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

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

@@ -0,0 +1,33 @@
+/*
+ * RawCoder
+ *
+ * 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;
+
+class RawCoder {
+    static void validate(FilterCoder[] filters)
+            throws UnsupportedOptionsException {
+        for (int i = 0; i < filters.length - 1; ++i)
+            if (!filters[i].nonLastOK())
+                throw new UnsupportedOptionsException(
+                        "Unsupported XZ filter chain");
+
+        if (!filters[filters.length - 1].lastOK())
+            throw new UnsupportedOptionsException(
+                    "Unsupported XZ filter chain");
+
+        int changesSizeCount = 0;
+        for (int i = 0; i < filters.length; ++i)
+            if (filters[i].changesSize())
+                ++changesSizeCount;
+
+        if (changesSizeCount > 3)
+            throw new UnsupportedOptionsException(
+                    "Unsupported XZ filter chain");
+    }
+}