diff --git a/asm/src/main/java/dev/openrs2/asm/io/JarLibraryReader.kt b/asm/src/main/java/dev/openrs2/asm/io/JarLibraryReader.kt
index 187e53d9b8..9566c63b5c 100644
--- a/asm/src/main/java/dev/openrs2/asm/io/JarLibraryReader.kt
+++ b/asm/src/main/java/dev/openrs2/asm/io/JarLibraryReader.kt
@@ -5,22 +5,25 @@ import dev.openrs2.asm.classpath.Library
 import dev.openrs2.util.io.entries
 import org.objectweb.asm.ClassReader
 import org.objectweb.asm.tree.ClassNode
+import java.io.InputStream
 import java.util.jar.JarInputStream
 
-class JarLibraryReader(private val input: JarInputStream) : LibraryReader {
-    override fun read(): Library {
+class JarLibraryReader : LibraryReader {
+    override fun read(input: InputStream): Library {
         val library = Library()
 
-        for (entry in input.entries) {
-            if (!entry.name.endsWith(CLASS_SUFFIX)) {
-                continue
-            }
+        JarInputStream(input).use { jar ->
+            for (entry in jar.entries) {
+                if (!entry.name.endsWith(CLASS_SUFFIX)) {
+                    continue
+                }
 
-            val clazz = ClassNode()
-            val reader = ClassReader(input)
-            reader.accept(JsrInliner(clazz), ClassReader.SKIP_DEBUG or ClassReader.SKIP_FRAMES)
+                val clazz = ClassNode()
+                val reader = ClassReader(jar)
+                reader.accept(JsrInliner(clazz), ClassReader.SKIP_DEBUG or ClassReader.SKIP_FRAMES)
 
-            library.add(clazz)
+                library.add(clazz)
+            }
         }
 
         return library
diff --git a/asm/src/main/java/dev/openrs2/asm/io/JarLibraryWriter.kt b/asm/src/main/java/dev/openrs2/asm/io/JarLibraryWriter.kt
index a3a4a91acc..b1f91114ec 100644
--- a/asm/src/main/java/dev/openrs2/asm/io/JarLibraryWriter.kt
+++ b/asm/src/main/java/dev/openrs2/asm/io/JarLibraryWriter.kt
@@ -5,39 +5,47 @@ import dev.openrs2.asm.NopClassVisitor
 import dev.openrs2.asm.classpath.ClassPath
 import dev.openrs2.asm.classpath.Library
 import dev.openrs2.asm.classpath.StackFrameClassWriter
+import dev.openrs2.util.io.DeterministicJarOutputStream
 import org.objectweb.asm.ClassWriter
 import org.objectweb.asm.Opcodes
 import org.objectweb.asm.util.CheckClassAdapter
+import java.io.OutputStream
 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)
-            }
+open class JarLibraryWriter : LibraryWriter {
+    override fun write(output: OutputStream, classPath: ClassPath, library: Library) {
+        createJarOutputStream(output).use { jar ->
+            for (clazz in library) {
+                val writer = if (ClassVersionUtils.gte(clazz.version, Opcodes.V1_7)) {
+                    StackFrameClassWriter(classPath)
+                } else {
+                    ClassWriter(ClassWriter.COMPUTE_MAXS)
+                }
 
-            clazz.accept(writer)
+                clazz.accept(writer)
 
-            output.putNextEntry(JarEntry(clazz.name + CLASS_SUFFIX))
-            output.write(writer.toByteArray())
+                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()
+                /*
+                 * 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))
             }
-            clazz.accept(CheckClassAdapter(NopClassVisitor, true))
         }
     }
 
+    protected open fun createJarOutputStream(output: OutputStream): JarOutputStream {
+        return DeterministicJarOutputStream(output)
+    }
+
     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
index 6a70e51167..5e49969e9b 100644
--- a/asm/src/main/java/dev/openrs2/asm/io/Js5LibraryWriter.kt
+++ b/asm/src/main/java/dev/openrs2/asm/io/Js5LibraryWriter.kt
@@ -4,8 +4,8 @@ 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) {
+class Js5LibraryWriter : LibraryWriter {
+    override fun write(output: OutputStream, 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
index 05b9638bcc..444c462448 100644
--- a/asm/src/main/java/dev/openrs2/asm/io/LibraryReader.kt
+++ b/asm/src/main/java/dev/openrs2/asm/io/LibraryReader.kt
@@ -1,7 +1,8 @@
 package dev.openrs2.asm.io
 
 import dev.openrs2.asm.classpath.Library
+import java.io.InputStream
 
 interface LibraryReader {
-    fun read(): Library
+    fun read(input: InputStream): 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
index b04ee79f34..0b15095059 100644
--- a/asm/src/main/java/dev/openrs2/asm/io/LibraryWriter.kt
+++ b/asm/src/main/java/dev/openrs2/asm/io/LibraryWriter.kt
@@ -2,7 +2,8 @@ package dev.openrs2.asm.io
 
 import dev.openrs2.asm.classpath.ClassPath
 import dev.openrs2.asm.classpath.Library
+import java.io.OutputStream
 
 interface LibraryWriter {
-    fun write(classPath: ClassPath, library: Library)
+    fun write(output: OutputStream, classPath: ClassPath, library: Library)
 }
diff --git a/asm/src/main/java/dev/openrs2/asm/io/ManifestJarLibraryWriter.kt b/asm/src/main/java/dev/openrs2/asm/io/ManifestJarLibraryWriter.kt
new file mode 100644
index 0000000000..98676d1d7d
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/io/ManifestJarLibraryWriter.kt
@@ -0,0 +1,12 @@
+package dev.openrs2.asm.io
+
+import dev.openrs2.util.io.DeterministicJarOutputStream
+import java.io.OutputStream
+import java.util.jar.JarOutputStream
+import java.util.jar.Manifest
+
+class ManifestJarLibraryWriter(private val manifest: Manifest) : JarLibraryWriter() {
+    override fun createJarOutputStream(output: OutputStream): JarOutputStream {
+        return DeterministicJarOutputStream(output, manifest)
+    }
+}
diff --git a/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryReader.kt b/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryReader.kt
index 477c2e2804..b0504beb31 100644
--- a/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryReader.kt
+++ b/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryReader.kt
@@ -4,12 +4,11 @@ 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 {
+class Pack200LibraryReader : LibraryReader {
+    override fun read(input: InputStream): Library {
         val temp = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
         try {
             Gzip.createHeaderlessInputStream(input).use { gzipInput ->
@@ -18,8 +17,8 @@ class Pack200LibraryReader(private val input: InputStream) : LibraryReader {
                 }
             }
 
-            return JarInputStream(Files.newInputStream(temp)).use { tempInput ->
-                JarLibraryReader(tempInput).read()
+            return Files.newInputStream(temp).use { tempInput ->
+                JarLibraryReader().read(tempInput)
             }
         } finally {
             Files.deleteIfExists(temp)
diff --git a/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryWriter.kt b/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryWriter.kt
index a8dbea86ef..cbf89d923b 100644
--- a/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryWriter.kt
+++ b/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryWriter.kt
@@ -3,18 +3,17 @@ 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) {
+class Pack200LibraryWriter : LibraryWriter {
+    override fun write(output: OutputStream, classPath: ClassPath, library: Library) {
         val tempJar = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
         try {
-            DeterministicJarOutputStream(Files.newOutputStream(tempJar)).use { tempOutput ->
-                JarLibraryWriter(tempOutput).write(classPath, library)
+            Files.newOutputStream(tempJar).use { tempOutput ->
+                JarLibraryWriter().write(tempOutput, classPath, library)
             }
 
             JarInputStream(Files.newInputStream(tempJar)).use { input ->
diff --git a/asm/src/main/java/dev/openrs2/asm/io/SignedJarLibraryWriter.kt b/asm/src/main/java/dev/openrs2/asm/io/SignedJarLibraryWriter.kt
index b6ed65072e..37da5d3e1a 100644
--- a/asm/src/main/java/dev/openrs2/asm/io/SignedJarLibraryWriter.kt
+++ b/asm/src/main/java/dev/openrs2/asm/io/SignedJarLibraryWriter.kt
@@ -12,21 +12,20 @@ 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) {
+    override fun write(output: OutputStream, 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)
+            Files.newOutputStream(unsignedJar).use { unsignedOutput ->
+                ManifestJarLibraryWriter(manifest).write(unsignedOutput, classPath, library)
             }
 
             val signedJar = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
             try {
                 keyStore.signJar(unsignedJar, signedJar)
-                repack(signedJar)
+                repack(signedJar, output)
             } finally {
                 Files.deleteIfExists(signedJar)
             }
@@ -35,7 +34,7 @@ class SignedJarLibraryWriter(
         }
     }
 
-    private fun repack(signedJar: Path) {
+    private fun repack(signedJar: Path, output: OutputStream) {
         JarInputStream(Files.newInputStream(signedJar)).use { input ->
             DeterministicJarOutputStream(output, input.manifest).use { output ->
                 for (entry in input.entries) {
diff --git a/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt b/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt
index 998da1e712..a23f06bc50 100644
--- a/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt
+++ b/bundler/src/main/java/dev/openrs2/bundler/Bundler.kt
@@ -3,20 +3,18 @@ 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.transform.Transformer
 import dev.openrs2.asm.io.JarLibraryReader
-import dev.openrs2.asm.io.JarLibraryWriter
+import dev.openrs2.asm.io.ManifestJarLibraryWriter
 import dev.openrs2.asm.io.Pack200LibraryReader
 import dev.openrs2.asm.io.SignedJarLibraryWriter
+import dev.openrs2.asm.transform.Transformer
 import dev.openrs2.bundler.transform.ResourceTransformer
 import dev.openrs2.conf.Config
 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
@@ -134,8 +132,8 @@ class Bundler @Inject constructor(
     private fun readJar(path: Path): Library {
         logger.info { "Reading jar $path" }
 
-        return JarInputStream(Files.newInputStream(path)).use { input ->
-            JarLibraryReader(input).read()
+        return Files.newInputStream(path).use { input ->
+            JarLibraryReader().read(input)
         }
     }
 
@@ -143,23 +141,23 @@ class Bundler @Inject constructor(
         logger.info { "Reading pack $path" }
 
         return Files.newInputStream(path).use { input ->
-            Pack200LibraryReader(input).read()
+            Pack200LibraryReader().read(input)
         }
     }
 
     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)
+        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 {
-            SignedJarLibraryWriter(it, signedManifest, keyStore).write(classPath, library)
+        Files.newOutputStream(path).use { output ->
+            SignedJarLibraryWriter(signedManifest, keyStore).write(output, classPath, library)
         }
     }
 
diff --git a/bundler/src/main/java/dev/openrs2/bundler/Resource.kt b/bundler/src/main/java/dev/openrs2/bundler/Resource.kt
index d49a3b9453..515e087b80 100644
--- a/bundler/src/main/java/dev/openrs2/bundler/Resource.kt
+++ b/bundler/src/main/java/dev/openrs2/bundler/Resource.kt
@@ -6,7 +6,6 @@ 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
@@ -71,24 +70,21 @@ class Resource(
 
         fun compressJar(source: String, destination: String, classPath: ClassPath, library: Library): Resource {
             ByteArrayOutputStream().use { output ->
-                DeterministicJarOutputStream(output).use { jarOutput ->
-                    JarLibraryWriter(jarOutput).write(classPath, library)
-                }
-
+                JarLibraryWriter().write(output, classPath, library)
                 return compress(source, destination, output.toByteArray())
             }
         }
 
         fun compressPack(source: String, destination: String, classPath: ClassPath, library: Library): Resource {
             ByteArrayOutputStream().use { output ->
-                Pack200LibraryWriter(output).write(classPath, library)
+                Pack200LibraryWriter().write(output, classPath, library)
                 return compress(source, destination, output.toByteArray())
             }
         }
 
         fun compressJs5(source: String, destination: String, classPath: ClassPath, library: Library): Resource {
             ByteArrayOutputStream().use { output ->
-                Js5LibraryWriter(output).write(classPath, library)
+                Js5LibraryWriter().write(output, 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 4af984b389..8d0e115994 100644
--- a/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
+++ b/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
@@ -8,10 +8,8 @@ import dev.openrs2.asm.io.JarLibraryWriter
 import dev.openrs2.asm.io.Pack200LibraryReader
 import dev.openrs2.asm.transform.Transformer
 import dev.openrs2.deob.remap.PrefixRemapper
-import dev.openrs2.util.io.DeterministicJarOutputStream
 import java.nio.file.Files
 import java.nio.file.Path
-import java.util.jar.JarInputStream
 import javax.inject.Inject
 import javax.inject.Singleton
 
@@ -124,8 +122,8 @@ class Deobfuscator @Inject constructor(
     private fun readJar(path: Path): Library {
         logger.info { "Reading jar $path" }
 
-        return JarInputStream(Files.newInputStream(path)).use { input ->
-            JarLibraryReader(input).read()
+        return Files.newInputStream(path).use { input ->
+            JarLibraryReader().read(input)
         }
     }
 
@@ -133,15 +131,15 @@ class Deobfuscator @Inject constructor(
         logger.info { "Reading pack $path" }
 
         return Files.newInputStream(path).use { input ->
-            Pack200LibraryReader(input).read()
+            Pack200LibraryReader().read(input)
         }
     }
 
     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)
+        Files.newOutputStream(path).use { output ->
+            JarLibraryWriter().write(output, classPath, library)
         }
     }