From 283cf9cfc9ea8aaf437849ca469f13f029de3ed5 Mon Sep 17 00:00:00 2001
From: Satoshi Kataoka <satok@google.com>
Date: Fri, 16 Aug 2013 14:35:56 +0900
Subject: Add hex string utils

Bug: 9429906
Change-Id: I3267d1d86122ab471c3e63008c73e9f9b758fc8e
---
 .../inputmethod/latin/utils/StringUtils.java       | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'java/src/com/android/inputmethod/latin/utils/StringUtils.java')

diff --git a/java/src/com/android/inputmethod/latin/utils/StringUtils.java b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
index 0b4838cfc..20cc5d815 100644
--- a/java/src/com/android/inputmethod/latin/utils/StringUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
@@ -357,4 +357,30 @@ public final class StringUtils {
         }
         return true;
     }
+
+    @UsedForTesting
+    public static String byteArrayToHexString(byte[] bytes) {
+        if (bytes == null || bytes.length == 0) {
+            return "";
+        }
+        final StringBuilder sb = new StringBuilder();
+        for (byte b : bytes) {
+            sb.append(String.format("%02x", b & 0xff));
+        }
+        return sb.toString();
+    }
+
+    @UsedForTesting
+    public static byte[] hexStringToByteArray(String hexString) {
+        if (TextUtils.isEmpty(hexString)) {
+            return null;
+        }
+        final int N = hexString.length();
+        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)
+                    + Character.digit(hexString.charAt(i + 1), 16));
+        }
+        return bytes;
+    }
 }
-- 
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