/protocols/asn/asn-impl/src/main/java/org/mobicents/protocols/asn/Tag.java

http://mobicents.googlecode.com/ · Java · 109 lines · 58 code · 15 blank · 36 comment · 2 complexity · fd18c789ee5758dea93c5b1989a23d6a MD5 · raw file 

    

  1. /*
    2. 

  2.  * JBoss, Home of Professional Open Source
    3. 

  3.  * Copyright 2011, Red Hat, Inc. and individual contributors
    4. 

  4.  * by the @authors tag. See the copyright.txt in the distribution for a
    5. 

  5.  * full listing of individual contributors.
    6. 

  6.  *
    7. 

  7.  * This is free software; you can redistribute it and/or modify it
    8. 

  8.  * under the terms of the GNU Lesser General Public License as
    9. 

  9.  * published by the Free Software Foundation; either version 2.1 of
    10. 

  10.  * the License, or (at your option) any later version.
    11. 

  11.  *
    12. 

  12.  * This software is distributed in the hope that it will be useful,
    13. 

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    14. 

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    15. 

  15.  * Lesser General Public License for more details.
    16. 

  16.  *
    17. 

  17.  * You should have received a copy of the GNU Lesser General Public
    18. 

  18.  * License along with this software; if not, write to the Free
    19. 

  19.  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
    20. 

  20.  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
    21. 

  21.  */
    22. 

  22. 

  23. package org.mobicents.protocols.asn;
    24. 

  24. 

  25. /**
    26. 

  26.  * 
    27. 

  27.  * @author amit bhayani
    28. 

  28.  * @author baranowb
    29. 

  29.  */
    30. 

  30. public class Tag {
    31. 

  31. 	
    32. 

  32. 	/**
    33. 

  33. 	 * Class of tag used with primitives
    34. 

  34. 	 */
    35. 

  35. 	public static final int CLASS_UNIVERSAL = 0x0;
    36. 

  36. 	public static final int CLASS_APPLICATION = 0x1;
    37. 

  37. 	public static final int CLASS_CONTEXT_SPECIFIC = 0x2;
    38. 

  38. 	public static final int CLASS_PRIVATE = 0x3;
    39. 

  39. 

  40. 	// first two bits encode the class
    41. 

  41. 	public static final int CLASS_MASK = 0xC0;
    42. 

  42. 

  43. 	// The next bit (bit six) is called the primitive/constructed (P/C) bit
    44. 

  44. 	public static final int PC_MASK = 0x20;
    45. 

  45. 	public static final int PC_PRIMITIVITE = 0x0;
    46. 

  46. 	public static final int PC_CONSTRUCTED = 0x1;
    47. 

  47. 

  48. 	// The last five bits (bits 5 to 1) encode the number of the tag in tag octet
    49. 

  49. 	public static final int TAG_MASK = 0x1F;
    50. 

  50. 

  51. 	// Universal class tag assignments as per X.680-0207, Section 8.4
    52. 

  52. 	public static final int BOOLEAN = 0x01;
    53. 

  53. 	public static final int INTEGER = 0x02;
    54. 

  54. 	public static final int STRING_BIT = 0x03;
    55. 

  55. 	public static final int STRING_OCTET = 0x04;
    56. 

  56. 	public static final int NULL = 0x05;
    57. 

  57.     public static final int OBJECT_IDENTIFIER = 0x06;
    58. 

  58. 	public static final int OBJECT_DESCRIPTOR = 0x07;
    59. 

  59.     public static final int EXTERNAL = 0x08;
    60. 

  60. 	public static final int REAL = 0x09;
    61. 

  61. 	public static final int ENUMERATED = 0x0A;
    62. 

  62. 	public static final int EMBEDDED_PDV = 0x0B;
    63. 

  63. 	public static final int STRING_UTF8 = 0x0C;
    64. 

  64. 	public static final int RELATIVE_OID = 0x0D;
    65. 

  65. 	public static final int SEQUENCE = 0x10; 
    66. 

  66. 	public static final int SET = 0x11; 
    67. 

  67. 	public static final int STRING_NUMERIC = 0x12; 
    68. 

  68. 	public static final int STRING_PRINTABLE = 0x13; 
    69. 

  69. 	public static final int STRING_TELETEX = 0x14; 
    70. 

  70. 	public static final int STRING_VIDIOTEX = 0x15; 
    71. 

  71. 	public static final int STRING_IA5 = 0x16;
    72. 

  72. 	public static final int UTCTime = 0x17; 
    73. 

  73. 	public static final int GeneralizedTime = 0x18; 
    74. 

  74. 	public static final int STRING_GRAPHIC = 0x19;
    75. 

  75. 	public static final int STRING_VISIBLE = 0x1A; 
    76. 

  76. 	public static final int STRING_GENERAL = 0x1B; 
    77. 

  77. 	public static final int STRING_UNIVERSAL = 0x1C; 
    78. 

  78. 	public static final int STRING_CHARACTER = 0x1D; 
    79. 

  79. 	public static final int STRING_BMP = 0x1E; 
    80. 

  80. 	
    81. 

  81. 	//values for ending stream of string for constructed form, see 18.2.6 in ASN.1 Communication between Heterogeneous Systems
    82. 

  82. 	public static final int NULL_TAG = 0x00;
    83. 

  83. 	public static final int NULL_VALUE = 0x00;
    84. 

  84. 

  85. 	// value of indefinite length for readLength()
    86. 

  86. 	public static final int Indefinite_Length  = -1;
    87. 

  87. 

  88. 

  89. 	private Tag() {
    90. 

  90. 		super();
    91. 

  91. 	
    92. 

  92. 	}
    93. 

  93. 

  94. 

  95. 	public static boolean isPrimitive(int tagValue)
    96. 

  96. 	{
    97. 

  97. 		//no shift needed, since for primitive its '0'
    98. 

  98. 		return (tagValue & PC_MASK) == PC_PRIMITIVITE;
    99. 

  99. 	}
    100. 

  100. 

  101. 	public static int getSimpleTagValue(int tagValue)
    102. 

  102. 	{
    103. 

  103. 		return tagValue & TAG_MASK;
    104. 

  104. 	}
    105. 

  105. 	public static boolean isUniversal(int tagValue)
    106. 

  106. 	{
    107. 

  107. 		return (tagValue & CLASS_MASK) == CLASS_UNIVERSAL;
    108. 

  108. 	}
    109. 

  109. }
    110.