feat(Crunchyroll): Add Hide ads patch (#5201)

Author: hoo-dles

patches/api/patches.api

@@ -160,6 +160,10 @@ public final class app/revanced/patches/cieid/restrictions/root/BypassRootChecks
 	public static final fun getBypassRootChecksPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
 }
 
+public final class app/revanced/patches/crunchyroll/ads/HideAdsPatchKt {
+	public static final fun getHideAdsPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
+}
+
 public final class app/revanced/patches/duolingo/ad/DisableAdsPatchKt {
 	public static final fun getDisableAdsPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
 }

patches/src/main/kotlin/app/revanced/patches/crunchyroll/ads/Fingerprints.kt

@@ -0,0 +1,7 @@
+package app.revanced.patches.crunchyroll.ads
+
+import app.revanced.patcher.fingerprint
+
+internal val videoUrlReadyToStringFingerprint = fingerprint {
+    strings("VideoUrlReady(url=", ", enableAds=")
+}

patches/src/main/kotlin/app/revanced/patches/crunchyroll/ads/HideAdsPatch.kt

@@ -0,0 +1,46 @@
+package app.revanced.patches.crunchyroll.ads
+
+import app.revanced.patcher.extensions.InstructionExtensions.addInstructions
+import app.revanced.patcher.extensions.InstructionExtensions.getInstruction
+import app.revanced.patcher.extensions.InstructionExtensions.instructions
+import app.revanced.patcher.patch.bytecodePatch
+import app.revanced.util.getReference
+import app.revanced.util.indexOfFirstInstruction
+import app.revanced.util.removeFlags
+import com.android.tools.smali.dexlib2.AccessFlags
+import com.android.tools.smali.dexlib2.Opcode
+import com.android.tools.smali.dexlib2.iface.instruction.ReferenceInstruction
+import com.android.tools.smali.dexlib2.iface.reference.FieldReference
+
+@Suppress("unused")
+val hideAdsPatch = bytecodePatch(
+    name = "Hide Ads"
+) {
+    compatibleWith("com.crunchyroll.crunchyroid")
+
+    execute {
+        // Get obfuscated "enableAds" field from toString method.
+        val enableAdsField = videoUrlReadyToStringFingerprint.let {
+            val strIndex = videoUrlReadyToStringFingerprint.stringMatches!!.last().index
+            val fieldIndex = it.method.indexOfFirstInstruction(strIndex, Opcode.IGET_BOOLEAN)
+            it.method.getInstruction<ReferenceInstruction>(fieldIndex).getReference<FieldReference>()!!
+        }
+
+        // Remove final access flag on field.
+        videoUrlReadyToStringFingerprint.classDef.fields
+            .first { it.name == enableAdsField.name }
+            .removeFlags(AccessFlags.FINAL)
+
+        // Override enableAds field in non-default constructor.
+        val constructor = videoUrlReadyToStringFingerprint.classDef.methods.first {
+            AccessFlags.CONSTRUCTOR.isSet(it.accessFlags) && it.parameters.isNotEmpty()
+        }
+        constructor.addInstructions(
+            constructor.instructions.count() - 1,
+            """
+                move-object/from16 v0, p0
+                const/4 v1, 0x0
+                iput-boolean v1, v0, $enableAdsField
+            """)
+    }
+}

patches/src/main/kotlin/app/revanced/util/BytecodeUtils.kt

@@ -10,6 +10,7 @@ import app.revanced.patcher.extensions.InstructionExtensions.removeInstruction
 import app.revanced.patcher.patch.BytecodePatchContext
 import app.revanced.patcher.patch.PatchException
 import app.revanced.patcher.util.proxy.mutableTypes.MutableClass
+import app.revanced.patcher.util.proxy.mutableTypes.MutableField
 import app.revanced.patcher.util.proxy.mutableTypes.MutableField.Companion.toMutable
 import app.revanced.patcher.util.proxy.mutableTypes.MutableMethod
 import app.revanced.patcher.util.smali.ExternalLabel
@@ -1021,6 +1022,14 @@ private fun MutableMethod.overrideReturnValue(value: String, returnLate: Boolean
     }
 }
 
+/**
+ * Remove the given AccessFlags from the field.
+ */
+internal fun MutableField.removeFlags(vararg flags: AccessFlags) {
+    val bitField = flags.map { it.value }.reduce { acc, flag -> acc and flag }
+    this.accessFlags = this.accessFlags and bitField.inv()
+}
+
 internal fun BytecodePatchContext.addStaticFieldToExtension(
     className: String,
     methodName: String,