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https://github.com/revanced/revanced-patches
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feat: add capability to filter from protobuf buffer
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@ -0,0 +1,25 @@
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package app.revanced.patches.youtube.misc.litho.filter.fingerprints
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import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
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import org.jf.dexlib2.Opcode
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object ProtobufBufferFingerprint : MethodFingerprint(
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opcodes = listOf(
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Opcode.IGET_OBJECT, // References the field required below.
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null,
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null,
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null,
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null,
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null,
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null,
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null,
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null,
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null,
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null,
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Opcode.IF_NEZ,
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Opcode.CONST_4,
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Opcode.GOTO,
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Opcode.CHECK_CAST, // Casts the referenced field to a specific type that stores the protobuf buffer.
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Opcode.INVOKE_VIRTUAL
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)
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)
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@ -17,6 +17,7 @@ import app.revanced.patches.youtube.misc.integrations.patch.IntegrationsPatch
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import app.revanced.patches.youtube.misc.litho.filter.annotation.LithoFilterCompatibility
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import app.revanced.patches.youtube.misc.litho.filter.fingerprints.ComponentContextParserFingerprint
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import app.revanced.patches.youtube.misc.litho.filter.fingerprints.EmptyComponentBuilderFingerprint
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import app.revanced.patches.youtube.misc.litho.filter.fingerprints.ProtobufBufferFingerprint
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import app.revanced.patches.youtube.misc.litho.filter.fingerprints.ReadComponentIdentifierFingerprint
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import org.jf.dexlib2.iface.instruction.Instruction
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import org.jf.dexlib2.iface.instruction.OneRegisterInstruction
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@ -32,7 +33,9 @@ class LithoFilterPatch : BytecodePatch(
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) {
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override fun execute(context: BytecodeContext): PatchResult {
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ComponentContextParserFingerprint.result?.also {
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arrayOf(EmptyComponentBuilderFingerprint, ReadComponentIdentifierFingerprint).forEach { fingerprint ->
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arrayOf(
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EmptyComponentBuilderFingerprint, ReadComponentIdentifierFingerprint, ProtobufBufferFingerprint
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).forEach { fingerprint ->
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if (!fingerprint.resolve(context, it.mutableMethod, it.mutableClass))
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return fingerprint.toErrorResult()
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}
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@ -45,26 +48,54 @@ class LithoFilterPatch : BytecodePatch(
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val builderMethodDescriptor = instruction(builderMethodIndex).descriptor
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val emptyComponentFieldDescriptor = instruction(emptyComponentFieldIndex).descriptor
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// Register is overwritten right after it is used in this patch, therefore free to clobber.
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val clobberedRegister = instruction(insertHookIndex - 1).twoRegisterA
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val free = instruction<TwoRegisterInstruction>(insertHookIndex - 1).registerA
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val free2 = instruction<OneRegisterInstruction>(insertHookIndex).registerA
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@Suppress("UnnecessaryVariable")
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// The register, this patch clobbers, is previously used for the StringBuilder,
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// later on a new StringBuilder is instantiated on it.
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val stringBuilderRegister = clobberedRegister
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val stringBuilderRegister = free
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val identifierRegister = instruction(ReadComponentIdentifierFingerprint.patternScanEndIndex).oneRegisterA
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val identifierRegister =
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instruction<OneRegisterInstruction>(ReadComponentIdentifierFingerprint.patternScanEndIndex).registerA
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// Parameter that holds a ref to a type with a field that ref the protobuf buffer object.
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val protobufParameterNumber = 3
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// Get the field that stores an protobuf buffer required below.
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val protobufBufferRefTypeRefFieldDescriptor =
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instruction(ProtobufBufferFingerprint.patternScanStartIndex).descriptor
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val protobufBufferRefTypeDescriptor =
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instruction(ProtobufBufferFingerprint.patternScanEndIndex - 1).descriptor
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val protobufBufferFieldDescriptor = "$protobufBufferRefTypeDescriptor->b:Ljava/nio/ByteBuffer;"
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addInstructions(
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insertHookIndex, // right after setting the component.pathBuilder field,
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insertHookIndex, // right after setting the component.pathBuilder field.
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"""
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invoke-static {v$stringBuilderRegister, v$identifierRegister}, Lapp/revanced/integrations/patches/LithoFilterPatch;->filter(Ljava/lang/StringBuilder;Ljava/lang/String;)Z
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move-result v$clobberedRegister
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if-eqz v$clobberedRegister, :not_an_ad
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move-object/from16 v$clobberedRegister, p1
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invoke-static {v$clobberedRegister}, $builderMethodDescriptor
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move-result-object v$clobberedRegister
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iget-object v$clobberedRegister, v$clobberedRegister, $emptyComponentFieldDescriptor
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return-object v$clobberedRegister
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# Get the protobuf buffer object.
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move-object/from16 v$free2, p$protobufParameterNumber
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iget-object v$free2, v$free2, $protobufBufferRefTypeRefFieldDescriptor
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check-cast v$free2, $protobufBufferRefTypeDescriptor
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# Register "free" now holds the protobuf buffer object
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iget-object v$free2, v$free2, $protobufBufferFieldDescriptor
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# Invoke the filter method.
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invoke-static { v$stringBuilderRegister, v$identifierRegister, v$free2 }, $FILTER_METHOD_DESCRIPTOR
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move-result v$free
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if-eqz v$free, :not_an_ad
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# If the filter method returned true, then return a replacement empty component.
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move-object/from16 v$free, p1
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invoke-static {v$free}, $builderMethodDescriptor
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move-result-object v$free
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iget-object v$free, v$free, $emptyComponentFieldDescriptor
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return-object v$free
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""",
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listOf(ExternalLabel("not_an_ad", instruction(insertHookIndex)))
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)
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@ -75,16 +106,20 @@ class LithoFilterPatch : BytecodePatch(
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}
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private companion object {
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private val MethodFingerprint.patternScanResult
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get() = result!!.scanResult.patternScanResult!!
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val MethodFingerprint.patternScanEndIndex
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get() = result!!.scanResult.patternScanResult!!.endIndex
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get() = patternScanResult.endIndex
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val MethodFingerprint.patternScanStartIndex
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get() = patternScanResult.startIndex
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val Instruction.descriptor
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get() = (this as ReferenceInstruction).reference.toString()
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val Instruction.oneRegisterA
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get() = (this as OneRegisterInstruction).registerA
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val Instruction.twoRegisterA
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get() = (this as TwoRegisterInstruction).registerA
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const val FILTER_METHOD_DESCRIPTOR =
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"Lapp/revanced/integrations/patches/litho/LithoFilterPatch;" +
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"->filter(Ljava/lang/StringBuilder;Ljava/lang/String;Ljava/nio/ByteBuffer;)Z"
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}
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}
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