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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you 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 .
*/
package com.sun.star.lib.loader;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
/**
* This class provides functionality for reading string values from the
* Windows Registry. It requires the native library unowinreg.dll.
*/
final class WinRegKey {
private final String m_rootKeyName;
private final String m_subKeyName;
// native methods to access the windows registry
private static native boolean winreg_RegOpenClassesRoot( long[] hkresult );
private static native boolean winreg_RegOpenCurrentConfig(
long[] hkresult );
private static native boolean winreg_RegOpenCurrentUser( long[] hkresult );
private static native boolean winreg_RegOpenLocalMachine( long[] hkresult );
private static native boolean winreg_RegOpenUsers( long[] hkresult );
private static native boolean winreg_RegOpenKeyEx( long parent, String name,
long[] hkresult );
private static native boolean winreg_RegCloseKey( long hkey );
private static native boolean winreg_RegQueryValueEx(
long hkey, String value, long[] type,
byte[] data, long[] size );
private static native boolean winreg_RegQueryInfoKey(
long hkey, long[] subkeys, long[] maxSubkeyLen,
long[] values, long[] maxValueNameLen,
long[] maxValueLen, long[] secDescriptor );
// load the native library unowinreg.dll
static {
try {
ClassLoader cl = WinRegKey.class.getClassLoader();
InputStream is = cl.getResourceAsStream( "win/unowinreg.dll" );
if ( is != null ) {
// generate a temporary name for lib file and write to temp
// location
BufferedInputStream istream = new BufferedInputStream( is );
File libfile = File.createTempFile( "unowinreg", ".dll" );
libfile.deleteOnExit(); // ensure deletion
BufferedOutputStream ostream = new BufferedOutputStream(
new FileOutputStream( libfile ) );
int bsize = 2048; int n = 0;
byte[] buffer = new byte[bsize];
while ( ( n = istream.read( buffer, 0, bsize ) ) != -1 ) {
ostream.write( buffer, 0, n );
}
istream.close();
ostream.close();
// load library
System.load( libfile.getPath() );
} else {
// If the library cannot be found as a class loader resource,
// try the global System.loadLibrary(). The JVM will look for
// it in the java.library.path.
System.loadLibrary( "unowinreg" );
}
} catch ( java.lang.Exception e ) {
System.err.println( "com.sun.star.lib.loader.WinRegKey: " +
"loading of native library failed!" + e );
}
}
/**
* Constructs a <code>WinRegKey</code>.
*/
public WinRegKey( String rootKeyName, String subKeyName ) {
m_rootKeyName = rootKeyName;
m_subKeyName = subKeyName;
}
/**
* Reads a string value for the specified value name.
*/
public String getStringValue( String valueName ) throws WinRegKeyException {
byte[] data = getValue( valueName );
// remove terminating null character
return new String( data, 0, data.length - 1 );
}
/**
* Reads a value for the specified value name.
*/
private byte[] getValue( String valueName ) throws WinRegKeyException {
byte[] result = null;
long[] hkey = {0};
// open the specified registry key
boolean bRet = false;
long[] hroot = {0};
if ( m_rootKeyName.equals( "HKEY_CLASSES_ROOT" ) ) {
bRet = winreg_RegOpenClassesRoot( hroot );
} else if ( m_rootKeyName.equals( "HKEY_CURRENT_CONFIG" ) ) {
bRet = winreg_RegOpenCurrentConfig( hroot );
} else if ( m_rootKeyName.equals( "HKEY_CURRENT_USER" ) ) {
bRet = winreg_RegOpenCurrentUser( hroot );
} else if ( m_rootKeyName.equals( "HKEY_LOCAL_MACHINE" ) ) {
bRet = winreg_RegOpenLocalMachine( hroot );
} else if ( m_rootKeyName.equals( "HKEY_USERS" ) ) {
bRet = winreg_RegOpenUsers( hroot );
} else {
throw new WinRegKeyException( "unknown root registry key!");
}
if ( !bRet ) {
throw new WinRegKeyException( "opening root registry key " +
"failed!" );
}
if ( !winreg_RegOpenKeyEx( hroot[0], m_subKeyName, hkey ) ) {
if ( !winreg_RegCloseKey( hroot[0] ) ) {
throw new WinRegKeyException( "opening registry key and " +
"releasing root registry key handle failed!" );
}
throw new WinRegKeyException( "opening registry key failed!" );
}
// get the size of the longest data component among the key's values
long[] subkeys = {0};
long[] maxSubkeyLen = {0};
long[] values = {0};
long[] maxValueNameLen = {0};
long[] maxValueLen = {0};
long[] secDescriptor = {0};
if ( !winreg_RegQueryInfoKey( hkey[0], subkeys, maxSubkeyLen,
values, maxValueNameLen, maxValueLen, secDescriptor ) ) {
if ( !winreg_RegCloseKey( hkey[0] ) ||
!winreg_RegCloseKey( hroot[0] ) ) {
throw new WinRegKeyException( "retrieving information about " +
"the registry key and releasing registry key handles " +
"failed!" );
}
throw new WinRegKeyException( "retrieving information about " +
"the registry key failed!" );
}
// get the data for the specified value name
byte[] buffer = new byte[ (int) maxValueLen[0] ];
long[] size = new long[1];
size[0] = buffer.length;
long[] type = new long[1];
type[0] = 0;
if ( !winreg_RegQueryValueEx( hkey[0], valueName, type, buffer,
size ) ) {
if ( !winreg_RegCloseKey( hkey[0] ) ||
!winreg_RegCloseKey( hroot[0] ) ) {
throw new WinRegKeyException( "retrieving data for the " +
"specified value name and releasing registry key handles " +
"failed!" );
}
throw new WinRegKeyException( "retrieving data for the " +
"specified value name failed!" );
}
// release registry key handles
if ( !winreg_RegCloseKey( hkey[0] ) ||
!winreg_RegCloseKey( hroot[0] ) ) {
throw new WinRegKeyException( "releasing registry key handles " +
"failed!" );
}
result = new byte[ (int) size[0] ];
System.arraycopy( buffer, 0, result, 0, (int)size[0] );
return result;
}
}
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