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

HMCLAPI/src/main/java/org/tukaani/xz/LZMA2Encoder.java

@@ -0,0 +1,50 @@
+/*
+ * LZMA2Encoder
+ *
+ * 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 org.tukaani.xz.lzma.LZMAEncoder;
+
+class LZMA2Encoder extends LZMA2Coder implements FilterEncoder {
+    private final LZMA2Options options;
+    private final byte[] props = new byte[1];
+
+    LZMA2Encoder(LZMA2Options options) {
+        if (options.getPresetDict() != null)
+            throw new IllegalArgumentException(
+                    "XZ doesn't support a preset dictionary for now");
+
+        if (options.getMode() == LZMA2Options.MODE_UNCOMPRESSED) {
+            props[0] = (byte)0;
+        } else {
+            int d = Math.max(options.getDictSize(),
+                             LZMA2Options.DICT_SIZE_MIN);
+            props[0] = (byte)(LZMAEncoder.getDistSlot(d - 1) - 23);
+        }
+
+        // Make a private copy so that the caller is free to change its copy.
+        this.options = (LZMA2Options)options.clone();
+    }
+
+    public long getFilterID() {
+        return FILTER_ID;
+    }
+
+    public byte[] getFilterProps() {
+        return props;
+    }
+
+    public boolean supportsFlushing() {
+        return true;
+    }
+
+    public FinishableOutputStream getOutputStream(FinishableOutputStream out) {
+        return options.getOutputStream(out);
+    }
+}