Now can download .pack.xz file for Forge library.

HMCLAPI/src/main/java/org/tukaani/xz/LZMA2Decoder.java

@@ -0,0 +1,35 @@
+/*
+ * LZMA2Decoder
+ *
+ * Author: Lasse Collin <lasse.collin@tukaani.org>
+ *
+ * This file has been put into the public domain.
+ * You can do whatever you want with this file.
+ */
+
+package org.tukaani.xz;
+
+import java.io.InputStream;
+
+class LZMA2Decoder extends LZMA2Coder implements FilterDecoder {
+    private int dictSize;
+
+    LZMA2Decoder(byte[] props) throws UnsupportedOptionsException {
+        // Up to 1.5 GiB dictionary is supported. The bigger ones
+        // are too big for int.
+        if (props.length != 1 || (props[0] & 0xFF) > 37)
+            throw new UnsupportedOptionsException(
+                    "Unsupported LZMA2 properties");
+
+        dictSize = 2 | (props[0] & 1);
+        dictSize <<= (props[0] >>> 1) + 11;
+    }
+
+    public int getMemoryUsage() {
+        return LZMA2InputStream.getMemoryUsage(dictSize);
+    }
+
+    public InputStream getInputStream(InputStream in) {
+        return new LZMA2InputStream(in, dictSize);
+    }
+}