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Library providing APIs to talk to Android devices
/*
* Copyright (C) 2014 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.ddmlib;
import com.android.annotations.NonNull;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
public class ByteBufferUtil {
@NonNull
public static ByteBuffer mapFile(@NonNull File f, long offset, @NonNull ByteOrder byteOrder) throws IOException {
FileInputStream dataFile = new FileInputStream(f);
try {
FileChannel fc = dataFile.getChannel();
MappedByteBuffer buffer = fc.map(FileChannel.MapMode.READ_ONLY, offset, f.length() - offset);
buffer.order(byteOrder);
return buffer;
} finally {
dataFile.close(); // this *also* closes the associated channel, fc
}
}
@NonNull
public static String getString(@NonNull ByteBuffer buf, int len) {
char[] data = new char[len];
for (int i = 0; i < len; i++)
data[i] = buf.getChar();
return new String(data);
}
public static void putString(@NonNull ByteBuffer buf, @NonNull String str) {
int len = str.length();
for (int i = 0; i < len; i++)
buf.putChar(str.charAt(i));
}
}