[457] | 1 | using System;
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| 2 |
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| 3 | namespace Lextm.SharpSnmpLib.Mib.Elements.Types
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| 4 | {
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| 5 | public sealed class TextualConvention : ITypeAssignment, ITypeReferrer
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| 6 | {
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| 7 | private IModule _module;
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| 8 | private string _name;
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| 9 | private DisplayHint _displayHint;
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| 10 | private Status _status;
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| 11 | private string _description;
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| 12 | private string _reference;
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| 13 | private ITypeAssignment _syntax;
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| 14 |
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| 15 | [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA1801:ReviewUnusedParameters", MessageId = "module")]
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| 16 | public TextualConvention(IModule module, string name, ISymbolEnumerator symbols)
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| 17 | {
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| 18 | _module = module;
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| 19 | _name = name;
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| 20 |
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| 21 | _displayHint = ParseDisplayHint(symbols);
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| 22 | _status = ParseStatus(symbols);
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| 23 | _description = ParseDescription(symbols);
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| 24 | _reference = ParseReference(symbols);
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| 25 | _syntax = ParseSyntax(module, symbols);
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| 26 | }
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| 27 |
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| 28 | private static DisplayHint ParseDisplayHint(ISymbolEnumerator symbols)
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| 29 | {
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| 30 | Symbol current = symbols.NextNonEOLSymbol();
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| 31 |
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| 32 | if (current == Symbol.DisplayHint)
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| 33 | {
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| 34 | return new DisplayHint(symbols.NextNonEOLSymbol().ToString().Trim(new char[] { '"' }));
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| 35 | }
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| 36 |
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| 37 | symbols.PutBack(current);
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| 38 | return null;
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| 39 | }
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| 40 |
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| 41 | private static Status ParseStatus(ISymbolEnumerator symbols)
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| 42 | {
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| 43 | Symbol current = symbols.NextNonEOLSymbol();
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| 44 | current.Expect(Symbol.Status);
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| 45 |
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| 46 | try
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| 47 | {
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| 48 | return (Status)Enum.Parse(typeof(Status), symbols.NextNonEOLSymbol().ToString());
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| 49 | }
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| 50 | catch (ArgumentException)
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| 51 | {
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| 52 | current.Assert(false, "Invalid/Unknown status");
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| 53 | }
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| 54 |
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| 55 | return Status.current;
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| 56 | }
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| 57 |
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| 58 | private static string ParseDescription(ISymbolEnumerator symbols)
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| 59 | {
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| 60 | Symbol current = symbols.NextNonEOLSymbol();
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| 61 | current.Expect(Symbol.Description);
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| 62 |
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| 63 | return symbols.NextNonEOLSymbol().ToString().Trim(new char[] { '"' });
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| 64 | }
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| 65 |
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| 66 | private static string ParseReference(ISymbolEnumerator symbols)
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| 67 | {
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| 68 | Symbol current = symbols.NextNonEOLSymbol();
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| 69 |
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| 70 | if (current == Symbol.Reference)
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| 71 | {
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| 72 | string reference = symbols.NextNonEOLSymbol().ToString();
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| 73 | if ((reference.Length >= 2) && reference.StartsWith("\"") && reference.EndsWith("\""))
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| 74 | {
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| 75 | return reference.Substring(1, reference.Length-2);
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| 76 | }
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| 77 |
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| 78 | return reference;
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| 79 | }
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| 80 |
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| 81 | symbols.PutBack(current);
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| 82 | return null;
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| 83 | }
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| 84 |
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| 85 | private static ITypeAssignment ParseSyntax(IModule module, ISymbolEnumerator symbols)
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| 86 | {
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| 87 | Symbol current = symbols.NextNonEOLSymbol();
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| 88 | current.Expect(Symbol.Syntax);
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| 89 |
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| 90 | /*
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| 91 | * RFC2579 definition:
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| 92 | * Syntax ::= -- Must be one of the following:
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| 93 | * -- a base type (or its refinement), or
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| 94 | * -- a BITS pseudo-type
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| 95 | * type
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| 96 | * | "BITS" "{" NamedBits "}"
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| 97 | *
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| 98 | * From section 3.5:
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| 99 | * The data structure must be one of the alternatives defined
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| 100 | * in the ObjectSyntax CHOICE or the BITS construct. Note
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| 101 | * that this means that the SYNTAX clause of a Textual
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| 102 | * Convention can not refer to a previously defined Textual
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| 103 | * Convention.
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| 104 | *
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| 105 | * The SYNTAX clause of a TEXTUAL CONVENTION macro may be
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| 106 | * sub-typed in the same way as the SYNTAX clause of an
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| 107 | * OBJECT-TYPE macro.
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| 108 | *
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| 109 | * Therefore the possible values are (grouped by underlying type):
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| 110 | * INTEGER, Integer32
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| 111 | * OCTET STRING, Opaque
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| 112 | * OBJECT IDENTIFIER
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| 113 | * IpAddress
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| 114 | * Counter64
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| 115 | * Unsigned32, Counter32, Gauge32, TimeTicks
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| 116 | * BITS
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| 117 | * With appropriate sub-typing.
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| 118 | */
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| 119 |
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| 120 | return Lexer.ParseBasicTypeDef(module, String.Empty, symbols, isMacroSyntax: true);
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| 121 | }
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| 122 |
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| 123 | public IModule Module
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| 124 | {
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| 125 | get { return _module; }
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| 126 | }
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| 127 |
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| 128 | public string Name
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| 129 | {
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| 130 | get { return _name; }
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| 131 | }
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| 132 |
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| 133 | public string DisplayHint
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| 134 | {
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| 135 | get { return _displayHint == null ? null : _displayHint.ToString(); }
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| 136 | }
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| 137 |
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| 138 | public Status Status
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| 139 | {
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| 140 | get { return _status; }
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| 141 | }
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| 142 |
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| 143 | public string Description
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| 144 | {
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| 145 | get { return _description; }
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| 146 | }
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| 147 |
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| 148 | public string Reference
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| 149 | {
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| 150 | get { return _reference; }
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| 151 | }
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| 152 |
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| 153 | public ITypeAssignment Syntax
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| 154 | {
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| 155 | get { return _syntax; }
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| 156 | }
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| 157 |
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| 158 | //internal object Decode(Variable v)
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| 159 | //{
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| 160 | // if (_syntax is IntegerType)
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| 161 | // {
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| 162 | // Integer32 i = v.Data as Integer32;
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| 163 | // if (i == null || (_syntax as IntegerType).IsEnumeration)
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| 164 | // {
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| 165 | // return null;
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| 166 | // }
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| 167 | // else if (_displayHint != null)
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| 168 | // {
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| 169 | // return _displayHint.Decode(i.ToInt32());
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| 170 | // }
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| 171 | // else
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| 172 | // {
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| 173 | // return i.ToInt32();
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| 174 | // }
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| 175 | // }
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| 176 | // else if (_syntax is UnsignedType)
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| 177 | // {
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| 178 | // Integer32 i = v.Data as Integer32;
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| 179 | // if (i == null)
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| 180 | // {
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| 181 | // return null;
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| 182 | // }
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| 183 | // else if (_displayHint != null)
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| 184 | // {
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| 185 | // return _displayHint.Decode(i.ToInt32());
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| 186 | // }
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| 187 | // else
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| 188 | // {
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| 189 | // return i.ToInt32();
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| 190 | // }
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| 191 | // }
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| 192 | // else if (_syntax is OctetStringType)
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| 193 | // {
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| 194 | // OctetString o = v.Data as OctetString;
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| 195 | // if (o == null)
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| 196 | // {
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| 197 | // return null;
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| 198 | // }
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| 199 | // else
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| 200 | // {
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| 201 | // // TODO: Follow the format specifier for octet strings.
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| 202 | // return null;
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| 203 | // }
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| 204 | // }
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| 205 | // else
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| 206 | // {
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| 207 | // return null;
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| 208 | // }
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| 209 | //}
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| 210 |
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| 211 | #region ITypeReferrer Member
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| 212 |
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| 213 | public ITypeAssignment ReferredType
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| 214 | {
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| 215 | get { return _syntax; }
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| 216 | set { _syntax = value; }
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| 217 | }
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| 218 |
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| 219 | public ITypeAssignment BaseType
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| 220 | {
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| 221 | get
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| 222 | {
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| 223 | ITypeReferrer tr = this;
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| 224 | ITypeAssignment result = this;
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| 225 |
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| 226 | while ((tr != null) && (tr.ReferredType != null))
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| 227 | {
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| 228 | result = tr.ReferredType;
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| 229 | tr = tr.ReferredType as ITypeReferrer;
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| 230 | }
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| 231 |
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| 232 | return result;
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| 233 | }
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| 234 | }
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| 235 |
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| 236 | #endregion
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| 237 | }
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| 238 | }
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