BytecodeContext].
+ *
+ * @param startMethod The method to start at.
+ * @return A [MethodWalker] instance.
+ */
+fun BytecodeContext.toMethodWalker(startMethod: Method): MethodWalker {
+    return MethodWalker(this, startMethod)
+}
+
+internal inline fun <T> Iterable<T>.findIndexed(predicate: (T) -> Boolean): Pair<T, Int>? {
+    for ((index, element) in this.withIndex()) {
+        if (predicate(element)) {
+            return element to index
+        }
+    }
+    return null
+}
+
+class ResourceContext internal constructor(private val resourceCacheDirectory: File) : Context, Iterable<File> {
+    val xmlEditor = XmlFileHolder()
+
+    operator fun get(path: String) = resourceCacheDirectory.resolve(path)
+
+    override fun iterator() = resourceCacheDirectory.walkTopDown().iterator()
+
+    inner class XmlFileHolder {
+        operator fun get(inputStream: InputStream) =
+            DomFileEditor(inputStream)
+
+        operator fun get(path: String): DomFileEditor {
+            return DomFileEditor(this@ResourceContext[path])
+        }
+
+    }
+}
+
+/**
+ * Wrapper for a file that can be edited as a dom document.
+ *
+ * This constructor does not check for locks to the file when writing.
+ * Use the secondary constructor.
+ *
+ * @param inputStream the input stream to read the xml file from.
+ * @param outputStream the output stream to write the xml file to. If null, the file will be read only.
+ *
+ */
+class DomFileEditor internal constructor(
+    private val inputStream: InputStream,
+    private val outputStream: Lazy<OutputStream>? = null,
+) : Closeable {
+    // path to the xml file to unlock the resource when closing the editor
+    private var filePath: String? = null
+    private var closed: Boolean = false
+
+    /**
+     * The document of the xml file
+     */
+    val file: Document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(inputStream)
+        .also(Document::normalize)
+
+
+    // lazily open an output stream
+    // this is required because when constructing a DomFileEditor the output stream is created along with the input stream, which is not allowed
+    // the workaround is to lazily create the output stream. This way it would be used after the input stream is closed, which happens in the constructor
+    constructor(file: File) : this(file.inputStream(), lazy { file.outputStream() }) {
+        // increase the lock
+        locks.merge(file.path, 1, Integer::sum)
+        filePath = file.path
+    }
+
+    /**
+     * Closes the editor. Write backs and decreases the lock count.
+     *
+     * Will not write back to the file if the file is still locked.
+     */
+    override fun close() {
+        if (closed) return
+
+        inputStream.close()
+
+        // if the output stream is not null, do not close it
+        outputStream?.let {
+            // prevent writing to same file, if it is being locked
+            // isLocked will be false if the editor was created through a stream
+            val isLocked = filePath?.let { path ->
+                val isLocked = locks[path]!! > 1
+                // decrease the lock count if the editor was opened for a file
+                locks.merge(path, -1, Integer::sum)
+                isLocked
+            } ?: false
+
+            // if unlocked, write back to the file
+            if (!isLocked) {
+                it.value.use { stream ->
+                    val result = StreamResult(stream)
+                    TransformerFactory.newInstance().newTransformer().transform(DOMSource(file), result)
+                }
+
+                it.value.close()
+                return
+            }
+        }
+
+        closed = true
+    }
+
+    private companion object {
+        // map of concurrent open files
+        val locks = mutableMapOf<String, Int>()
+    }
+}

src/main/kotlin/app/revanced/patcher/data/Data.kt

@@ -1,9 +0,0 @@
-package app.revanced.patcher.data
-
-import app.revanced.patcher.data.impl.BytecodeData
-import app.revanced.patcher.data.impl.ResourceData
-
-/**
- * Constraint interface for [BytecodeData] and [ResourceData]
- */
-interface Data

src/main/kotlin/app/revanced/patcher/data/impl/BytecodeData.kt

@@ -1,69 +0,0 @@
-package app.revanced.patcher.data.impl
-
-import app.revanced.patcher.data.Data
-import app.revanced.patcher.util.ProxyBackedClassList
-import app.revanced.patcher.util.method.MethodWalker
-import org.jf.dexlib2.iface.ClassDef
-import org.jf.dexlib2.iface.Method
-
-class BytecodeData(
-    internalClasses: MutableList<ClassDef>
-) : Data {
-    val classes = ProxyBackedClassList(internalClasses)
-
-    /**
-     * Find a class by a given class name.
-     * @param className The name of the class.
-     * @return A proxy for the first class that matches the class name.
-     */
-    fun findClass(className: String) = findClass { it.type.contains(className) }
-
-    /**
-     * Find a class by a given predicate.
-     * @param predicate A predicate to match the class.
-     * @return A proxy for the first class that matches the predicate.
-     */
-    fun findClass(predicate: (ClassDef) -> Boolean) =
-        // if we already proxied the class matching the predicate...
-        classes.proxies.firstOrNull { predicate(it.immutableClass) } ?:
-        // else resolve the class to a proxy and return it, if the predicate is matching a class
-        classes.find(predicate)?.let { proxy(it) }
-
-    fun proxy(classDef: ClassDef): app.revanced.patcher.util.proxy.ClassProxy {
-        var proxy = this.classes.proxies.find { it.immutableClass.type == classDef.type }
-        if (proxy == null) {
-            proxy = app.revanced.patcher.util.proxy.ClassProxy(classDef)
-            this.classes.add(proxy)
-        }
-        return proxy
-    }
-}
-
-internal class MethodNotFoundException(s: String) : Exception(s)
-
-internal inline fun <reified T> Iterable<T>.find(predicate: (T) -> Boolean): T? {
-    for (element in this) {
-        if (predicate(element)) {
-            return element
-        }
-    }
-    return null
-}
-
-/**
- * Create a [MethodWalker] instance for the current [BytecodeData].
- * @param startMethod The method to start at.
- * @return A [MethodWalker] instance.
- */
-fun BytecodeData.toMethodWalker(startMethod: Method): MethodWalker {
-    return MethodWalker(this, startMethod)
-}
-
-internal inline fun <T> Iterable<T>.findIndexed(predicate: (T) -> Boolean): Pair<T, Int>? {
-    for ((index, element) in this.withIndex()) {
-        if (predicate(element)) {
-            return element to index
-        }
-    }
-    return null
-}

src/main/kotlin/app/revanced/patcher/data/impl/ResourceData.kt

@@ -1,84 +0,0 @@
-package app.revanced.patcher.data.impl
-
-import app.revanced.patcher.data.Data
-import org.w3c.dom.Document
-import java.io.Closeable
-import java.io.File
-import java.io.InputStream
-import java.io.OutputStream
-import javax.xml.parsers.DocumentBuilderFactory
-import javax.xml.transform.TransformerFactory
-import javax.xml.transform.dom.DOMSource
-import javax.xml.transform.stream.StreamResult
-
-class ResourceData(private val resourceCacheDirectory: File) : Data, Iterable<File> {
-    val xmlEditor = XmlFileHolder()
-
-    operator fun get(path: String) = resourceCacheDirectory.resolve(path)
-
-    override fun iterator() = resourceCacheDirectory.walkTopDown().iterator()
-
-    inner class XmlFileHolder {
-        operator fun get(inputStream: InputStream) =
-            DomFileEditor(inputStream)
-
-        operator fun get(path: String): DomFileEditor {
-            return DomFileEditor(this@ResourceData[path])
-        }
-
-    }
-}
-
-/**
- * DomFileEditor is a wrapper for a file that can be edited as a dom document.
- *
- * @param inputStream the input stream to read the xml file from.
- * @param outputStream the output stream to write the xml file to. If null, the file will not be written.
- */
-class DomFileEditor internal constructor(
-    private val inputStream: InputStream,
-    private val outputStream: Lazy<OutputStream>? = null,
-) : Closeable {
-    // path to the xml file to unlock the resource when closing the editor
-    private var filePath: String? = null
-
-    /**
-     * The document of the xml file
-     */
-    val file: Document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(inputStream)
-        .also(Document::normalize)
-
-    // lazily open an output stream
-    // this is required because when constructing a DomFileEditor the output stream is created along with the input stream, which is not allowed
-    // the workaround is to lazily create the output stream. This way it would be used after the input stream is closed, which happens in the constructor
-    constructor(file: File) : this(file.inputStream(), lazy { file.outputStream() }) {
-        filePath = file.path
-
-        // prevent sharing mutability of the same file between multiple instances of DomFileEditor
-        if (locks.contains(filePath))
-            throw IllegalStateException("Can not create a DomFileEditor for that file because it is already locked by another instance of DomFileEditor.")
-        locks.add(filePath!!)
-    }
-
-    override fun close() {
-        inputStream.close()
-
-        // if the output stream is not null, do not close it
-        outputStream?.let {
-            val result = StreamResult(it.value)
-            TransformerFactory.newInstance().newTransformer().transform(DOMSource(file), result)
-
-            it.value.close()
-        }
-
-        // remove the lock, if it exists
-        filePath?.let {
-            locks.remove(it)
-        }
-    }
-
-    private companion object {
-        // list of locked file paths
-        val locks = mutableListOf<String>()
-    }
-}

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

@@ -1,23 +1,24 @@
 package app.revanced.patcher.extensions
 
-import app.revanced.patcher.annotation.Compatibility
-import app.revanced.patcher.annotation.Description
-import app.revanced.patcher.annotation.Name
-import app.revanced.patcher.annotation.Version
-import app.revanced.patcher.data.Data
+import app.revanced.patcher.annotation.*
+import app.revanced.patcher.data.Context
+import app.revanced.patcher.fingerprint.method.annotation.FuzzyPatternScanMethod
 import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
+import app.revanced.patcher.patch.OptionsContainer
 import app.revanced.patcher.patch.Patch
-import app.revanced.patcher.patch.annotations.Dependencies
-import app.revanced.patcher.patch.annotations.DependencyType
+import app.revanced.patcher.patch.PatchOptions
 import app.revanced.patcher.patch.annotations.DependsOn
 import kotlin.reflect.KClass
+import kotlin.reflect.KVisibility
+import kotlin.reflect.full.companionObject
+import kotlin.reflect.full.companionObjectInstance
 
 /**
  * Recursively find a given annotation on a class.
  * @param targetAnnotation The annotation to find.
  * @return The annotation.
  */
-private fun <T : Annotation> Class<*>.recursiveAnnotation(targetAnnotation: KClass<T>) =
+private fun <T : Annotation> Class<*>.findAnnotationRecursively(targetAnnotation: KClass<T>) =
     this.findAnnotationRecursively(targetAnnotation.java, mutableSetOf())
 
 
@@ -38,35 +39,54 @@ private fun <T : Annotation> Class<*>.findAnnotationRecursively(
     return null
 }
 
-private typealias PatchClass = Class<out Patch<Data>>
-
 object PatchExtensions {
-    val PatchClass.patchName: String get() = recursiveAnnotation(Name::class)?.name ?: this.javaClass.simpleName
-    val PatchClass.version get() = recursiveAnnotation(Version::class)?.version
-    val PatchClass.include get() = recursiveAnnotation(app.revanced.patcher.patch.annotations.Patch::class)!!.include
-    val PatchClass.description get() = recursiveAnnotation(Description::class)?.description
-    val PatchClass.dependencies get() = buildList {
-        recursiveAnnotation(DependsOn::class)?.let { add(PatchDependency(it.value, it.type)) }
-        recursiveAnnotation(Dependencies::class)?.dependencies?.forEach { add(PatchDependency(it, DependencyType.HARD)) }
-    }.toTypedArray()
-    val PatchClass.compatiblePackages get() = recursiveAnnotation(Compatibility::class)?.compatiblePackages
+    val Class<out Patch<Context>>.patchName: String
+        get() = findAnnotationRecursively(Name::class)?.name ?: this.javaClass.simpleName
 
-    @JvmStatic
-    fun PatchClass.dependsOn(patch: PatchClass): Boolean {
-        if (this.patchName == patch.patchName) throw IllegalArgumentException("thisval and patch may not be the same")
-        return this.dependencies.any { it.patch.java.patchName == this@dependsOn.patchName }
-    }
+    val Class<out Patch<Context>>.version
+        get() = findAnnotationRecursively(Version::class)?.version
 
-    class PatchDependency internal constructor(val patch: KClass<out Patch<Data>>, val type: DependencyType = DependencyType.HARD)
+    val Class<out Patch<Context>>.include
+        get() = findAnnotationRecursively(app.revanced.patcher.patch.annotations.Patch::class)!!.include
+
+    val Class<out Patch<Context>>.description
+        get() = findAnnotationRecursively(Description::class)?.description
+
+    val Class<out Patch<Context>>.dependencies
+        get() = findAnnotationRecursively(DependsOn::class)?.dependencies
+
+    val Class<out Patch<Context>>.compatiblePackages
+        get() = findAnnotationRecursively(Compatibility::class)?.compatiblePackages
+
+    val Class<out Patch<Context>>.options: PatchOptions?
+        get() = kotlin.companionObject?.let { cl ->
+            if (cl.visibility != KVisibility.PUBLIC) return null
+            kotlin.companionObjectInstance?.let {
+                (it as? OptionsContainer)?.options
+            }
+        }
+
+    val Class<out Patch<Context>>.deprecated: Pair<String, KClass<out Patch<Context>>?>?
+        get() = findAnnotationRecursively(PatchDeprecated::class)?.let {
+            it.reason to it.replacement.let { cl ->
+                if (cl == Patch::class) null else cl
+            }
+        }
 }
 
 object MethodFingerprintExtensions {
     val MethodFingerprint.name: String
-        get() = javaClass.recursiveAnnotation(Name::class)?.name ?: this.javaClass.simpleName
-    val MethodFingerprint.version get() = javaClass.recursiveAnnotation(Version::class)?.version ?: "0.0.1"
-    val MethodFingerprint.description get() = javaClass.recursiveAnnotation(Description::class)?.description
-    val MethodFingerprint.compatiblePackages get() = javaClass.recursiveAnnotation(Compatibility::class)?.compatiblePackages
-    val MethodFingerprint.matchingMethod get() = javaClass.recursiveAnnotation(app.revanced.patcher.fingerprint.method.annotation.MatchingMethod::class)
-    val MethodFingerprint.fuzzyPatternScanMethod get() = javaClass.recursiveAnnotation(app.revanced.patcher.fingerprint.method.annotation.FuzzyPatternScanMethod::class)
-    val MethodFingerprint.fuzzyScanThreshold get() = fuzzyPatternScanMethod?.threshold ?: 0
+        get() = javaClass.findAnnotationRecursively(Name::class)?.name ?: this.javaClass.simpleName
+
+    val MethodFingerprint.version
+        get() = javaClass.findAnnotationRecursively(Version::class)?.version ?: "0.0.1"
+
+    val MethodFingerprint.description
+        get() = javaClass.findAnnotationRecursively(Description::class)?.description
+
+    val MethodFingerprint.fuzzyPatternScanMethod
+        get() = javaClass.findAnnotationRecursively(FuzzyPatternScanMethod::class)
+
+    val MethodFingerprint.fuzzyScanThreshold
+        get() = fuzzyPatternScanMethod?.threshold ?: 0
 }

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

@@ -16,7 +16,6 @@ import org.jf.dexlib2.iface.instruction.Instruction
 import org.jf.dexlib2.iface.reference.MethodReference
 import org.jf.dexlib2.immutable.ImmutableMethod
 import org.jf.dexlib2.immutable.ImmutableMethodImplementation
-import org.jf.dexlib2.util.MethodUtil
 import java.io.OutputStream
 
 infix fun AccessFlags.or(other: AccessFlags) = this.value or other.value
@@ -47,16 +46,14 @@ fun MutableMethodImplementation.removeInstructions(index: Int, count: Int) {
 }
 
 /**
- * Compare a method to another, considering constructors and parameters.
+ * Compare a method to another, considering name and parameters.
  * @param otherMethod The method to compare against.
  * @return True if the methods match given the conditions.
  */
 fun Method.softCompareTo(otherMethod: MethodReference): Boolean {
-    if (MethodUtil.isConstructor(this) && !parametersEqual(
-            this.parameterTypes, otherMethod.parameterTypes
-        )
-    ) return false
-    return this.name == otherMethod.name
+    return this.name == otherMethod.name && parametersEqual(
+        this.parameterTypes, otherMethod.parameterTypes
+    )
 }
 
 /**

src/main/kotlin/app/revanced/patcher/fingerprint/method/annotation/MethodFingerprintMetadata.kt

@@ -2,18 +2,6 @@ package app.revanced.patcher.fingerprint.method.annotation
 
 import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
 
-/**
- * Annotations for a method which matches to a [MethodFingerprint].
- * @param definingClass The defining class name of the method.
- * @param name A suggestive name for the method which the [MethodFingerprint] was created for.
- */
-@Target(AnnotationTarget.CLASS)
-@Retention(AnnotationRetention.RUNTIME)
-annotation class MatchingMethod(
-    val definingClass: String = "L<unspecified-class>;",
-    val name: String = "<unspecified-method>"
-)
-
 /**
  * Annotations to scan a pattern [MethodFingerprint] with fuzzy algorithm.
  * @param threshold if [threshold] or more of the opcodes do not match, skip.
@@ -22,11 +10,4 @@ annotation class MatchingMethod(
 @Retention(AnnotationRetention.RUNTIME)
 annotation class FuzzyPatternScanMethod(
     val threshold: Int = 1
-)
-
-/**
- * Annotations to scan a pattern [MethodFingerprint] directly.
- */
-@Target(AnnotationTarget.CLASS)
-@Retention(AnnotationRetention.RUNTIME)
-annotation class DirectPatternScanMethod
+)

src/main/kotlin/app/revanced/patcher/fingerprint/method/utils/MethodFingerprintUtils.kt

@@ -1,158 +0,0 @@
-package app.revanced.patcher.fingerprint.method.utils
-
-import app.revanced.patcher.data.impl.BytecodeData
-import app.revanced.patcher.extensions.MethodFingerprintExtensions.fuzzyPatternScanMethod
-import app.revanced.patcher.extensions.MethodFingerprintExtensions.fuzzyScanThreshold
-import app.revanced.patcher.extensions.parametersEqual
-import app.revanced.patcher.fingerprint.method.annotation.FuzzyPatternScanMethod
-import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
-import app.revanced.patcher.fingerprint.method.impl.MethodFingerprintResult
-import app.revanced.patcher.fingerprint.method.impl.PatternScanResult
-import org.jf.dexlib2.Opcode
-import org.jf.dexlib2.iface.ClassDef
-import org.jf.dexlib2.iface.Method
-import org.jf.dexlib2.iface.instruction.Instruction
-import org.jf.dexlib2.iface.instruction.ReferenceInstruction
-import org.jf.dexlib2.iface.reference.StringReference
-
-/**
- * Utility class for [MethodFingerprint]
- */
-object MethodFingerprintUtils {
-    /**
-     * Resolve a list of [MethodFingerprint] against a list of [ClassDef].
-     * @param context The classes on which to resolve the [MethodFingerprint].
-     * @param forData The [BytecodeData] to host proxies.
-     * @return True if the resolution was successful, false otherwise.
-     */
-    fun Iterable<MethodFingerprint>.resolve(forData: BytecodeData, context: Iterable<ClassDef>) {
-        for (fingerprint in this) // For each fingerprint
-            classes@ for (classDef in context) // search through all classes for the fingerprint
-                if (fingerprint.resolve(forData, classDef))
-                    break@classes // if the resolution succeeded, continue with the next fingerprint
-    }
-
-    /**
-     * Resolve a [MethodFingerprint] against a [ClassDef].
-     * @param context The class on which to resolve the [MethodFingerprint].
-     * @param forData The [BytecodeData] to host proxies.
-     * @return True if the resolution was successful, false otherwise.
-     */
-    fun MethodFingerprint.resolve(forData: BytecodeData, context: ClassDef): Boolean {
-        for (method in context.methods)
-            if (this.resolve(forData, method, context))
-                return true
-        return false
-    }
-
-    /**
-     * Resolve a [MethodFingerprint] against a [Method].
-     * @param context The context on which to resolve the [MethodFingerprint].
-     * @param classDef The class of the matching [Method].
-     * @param forData The [BytecodeData] to host proxies.
-     * @return True if the resolution was successful, false otherwise.
-     */
-    fun MethodFingerprint.resolve(forData: BytecodeData, context: Method, classDef: ClassDef): Boolean {
-        val methodFingerprint = this
-
-        if (methodFingerprint.returnType != null && !context.returnType.startsWith(methodFingerprint.returnType))
-            return false
-
-        if (methodFingerprint.access != null && methodFingerprint.access != context.accessFlags)
-            return false
-
-
-        if (methodFingerprint.parameters != null && !parametersEqual(
-                methodFingerprint.parameters, // TODO: parseParameters()
-                context.parameterTypes
-            )
-        ) return false
-
-        if (methodFingerprint.customFingerprint != null && !methodFingerprint.customFingerprint!!(context))
-            return false
-
-        if (methodFingerprint.strings != null) {
-            val implementation = context.implementation ?: return false
-
-            val stringsList = methodFingerprint.strings.toMutableList()
-
-            implementation.instructions.forEach { instruction ->
-                if (instruction.opcode.ordinal != Opcode.CONST_STRING.ordinal) return@forEach
-
-                val string = ((instruction as ReferenceInstruction).reference as StringReference).string
-                val index = stringsList.indexOfFirst { it == string }
-                if (index != -1) stringsList.removeAt(index)
-            }
-
-            if (stringsList.isNotEmpty()) return false
-        }
-
-        val patternScanResult = if (methodFingerprint.opcodes != null) {
-            context.implementation?.instructions ?: return false
-
-            context.patternScan(methodFingerprint) ?: return false
-        } else null
-
-        methodFingerprint.result = MethodFingerprintResult(context, classDef, patternScanResult, forData)
-
-        return true
-    }
-
-    private fun Method.patternScan(
-        fingerprint: MethodFingerprint
-    ): PatternScanResult? {
-        val instructions = this.implementation!!.instructions
-        val fingerprintFuzzyPatternScanThreshold = fingerprint.fuzzyScanThreshold
-
-        val pattern = fingerprint.opcodes!!
-        val instructionLength = instructions.count()
-        val patternLength = pattern.count()
-
-        for (index in 0 until instructionLength) {
-            var patternIndex = 0
-            var threshold = fingerprintFuzzyPatternScanThreshold
-
-            while (index + patternIndex < instructionLength) {
-                val originalOpcode = instructions.elementAt(index + patternIndex).opcode
-                val patternOpcode = pattern.elementAt(patternIndex)
-
-                if (patternOpcode != null && patternOpcode.ordinal != originalOpcode.ordinal) {
-                    // reaching maximum threshold (0) means,
-                    // the pattern does not match to the current instructions
-                    if (threshold-- == 0) break
-                }
-
-                if (patternIndex < patternLength - 1) {
-                    // if the entire pattern has not been scanned yet
-                    // continue the scan
-                    patternIndex++
-                    continue
-                }
-                // the pattern is valid, generate warnings if fuzzyPatternScanMethod is FuzzyPatternScanMethod
-                val result = PatternScanResult(index, index + patternIndex)
-                if (fingerprint.fuzzyPatternScanMethod !is FuzzyPatternScanMethod) return result
-                result.warnings = result.createWarnings(pattern, instructions)
-
-                return result
-            }
-        }
-
-        return null
-    }
-}
-
-private fun PatternScanResult.createWarnings(
-    pattern: Iterable<Opcode?>, instructions: Iterable<Instruction>
-) = buildList {
-    for ((patternIndex, instructionIndex) in (this@createWarnings.startIndex until this@createWarnings.endIndex).withIndex()) {
-        val originalOpcode = instructions.elementAt(instructionIndex).opcode
-        val patternOpcode = pattern.elementAt(patternIndex)
-
-        if (patternOpcode == null || patternOpcode.ordinal == originalOpcode.ordinal) continue
-
-        this.add(PatternScanResult.Warning(originalOpcode, patternOpcode, instructionIndex, patternIndex))
-    }
-}
-
-private operator fun ClassDef.component1() = this
-private operator fun ClassDef.component2() = this.methods

src/main/kotlin/app/revanced/patcher/patch/OptionsContainer.kt

@@ -0,0 +1,18 @@
+package app.revanced.patcher.patch
+
+/**
+ * A container for patch options.
+ */
+abstract class OptionsContainer {
+    /**
+     * A list of [PatchOption]s.
+     * @see PatchOptions
+     */
+    @Suppress("MemberVisibilityCanBePrivate")
+    val options = PatchOptions()
+
+    protected fun <T> option(opt: PatchOption<T>): PatchOption<T> {
+        options.register(opt)
+        return opt
+    }
+}

src/main/kotlin/app/revanced/patcher/patch/Patch.kt

@@ -1,25 +1,44 @@
 package app.revanced.patcher.patch
 
-import app.revanced.patcher.data.Data
-import app.revanced.patcher.patch.impl.BytecodePatch
-import app.revanced.patcher.patch.impl.ResourcePatch
+import app.revanced.patcher.data.BytecodeContext
+import app.revanced.patcher.data.Context
+import app.revanced.patcher.data.ResourceContext
+import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
 import java.io.Closeable
 
 /**
  * A ReVanced patch.
  *
- * Can either be a [ResourcePatch] or a [BytecodePatch].
  * If it implements [Closeable], it will be closed after all patches have been executed.
  * Closing will be done in reverse execution order.
  */
-abstract class Patch<out T : Data> {
+sealed interface Patch<out T : Context> : Closeable {
     /**
      * The main function of the [Patch] which the patcher will call.
+     *
+     * @param context The [Context] the patch will work on.
+     * @return The result of executing the patch.
      */
-    abstract fun execute(data: @UnsafeVariance T): PatchResult
+    fun execute(context: @UnsafeVariance T): PatchResult
 
     /**
-     * A list of [PatchOption]s.
+     * The closing function for this patch.
+     *
+     * This can be treated like popping the patch from the current patch stack.
      */
-    open val options = PatchOptions()
-}
+    override fun close() {}
+}
+
+/**
+ * Resource patch for the Patcher.
+ */
+interface ResourcePatch : Patch<ResourceContext>
+
+/**
+ * Bytecode patch for the Patcher.
+ *
+ * @param fingerprints A list of [MethodFingerprint] this patch relies on.
+ */
+abstract class BytecodePatch(
+    internal val fingerprints: Iterable<MethodFingerprint>? = null
+) : Patch<BytecodeContext>

src/main/kotlin/app/revanced/patcher/patch/PatchOption.kt

@@ -1,32 +1,56 @@
-@file:Suppress("CanBeParameter", "MemberVisibilityCanBePrivate")
+@file:Suppress("CanBeParameter", "MemberVisibilityCanBePrivate", "UNCHECKED_CAST")
 
 package app.revanced.patcher.patch
 
+import java.nio.file.Path
+import kotlin.io.path.pathString
+import kotlin.reflect.KProperty
+
 class NoSuchOptionException(val option: String) : Exception("No such option: $option")
 class IllegalValueException(val value: Any?) : Exception("Illegal value: $value")
 class InvalidTypeException(val got: String, val expected: String) :
     Exception("Invalid option value type: $got, expected $expected")
 
+object RequirementNotMetException : Exception("null was passed into an option that requires a value")
+
 /**
  * A registry for an array of [PatchOption]s.
  * @param options An array of [PatchOption]s.
  */
-class PatchOptions(vararg val options: PatchOption<*>) : Iterable<PatchOption<*>> {
-    private val register = buildMap {
-        for (option in options) {
-            if (containsKey(option.key)) {
-                throw IllegalStateException("Multiple options found with the same key")
-            }
-            put(option.key, option)
+class PatchOptions(vararg options: PatchOption<*>) : Iterable<PatchOption<*>> {
+    private val register = mutableMapOf<String, PatchOption<*>>()
+
+    init {
+        options.forEach { register(it) }
+    }
+
+    internal fun register(option: PatchOption<*>) {
+        if (register.containsKey(option.key)) {
+            throw IllegalStateException("Multiple options found with the same key")
         }
+        register[option.key] = option
     }
 
     /**
      * Get a [PatchOption] by its key.
      * @param key The key of the [PatchOption].
      */
+    @JvmName("getUntyped")
     operator fun get(key: String) = register[key] ?: throw NoSuchOptionException(key)
 
+    /**
+     * Get a [PatchOption] by its key.
+     * @param key The key of the [PatchOption].
+     */
+    inline operator fun <reified T> get(key: String): PatchOption<T> {
+        val opt = get(key)
+        if (opt.value !is T) throw InvalidTypeException(
+            opt.value?.let { it::class.java.canonicalName } ?: "null",
+            T::class.java.canonicalName
+        )
+        return opt as PatchOption<T>
+    }
+
     /**
      * Set the value of a [PatchOption].
      * @param key The key of the [PatchOption].
@@ -34,7 +58,7 @@ class PatchOptions(vararg val options: PatchOption<*>) : Iterable<PatchOption<*>
      * Please note that using the wrong value type results in a runtime error.
      */
     inline operator fun <reified T> set(key: String, value: T) {
-        @Suppress("UNCHECKED_CAST") val opt = get(key) as PatchOption<T>
+        val opt = get<T>(key)
         if (opt.value !is T) throw InvalidTypeException(
             T::class.java.canonicalName,
             opt.value?.let { it::class.java.canonicalName } ?: "null"
@@ -50,7 +74,7 @@ class PatchOptions(vararg val options: PatchOption<*>) : Iterable<PatchOption<*>
         get(key).value = null
     }
 
-    override fun iterator() = options.iterator()
+    override fun iterator() = register.values.iterator()
 }
 
 /**
@@ -71,13 +95,54 @@ sealed class PatchOption<T>(
     val validator: (T?) -> Boolean
 ) {
     var value: T? = default
+        get() {
+            if (field == null && required) {
+                throw RequirementNotMetException
+            }
+            return field
+        }
         set(value) {
+            if (value == null && required) {
+                throw RequirementNotMetException
+            }
             if (!validator(value)) {
                 throw IllegalValueException(value)
             }
             field = value
         }
 
+    /**
+     * Gets the value of the option.
+     * Please note that using the wrong value type results in a runtime error.
+     */
+    @JvmName("getValueTyped")
+    inline operator fun <reified V> getValue(thisRef: Nothing?, property: KProperty<*>): V? {
+        if (value !is V?) throw InvalidTypeException(
+            V::class.java.canonicalName,
+            value?.let { it::class.java.canonicalName } ?: "null"
+        )
+        return value as? V?
+    }
+
+    operator fun getValue(thisRef: Any?, property: KProperty<*>) = value
+
+    /**
+     * Gets the value of the option.
+     * Please note that using the wrong value type results in a runtime error.
+     */
+    @JvmName("setValueTyped")
+    inline operator fun <reified V> setValue(thisRef: Nothing?, property: KProperty<*>, new: V) {
+        if (value !is V) throw InvalidTypeException(
+            V::class.java.canonicalName,
+            value?.let { it::class.java.canonicalName } ?: "null"
+        )
+        value = new as T
+    }
+
+    operator fun setValue(thisRef: Any?, property: KProperty<*>, new: T?) {
+        value = new
+    }
+
     /**
      * A [PatchOption] representing a [String].
      * @see PatchOption
@@ -127,8 +192,8 @@ sealed class PatchOption<T>(
         }
     ) {
         init {
-            if (default !in options) {
-                throw IllegalStateException("Default option must be an allowed options")
+            if (default != null && default !in options) {
+                throw IllegalStateException("Default option must be an allowed option")
             }
         }
     }
@@ -164,4 +229,20 @@ sealed class PatchOption<T>(
     ) : ListOption<Int>(
         key, default, options, title, description, required, validator
     )
-}
+
+    /**
+     * A [PatchOption] representing a [Path], backed by a [String].
+     * The validator passes a [String], if you need a [Path] you will have to convert it yourself.
+     * @see PatchOption
+     */
+    class PathOption(
+        key: String,
+        default: Path?,
+        title: String,
+        description: String,
+        required: Boolean = false,
+        validator: (String?) -> Boolean = { true }
+    ) : PatchOption<String>(
+        key, default?.pathString, title, description, required, validator
+    )
+}

src/main/kotlin/app/revanced/patcher/patch/annotations/PatchAnnotation.kt

@@ -1,6 +1,6 @@
 package app.revanced.patcher.patch.annotations
 
-import app.revanced.patcher.data.Data
+import app.revanced.patcher.data.Context
 import app.revanced.patcher.patch.Patch
 import kotlin.reflect.KClass
 
@@ -19,29 +19,6 @@ annotation class Patch(val include: Boolean = true)
 @Target(AnnotationTarget.CLASS)
 @Retention(AnnotationRetention.RUNTIME)
 @MustBeDocumented
-@Deprecated(
-    "Does not support new parameter 'type'",
-    ReplaceWith("DependsOn")
-)
-annotation class Dependencies(
-    val dependencies: Array<KClass<out Patch<Data>>> = []
-)
-
-/**
- * Annotation for dependencies of [Patch]es .
- */
-@Target(AnnotationTarget.CLASS)
-@Retention(AnnotationRetention.RUNTIME)
-@MustBeDocumented
-@Repeatable
 annotation class DependsOn(
-    val value: KClass<out Patch<Data>>,
-    val type: DependencyType = DependencyType.HARD
-)
-
-enum class DependencyType {
-    /**
-     * Enforces that the dependency is applied, even if it was not selected.
-     */
-    HARD
-}
+    val dependencies: Array<KClass<out Patch<Context>>> = []
+)

src/main/kotlin/app/revanced/patcher/patch/impl/BytecodePatch.kt

@@ -1,13 +0,0 @@
-package app.revanced.patcher.patch.impl
-
-import app.revanced.patcher.data.impl.BytecodeData
-import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
-import app.revanced.patcher.patch.Patch
-
-/**
- * Bytecode patch for the Patcher.
- * @param fingerprints A list of [MethodFingerprint] this patch relies on.
- */
-abstract class BytecodePatch(
-    internal val fingerprints: Iterable<MethodFingerprint>? = null
-) : Patch<BytecodeData>()

src/main/kotlin/app/revanced/patcher/patch/impl/ResourcePatch.kt

@@ -1,9 +0,0 @@
-package app.revanced.patcher.patch.impl
-
-import app.revanced.patcher.data.impl.ResourceData
-import app.revanced.patcher.patch.Patch
-
-/**
- * Resource patch for the Patcher.
- */
-abstract class ResourcePatch : Patch<ResourceData>()

src/main/kotlin/app/revanced/patcher/util/ProxyBackedClassList.kt

@@ -3,40 +3,44 @@ package app.revanced.patcher.util
 import app.revanced.patcher.util.proxy.ClassProxy
 import org.jf.dexlib2.iface.ClassDef
 
-class ProxyBackedClassList(internal val internalClasses: MutableList<ClassDef>) : List<ClassDef> {
-    private val internalProxies = mutableListOf<ClassProxy>()
-    internal val proxies: List<ClassProxy> = internalProxies
-
-    fun add(classDef: ClassDef) = internalClasses.add(classDef)
-    fun add(classProxy: ClassProxy) = internalProxies.add(classProxy)
+/**
+ * A class that represents a set of classes and proxies.
+ *
+ * @param classes The classes to be backed by proxies.
+ */
+class ProxyBackedClassList(internal val classes: MutableList<ClassDef>) : Set<ClassDef> {
+    internal val proxies = mutableListOf<ClassProxy>()
 
     /**
-     * Apply all resolved classes into [internalClasses] and clean the [proxies] list.
+     * Add a [ClassDef].
      */
-    internal fun applyProxies() {
-        // FIXME: check if this could cause issues when multiple patches use the same proxy
-        internalProxies.removeIf { proxy ->
-            // if the proxy is unused, keep it in the list
-            if (!proxy.proxyUsed) return@removeIf false
+    fun add(classDef: ClassDef) = classes.add(classDef)
 
-            // if it has been used, replace the internal class which it proxied
-            val index = internalClasses.indexOfFirst { it.type == proxy.immutableClass.type }
-            internalClasses[index] = proxy.mutatedClass
+    /**
+     * Add a [ClassProxy].
+     */
+    fun add(classProxy: ClassProxy) = proxies.add(classProxy)
+
+    /**
+     * Replace all classes with their mutated versions.
+     */
+    internal fun replaceClasses() =
+        proxies.removeIf { proxy ->
+            // if the proxy is unused, keep it in the list
+            if (!proxy.resolved) return@removeIf false
+
+            // if it has been used, replace the original class with the new class
+            val index = classes.indexOfFirst { it.type == proxy.immutableClass.type }
+            classes[index] = proxy.mutableClass
 
             // return true to remove it from the proxies list
             return@removeIf true
         }
-    }
 
-    override val size get() = internalClasses.size
-    override fun contains(element: ClassDef) = internalClasses.contains(element)
-    override fun containsAll(elements: Collection<ClassDef>) = internalClasses.containsAll(elements)
-    override fun get(index: Int) = internalClasses[index]
-    override fun indexOf(element: ClassDef) = internalClasses.indexOf(element)
-    override fun isEmpty() = internalClasses.isEmpty()
-    override fun iterator() = internalClasses.iterator()
-    override fun lastIndexOf(element: ClassDef) = internalClasses.lastIndexOf(element)
-    override fun listIterator() = internalClasses.listIterator()
-    override fun listIterator(index: Int) = internalClasses.listIterator(index)
-    override fun subList(fromIndex: Int, toIndex: Int) = internalClasses.subList(fromIndex, toIndex)
+
+    override val size get() = classes.size
+    override fun contains(element: ClassDef) = classes.contains(element)
+    override fun containsAll(elements: Collection<ClassDef>) = classes.containsAll(elements)
+    override fun isEmpty() = classes.isEmpty()
+    override fun iterator() = classes.iterator()
 }

src/main/kotlin/app/revanced/patcher/util/VersionReader.kt

@@ -0,0 +1,18 @@
+package app.revanced.patcher.util
+
+import java.util.*
+
+internal object VersionReader {
+    @JvmStatic
+    private val props = Properties().apply {
+        load(
+            VersionReader::class.java.getResourceAsStream("/revanced-patcher/version.properties")
+                ?: throw IllegalStateException("Could not load version.properties")
+        )
+    }
+
+    @JvmStatic
+    fun read(): String {
+        return props.getProperty("version") ?: throw IllegalStateException("Version not found")
+    }
+}

src/main/kotlin/app/revanced/patcher/util/dex/DexFile.kt

@@ -5,6 +5,6 @@ import java.io.InputStream
 /**
  * Wrapper for dex files.
  * @param name The original name of the dex file.
- * @param dexFileInputStream The dex file as [InputStream].
+ * @param stream The dex file as [InputStream].
  */
-data class DexFile(val name: String, val dexFileInputStream: InputStream)
+data class DexFile(val name: String, val stream: InputStream)

src/main/kotlin/app/revanced/patcher/util/method/MethodWalker.kt

@@ -1,7 +1,6 @@
 package app.revanced.patcher.util.method
 
-import app.revanced.patcher.data.impl.BytecodeData
-import app.revanced.patcher.data.impl.MethodNotFoundException
+import app.revanced.patcher.data.BytecodeContext
 import app.revanced.patcher.extensions.softCompareTo
 import app.revanced.patcher.util.proxy.mutableTypes.MutableMethod
 import org.jf.dexlib2.iface.Method
@@ -10,16 +9,19 @@ import org.jf.dexlib2.iface.reference.MethodReference
 
 /**
  * Find a method from another method via instruction offsets.
- * @param bytecodeData The bytecodeData to use when resolving the next method reference.
+ * @param bytecodeContext The context to use when resolving the next method reference.
  * @param currentMethod The method to start from.
  */
 class MethodWalker internal constructor(
-    private val bytecodeData: BytecodeData,
+    private val bytecodeContext: BytecodeContext,
     private var currentMethod: Method
 ) {
     /**
      * Get the method which was walked last.
+     *
      * It is possible to cast this method to a [MutableMethod], if the method has been walked mutably.
+     *
+     * @return The method which was walked last.
      */
     fun getMethod(): Method {
         return currentMethod
@@ -27,18 +29,21 @@ class MethodWalker internal constructor(
 
     /**
      * Walk to a method defined at the offset in the instruction list of the current method.
+     *
+     * The current method will be mutable.
+     *
      * @param offset The offset of the instruction. This instruction must be of format 35c.
      * @param walkMutable If this is true, the class of the method will be resolved mutably.
-     * The current method will be mutable.
+     * @return The same [MethodWalker] instance with the method at [offset].
      */
     fun nextMethod(offset: Int, walkMutable: Boolean = false): MethodWalker {
         currentMethod.implementation?.instructions?.let { instructions ->
             val instruction = instructions.elementAt(offset)
 
             val newMethod = (instruction as ReferenceInstruction).reference as MethodReference
-            val proxy = bytecodeData.findClass(newMethod.definingClass)!!
+            val proxy = bytecodeContext.findClass(newMethod.definingClass)!!
 
-            val methods = if (walkMutable) proxy.resolve().methods else proxy.immutableClass.methods
+            val methods = if (walkMutable) proxy.mutableClass.methods else proxy.immutableClass.methods
             currentMethod = methods.first { it ->
                 return@first it.softCompareTo(newMethod)
             }
@@ -47,5 +52,5 @@ class MethodWalker internal constructor(
         throw MethodNotFoundException("This method can not be walked at offset $offset inside the method ${currentMethod.name}")
     }
 
-
+    internal class MethodNotFoundException(exception: String) : Exception(exception)
 }

src/main/kotlin/app/revanced/patcher/util/patch/PatchBundle.kt

@@ -0,0 +1,74 @@
+@file:Suppress("unused")
+
+package app.revanced.patcher.util.patch
+
+import app.revanced.patcher.data.Context
+import app.revanced.patcher.patch.Patch
+import org.jf.dexlib2.DexFileFactory
+import java.io.File
+import java.net.URLClassLoader
+import java.util.jar.JarFile
+
+/**
+ * A patch bundle.
+
+ * @param path The path to the patch bundle.
+ */
+sealed class PatchBundle(path: String) : File(path) {
+    internal fun loadPatches(classLoader: ClassLoader, classNames: Iterator<String>) = buildList {
+        for (className in classNames) {
+            val clazz = classLoader.loadClass(className)
+            if (!clazz.isAnnotationPresent(app.revanced.patcher.patch.annotations.Patch::class.java)) continue
+            @Suppress("UNCHECKED_CAST") this.add(clazz as Class<out Patch<Context>>)
+        }
+    }
+
+    /**
+     * A patch bundle of type [Jar].
+     *
+     * @param patchBundlePath The path to the patch bundle.
+     */
+    class Jar(patchBundlePath: String) : PatchBundle(patchBundlePath) {
+
+        /**
+         * Load patches from the patch bundle.
+         *
+         * Patches will be loaded with a new [URLClassLoader].
+         */
+        fun loadPatches() = loadPatches(
+            URLClassLoader(
+                arrayOf(this.toURI().toURL()),
+                Thread.currentThread().contextClassLoader // TODO: find out why this is required
+            ),
+            StringIterator(
+                JarFile(this)
+                    .entries()
+                    .toList() // TODO: find a cleaner solution than that to filter non class files
+                    .filter {
+                        it.name.endsWith(".class") && !it.name.contains("$")
+                    }
+                    .iterator()
+            ) {
+                it.realName.replace('/', '.').replace(".class", "")
+            }
+        )
+    }
+
+    /**
+     * A patch bundle of type [Dex] format.
+     *
+     * @param patchBundlePath The path to a patch bundle of dex format.
+     * @param dexClassLoader The dex class loader.
+     */
+    class Dex(patchBundlePath: String, private val dexClassLoader: ClassLoader) : PatchBundle(patchBundlePath) {
+        /**
+         * Load patches from the patch bundle.
+         *
+         * Patches will be loaded to the provided [dexClassLoader].
+         */
+        fun loadPatches() = loadPatches(dexClassLoader,
+            StringIterator(DexFileFactory.loadDexFile(path, null).classes.iterator()) { classDef ->
+                classDef.type.substring(1, classDef.length - 1).replace('/', '.')
+            })
+    }
+}