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/*
* 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.dex.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
/**
* File I/O utilities.
*/
public final class FileUtils {
private FileUtils() {
}
/**
* 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");
}
}
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