From 4e713b53f8a676a023f657b28a0c9356e73ad8fd Mon Sep 17 00:00:00 2001
From: Graham <gpe@openrs2.org>
Date: Sat, 3 Apr 2021 11:39:12 +0100
Subject: [PATCH] Make T3 errors non-fatal

Signed-off-by: Graham <gpe@openrs2.org>
---
 .../org/openrs2/patcher/PatcherModule.kt      |   2 +
 .../transform/InvalidKeyTransformer.kt        | 102 ++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100644 patcher/src/main/kotlin/org/openrs2/patcher/transform/InvalidKeyTransformer.kt

diff --git a/patcher/src/main/kotlin/org/openrs2/patcher/PatcherModule.kt b/patcher/src/main/kotlin/org/openrs2/patcher/PatcherModule.kt
index e3ed3ab5c6..d3f100baa1 100644
--- a/patcher/src/main/kotlin/org/openrs2/patcher/PatcherModule.kt
+++ b/patcher/src/main/kotlin/org/openrs2/patcher/PatcherModule.kt
@@ -10,6 +10,7 @@ import org.openrs2.patcher.transform.CachePathTransformer
 import org.openrs2.patcher.transform.DomainTransformer
 import org.openrs2.patcher.transform.HighDpiTransformer
 import org.openrs2.patcher.transform.HostCheckTransformer
+import org.openrs2.patcher.transform.InvalidKeyTransformer
 import org.openrs2.patcher.transform.LoadLibraryTransformer
 import org.openrs2.patcher.transform.MacResizeTransformer
 import org.openrs2.patcher.transform.MemoryAllocationTransformer
@@ -38,5 +39,6 @@ public object PatcherModule : AbstractModule() {
         binder.addBinding().to(RightClickTransformer::class.java)
         binder.addBinding().to(TypoTransformer::class.java)
         binder.addBinding().to(HighDpiTransformer::class.java)
+        binder.addBinding().to(InvalidKeyTransformer::class.java)
     }
 }
diff --git a/patcher/src/main/kotlin/org/openrs2/patcher/transform/InvalidKeyTransformer.kt b/patcher/src/main/kotlin/org/openrs2/patcher/transform/InvalidKeyTransformer.kt
new file mode 100644
index 0000000000..663487e6d6
--- /dev/null
+++ b/patcher/src/main/kotlin/org/openrs2/patcher/transform/InvalidKeyTransformer.kt
@@ -0,0 +1,102 @@
+package org.openrs2.patcher.transform
+
+import com.github.michaelbull.logging.InlineLogger
+import org.objectweb.asm.Opcodes
+import org.objectweb.asm.tree.ClassNode
+import org.objectweb.asm.tree.FieldInsnNode
+import org.objectweb.asm.tree.InsnList
+import org.objectweb.asm.tree.InsnNode
+import org.objectweb.asm.tree.IntInsnNode
+import org.objectweb.asm.tree.JumpInsnNode
+import org.objectweb.asm.tree.LdcInsnNode
+import org.objectweb.asm.tree.MethodInsnNode
+import org.objectweb.asm.tree.MethodNode
+import org.objectweb.asm.tree.VarInsnNode
+import org.openrs2.asm.InsnMatcher
+import org.openrs2.asm.classpath.ClassPath
+import org.openrs2.asm.classpath.Library
+import org.openrs2.asm.transform.Transformer
+import javax.inject.Singleton
+
+@Singleton
+public class InvalidKeyTransformer : Transformer() {
+    private var catchBlocks = 0
+
+    override fun preTransform(classPath: ClassPath) {
+        catchBlocks = 0
+    }
+
+    override fun transformCode(classPath: ClassPath, library: Library, clazz: ClassNode, method: MethodNode): Boolean {
+        for (match in MATCHER.match(method)) {
+            val ldc = if (match[8] is LdcInsnNode) {
+                match[8]
+            } else {
+                match[9]
+            } as LdcInsnNode
+
+            if (ldc.cst != "T3 - ") {
+                continue
+            }
+
+            val uncompressedStore = match[2] as VarInsnNode
+            val goto = match[3] as JumpInsnNode
+            val exLoad = match[5]
+            val invokeWrap = match[match.size - 2]
+            val exThrow = match[match.size - 1]
+
+            /*
+             * Replace:
+             *
+             *     } catch (RuntimeException ex) {
+             *         throw TracingException.wrap(ex, "T3 - " + ...);
+             *     }
+             *
+             * with:
+             *
+             *     } catch (RuntimeException ex) {
+             *         System.out.println("T3 - " + ...);
+             *         uncompressed = new byte[] { 0, 0, 0, 0, 1, 1 };
+             *     }
+             */
+            val list = InsnList()
+
+            list.add(FieldInsnNode(Opcodes.GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;"))
+            list.add(InsnNode(Opcodes.SWAP))
+            list.add(MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V"))
+
+            list.add(IntInsnNode(Opcodes.BIPUSH, 6))
+            list.add(IntInsnNode(Opcodes.NEWARRAY, Opcodes.T_BYTE))
+
+            list.add(InsnNode(Opcodes.DUP))
+            list.add(InsnNode(Opcodes.ICONST_0))
+            list.add(InsnNode(Opcodes.ICONST_0))
+            list.add(InsnNode(Opcodes.BASTORE))
+
+            list.add(VarInsnNode(Opcodes.ASTORE, uncompressedStore.`var`))
+            list.add(JumpInsnNode(Opcodes.GOTO, goto.label))
+
+            method.instructions.remove(exLoad)
+            method.instructions.insertBefore(invokeWrap, list)
+            method.instructions.remove(invokeWrap)
+            method.instructions.remove(exThrow)
+
+            catchBlocks++
+        }
+
+        return false
+    }
+
+    override fun postTransform(classPath: ClassPath) {
+        logger.info { "Made $catchBlocks invalid key catch blocks non-fatal" }
+    }
+
+    private companion object {
+        private val logger = InlineLogger()
+
+        private val MATCHER = InsnMatcher.compile(
+            """
+            ALOAD INVOKESTATIC ASTORE GOTO ASTORE ALOAD NEW DUP INVOKESPECIAL? LDC .*? INVOKESTATIC ATHROW
+        """.trimIndent()
+        )
+    }
+}