From 7c427316a675cbe7e81a04294781c59f2606239d Mon Sep 17 00:00:00 2001
From: zaaarf <zaaarf@proton.me>
Date: Sun, 11 Jun 2023 14:48:24 +0200
Subject: feat: initial implementation, created interface and moved stuff from
 processor

---
 .../java/ftbsc/lll/mapper/tools/MappingUtils.java  | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 src/main/java/ftbsc/lll/mapper/tools/MappingUtils.java

(limited to 'src/main/java/ftbsc/lll/mapper/tools/MappingUtils.java')

diff --git a/src/main/java/ftbsc/lll/mapper/tools/MappingUtils.java b/src/main/java/ftbsc/lll/mapper/tools/MappingUtils.java
new file mode 100644
index 0000000..918052a
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/tools/MappingUtils.java
@@ -0,0 +1,56 @@
+package ftbsc.lll.mapper.tools;
+
+import ftbsc.lll.exceptions.MappingNotFoundException;
+import ftbsc.lll.mapper.IMapper;
+import ftbsc.lll.tools.DescriptorBuilder;
+import org.objectweb.asm.Type;
+
+public class MappingUtils {
+	/**
+	 * Obfuscates a method descriptor, replacing its class references
+	 * with their obfuscated counterparts.
+	 * @param descriptor a {@link String} containing the descriptor
+	 * @return the obfuscated descriptor
+	 */
+	public static String obfuscateMethodDescriptor(String descriptor, IMapper mapper) {
+		Type method = Type.getMethodType(descriptor);
+		Type[] arguments = method.getArgumentTypes();
+		Type returnType = method.getReturnType();
+
+		Type[] obfArguments = new Type[arguments.length];
+		for(int i = 0; i < obfArguments.length; i++)
+			obfArguments[i] = obfuscateType(arguments[i], mapper);
+
+		return Type.getMethodDescriptor(obfuscateType(returnType, mapper), obfArguments);
+	}
+
+	/**
+	 * Given a {@link Type} and a valid {@link IMapper} it returns its obfuscated
+	 * counterpart.
+	 * @param type the type in question
+	 * @return the obfuscated type
+	 */
+	public static Type obfuscateType(Type type, IMapper mapper) {
+		//unwrap arrays
+		Type unwrapped = type;
+		int arrayLevel = 0;
+		while(unwrapped.getSort() == Type.ARRAY) {
+			unwrapped = unwrapped.getElementType();
+			arrayLevel++;
+		}
+
+		//if it's a primitive no operation is needed
+		if(type.getSort() < Type.ARRAY)
+			return type;
+
+		String internalName = type.getInternalName();
+
+		String internalNameObf;
+		try {
+			internalNameObf = mapper.obfuscateClass(internalName);
+			return Type.getType(DescriptorBuilder.nameToDescriptor(internalNameObf, arrayLevel));
+		} catch(MappingNotFoundException e) {
+			return type;
+		}
+	}
+}
-- 
cgit v1.2.3-56-ga3b1