diff --git a/asm/src/main/java/dev/openrs2/asm/classpath/Library.kt b/asm/src/main/java/dev/openrs2/asm/classpath/Library.kt
index d7a9a3cb..9aee6005 100644
--- a/asm/src/main/java/dev/openrs2/asm/classpath/Library.kt
+++ b/asm/src/main/java/dev/openrs2/asm/classpath/Library.kt
@@ -1,30 +1,13 @@
 package dev.openrs2.asm.classpath
 
-import com.github.michaelbull.logging.InlineLogger
-import dev.openrs2.asm.ClassVersionUtils
-import dev.openrs2.asm.NopClassVisitor
 import dev.openrs2.asm.remap
-import dev.openrs2.compress.gzip.Gzip
-import dev.openrs2.crypto.Pkcs12KeyStore
-import dev.openrs2.util.io.DeterministicJarOutputStream
-import org.objectweb.asm.ClassReader
-import org.objectweb.asm.ClassWriter
-import org.objectweb.asm.Opcodes
 import org.objectweb.asm.commons.Remapper
 import org.objectweb.asm.tree.ClassNode
-import org.objectweb.asm.util.CheckClassAdapter
-import java.io.OutputStream
-import java.nio.file.Files
-import java.nio.file.Path
 import java.util.TreeMap
-import java.util.jar.JarEntry
-import java.util.jar.JarInputStream
-import java.util.jar.JarOutputStream
-import java.util.jar.Manifest
-import java.util.jar.Pack200
 
-class Library() : Iterable<ClassNode> {
-    private var classes = TreeMap<String, ClassNode>()
+class Library(classes: Map<String, ClassNode> = emptyMap()) : Iterable<ClassNode> {
+
+    private var classes = TreeMap(classes)
 
     constructor(library: Library) : this() {
         for (clazz in library.classes.values) {
@@ -61,125 +44,4 @@ class Library() : Iterable<ClassNode> {
 
         classes = classes.mapKeysTo(TreeMap()) { (_, clazz) -> clazz.name }
     }
-
-    fun writeJar(classPath: ClassPath, path: Path, manifest: Manifest? = null) {
-        logger.info { "Writing jar $path" }
-
-        Files.newOutputStream(path).use {
-            writeJar(classPath, it, manifest)
-        }
-    }
-
-    fun writeJar(classPath: ClassPath, out: OutputStream, manifest: Manifest? = null) {
-        DeterministicJarOutputStream.create(out, manifest).use { jar ->
-            for (clazz in classes.values) {
-                val writer = if (ClassVersionUtils.gte(clazz.version, Opcodes.V1_7)) {
-                    StackFrameClassWriter(classPath)
-                } else {
-                    ClassWriter(ClassWriter.COMPUTE_MAXS)
-                }
-
-                clazz.accept(writer)
-
-                jar.putNextEntry(JarEntry(clazz.name + CLASS_SUFFIX))
-                jar.write(writer.toByteArray())
-
-                /*
-                 * XXX(gpe): CheckClassAdapter breaks the Label offset
-                 * calculation in the OriginalPcTable's write method, so we do
-                 * a second pass without any attributes to check the class,
-                 * feeding the callbacks into a no-op visitor.
-                 */
-                for (method in clazz.methods) {
-                    method.attrs?.clear()
-                }
-                clazz.accept(CheckClassAdapter(NopClassVisitor, true))
-            }
-        }
-    }
-
-    fun writeSignedJar(classPath: ClassPath, path: Path, keyStore: Pkcs12KeyStore, manifest: Manifest? = null) {
-        logger.info { "Writing signed jar $path" }
-
-        val unsignedPath = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
-        try {
-            writeJar(classPath, unsignedPath, manifest)
-
-            val signedPath = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
-            try {
-                keyStore.signJar(unsignedPath, signedPath)
-                DeterministicJarOutputStream.repack(signedPath, path)
-            } finally {
-                Files.deleteIfExists(signedPath)
-            }
-        } finally {
-            Files.deleteIfExists(unsignedPath)
-        }
-    }
-
-    fun writePack(classPath: ClassPath, out: OutputStream) {
-        val temp = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
-        try {
-            writeJar(classPath, temp)
-
-            JarInputStream(Files.newInputStream(temp)).use { `in` ->
-                Gzip.createHeaderlessOutputStream(out).use { gzip ->
-                    Pack200.newPacker().pack(`in`, gzip)
-                }
-            }
-        } finally {
-            Files.deleteIfExists(temp)
-        }
-    }
-
-    fun writeJs5(classPath: ClassPath, out: OutputStream) {
-        // TODO(gpe): implement
-    }
-
-    companion object {
-        private val logger = InlineLogger()
-        private const val CLASS_SUFFIX = ".class"
-        private const val TEMP_PREFIX = "tmp"
-        private const val JAR_SUFFIX = ".jar"
-
-        fun readJar(path: Path): Library {
-            logger.info { "Reading jar $path" }
-
-            val library = Library()
-
-            JarInputStream(Files.newInputStream(path)).use { `in` ->
-                while (true) {
-                    val entry = `in`.nextJarEntry ?: break
-                    if (!entry.name.endsWith(CLASS_SUFFIX)) {
-                        continue
-                    }
-
-                    val clazz = ClassNode()
-                    val reader = ClassReader(`in`)
-                    reader.accept(JsrInliner(clazz), ClassReader.SKIP_DEBUG or ClassReader.SKIP_FRAMES)
-
-                    library.add(clazz)
-                }
-            }
-
-            return library
-        }
-
-        fun readPack(path: Path): Library {
-            logger.info { "Reading pack $path" }
-
-            val temp = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
-            try {
-                Gzip.createHeaderlessInputStream(Files.newInputStream(path)).use { `in` ->
-                    JarOutputStream(Files.newOutputStream(temp)).use { out ->
-                        Pack200.newUnpacker().unpack(`in`, out)
-                    }
-                }
-
-                return readJar(temp)
-            } finally {
-                Files.deleteIfExists(temp)
-            }
-        }
-    }
 }
diff --git a/asm/src/main/java/dev/openrs2/asm/io/JarLibraryReader.kt b/asm/src/main/java/dev/openrs2/asm/io/JarLibraryReader.kt
new file mode 100644
index 00000000..65b8d71a
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/io/JarLibraryReader.kt
@@ -0,0 +1,35 @@
+package dev.openrs2.asm.io
+
+import dev.openrs2.asm.classpath.JsrInliner
+import dev.openrs2.asm.classpath.Library
+import org.objectweb.asm.ClassReader
+import org.objectweb.asm.tree.ClassNode
+import java.util.jar.JarEntry
+import java.util.jar.JarInputStream
+
+class JarLibraryReader(private val input: JarInputStream) : LibraryReader {
+
+    override fun read(): Library {
+        val classes = generateSequence { input.nextJarEntry }
+            .filter(::isClass)
+            .map { input.readClass() }
+            .associateBy(ClassNode::name)
+
+        return Library(classes)
+    }
+
+    private fun isClass(entry: JarEntry): Boolean {
+        return entry.name.endsWith(CLASS_SUFFIX)
+    }
+
+    private fun JarInputStream.readClass(): ClassNode {
+        val clazz = ClassNode()
+        val reader = ClassReader(this)
+        reader.accept(JsrInliner(clazz), ClassReader.SKIP_DEBUG or ClassReader.SKIP_FRAMES)
+        return clazz
+    }
+
+    private companion object {
+        private const val CLASS_SUFFIX = ".class"
+    }
+}
diff --git a/asm/src/main/java/dev/openrs2/asm/io/JarLibraryWriter.kt b/asm/src/main/java/dev/openrs2/asm/io/JarLibraryWriter.kt
new file mode 100644
index 00000000..63468157
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/io/JarLibraryWriter.kt
@@ -0,0 +1,45 @@
+package dev.openrs2.asm.io
+
+import dev.openrs2.asm.ClassVersionUtils
+import dev.openrs2.asm.NopClassVisitor
+import dev.openrs2.asm.classpath.ClassPath
+import dev.openrs2.asm.classpath.Library
+import dev.openrs2.asm.classpath.StackFrameClassWriter
+import org.objectweb.asm.ClassWriter
+import org.objectweb.asm.Opcodes
+import org.objectweb.asm.util.CheckClassAdapter
+import java.util.jar.JarEntry
+import java.util.jar.JarOutputStream
+
+class JarLibraryWriter(private val output: JarOutputStream) : LibraryWriter {
+
+    override fun write(classPath: ClassPath, library: Library) {
+        for (clazz in library) {
+            val writer = if (ClassVersionUtils.gte(clazz.version, Opcodes.V1_7)) {
+                StackFrameClassWriter(classPath)
+            } else {
+                ClassWriter(ClassWriter.COMPUTE_MAXS)
+            }
+
+            clazz.accept(writer)
+
+            output.putNextEntry(JarEntry(clazz.name + CLASS_SUFFIX))
+            output.write(writer.toByteArray())
+
+            /*
+             * XXX(gpe): CheckClassAdapter breaks the Label offset
+             * calculation in the OriginalPcTable's write method, so we do
+             * a second pass without any attributes to check the class,
+             * feeding the callbacks into a no-op visitor.
+             */
+            for (method in clazz.methods) {
+                method.attrs?.clear()
+            }
+            clazz.accept(CheckClassAdapter(NopClassVisitor, true))
+        }
+    }
+
+    private companion object {
+        private const val CLASS_SUFFIX = ".class"
+    }
+}
diff --git a/asm/src/main/java/dev/openrs2/asm/io/Js5LibraryWriter.kt b/asm/src/main/java/dev/openrs2/asm/io/Js5LibraryWriter.kt
new file mode 100644
index 00000000..d5fe1867
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/io/Js5LibraryWriter.kt
@@ -0,0 +1,12 @@
+package dev.openrs2.asm.io
+
+import dev.openrs2.asm.classpath.ClassPath
+import dev.openrs2.asm.classpath.Library
+import java.io.OutputStream
+
+class Js5LibraryWriter(private val output: OutputStream) : LibraryWriter {
+
+    override fun write(classPath: ClassPath, library: Library) {
+        // TODO(gpe): implement
+    }
+}
diff --git a/asm/src/main/java/dev/openrs2/asm/io/LibraryReader.kt b/asm/src/main/java/dev/openrs2/asm/io/LibraryReader.kt
new file mode 100644
index 00000000..05b9638b
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/io/LibraryReader.kt
@@ -0,0 +1,7 @@
+package dev.openrs2.asm.io
+
+import dev.openrs2.asm.classpath.Library
+
+interface LibraryReader {
+    fun read(): Library
+}
diff --git a/asm/src/main/java/dev/openrs2/asm/io/LibraryWriter.kt b/asm/src/main/java/dev/openrs2/asm/io/LibraryWriter.kt
new file mode 100644
index 00000000..b04ee79f
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/io/LibraryWriter.kt
@@ -0,0 +1,8 @@
+package dev.openrs2.asm.io
+
+import dev.openrs2.asm.classpath.ClassPath
+import dev.openrs2.asm.classpath.Library
+
+interface LibraryWriter {
+    fun write(classPath: ClassPath, library: Library)
+}
diff --git a/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryReader.kt b/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryReader.kt
new file mode 100644
index 00000000..0919640e
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryReader.kt
@@ -0,0 +1,35 @@
+package dev.openrs2.asm.io
+
+import dev.openrs2.asm.classpath.Library
+import dev.openrs2.compress.gzip.Gzip
+import java.io.InputStream
+import java.nio.file.Files
+import java.util.jar.JarInputStream
+import java.util.jar.JarOutputStream
+import java.util.jar.Pack200
+
+class Pack200LibraryReader(private val input: InputStream) : LibraryReader {
+
+    override fun read(): Library {
+        val temp = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
+
+        try {
+            Gzip.createHeaderlessInputStream(input).use { gzipInput ->
+                JarOutputStream(Files.newOutputStream(temp)).use { output ->
+                    Pack200.newUnpacker().unpack(gzipInput, output)
+                }
+            }
+
+            return JarInputStream(Files.newInputStream(temp)).use { tempInput ->
+                JarLibraryReader(tempInput).read()
+            }
+        } finally {
+            Files.deleteIfExists(temp)
+        }
+    }
+
+    private companion object {
+        private const val TEMP_PREFIX = "tmp"
+        private const val JAR_SUFFIX = ".jar"
+    }
+}
diff --git a/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryWriter.kt b/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryWriter.kt
new file mode 100644
index 00000000..a04573f5
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryWriter.kt
@@ -0,0 +1,36 @@
+package dev.openrs2.asm.io
+
+import dev.openrs2.asm.classpath.ClassPath
+import dev.openrs2.asm.classpath.Library
+import dev.openrs2.compress.gzip.Gzip
+import dev.openrs2.util.io.DeterministicJarOutputStream
+import java.io.OutputStream
+import java.nio.file.Files
+import java.util.jar.JarInputStream
+import java.util.jar.Pack200
+
+class Pack200LibraryWriter(private val output: OutputStream) : LibraryWriter {
+
+    override fun write(classPath: ClassPath, library: Library) {
+        val tempJar = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
+
+        try {
+            DeterministicJarOutputStream(Files.newOutputStream(tempJar)).use { tempOutput ->
+                JarLibraryWriter(tempOutput).write(classPath, library)
+            }
+
+            JarInputStream(Files.newInputStream(tempJar)).use { input ->
+                Gzip.createHeaderlessOutputStream(output).use { gzip ->
+                    Pack200.newPacker().pack(input, gzip)
+                }
+            }
+        } finally {
+            Files.deleteIfExists(tempJar)
+        }
+    }
+
+    private companion object {
+        private const val TEMP_PREFIX = "tmp"
+        private const val JAR_SUFFIX = ".jar"
+    }
+}
diff --git a/asm/src/main/java/dev/openrs2/asm/io/SignedJarLibraryWriter.kt b/asm/src/main/java/dev/openrs2/asm/io/SignedJarLibraryWriter.kt
new file mode 100644
index 00000000..74beea12
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/io/SignedJarLibraryWriter.kt
@@ -0,0 +1,54 @@
+package dev.openrs2.asm.io
+
+import dev.openrs2.asm.classpath.ClassPath
+import dev.openrs2.asm.classpath.Library
+import dev.openrs2.crypto.Pkcs12KeyStore
+import dev.openrs2.util.io.DeterministicJarOutputStream
+import java.io.OutputStream
+import java.nio.file.Files
+import java.nio.file.Path
+import java.util.jar.JarInputStream
+import java.util.jar.Manifest
+
+class SignedJarLibraryWriter(
+    private val output: OutputStream,
+    private val manifest: Manifest,
+    private val keyStore: Pkcs12KeyStore
+) : LibraryWriter {
+
+    override fun write(classPath: ClassPath, library: Library) {
+        val unsignedJar = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
+
+        try {
+            DeterministicJarOutputStream(Files.newOutputStream(unsignedJar), manifest).use { unsignedOutput ->
+                JarLibraryWriter(unsignedOutput).write(classPath, library)
+            }
+
+            val signedJar = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
+            try {
+                keyStore.signJar(unsignedJar, signedJar)
+                repack(signedJar)
+            } finally {
+                Files.deleteIfExists(signedJar)
+            }
+        } finally {
+            Files.deleteIfExists(unsignedJar)
+        }
+    }
+
+    private fun repack(signedJar: Path) {
+        JarInputStream(Files.newInputStream(signedJar)).use { input ->
+            DeterministicJarOutputStream(output, input.manifest).use { output ->
+                generateSequence { input.nextJarEntry }.forEach {
+                    output.putNextEntry(it)
+                    input.copyTo(output)
+                }
+            }
+        }
+    }
+
+    private companion object {
+        private const val TEMP_PREFIX = "tmp"
+        private const val JAR_SUFFIX = ".jar"
+    }
+}
diff --git a/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt b/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt
index 7a664f15..264277b3 100644
--- a/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt
+++ b/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt
@@ -3,6 +3,10 @@ package dev.openrs2.bundler
 import com.github.michaelbull.logging.InlineLogger
 import dev.openrs2.asm.classpath.ClassPath
 import dev.openrs2.asm.classpath.Library
+import dev.openrs2.asm.io.JarLibraryReader
+import dev.openrs2.asm.io.JarLibraryWriter
+import dev.openrs2.asm.io.Pack200LibraryReader
+import dev.openrs2.asm.io.SignedJarLibraryWriter
 import dev.openrs2.bundler.transform.BufferSizeTransformer
 import dev.openrs2.bundler.transform.CachePathTransformer
 import dev.openrs2.bundler.transform.HostCheckTransformer
@@ -14,9 +18,12 @@ import dev.openrs2.bundler.transform.ResourceTransformer
 import dev.openrs2.bundler.transform.RightClickTransformer
 import dev.openrs2.bundler.transform.TypoTransformer
 import dev.openrs2.crypto.Pkcs12KeyStore
+import dev.openrs2.util.io.DeterministicJarOutputStream
+import java.nio.file.Files
 import java.nio.file.Path
 import java.util.jar.Attributes
 import java.util.jar.Attributes.Name.MANIFEST_VERSION
+import java.util.jar.JarInputStream
 import java.util.jar.Manifest
 import javax.inject.Inject
 import javax.inject.Singleton
@@ -28,12 +35,12 @@ class Bundler @Inject constructor(publicKeyTransformer: PublicKeyTransformer) {
     fun run(input: Path, output: Path, keyStorePath: Path) {
         // read input jars/packs
         logger.info { "Reading input jars" }
-        val unpacker = Library.readJar(input.resolve("unpackclass.pack"))
-        val loader = Library.readJar(input.resolve("loader.jar"))
-        val glLoader = Library.readJar(input.resolve("loader_gl.jar"))
-        val gl = Library.readPack(input.resolve("jaggl.pack200"))
-        val client = Library.readJar(input.resolve("runescape.jar"))
-        val glClient = Library.readPack(input.resolve("runescape_gl.pack200"))
+        val unpacker = readJar(input.resolve("unpackclass.pack"))
+        val loader = readJar(input.resolve("loader.jar"))
+        val glLoader = readJar(input.resolve("loader_gl.jar"))
+        val gl = readPack(input.resolve("jaggl.pack200"))
+        val client = readJar(input.resolve("runescape.jar"))
+        val glClient = readPack(input.resolve("runescape_gl.pack200"))
 
         // bundle libraries together into a common classpath
         val runtime = ClassLoader.getPlatformClassLoader()
@@ -109,11 +116,43 @@ class Bundler @Inject constructor(publicKeyTransformer: PublicKeyTransformer) {
         }
 
         // write unsigned client and loaders
-        client.writeJar(classPath, output.resolve("runescape.jar"), unsignedManifest)
+        writeJar(classPath, client, output.resolve("runescape.jar"))
 
         val keyStore = Pkcs12KeyStore.open(keyStorePath)
-        loader.writeSignedJar(classPath, output.resolve("loader.jar"), keyStore, signedManifest)
-        glLoader.writeSignedJar(glClassPath, output.resolve("loader_gl.jar"), keyStore, signedManifest)
+        writeSignedJar(classPath, loader, output.resolve("loader.jar"), keyStore)
+        writeSignedJar(glClassPath, glLoader, output.resolve("loader_gl.jar"), keyStore)
+    }
+
+    private fun readJar(path: Path): Library {
+        logger.info { "Reading jar $path" }
+
+        return JarInputStream(Files.newInputStream(path)).use { input ->
+            JarLibraryReader(input).read()
+        }
+    }
+
+    private fun readPack(path: Path): Library {
+        logger.info { "Reading pack $path" }
+
+        return Files.newInputStream(path).use { input ->
+            Pack200LibraryReader(input).read()
+        }
+    }
+
+    private fun writeJar(classPath: ClassPath, library: Library, path: Path) {
+        logger.info { "Writing jar $path" }
+
+        DeterministicJarOutputStream(Files.newOutputStream(path), unsignedManifest).use { output ->
+            JarLibraryWriter(output).write(classPath, library)
+        }
+    }
+
+    private fun writeSignedJar(classPath: ClassPath, library: Library, path: Path, keyStore: Pkcs12KeyStore) {
+        logger.info { "Writing signed jar $path" }
+
+        Files.newOutputStream(path).use {
+            SignedJarLibraryWriter(it, signedManifest, keyStore).write(classPath, library)
+        }
     }
 
     companion object {
diff --git a/bundler/src/main/java/dev/openrs2/bundler/Resource.kt b/bundler/src/main/java/dev/openrs2/bundler/Resource.kt
index 4ed7e5d6..d49a3b94 100644
--- a/bundler/src/main/java/dev/openrs2/bundler/Resource.kt
+++ b/bundler/src/main/java/dev/openrs2/bundler/Resource.kt
@@ -3,6 +3,10 @@ package dev.openrs2.bundler
 import com.github.michaelbull.logging.InlineLogger
 import dev.openrs2.asm.classpath.ClassPath
 import dev.openrs2.asm.classpath.Library
+import dev.openrs2.asm.io.JarLibraryWriter
+import dev.openrs2.asm.io.Js5LibraryWriter
+import dev.openrs2.asm.io.Pack200LibraryWriter
+import dev.openrs2.util.io.DeterministicJarOutputStream
 import java.io.ByteArrayOutputStream
 import java.nio.file.Files
 import java.nio.file.Path
@@ -66,23 +70,26 @@ class Resource(
         }
 
         fun compressJar(source: String, destination: String, classPath: ClassPath, library: Library): Resource {
-            ByteArrayOutputStream().use { out ->
-                library.writeJar(classPath, out)
-                return compress(source, destination, out.toByteArray())
+            ByteArrayOutputStream().use { output ->
+                DeterministicJarOutputStream(output).use { jarOutput ->
+                    JarLibraryWriter(jarOutput).write(classPath, library)
+                }
+
+                return compress(source, destination, output.toByteArray())
             }
         }
 
         fun compressPack(source: String, destination: String, classPath: ClassPath, library: Library): Resource {
-            ByteArrayOutputStream().use { out ->
-                library.writePack(classPath, out)
-                return compress(source, destination, out.toByteArray())
+            ByteArrayOutputStream().use { output ->
+                Pack200LibraryWriter(output).write(classPath, library)
+                return compress(source, destination, output.toByteArray())
             }
         }
 
         fun compressJs5(source: String, destination: String, classPath: ClassPath, library: Library): Resource {
-            ByteArrayOutputStream().use { out ->
-                library.writeJs5(classPath, out)
-                return compress(source, destination, out.toByteArray())
+            ByteArrayOutputStream().use { output ->
+                Js5LibraryWriter(output).write(classPath, library)
+                return compress(source, destination, output.toByteArray())
             }
         }
 
diff --git a/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt b/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
index 338793bd..c380c4e3 100644
--- a/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
+++ b/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
@@ -3,8 +3,9 @@ package dev.openrs2.deob
 import com.github.michaelbull.logging.InlineLogger
 import dev.openrs2.asm.classpath.ClassPath
 import dev.openrs2.asm.classpath.Library
-import dev.openrs2.asm.classpath.Library.Companion.readJar
-import dev.openrs2.asm.classpath.Library.Companion.readPack
+import dev.openrs2.asm.io.JarLibraryReader
+import dev.openrs2.asm.io.JarLibraryWriter
+import dev.openrs2.asm.io.Pack200LibraryReader
 import dev.openrs2.bundler.Bundler
 import dev.openrs2.bundler.transform.ResourceTransformer
 import dev.openrs2.deob.SignedClassUtils.move
@@ -36,8 +37,10 @@ import dev.openrs2.deob.transform.UnusedArgTransformer
 import dev.openrs2.deob.transform.UnusedLocalTransformer
 import dev.openrs2.deob.transform.UnusedMethodTransformer
 import dev.openrs2.deob.transform.VisibilityTransformer
+import dev.openrs2.util.io.DeterministicJarOutputStream
 import java.nio.file.Files
 import java.nio.file.Path
+import java.util.jar.JarInputStream
 
 class Deobfuscator(private val input: Path, private val output: Path) {
     fun run() {
@@ -124,20 +127,44 @@ class Deobfuscator(private val input: Path, private val output: Path) {
 
         Files.createDirectories(output)
 
-        client.writeJar(classPath, output.resolve("runescape.jar"))
-        loader.writeJar(classPath, output.resolve("loader.jar"))
-        signLink.writeJar(classPath, output.resolve("signlink.jar"))
-        unpack.writeJar(classPath, output.resolve("unpack.jar"))
-        unpackClass.writeJar(classPath, output.resolve("unpackclass.jar"))
+        writeJar(classPath, client, output.resolve("runescape.jar"))
+        writeJar(classPath, loader, output.resolve("loader.jar"))
+        writeJar(classPath, signLink, output.resolve("signlink.jar"))
+        writeJar(classPath, unpack, output.resolve("unpack.jar"))
+        writeJar(classPath, unpackClass, output.resolve("unpackclass.jar"))
 
-        gl.writeJar(glClassPath, output.resolve("jaggl.jar"))
-        glClient.writeJar(glClassPath, output.resolve("runescape_gl.jar"))
-        glLoader.writeJar(glClassPath, output.resolve("loader_gl.jar"))
-        glSignLink.writeJar(glClassPath, output.resolve("signlink_gl.jar"))
-        glUnpack.writeJar(glClassPath, output.resolve("unpack_gl.jar"))
-        glUnpackClass.writeJar(glClassPath, output.resolve("unpackclass_gl.jar"))
+        writeJar(glClassPath, gl, output.resolve("jaggl.jar"))
+        writeJar(glClassPath, glClient, output.resolve("runescape_gl.jar"))
+        writeJar(glClassPath, glLoader, output.resolve("loader_gl.jar"))
+        writeJar(glClassPath, glSignLink, output.resolve("signlink_gl.jar"))
+        writeJar(glClassPath, glUnpack, output.resolve("unpack_gl.jar"))
+        writeJar(glClassPath, glUnpackClass, output.resolve("unpackclass_gl.jar"))
 
-        unsignedClient.writeJar(unsignedClassPath, output.resolve("runescape_unsigned.jar"))
+        writeJar(unsignedClassPath, unsignedClient, output.resolve("runescape_unsigned.jar"))
+    }
+
+    private fun readJar(path: Path): Library {
+        logger.info { "Reading jar $path" }
+
+        return JarInputStream(Files.newInputStream(path)).use { input ->
+            JarLibraryReader(input).read()
+        }
+    }
+
+    private fun readPack(path: Path): Library {
+        logger.info { "Reading pack $path" }
+
+        return Files.newInputStream(path).use { input ->
+            Pack200LibraryReader(input).read()
+        }
+    }
+
+    private fun writeJar(classPath: ClassPath, library: Library, path: Path) {
+        logger.info { "Writing jar $path" }
+
+        DeterministicJarOutputStream(Files.newOutputStream(path)).use { output ->
+            JarLibraryWriter(output).write(classPath, library)
+        }
     }
 
     companion object {
diff --git a/util/src/main/java/dev/openrs2/util/io/DeterministicJarOutputStream.kt b/util/src/main/java/dev/openrs2/util/io/DeterministicJarOutputStream.kt
index 29b658f2..f128a67d 100644
--- a/util/src/main/java/dev/openrs2/util/io/DeterministicJarOutputStream.kt
+++ b/util/src/main/java/dev/openrs2/util/io/DeterministicJarOutputStream.kt
@@ -1,17 +1,15 @@
 package dev.openrs2.util.io
 
 import java.io.OutputStream
-import java.nio.file.Files
-import java.nio.file.Path
 import java.nio.file.attribute.FileTime
-import java.util.jar.JarInputStream
 import java.util.jar.JarOutputStream
 import java.util.jar.Manifest
 import java.util.zip.ZipEntry
 
 class DeterministicJarOutputStream : JarOutputStream {
-    private constructor(out: OutputStream) : super(out)
-    private constructor(out: OutputStream, man: Manifest) : super(out, man)
+
+    constructor(out: OutputStream) : super(out)
+    constructor(out: OutputStream, man: Manifest) : super(out, man)
 
     override fun putNextEntry(ze: ZipEntry) {
         ze.creationTime = UNIX_EPOCH
@@ -22,25 +20,5 @@ class DeterministicJarOutputStream : JarOutputStream {
 
     companion object {
         private val UNIX_EPOCH = FileTime.fromMillis(0)
-
-        fun create(out: OutputStream, manifest: Manifest? = null): JarOutputStream {
-            return if (manifest != null) {
-                DeterministicJarOutputStream(out, manifest)
-            } else {
-                DeterministicJarOutputStream(out)
-            }
-        }
-
-        fun repack(src: Path, dest: Path) {
-            JarInputStream(Files.newInputStream(src)).use { input ->
-                create(Files.newOutputStream(dest), input.manifest).use { output ->
-                    while (true) {
-                        val entry = input.nextJarEntry ?: break
-                        output.putNextEntry(entry)
-                        input.copyTo(output)
-                    }
-                }
-            }
-        }
     }
 }