feat: PatchLoader

Signed-off-by: oSumAtrIX <johan.melkonyan1@web.de>

src/main/kotlin/app/revanced/patcher/signature/implementation/method/annotation/MethodSignatureMetadata.kt

@@ -10,8 +10,8 @@ import app.revanced.patcher.signature.implementation.method.MethodSignature
 @Target(AnnotationTarget.CLASS)
 @Retention(AnnotationRetention.RUNTIME)
 annotation class MatchingMethod(
-    val definingClass: String = "L<empty>",
+    val definingClass: String = "L<unspecified-class>",
-    val name: String = "<method>"
+    val name: String = "<unspecified-method>"
 )
 
 /**

src/main/kotlin/app/revanced/patcher/signature/implementation/method/resolver/MethodSignatureResolverResult.kt

@@ -10,11 +10,11 @@ import org.jf.dexlib2.iface.Method
  * Represents the result of a [MethodSignatureResolver].
  * @param definingClassProxy The [ClassProxy] that the matching method was found in.
  * @param resolvedMethod The actual matching method.
- * @param scanData Opcodes pattern scan result.
+ * @param scanResult Opcodes pattern scan result.
  */
 data class SignatureResolverResult(
     val definingClassProxy: ClassProxy,
-    val scanData: PatternScanResult,
+    val scanResult: PatternScanResult,
     private val resolvedMethod: Method,
 ) {
     /**

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

@@ -0,0 +1,34 @@
+package app.revanced.patcher.util.patch
+
+import app.revanced.patcher.patch.base.Patch
+import java.io.File
+import java.net.URLClassLoader
+import java.util.jar.JarFile
+
+object PatchLoader {
+    /**
+     * This method loads patches from a given jar file containing [Patch]es
+     * @return the loaded patches represented as a list of [Patch] classes
+     */
+    fun loadFromFile(patchesJar: File) = buildList {
+        val jarFile = JarFile(patchesJar)
+        val classLoader = URLClassLoader(arrayOf(patchesJar.toURI().toURL()))
+
+        val entries = jarFile.entries()
+        while (entries.hasMoreElements()) {
+            val entry = entries.nextElement()
+            if (!entry.name.endsWith(".class") || entry.name.contains("$")) continue
+
+            val clazz = classLoader.loadClass(entry.realName.replace('/', '.').replace(".class", ""))
+
+            if (!clazz.isAnnotationPresent(app.revanced.patcher.patch.annotations.Patch::class.java)) continue
+
+            @Suppress("UNCHECKED_CAST")
+            val patch = clazz as Class<Patch<*>>
+
+            // TODO: include declared classes from patch
+
+            this.add(patch)
+        }
+    }
+}

src/test/kotlin/app/revanced/patcher/usage/bytecode/patch/ExampleBytecodePatch.kt

@@ -55,7 +55,7 @@ class ExampleBytecodePatch : BytecodePatch(
         // 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
+        val startIndex = result.scanResult.startIndex
 
         implementation.replaceStringAt(startIndex, "Hello, ReVanced! Editing bytecode.")