/* Copyright (c) 2014 Reinhard Pointner, All Rights Reserved
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package com.sun.jna.platform.mac;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import com.sun.jna.Memory;
public class XAttrUtil {
public static List<String> listXAttr(String path) {
// get required buffer size
long bufferLength = XAttr.INSTANCE.listxattr(path, null, 0, 0);
if (bufferLength < 0)
return null;
if (bufferLength == 0)
return new ArrayList<String>(0);
Memory valueBuffer = new Memory(bufferLength);
long valueLength = XAttr.INSTANCE.listxattr(path, valueBuffer, bufferLength, 0);
if (valueLength < 0)
return null;
return decodeStringSequence(valueBuffer.getByteBuffer(0, valueLength));
}
public static String getXAttr(String path, String name) {
// get required buffer size
long bufferLength = XAttr.INSTANCE.getxattr(path, name, null, 0, 0, 0);
if (bufferLength < 0)
return null;
Memory valueBuffer = new Memory(bufferLength);
long valueLength = XAttr.INSTANCE.getxattr(path, name, valueBuffer, bufferLength, 0, 0);
if (valueLength < 0)
return null;
return decodeString(valueBuffer.getByteBuffer(0, valueLength - 1));
}
public static int setXAttr(String path, String name, String value) {
Memory valueBuffer = encodeString(value);
return XAttr.INSTANCE.setxattr(path, name, valueBuffer, valueBuffer.size(), 0, 0);
}
public static int removeXAttr(String path, String name) {
return XAttr.INSTANCE.removexattr(path, name, 0);
}
protected static Memory encodeString(String s) {
// create NULL-terminated UTF-8 String
byte[] bb = s.getBytes(Charset.forName("UTF-8"));
Memory valueBuffer = new Memory(bb.length + 1);
valueBuffer.write(0, bb, 0, bb.length);
valueBuffer.setByte(valueBuffer.size() - 1, (byte) 0);
return valueBuffer;
}
protected static String decodeString(ByteBuffer bb) {
return Charset.forName("UTF-8").decode(bb).toString();
}
protected static List<String> decodeStringSequence(ByteBuffer bb) {
List<String> names = new ArrayList<String>();
bb.mark(); // first key starts from here
while (bb.hasRemaining()) {
if (bb.get() == 0) {
ByteBuffer nameBuffer = (ByteBuffer) bb.duplicate().limit(bb.position() - 1).reset();
if (nameBuffer.hasRemaining()) {
names.add(decodeString(nameBuffer));
}
bb.mark(); // next key starts from here
}
}
return names;
}
}