From 3894a5599baf217f036ddfb9f4ac2ac0b4d7a2de Mon Sep 17 00:00:00 2001
From: Satoshi Kataoka <satok@google.com>
Date: Fri, 16 Aug 2013 16:55:49 +0900
Subject: [PATCH] Consolidate hex string utils

Change-Id: Id4f4a287e3a2790b22bff7ad4a4617bf2ee82884
---
 .../com/android/inputmethod/latin/utils/StringUtils.java   | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/java/src/com/android/inputmethod/latin/utils/StringUtils.java b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
index 20cc5d815..be4184093 100644
--- a/java/src/com/android/inputmethod/latin/utils/StringUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
@@ -370,12 +370,19 @@ public final class StringUtils {
         return sb.toString();
     }
 
+    /**
+     * Convert hex string to byte array. The string length must be an even number.
+     */
     @UsedForTesting
     public static byte[] hexStringToByteArray(String hexString) {
         if (TextUtils.isEmpty(hexString)) {
             return null;
         }
         final int N = hexString.length();
+        if (N % 2 != 0) {
+            throw new NumberFormatException("Input hex string length must be an even number."
+                    + " Length = " + N);
+        }
         final byte[] bytes = new byte[N / 2];
         for (int i = 0; i < N; i += 2) {
             bytes[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4)