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ZipUtil.java
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ZipUtil.java
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/*
* Copyright (c) 2009-2012 Panxiaobo
*
* 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.googlecode.d2j.reader.zip;
import com.googlecode.d2j.util.zip.AccessBufByteArrayOutputStream;
import com.googlecode.d2j.util.zip.ZipEntry;
import com.googlecode.d2j.util.zip.ZipFile;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
/**
* @author bob
*
*/
public class ZipUtil {
public static byte[] toByteArray(InputStream is) throws IOException {
AccessBufByteArrayOutputStream out = new AccessBufByteArrayOutputStream();
byte[] buff = new byte[1024];
for (int c = is.read(buff); c > 0; c = is.read(buff)) {
out.write(buff, 0, c);
}
return out.getBuf();
}
/**
* read the dex file from file, if the file is a zip file, it will return the content of classes.dex in the zip
* file.
*
* @param file
* @return
* @throws IOException
*/
public static byte[] readDex(File file) throws IOException {
return readDex(file.toPath());
}
public static byte[] readDex(Path file) throws IOException {
return readDex(Files.readAllBytes(file));
}
public static byte[] readDex(InputStream in) throws IOException {
return readDex(toByteArray(in));
}
/**
* read the dex file from byte array, if the byte array is a zip stream, it will return the content of classes.dex
* in the zip stream.
*
* @param data
* @return the content of classes.dex
* @throws IOException
*/
public static byte[] readDex(byte[] data) throws IOException {
if (data.length < 3) {
throw new IOException("File too small to be a dex/zip");
}
if ("dex".equals(new String(data, 0, 3, StandardCharsets.ISO_8859_1))) {// dex
return data;
} else if ("PK".equals(new String(data, 0, 2, StandardCharsets.ISO_8859_1))) {// ZIP
try (ZipFile zipFile = new ZipFile(data)) {
ZipEntry classes = zipFile.findFirstEntry("classes.dex");
if (classes != null) {
return toByteArray(zipFile.getInputStream(classes));
} else {
throw new IOException("Can not find classes.dex in zip file");
}
}
}
throw new IOException("the src file not a .dex or zip file");
}
}