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/*
 * This file is part of the SCUBA smart card framework.
 *
 * 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * Copyright (C) 2009 - 2015  The SCUBA team.
 *
 * $Id: ASN1Util.java 246 2015-04-09 08:13:52Z martijno $
 */

package net.sf.scuba.tlv;

import java.text.ParseException;
import java.text.SimpleDateFormat;

import net.sf.scuba.util.Hex;

class ASN1Util implements ASN1Constants {

	private static final SimpleDateFormat SDF = new SimpleDateFormat("yyMMddhhmmss'Z'");	
	
	/*
	 * Primitive, the value consists of 0 or more Simple-TLV objects, or
	 * just (application-dependent) bytes. If tag is not known (or
	 * universal) we assume the value is just bytes.
	 */
	static Object interpretPrimitiveValue(int tag, byte[] valueBytes) {
		if (TLVUtil.getTagClass(tag) == UNIVERSAL_CLASS)
			switch (tag) {
			case INTEGER_TYPE_TAG:
			case BIT_STRING_TYPE_TAG:
			case OCTET_STRING_TYPE_TAG:
			case NULL_TYPE_TAG:
			case OBJECT_IDENTIFIER_TYPE_TAG:
				return valueBytes;
			case UTF8_STRING_TYPE_TAG:
			case PRINTABLE_STRING_TYPE_TAG:
			case T61_STRING_TYPE_TAG:
			case IA5_STRING_TYPE_TAG:
			case VISIBLE_STRING_TYPE_TAG:
			case GENERAL_STRING_TYPE_TAG:
			case UNIVERSAL_STRING_TYPE_TAG:
			case BMP_STRING_TYPE_TAG:
				return new String(valueBytes);
			case UTC_TIME_TYPE_TAG:
				try { return SDF.parse(new String(valueBytes)); } catch (ParseException pe) { }
			}
		return valueBytes;
	}
	
	static String tagToString(int tag) {
		if (TLVUtil.getTagClass(tag) == UNIVERSAL_CLASS) {
			if (TLVUtil.isPrimitive(tag)) {
				switch (tag & 0x1F) {
				case BOOLEAN_TYPE_TAG:
					return "BOOLEAN";
				case INTEGER_TYPE_TAG:
					return "INTEGER";
				case BIT_STRING_TYPE_TAG:
					return "BIT_STRING";
				case OCTET_STRING_TYPE_TAG:
					return "OCTET_STRING";
				case NULL_TYPE_TAG:
					return "NULL";
				case OBJECT_IDENTIFIER_TYPE_TAG:
					return "OBJECT_IDENTIFIER";
				case REAL_TYPE_TAG:
					return "REAL";
				case UTF8_STRING_TYPE_TAG:
					return "UTF_STRING";
				case PRINTABLE_STRING_TYPE_TAG:
					return "PRINTABLE_STRING";
				case T61_STRING_TYPE_TAG:
					return "T61_STRING";
				case IA5_STRING_TYPE_TAG:
					return "IA5_STRING";
				case VISIBLE_STRING_TYPE_TAG:
					return "VISIBLE_STRING";
				case GENERAL_STRING_TYPE_TAG:
					return "GENERAL_STRING";
				case UNIVERSAL_STRING_TYPE_TAG:
					return "UNIVERSAL_STRING";
				case BMP_STRING_TYPE_TAG:
					return "BMP_STRING";
				case UTC_TIME_TYPE_TAG:
					return "UTC_TIME";
				case GENERALIZED_TIME_TYPE_TAG:
					return "GENERAL_TIME";
				}
			} else {
				switch (tag & 0x1F) {
				case ENUMERATED_TYPE_TAG:
					return "ENUMERATED";
				case SEQUENCE_TYPE_TAG:
					return "SEQUENCE";
				case SET_TYPE_TAG:
					return "SET";
				}
			}
		}
		return "'0x" + Hex.intToHexString(tag) + "'";
	}
}