From d4fe7fda303ff937d2e44c15dde9d90cbf59376b Mon Sep 17 00:00:00 2001
From: Yuichiro Hanada <yhanada@google.com>
Date: Tue, 21 Aug 2012 18:30:18 +0900
Subject: Use ByteBuffer when reading FusionDictionary from file.

Change-Id: Ia71561648e17f846d277c22309ac37c21c67a537
---
 .../inputmethod/latin/BinaryDictionaryGetter.java  | 27 +++++++++++++++++-----
 1 file changed, 21 insertions(+), 6 deletions(-)

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

diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionaryGetter.java b/java/src/com/android/inputmethod/latin/BinaryDictionaryGetter.java
index 4ada909de..e1cb195bc 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionaryGetter.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionaryGetter.java
@@ -25,7 +25,10 @@ import android.content.res.AssetFileDescriptor;
 import android.util.Log;
 
 import java.io.File;
-import java.io.RandomAccessFile;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Locale;
@@ -349,17 +352,21 @@ class BinaryDictionaryGetter {
         // ad-hock ## HACK ##
         if (!Locale.ENGLISH.getLanguage().equals(locale.getLanguage())) return true;
 
+        FileInputStream inStream = null;
         try {
             // Read the version of the file
-            final RandomAccessFile raf = new RandomAccessFile(f, "r");
-            final int magic = raf.readInt();
+            inStream = new FileInputStream(f);
+            final ByteBuffer buffer = inStream.getChannel().map(
+                    FileChannel.MapMode.READ_ONLY, 0, f.length());
+            final int magic = buffer.getInt();
             if (magic != BinaryDictInputOutput.VERSION_2_MAGIC_NUMBER) {
                 return false;
             }
-            final int formatVersion = raf.readInt();
-            final int headerSize = raf.readInt();
+            final int formatVersion = buffer.getInt();
+            final int headerSize = buffer.getInt();
             final HashMap<String, String> options = CollectionUtils.newHashMap();
-            BinaryDictInputOutput.populateOptionsFromFile(raf, headerSize, options);
+            BinaryDictInputOutput.populateOptions(buffer, headerSize, options);
+
             final String version = options.get(VERSION_KEY);
             if (null == version) {
                 // No version in the options : the format is unexpected
@@ -374,6 +381,14 @@ class BinaryDictionaryGetter {
             return false;
         } catch (NumberFormatException e) {
             return false;
+        } finally {
+            if (inStream != null) {
+                try {
+                    inStream.close();
+                } catch (IOException e) {
+                    // do nothing
+                }
+            }
         }
     }
 
-- 
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