feat: general-reddit-ads patch (#235)

src/main/kotlin/app/revanced/patches/reddit/ad/general/annotations/GeneralAdsCompatibility.kt

@@ -0,0 +1,13 @@
+package app.revanced.patches.reddit.ad.general.annotations
+
+import app.revanced.patcher.annotation.Compatibility
+import app.revanced.patcher.annotation.Package
+
+@Compatibility(
+    [Package(
+        "com.reddit.frontpage", arrayOf()
+    )]
+)
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+internal annotation class GeneralAdsCompatibility

src/main/kotlin/app/revanced/patches/reddit/ad/general/patch/GeneralAdsPatch.kt

@@ -0,0 +1,55 @@
+package app.revanced.patches.reddit.ad.general.patch
+
+import app.revanced.patcher.annotation.Description
+import app.revanced.patcher.annotation.Name
+import app.revanced.patcher.annotation.Version
+import app.revanced.patcher.data.impl.BytecodeData
+import app.revanced.patcher.extensions.replaceInstruction
+import app.revanced.patcher.patch.annotations.Patch
+import app.revanced.patcher.patch.impl.BytecodePatch
+import app.revanced.patcher.patch.PatchResult
+import app.revanced.patcher.patch.PatchResultSuccess
+import app.revanced.patches.reddit.ad.general.annotations.GeneralAdsCompatibility
+import org.jf.dexlib2.Opcode
+import org.jf.dexlib2.builder.instruction.BuilderInstruction21c
+import org.jf.dexlib2.iface.instruction.ReferenceInstruction
+import org.jf.dexlib2.iface.reference.StringReference
+import org.jf.dexlib2.immutable.reference.ImmutableStringReference
+
+@Patch
+@Name("general-reddit-ads")
+@Description("Removes general ads from the Reddit frontpage and subreddits.")
+@GeneralAdsCompatibility
+@Version("0.0.1")
+class GeneralAdsPatch : BytecodePatch() {
+    override fun execute(data: BytecodeData): PatchResult {
+        data.classes.forEach { classDef ->
+            classDef.methods.forEach methodLoop@{ method ->
+                val implementation = method.implementation ?: return@methodLoop
+
+                implementation.instructions.forEachIndexed { i, instruction ->
+                    if (instruction.opcode != Opcode.CONST_STRING) return@forEachIndexed
+                    if (((instruction as ReferenceInstruction).reference as StringReference).string != "AdPost") return@forEachIndexed
+
+                    val proxiedClass = data.proxy(classDef).resolve()
+
+                    val proxiedImplementation = proxiedClass.methods.first {
+                        it.name == method.name && it.parameterTypes.containsAll(method.parameterTypes)
+                    }.implementation!!
+
+                    var newString = "AdPost1"
+                    if (proxiedImplementation.instructions[i - 1].opcode == Opcode.CONST_STRING) {
+                        newString = "SubredditPost"
+                    }
+                    proxiedImplementation.replaceInstruction(
+                        i, BuilderInstruction21c(
+                            Opcode.CONST_STRING, (proxiedImplementation.instructions[i] as BuilderInstruction21c).registerA, ImmutableStringReference(newString)
+                        )
+                    )
+                }
+            }
+        }
+
+        return PatchResultSuccess()
+    }
+}