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Java Native Access Platform
/*
* Copyright (c) 2018 Václav Haisman, All Rights Reserved
*
* The contents of this file is dual-licensed under 2
* alternative Open Source/Free licenses: LGPL 2.1 or later and
* Apache License 2.0.
*
* You can freely decide which license you want to apply to
* the project.
*
* You may obtain a copy of the LGPL License at:
*
* http://www.gnu.org/licenses/licenses.html
*
* A copy is also included in the downloadable source code package
* containing JNA, in file "LGPL2.1".
*
* You may obtain a copy of the Apache License at:
*
* http://www.apache.org/licenses/
*
* A copy is also included in the downloadable source code package
* containing JNA, in file "AL2.0".
*/
package com.sun.jna.platform.linux;
import com.sun.jna.Memory;
import com.sun.jna.Native;
import com.sun.jna.platform.linux.XAttr.size_t;
import com.sun.jna.platform.linux.XAttr.ssize_t;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* Utility functions class for handling file extended attributes on Linux.
*/
public abstract class XAttrUtil {
private XAttrUtil() {
}
/**
* Set or replace value of extended attribute.
*
* @param path file path
* @param name extended attribute name
* @param value value to set
* @throws IOException on any error
*/
public static void setXAttr(String path, String name, String value) throws IOException {
setXAttr(path, name, value, Native.getDefaultStringEncoding());
}
/**
* Set or replace value of extended attribute.
*
* @param path file path
* @param name extended attribute name
* @param value value to set
* @param encoding character encoding to be used for stored value
* @throws IOException on any error
*/
public static void setXAttr(String path, String name, String value, String encoding)
throws IOException {
setXAttr(path, name, value.getBytes(encoding));
}
/**
* Set or replace value of extended attribute.
*
* @param path file path
* @param name extended attribute name
* @param value value to set
* @throws IOException on any error
*/
public static void setXAttr(String path, String name, byte[] value) throws IOException {
int retval = XAttr.INSTANCE.setxattr(path, name, value, new size_t(value.length), 0);
if (retval != 0) {
final int eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
}
/**
* Set or replace value of extended attribute but in case of symbolic link set the extended
* attribute on the link itself instead linked file.
*
* @param path file path
* @param name extended attribute name
* @param value value to set
* @throws IOException on any error
*/
public static void lSetXAttr(String path, String name, String value) throws IOException {
lSetXAttr(path, name, value, Native.getDefaultStringEncoding());
}
/**
* Set or replace value of extended attribute but in case of symbolic link set the extended
* attribute on the link itself instead linked file.
*
* @param path file path
* @param name extended attribute name
* @param value value to set
* @param encoding character encoding to be used for stored value
* @throws IOException on any error
*/
public static void lSetXAttr(String path, String name, String value, String encoding)
throws IOException {
lSetXAttr(path, name, value.getBytes(encoding));
}
/**
* Set or replace value of extended attribute but in case of symbolic link set the extended
* attribute on the link itself instead linked file.
*
* @param path file path
* @param name extended attribute name
* @param value value to set
* @throws IOException on any error
*/
public static void lSetXAttr(String path, String name, byte[] value) throws IOException {
final int retval = XAttr.INSTANCE.lsetxattr(path, name, value, new size_t(value.length), 0);
if (retval != 0) {
final int eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
}
/**
* Set or replace value of extended attribute.
*
* @param fd file handle
* @param name extended attribute name
* @param value value to set
* @throws IOException on any error
*/
public static void fSetXAttr(int fd, String name, String value) throws IOException {
fSetXAttr(fd, name, value, Native.getDefaultStringEncoding());
}
/**
* Set or replace value of extended attribute.
*
* @param fd file handle
* @param name extended attribute name
* @param value value to set
* @param encoding character encoding to be used for stored value
* @throws IOException on any error
*/
public static void fSetXAttr(int fd, String name, String value, String encoding)
throws IOException {
fSetXAttr(fd, name, value.getBytes(encoding));
}
/**
* Set or replace value of extended attribute.
*
* @param fd file handle
* @param name extended attribute name
* @param value value to set
* @throws IOException on any error
*/
public static void fSetXAttr(int fd, String name, byte[] value) throws IOException {
final int retval = XAttr.INSTANCE.fsetxattr(fd, name, value, new size_t(value.length), 0);
if (retval != 0) {
final int eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
}
/**
* Get extended attribute value.
*
* @param path file path
* @param name extended attribute name
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static String getXAttr(String path, String name) throws IOException {
return getXAttr(path, name, Native.getDefaultStringEncoding());
}
/**
* Get extended attribute value.
*
* @param path file path
* @param name extended attribute name
* @param encoding character encoding to be used to decode stored extended attribute value
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static String getXAttr(String path, String name, String encoding) throws IOException {
byte[] valueMem = getXAttrBytes(path, name);
return new String(valueMem, Charset.forName(encoding));
}
/**
* Get extended attribute value.
*
* @param path file path
* @param name extended attribute name
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static byte[] getXAttrBytes(String path, String name) throws IOException {
ssize_t retval;
byte[] valueMem;
int eno = 0;
do {
retval = XAttr.INSTANCE.getxattr(path, name, (byte[]) null, size_t.ZERO);
if (retval.longValue() < 0) {
eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
valueMem = new byte[retval.intValue()];
retval = XAttr.INSTANCE.getxattr(path, name, valueMem, new size_t(valueMem.length));
if (retval.longValue() < 0) {
eno = Native.getLastError();
if (eno != XAttr.ERANGE) {
throw new IOException("errno: " + eno);
}
}
} while (retval.longValue() < 0 && eno == XAttr.ERANGE);
return valueMem;
}
/**
* Get extended attribute value.
*
* @param path file path
* @param name extended attribute name
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static Memory getXAttrAsMemory(String path, String name) throws IOException {
ssize_t retval;
Memory valueMem;
int eno = 0;
do {
retval = XAttr.INSTANCE.getxattr(path, name, (Memory) null, size_t.ZERO);
if (retval.longValue() < 0) {
eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
if (retval.longValue() == 0) {
return null;
}
valueMem = new Memory(retval.longValue());
retval = XAttr.INSTANCE.getxattr(path, name, valueMem, new size_t(valueMem.size()));
if (retval.longValue() < 0) {
eno = Native.getLastError();
if (eno != XAttr.ERANGE) {
throw new IOException("errno: " + eno);
}
}
} while (retval.longValue() < 0 && eno == XAttr.ERANGE);
return valueMem;
}
/**
* Get extended attribute value but in case of symbolic link get the value from the link
* itself instead of linked file.
*
* @param path file path
* @param name extended attribute name
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static String lGetXAttr(String path, String name) throws IOException {
return lGetXAttr(path, name, Native.getDefaultStringEncoding());
}
/**
* Get extended attribute value but in case of symbolic link get the value from the link
* itself instead of linked file.
*
* @param path file path
* @param name extended attribute name
* @param encoding character encoding to be used to decode stored extended attribute value
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static String lGetXAttr(String path, String name, String encoding) throws IOException {
byte[] valueMem = lGetXAttrBytes(path, name);
return new String(valueMem, Charset.forName(encoding));
}
/**
* Get extended attribute value but in case of symbolic link get the value from the link
* itself instead of linked file.
*
* @param path file path
* @param name extended attribute name
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static byte[] lGetXAttrBytes(String path, String name) throws IOException {
ssize_t retval;
byte[] valueMem;
int eno = 0;
do {
retval = XAttr.INSTANCE.lgetxattr(path, name, (byte[]) null, size_t.ZERO);
if (retval.longValue() < 0) {
eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
valueMem = new byte[retval.intValue()];
retval = XAttr.INSTANCE.lgetxattr(path, name, valueMem, new size_t(valueMem.length));
if (retval.longValue() < 0) {
eno = Native.getLastError();
if (eno != XAttr.ERANGE) {
throw new IOException("errno: " + eno);
}
}
} while (retval.longValue() < 0 && eno == XAttr.ERANGE);
return valueMem;
}
/**
* Get extended attribute value but in case of symbolic link get the value from the link
* itself instead of linked file.
*
* @param path file path
* @param name extended attribute name
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static Memory lGetXAttrAsMemory(String path, String name) throws IOException {
ssize_t retval;
Memory valueMem;
int eno = 0;
do {
retval = XAttr.INSTANCE.lgetxattr(path, name, (Memory) null, size_t.ZERO);
if (retval.longValue() < 0) {
eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
if (retval.longValue() == 0) {
return null;
}
valueMem = new Memory(retval.longValue());
retval = XAttr.INSTANCE.lgetxattr(path, name, valueMem, new size_t(valueMem.size()));
if (retval.longValue() < 0) {
eno = Native.getLastError();
if (eno != XAttr.ERANGE) {
throw new IOException("errno: " + eno);
}
}
} while (retval.longValue() < 0 && eno == XAttr.ERANGE);
return valueMem;
}
/**
* Get extended attribute value.
*
* @param fd file handle
* @param name extended attribute name
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static String fGetXAttr(int fd, String name) throws IOException {
return fGetXAttr(fd, name, Native.getDefaultStringEncoding());
}
/**
* Get extended attribute value.
*
* @param fd file handle
* @param name extended attribute name
* @param encoding character encoding to be used to decode stored extended attribute value
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static String fGetXAttr(int fd, String name, String encoding) throws IOException {
byte[] valueMem = fGetXAttrBytes(fd, name);
return new String(valueMem, Charset.forName(encoding));
}
/**
* Get extended attribute value.
*
* @param fd file handle
* @param name extended attribute name
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static byte[] fGetXAttrBytes(int fd, String name) throws IOException {
ssize_t retval;
byte[] valueMem;
int eno = 0;
do {
retval = XAttr.INSTANCE.fgetxattr(fd, name, (byte[]) null, size_t.ZERO);
if (retval.longValue() < 0) {
eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
valueMem = new byte[retval.intValue()];
retval = XAttr.INSTANCE.fgetxattr(fd, name, valueMem, new size_t(valueMem.length));
if (retval.longValue() < 0) {
eno = Native.getLastError();
if (eno != XAttr.ERANGE) {
throw new IOException("errno: " + eno);
}
}
} while (retval.longValue() < 0 && eno == XAttr.ERANGE);
return valueMem;
}
/**
* Get extended attribute value.
*
* @param fd file handle
* @param name extended attribute name
* @return extended attribute value
* @throws IOException on any error except ERANGE which handled internally
*/
public static Memory fGetXAttrAsMemory(int fd, String name) throws IOException {
ssize_t retval;
Memory valueMem;
int eno = 0;
do {
retval = XAttr.INSTANCE.fgetxattr(fd, name, (Memory) null, size_t.ZERO);
if (retval.longValue() < 0) {
eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
if (retval.longValue() == 0) {
return null;
}
valueMem = new Memory(retval.longValue());
retval = XAttr.INSTANCE.fgetxattr(fd, name, valueMem, new size_t(valueMem.size()));
if (retval.longValue() < 0) {
eno = Native.getLastError();
if (eno != XAttr.ERANGE) {
throw new IOException("errno: " + eno);
}
}
} while (retval.longValue() < 0 && eno == XAttr.ERANGE);
return valueMem;
}
/**
* List extended attributes on file.
*
* @param path file path
* @return collection of extended attributes' names
* @throws IOException on any error except ERANGE which handled internally
*/
public static Collection listXAttr(String path) throws IOException {
return listXAttr(path, Native.getDefaultStringEncoding());
}
/**
* List extended attributes on file.
*
* @param path file path
* @param encoding character encoding use to decode extended attributes' names
* @return collection of extended attributes' names
* @throws IOException on any error except ERANGE which handled internally
*/
public static Collection listXAttr(String path, String encoding) throws IOException {
ssize_t retval;
byte[] listMem;
int eno = 0;
do {
retval = XAttr.INSTANCE.listxattr(path, (byte[]) null, size_t.ZERO);
if (retval.longValue() < 0) {
eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
listMem = new byte[retval.intValue()];
retval = XAttr.INSTANCE.listxattr(path, listMem, new size_t(listMem.length));
if (retval.longValue() < 0) {
eno = Native.getLastError();
if (eno != XAttr.ERANGE) {
throw new IOException("errno: " + eno);
}
}
} while (retval.longValue() < 0 && eno == XAttr.ERANGE);
return splitBufferToStrings(listMem, encoding);
}
/**
* List extended attributes on file but in case of symbolic link get extended attributes of
* the link itself instead of linked file.
*
* @param path file path
* @return collection of extended attributes' names
* @throws IOException on any error except ERANGE which handled internally
*/
public static Collection lListXAttr(String path) throws IOException {
return lListXAttr(path, Native.getDefaultStringEncoding());
}
/**
* List extended attributes on file but in case of symbolic link get extended attributes of
* the link itself instead of linked file.
*
* @param path file path
* @param encoding character encoding use to decode extended attributes' names
* @return collection of extended attributes' names
* @throws IOException on any error except ERANGE which handled internally
*/
public static Collection lListXAttr(String path, String encoding) throws IOException {
ssize_t retval;
byte[] listMem;
int eno = 0;
do {
retval = XAttr.INSTANCE.llistxattr(path, (byte[]) null, size_t.ZERO);
if (retval.longValue() < 0) {
eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
listMem = new byte[retval.intValue()];
retval = XAttr.INSTANCE.llistxattr(path, listMem, new size_t(listMem.length));
if (retval.longValue() < 0) {
eno = Native.getLastError();
if (eno != XAttr.ERANGE) {
throw new IOException("errno: " + eno);
}
}
} while (retval.longValue() < 0 && eno == XAttr.ERANGE);
return splitBufferToStrings(listMem, encoding);
}
/**
* List extended attributes on file.
*
* @param fd file handle
* @return collection of extended attributes' names
* @throws IOException on any error except ERANGE which handled internally
*/
public static Collection fListXAttr(int fd) throws IOException {
return fListXAttr(fd, Native.getDefaultStringEncoding());
}
/**
* List extended attributes on file.
*
* @param fd file handle
* @param encoding character encoding use to decode extended attributes' names
* @return collection of extended attributes' names
* @throws IOException on any error except ERANGE which handled internally
*/
public static Collection fListXAttr(int fd, String encoding) throws IOException {
ssize_t retval;
byte[] listMem;
int eno = 0;
do {
retval = XAttr.INSTANCE.flistxattr(fd, (byte[]) null, size_t.ZERO);
if (retval.longValue() < 0) {
eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
listMem = new byte[retval.intValue()];
retval = XAttr.INSTANCE.flistxattr(fd, listMem, new size_t(listMem.length));
if (retval.longValue() < 0) {
eno = Native.getLastError();
if (eno != XAttr.ERANGE) {
throw new IOException("errno: " + eno);
}
}
} while (retval.longValue() < 0 && eno == XAttr.ERANGE);
return splitBufferToStrings(listMem, encoding);
}
/**
* Remove extended attribute from file.
*
* @param path file path
* @param name extended attribute name
* @throws IOException on any error
*/
public static void removeXAttr(String path, String name) throws IOException {
final int retval = XAttr.INSTANCE.removexattr(path, name);
if (retval != 0) {
final int eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
}
/**
* Remove extended attribute from file but in case of symbolic link remove extended attribute
* from the link itself instead of linked file.
*
* @param path file path
* @param name extended attribute name
* @throws IOException on any error
*/
public static void lRemoveXAttr(String path, String name) throws IOException {
final int retval = XAttr.INSTANCE.lremovexattr(path, name);
if (retval != 0) {
final int eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
}
/**
* Remove extended attribute from file.
*
* @param fd file handle
* @param name extended attribute name
* @throws IOException on any error
*/
public static void fRemoveXAttr(int fd, String name) throws IOException {
final int retval = XAttr.INSTANCE.fremovexattr(fd, name);
if (retval != 0) {
final int eno = Native.getLastError();
throw new IOException("errno: " + eno);
}
}
private static Collection splitBufferToStrings(byte[] valueMem, String encoding)
throws IOException {
final Charset charset = Charset.forName(encoding);
final Set attributesList = new LinkedHashSet(1);
int offset = 0;
for(int i = 0; i < valueMem.length; i++) {
// each entry is terminated by a single \0 byte
if(valueMem[i] == 0) {
// Convert bytes of the name to String.
final String name = new String(valueMem, offset, i - offset, charset);
attributesList.add(name);
offset = i + 1;
}
}
return attributesList;
}
}
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