// --- 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.x509;

import java.io.IOException;

import netscape.security.util.ASN1CharStrConvMap;
import netscape.security.util.DerValue;
import sun.io.CharToByteConverter;

/**
 * A AVAValueConverter that converts a IA5String attribute to a DerValue and
 * vice versa. An example an attribute that is a IA5String string is "E".
 * 
 * @see AVAValueConverter
 * 
 * @author Lily Hsiao, Slava Galperin at Netscape Communications, Inc.
 */

public class IA5StringConverter implements AVAValueConverter {
    // public constructors

    /*
     * Contructs a IA5String Converter.
     */
    public IA5StringConverter() {
    }

    /*
     * Converts a string with ASN.1 IA5String characters to a DerValue.
     * 
     * @param valueString a string with IA5String characters.
     * 
     * @return a DerValue.
     * 
     * @exception IOException if a IA5String CharToByteConverter is not
     * available for the conversion.
     */
    public DerValue getValue(String valueString) throws IOException {
        return getValue(valueString, null);
    }

    public DerValue getValue(String valueString, byte[] encodingOrder)
            throws IOException {
        ASN1CharStrConvMap map;
        CharToByteConverter cbc;
        byte[] bbuf = new byte[valueString.length()];
        map = ASN1CharStrConvMap.getDefault();
        try {
            cbc = map.getCBC(DerValue.tag_IA5String);
            if (cbc == null)
                throw new IOException("No CharToByteConverter for IA5String");
            cbc.convert(valueString.toCharArray(), 0, valueString.length(),
                    bbuf, 0, bbuf.length);
        } catch (java.io.CharConversionException e) {
            throw new IllegalArgumentException(
                    "Invalid IA5String AVA Value string");
        } catch (InstantiationException e) {
            throw new IOException("Cannot instantiate CharToByteConverter");
        } catch (IllegalAccessException e) {
            throw new IOException("Illegal access loading CharToByteConverter");
        }
        return new DerValue(DerValue.tag_IA5String, bbuf);
    }

    /*
     * Converts a BER encoded value of IA5String to a DER encoded value. Checks
     * if the BER encoded value is a IA5String. NOTE only DER encoding is
     * currently supported on for the BER encoded value.
     * 
     * @param berStream a byte array of the BER encoded value.
     * 
     * @return a DerValue.
     * 
     * @exception IOException if the BER value cannot be converted to a
     * IA5String DER value.
     */
    public DerValue getValue(byte[] berStream) throws IOException {
        DerValue value = new DerValue(berStream);
        if (value.tag == DerValue.tag_IA5String)
            return value;
        if (value.tag == DerValue.tag_PrintableString)
            return value;
        throw new IOException("Invalid IA5String AVA Value.");
    }

    /*
     * Converts a DerValue of IA5String to a java string with IA5String
     * characters.
     * 
     * @param avaValue a DerValue.
     * 
     * @return a string with IA5String characters.
     * 
     * @exception IOException if the DerValue is not a IA5String i.e. The
     * DerValue cannot be converted to a string with IA5String characters.
     */
    public String getAsString(DerValue avaValue) throws IOException {
        if (avaValue.tag == DerValue.tag_IA5String)
            return avaValue.getIA5String();
        if (avaValue.tag == DerValue.tag_PrintableString)
            return avaValue.getPrintableString();
        throw new IOException("Invalid IA5String AVA Value.");
    }

}