Some fixups and enhancements.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4294 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/StringUtil.as

@@ -4,6 +4,22 @@ import mx.utils.*;
 
 public class StringUtil
 {
+    /**
+     * Get a reasonable hash code for the specified String.
+     */
+    public static function hashCode (str :String) :int
+    {
+        var code :int = 0;
+        if (str != null) {
+            // sample at most 8 chars
+            var lastChar :int = Math.min(8, str.length);
+            for (var ii :int = 0; ii < lastChar; ii++) {
+                code = code * 31 + str.charCodeAt(ii);
+            }
+        }
+        return code;
+    }
+
     public static function isBlank (str :String) :Boolean
     {
         return (str == null) || (str.search("\\S") == -1);
@@ -15,7 +31,7 @@ public class StringUtil
     public static function endsWith (str :String, substr :String) :Boolean
     {
         var startDex :int = str.length - substr.length;
-        return (startDex >= 0) && (str.indexOf(substr, startDex) > 0);
+        return (startDex >= 0) && (str.indexOf(substr, startDex) >= 0);
     }
 
     /**