diff --git a/build.gradle.kts b/build.gradle.kts
index 3dd47ef..9d9996c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -286,30 +286,9 @@ val compressJar = tasks.register<ProcessJar>("compressJar") {
 	archiveVersion = "modVersion"()
 	archiveClassifier = ""
 
-	addFileProcessor("json", "mcmeta") { // remove whitespace/comments from json files
-		val json = JsonSlurper().parse(it)
-		it.outputStream().write(JsonOutput.toJson(json).toByteArray())
-	}
+	addFileProcessor(setOf("json", "mcmeta"), Compressors.json)
 
-	addFileProcessor("jar") { // store jar files with no compression
-		val tmp = it.copyTo(File.createTempFile(it.nameWithoutExtension, ".jar"), overwrite = true)
-		JarInputStream(tmp.inputStream()).use { ins ->
-			JarOutputStream(it.outputStream()).use { out ->
-				out.setLevel(Deflater.NO_COMPRESSION)
-				var entry: JarEntry? = ins.nextEntry as JarEntry?
-				while (entry != null) {
-					out.putNextEntry(JarEntry(entry.name))
-					ins.copyTo(out)
-					out.closeEntry()
-					ins.closeEntry()
-					entry = ins.nextEntry as JarEntry?
-				}
-
-				out.finish()
-				out.flush()
-			}
-		}
-	}
+	addFileProcessor(setOf("jar"), Compressors.storeJars)
 
 	addDirProcessor { dir -> // proguard
 		val temp = temporaryDir.resolve("proguard")
diff --git a/buildSrc/src/main/kotlin/Compressors.kt b/buildSrc/src/main/kotlin/Compressors.kt
new file mode 100644
index 0000000..477c08e
--- /dev/null
+++ b/buildSrc/src/main/kotlin/Compressors.kt
@@ -0,0 +1,31 @@
+import groovy.json.JsonOutput
+import groovy.json.JsonSlurper
+import java.io.File
+import java.util.jar.JarEntry
+import java.util.jar.JarInputStream
+import java.util.jar.JarOutputStream
+import java.util.zip.Deflater
+
+object Compressors {
+	val json = { input: File ->
+		input.outputStream().write(JsonOutput.toJson(JsonSlurper().parse(input)).toByteArray())
+	}
+
+	val storeJars = { input: File ->
+		val tmp = input.copyTo(File.createTempFile(input.nameWithoutExtension, ".jar"), overwrite = true)
+		JarInputStream(tmp.inputStream()).use { ins ->
+			JarOutputStream(input.outputStream()).use { out ->
+				out.setLevel(Deflater.NO_COMPRESSION)
+				while (true) {
+					out.putNextEntry(JarEntry((ins.nextEntry ?: break).name))
+					ins.copyTo(out)
+					out.closeEntry()
+					ins.closeEntry()
+				}
+
+				out.finish()
+				out.flush()
+			}
+		}
+	}
+}
diff --git a/buildSrc/src/main/kotlin/ProcessJar.kt b/buildSrc/src/main/kotlin/ProcessJar.kt
index 3b3c3ed..4411ab9 100644
--- a/buildSrc/src/main/kotlin/ProcessJar.kt
+++ b/buildSrc/src/main/kotlin/ProcessJar.kt
@@ -28,6 +28,10 @@ open class ProcessJar : Jar() {
 	}
 
 	fun addFileProcessor(vararg extensions: String, processor: FileProcessor) {
+		addFileProcessor(extensions.asIterable(), processor)
+	}
+
+	fun addFileProcessor(extensions: Iterable<String>, processor: FileProcessor) {
 		processors.add {
 			it.walkTopDown().forEach { file ->
 				if (file.extension in extensions)