Moved LZMA from utils

build.gradle.kts

@@ -108,6 +108,8 @@ dependencies {
     // https://github.com/lz4/lz4-java
     compileOnly("org.lz4:lz4-java:1.8.0")  // for xxHash, optional
 
+    compileOnly("org.tukaani:xz:1.9") // LZMA support, optional
+
     testImplementation("io.netty:netty-buffer:4.1.96.Final")
     testImplementation("com.esotericsoftware:kryo:5.5.0")
     testImplementation("org.lz4:lz4-java:1.8.0")

src/dorkbox/bytes/LZMA.kt

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2023 dorkbox, llc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package dorkbox.bytes
+
+import java.io.ByteArrayOutputStream
+import java.io.IOException
+import java.io.InputStream
+import java.io.OutputStream
+
+object LZMA {
+    // https://tukaani.org/xz/java.html
+
+    init {
+        try {
+            Class.forName("org.tukaani.xz.LZMAOutputStream")
+        }
+        catch (e: Exception) {
+            System.err.println("Please add the LZMA library to your classpath, for example: implementation(\"org.tukaani:xz:1.9\")")
+            throw e
+        }
+    }
+
+    /**
+     * Gets the version number.
+     */
+    val version = BytesInfo.version
+
+    @Throws(IOException::class)
+    fun encode(input: InputStream, output: OutputStream) {
+        org.tukaani.xz.LZMAOutputStream(output, org.tukaani.xz.LZMA2Options(3), true).use { compressionStream ->
+            input.copyTo(compressionStream)
+        }
+    }
+
+    @Throws(IOException::class)
+    fun decode(input: InputStream): ByteArrayOutputStream {
+        val byteArrayOutputStream = ByteArrayOutputStream(8192)
+        org.tukaani.xz.LZMAInputStream(input).use { compressedStream -> compressedStream.copyTo(byteArrayOutputStream) }
+        return byteArrayOutputStream
+    }
+
+    @Throws(IOException::class)
+    fun decode(input: InputStream, output: OutputStream) {
+        org.tukaani.xz.LZMAInputStream(input).use { compressedStream -> compressedStream.copyTo(output) }
+    }
+}