Fixes #34. Use canonical os.arch names for native lib folders

src/main/java/org/xerial/snappy/OSInfo.java

@@ -25,6 +25,8 @@
 package org.xerial.snappy;
 
 import java.io.IOException;
+import java.util.HashMap;
+import java.util.Locale;
 
 /**
  * Provides OS name and architecture name.
@@ -34,6 +36,48 @@ import java.io.IOException;
  */
 public class OSInfo
 {
+    private static HashMap<String, String> archMapping = new HashMap<String, String>();
+
+    public static final String X86 = "x86";
+    public static final String X86_64 = "x86_64";
+    public static final String IA64_32 = "ia64_32";
+    public static final String IA64 = "ia64";
+    public static final String PPC = "ppc";
+
+    static {
+        // x86 mappings
+        archMapping.put(X86, X86);
+        archMapping.put("i386", X86);
+        archMapping.put("i486", X86);
+        archMapping.put("i586", X86);
+        archMapping.put("i686", X86);
+        archMapping.put("pentium", X86);
+
+        // x86_64 mappings
+        archMapping.put(X86_64, X86_64);
+        archMapping.put("amd64", X86_64);
+        archMapping.put("em64t", X86_64);
+        archMapping.put("universal", X86_64); // Needed for openjdk7 in Mac
+
+        // Itenium 64-bit mappings
+        archMapping.put(IA64, IA64);
+        archMapping.put("ia64w", IA64);
+
+        // Itenium 32-bit mappings, usually an HP-UX construct
+        archMapping.put(IA64_32, IA64_32);
+        archMapping.put("ia64n", IA64_32);
+
+        // PowerPC mappings
+        archMapping.put(PPC, PPC);
+        archMapping.put("pwoer", PPC);
+        archMapping.put("powerpc", PPC);
+        archMapping.put("power_pc", PPC);
+        archMapping.put("power_rs", PPC);
+
+        // TODO: PowerPC 64bit mappings
+    }
+
+
     public static void main(String[] args) {
         if (args.length >= 1) {
             if ("--os".equals(args[0])) {
@@ -78,8 +122,10 @@ public class OSInfo
                 // ignored: fall back to "arm" arch (soft-float ABI)
             }
         } 
-        else if(getOSName().equals("Mac") && (osArch.equals("universal") || osArch.equals("amd64"))) {
+        else {
-            return "x86_64"; // Fix for openjdk7
+            String lc = osArch.toLowerCase(Locale.US);
+            if(archMapping.containsKey(lc))
+                return archMapping.get(lc);
         }
         return translateArchNameToFolderName(osArch);
     }