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 2fb5d281..5d89544d 100644
--- a/asm/src/main/java/dev/openrs2/asm/classpath/Library.kt
+++ b/asm/src/main/java/dev/openrs2/asm/classpath/Library.kt
@@ -1,8 +1,13 @@
 package dev.openrs2.asm.classpath
 
+import com.github.michaelbull.logging.InlineLogger
+import dev.openrs2.asm.io.LibraryReader
+import dev.openrs2.asm.io.LibraryWriter
 import dev.openrs2.asm.remap
 import org.objectweb.asm.commons.Remapper
 import org.objectweb.asm.tree.ClassNode
+import java.nio.file.Files
+import java.nio.file.Path
 import java.util.TreeMap
 
 class Library() : Iterable<ClassNode> {
@@ -43,4 +48,24 @@ class Library() : Iterable<ClassNode> {
 
         classes = classes.mapKeysTo(TreeMap()) { (_, clazz) -> clazz.name }
     }
+
+    fun write(path: Path, writer: LibraryWriter, classPath: ClassPath) {
+        logger.info { "Writing library $path" }
+
+        Files.newOutputStream(path).use { output ->
+            writer.write(output, classPath, this)
+        }
+    }
+
+    companion object {
+        private val logger = InlineLogger()
+
+        fun read(path: Path, reader: LibraryReader): Library {
+            logger.info { "Reading library $path" }
+
+            return Files.newInputStream(path).use { input ->
+                reader.read(input)
+            }
+        }
+    }
 }
diff --git a/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt b/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt
index 3f7d529a..aafdc46d 100644
--- a/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt
+++ b/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt
@@ -42,12 +42,12 @@ class Bundler @Inject constructor(
     fun run(input: Path, output: Path, keyStorePath: Path) {
         // read input jars/packs
         logger.info { "Reading input jars" }
-        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"))
+        val unpacker = Library.read(input.resolve("unpackclass.pack"), JarLibraryReader)
+        val loader = Library.read(input.resolve("loader.jar"), JarLibraryReader)
+        val glLoader = Library.read(input.resolve("loader_gl.jar"), JarLibraryReader)
+        val gl = Library.read(input.resolve("jaggl.pack200"), Pack200LibraryReader)
+        val client = Library.read(input.resolve("runescape.jar"), JarLibraryReader)
+        val glClient = Library.read(input.resolve("runescape_gl.pack200"), Pack200LibraryReader)
 
         // bundle libraries together into a common classpath
         val runtime = ClassLoader.getPlatformClassLoader()
@@ -139,43 +139,11 @@ class Bundler @Inject constructor(
         }
 
         // write unsigned client and loaders
-        writeJar(classPath, client, output.resolve("runescape.jar"))
+        client.write(output.resolve("runescape.jar"), ManifestJarLibraryWriter(unsignedManifest), classPath)
 
         val keyStore = Pkcs12KeyStore.open(keyStorePath, config.game)
-        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 Files.newInputStream(path).use { input ->
-            JarLibraryReader.read(input)
-        }
-    }
-
-    private fun readPack(path: Path): Library {
-        logger.info { "Reading pack $path" }
-
-        return Files.newInputStream(path).use { input ->
-            Pack200LibraryReader.read(input)
-        }
-    }
-
-    private fun writeJar(classPath: ClassPath, library: Library, path: Path) {
-        logger.info { "Writing jar $path" }
-
-        Files.newOutputStream(path).use { output ->
-            ManifestJarLibraryWriter(unsignedManifest).write(output, classPath, library)
-        }
-    }
-
-    private fun writeSignedJar(classPath: ClassPath, library: Library, path: Path, keyStore: Pkcs12KeyStore) {
-        logger.info { "Writing signed jar $path" }
-
-        Files.newOutputStream(path).use { output ->
-            SignedJarLibraryWriter(signedManifest, keyStore).write(output, classPath, library)
-        }
+        loader.write(output.resolve("loader.jar"), SignedJarLibraryWriter(signedManifest, keyStore), classPath)
+        glLoader.write(output.resolve("loader_gl.jar"), SignedJarLibraryWriter(signedManifest, keyStore), glClassPath)
     }
 
     companion object {
diff --git a/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt b/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
index a7607db5..32a7554d 100644
--- a/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
+++ b/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
@@ -20,13 +20,13 @@ class Deobfuscator @Inject constructor(
     fun run(input: Path, output: Path) {
         // read input jars/packs
         logger.info { "Reading input jars" }
-        val unpackClass = readJar(input.resolve("unpackclass.pack"))
+        val unpackClass = Library.read(input.resolve("unpackclass.pack"), JarLibraryReader)
         val glUnpackClass = Library(unpackClass)
-        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"))
+        val loader = Library.read(input.resolve("loader.jar"), JarLibraryReader)
+        val glLoader = Library.read(input.resolve("loader_gl.jar"), JarLibraryReader)
+        val gl = Library.read(input.resolve("jaggl.pack200"), Pack200LibraryReader)
+        val client = Library.read(input.resolve("runescape.jar"), JarLibraryReader)
+        val glClient = Library.read(input.resolve("runescape_gl.pack200"), Pack200LibraryReader)
 
         /*
          * TODO(gpe): it'd be nice to have separate signlink.jar and
@@ -103,44 +103,20 @@ class Deobfuscator @Inject constructor(
 
         Files.createDirectories(output)
 
-        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"))
+        client.write(output.resolve("runescape.jar"), JarLibraryWriter, classPath)
+        loader.write(output.resolve("loader.jar"), JarLibraryWriter, classPath)
+        signLink.write(output.resolve("signlink.jar"), JarLibraryWriter, classPath)
+        unpack.write(output.resolve("unpack.jar"), JarLibraryWriter, classPath)
+        unpackClass.write(output.resolve("unpackclass.jar"), JarLibraryWriter, classPath)
 
-        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"))
+        gl.write(output.resolve("jaggl.jar"), JarLibraryWriter, glClassPath)
+        glClient.write(output.resolve("runescape_gl.jar"), JarLibraryWriter, glClassPath)
+        glLoader.write(output.resolve("loader_gl.jar"), JarLibraryWriter, glClassPath)
+        glSignLink.write(output.resolve("signlink_gl.jar"), JarLibraryWriter, glClassPath)
+        glUnpack.write(output.resolve("unpack_gl.jar"), JarLibraryWriter, glClassPath)
+        glUnpackClass.write(output.resolve("unpackclass_gl.jar"), JarLibraryWriter, glClassPath)
 
-        writeJar(unsignedClassPath, unsignedClient, output.resolve("runescape_unsigned.jar"))
-    }
-
-    private fun readJar(path: Path): Library {
-        logger.info { "Reading jar $path" }
-
-        return Files.newInputStream(path).use { input ->
-            JarLibraryReader.read(input)
-        }
-    }
-
-    private fun readPack(path: Path): Library {
-        logger.info { "Reading pack $path" }
-
-        return Files.newInputStream(path).use { input ->
-            Pack200LibraryReader.read(input)
-        }
-    }
-
-    private fun writeJar(classPath: ClassPath, library: Library, path: Path) {
-        logger.info { "Writing jar $path" }
-
-        Files.newOutputStream(path).use { output ->
-            JarLibraryWriter.write(output, classPath, library)
-        }
+        unsignedClient.write(output.resolve("runescape_unsigned.jar"), JarLibraryWriter, unsignedClassPath)
     }
 
     companion object {