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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 282 2017-02-05 10:02:46Z 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) + "'";
  }
}