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base/android/javatests/src/org/chromium/base/test/TestFileUtil.java

Index: base/android/javatests/src/org/chromium/base/test/TestFileUtil.java
diff --git a/base/android/javatests/src/org/chromium/base/test/TestFileUtil.java b/base/android/javatests/src/org/chromium/base/test/TestFileUtil.java
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index 0000000000000000000000000000000000000000..66ff0853f9a73af8a55fe4f1fef2b68f4a7436a2
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.base.test;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.util.Arrays;
+
+/**
+ * Utility class for dealing with files for test.
+ */
+public class TestFileUtil {
+    /**
+     * @param fileName the file to read in.
+     * @param sizeLimit cap on the file size: will throw an exception if exceeded
+     * @return Array of chars read from the file
+     * @throws FileNotFoundException file does not exceed
+     * @throws IOException error encountered accessing the file
+     */
+    public static char[] readUtf8File(String fileName, int sizeLimit) throws
+            FileNotFoundException, IOException {
+        Reader reader = null;
+        try {
+            File f = new File(fileName);
+            if (f.length() > sizeLimit) {
+                throw new IOException("File " + fileName + " length " + f.length() +
+                        " exceeds limit " + sizeLimit);
+            }
+            char[] buffer = new char[(int) f.length()];
+            reader = new InputStreamReader(new FileInputStream(f), "UTF-8");
+            int charsRead = reader.read(buffer);
+            // Debug check that we've exhausted the input stream (will fail e.g. if the
+            // file grew after we inspected its length).
+            assert !reader.ready();
+            return charsRead < buffer.length ? Arrays.copyOfRange(buffer, 0, charsRead) : buffer;
+        } finally {
+            if (reader != null) reader.close();
+        }
+    }
+}