1 files changed, 101 insertions, 0 deletions
diff --git a/dx/src/com/android/dx/util/FileUtils.java b/dx/src/com/android/dx/util/FileUtils.java
new file mode 100644
index 0000000..bcf6729
--- /dev/null
+++ b/dx/src/com/android/dx/util/FileUtils.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.dx.util;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+
+/**
+ * File I/O utilities.
+ */
+public final class FileUtils {
+    /**
+     * This class is uninstantiable.
+     */
+    private FileUtils() {
+        // This space intentionally left blank.
+    }
+
+    /**
+     * Reads the named file, translating {@link IOException} to a
+     * {@link RuntimeException} of some sort.
+     *
+     * @param fileName {@code non-null;} name of the file to read
+     * @return {@code non-null;} contents of the file
+     */
+    public static byte[] readFile(String fileName) {
+        File file = new File(fileName);
+        return readFile(file);
+    }
+
+    /**
+     * Reads the given file, translating {@link IOException} to a
+     * {@link RuntimeException} of some sort.
+     *
+     * @param file {@code non-null;} the file to read
+     * @return {@code non-null;} contents of the file
+     */
+    public static byte[] readFile(File file) {
+        if (!file.exists()) {
+            throw new RuntimeException(file + ": file not found");
+        }
+
+        if (!file.isFile()) {
+            throw new RuntimeException(file + ": not a file");
+        }
+
+        if (!file.canRead()) {
+            throw new RuntimeException(file + ": file not readable");
+        }
+
+        long longLength = file.length();
+        int length = (int) longLength;
+        if (length != longLength) {
+            throw new RuntimeException(file + ": file too long");
+        }
+
+        byte[] result = new byte[length];
+
+        try {
+            FileInputStream in = new FileInputStream(file);
+            int at = 0;
+            while (length > 0) {
+                int amt = in.read(result, at, length);
+                if (amt == -1) {
+                    throw new RuntimeException(file + ": unexpected EOF");
+                }
+                at += amt;
+                length -= amt;
+            }
+            in.close();
+        } catch (IOException ex) {
+            throw new RuntimeException(file + ": trouble reading", ex);
+        }
+
+        return result;
+    }
+
+    /**
+     * Returns true if {@code fileName} names a .zip, .jar, or .apk.
+     */
+    public static boolean hasArchiveSuffix(String fileName) {
+        return fileName.endsWith(".zip")
+                || fileName.endsWith(".jar")
+                || fileName.endsWith(".apk");
+    }
+}