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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package netscape.security.util;
import java.util.Enumeration;
import java.util.Hashtable;
import sun.io.ByteToCharConverter;
import sun.io.ByteToCharUTF8;
import sun.io.CharToByteConverter;
import sun.io.CharToByteUTF8;
/**
* Maps a ASN.1 character string type to a CharToByte and ByteToChar converter.
* The converter is used to convert a DerValue of a ASN.1 character string type
* from bytes to unicode characters and vice versa.
*
* <p>A global default ASN1CharStrConvMap is created when the class is
* initialized. The global default map is extensible.
*
* @author Lily Hsiao
* @author Slava Galperin
*
*/
public class ASN1CharStrConvMap
{
// public constructors
/**
* Constructs a ASN1CharStrConvMap.
*/
public ASN1CharStrConvMap()
{
}
/**
* Get a Character to Byte converter for the specified DER tag.
*
* @param tag A DER tag of a ASN.1 character string type,
* for example DerValue.tag_PrintableString.
*
* @return A CharToByteConverter for the DER tag.
*
* @exception InstantiationException
* if error occurs when instantiating the CharToByteConverter.
* @exception IllegalAccessException
* if error occurs when loading the CharToByteConverter class.
*/
public CharToByteConverter getCBC(byte tag)
throws IllegalAccessException, InstantiationException
{
Byte tagObj = Byte.valueOf(tag);
CharToByteConverter cbc = null;
Class<CharToByteConverter> cbcClass;
cbcClass = (Class<CharToByteConverter>)tag2CBC.get(tagObj);
if (cbcClass == null)
return null;
cbc = (CharToByteConverter)cbcClass.newInstance();
cbc.setSubstitutionMode(false);
return cbc;
}
/**
* Get a Byte to Character converter for the given DER tag.
*
* @param tag A DER tag of a ASN.1 character string type,
* for example DerValue.tag_PrintableString.
*
* @return A ByteToCharConverter for the DER tag.
*
* @exception InstantiationException
* if error occurs when instantiationg the ByteToCharConverter.
* @exception IllegalAccessException
* if error occurs when loading the ByteToCharConverter class.
*/
public ByteToCharConverter getBCC(byte tag)
throws IllegalAccessException, InstantiationException
{
Byte tagObj = Byte.valueOf(tag);
ByteToCharConverter bcc = null;
Class<ByteToCharConverter> bccClass = tag2BCC.get(tagObj);
if (bccClass == null)
return null;
bcc = (ByteToCharConverter)bccClass.newInstance();
bcc.setSubstitutionMode(false);
return bcc;
}
/**
* Add a tag-CharToByteConverter-ByteToCharConverter entry in the map.
*
* @param tag A DER tag of a ASN.1 character string type,
* ex. DerValue.tag_IA5String
* @param cbc A CharToByteConverter for the tag.
* @param bcc A ByteToCharConverter for the tag.
*/
@SuppressWarnings("unchecked")
public void addEntry(byte tag, Class<?> cbc, Class<?> bcc)
{
Class<CharToByteConverter> current_cbc;
Class<ByteToCharConverter> current_bcc;
Byte tagByte = Byte.valueOf(tag);
current_cbc = (Class<CharToByteConverter>)tag2CBC.get(tagByte);
current_bcc = (Class<ByteToCharConverter>)tag2BCC.get(tagByte);
if (current_cbc != null || current_bcc != null)
{
if (current_cbc != cbc || current_bcc != bcc)
{
throw new IllegalArgumentException(
"a DER tag to converter entry already exists.");
}
else {
return;
}
}
if (!CharToByteConverter.class.isAssignableFrom(cbc) ||
!ByteToCharConverter.class.isAssignableFrom(bcc)) {
throw new IllegalArgumentException(
"arguments not a CharToByteConverter or ByteToCharConverter");
}
tag2CBC.put(tagByte, (Class<CharToByteConverter>) cbc);
tag2BCC.put(tagByte, (Class<ByteToCharConverter>) bcc);
}
/**
* Get and enumeration of all tags in the map.
* @return An Enumeration of DER tags in the map as Bytes.
*/
public Enumeration<Byte> getTags()
{
return tag2CBC.keys();
}
// static public methods.
/**
* Get the global ASN1CharStrConvMap.
* @return The global default ASN1CharStrConvMap.
*/
static public ASN1CharStrConvMap getDefault()
{
return defaultMap;
}
/**
* Set the global default ASN1CharStrConvMap.
* @param newDefault The new default ASN1CharStrConvMap.
*/
static public void setDefault(ASN1CharStrConvMap newDefault)
{
if (newDefault == null)
throw new IllegalArgumentException(
"Cannot set a null default Der Tag Converter map");
defaultMap = newDefault;
}
// private methods and variables.
private Hashtable<Byte, Class<CharToByteConverter>> tag2CBC = new Hashtable<Byte, Class<CharToByteConverter>>();
private Hashtable<Byte, Class<ByteToCharConverter>> tag2BCC = new Hashtable<Byte, Class<ByteToCharConverter>>();
private static ASN1CharStrConvMap defaultMap;
/**
* Create the default converter map on initialization
*/
static {
defaultMap = new ASN1CharStrConvMap();
defaultMap.addEntry(DerValue.tag_PrintableString,
(Class<?>)CharToBytePrintable.class, (Class<?>)ByteToCharPrintable.class);
defaultMap.addEntry(DerValue.tag_VisibleString,
CharToBytePrintable.class, ByteToCharPrintable.class);
defaultMap.addEntry(DerValue.tag_IA5String,
CharToByteIA5String.class, ByteToCharIA5String.class);
defaultMap.addEntry(DerValue.tag_BMPString,
// Changed by bskim
//sun.io.CharToByteUnicode.class,
//netscape.security.util.ByteToCharUnicode.class);
sun.io.CharToByteUnicodeBig.class,
sun.io.ByteToCharUnicodeBig.class);
// Change end
defaultMap.addEntry(DerValue.tag_UniversalString,
CharToByteUniversalString.class,
ByteToCharUniversalString.class);
// XXX this is an oversimplified implementation of T.61 strings, it
// doesn't handle all cases
defaultMap.addEntry(DerValue.tag_T61String,
latin1CBC.class, latin1BCC.class);
// UTF8String added to ASN.1 in 1998
defaultMap.addEntry(DerValue.tag_UTF8String,
CharToByteUTF8.class,
ByteToCharUTF8.class);
defaultMap.addEntry(DerValue.tag_GeneralString,
CharToByteUTF8.class,
ByteToCharUTF8.class);
};
};
class latin1CBC extends sun.io.CharToByteISO8859_1 {
public latin1CBC() {
super();
subMode = false;
}
}
class latin1BCC extends sun.io.ByteToCharISO8859_1 {
public latin1BCC() {
super();
subMode = false;
}
}
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