1 | using System.Collections.Generic;
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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 | /**
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6 | * As this type is used for Counter32 and TimeTicks as well as Unsigned32
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7 | * and Gauge32 it incorrectly allows range restrictions of Counter32 and
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8 | * TimeTicks. This is ok as currently we do not care about detecting
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9 | * incorrect MIBs and this doesn't block the decoding of correct MIBs.
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10 | */
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11 | public class UnsignedType : BaseType
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12 | {
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13 | public enum Types
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14 | {
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15 | Unsigned32,
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16 | Gauge32,
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17 | Counter32,
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18 | TimeTicks,
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19 | Counter64,
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20 | }
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21 |
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22 | private Types _type;
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23 | private ValueRanges _ranges;
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24 |
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25 | public UnsignedType(IModule module, string name, Symbol type, ISymbolEnumerator symbols)
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26 | : base(module, name)
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27 | {
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28 | Types? t = GetExactType(type);
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29 | type.Assert(t.HasValue, "Unknown symbol for unsigned type!");
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30 | _type = t.Value;
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31 |
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32 | Symbol current = symbols.NextNonEOLSymbol();
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33 | if (current == Symbol.OpenParentheses)
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34 | {
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35 | current.Assert((_type != Types.Counter64), "Ranges are not supported for Counter64 type!"); // our internal struct can only hold int64 values
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36 |
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37 | symbols.PutBack(current);
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38 | _ranges = Lexer.DecodeRanges(symbols);
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39 | current.Assert(!_ranges.IsSizeDeclaration, "SIZE keyword is not allowed for ranges of unsigned types!");
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40 | }
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41 | else
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42 | {
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43 | symbols.PutBack(current);
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44 | }
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45 | }
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46 |
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47 | public Types Type
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48 | {
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49 | get { return _type; }
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50 | }
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51 |
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52 | public ValueRanges Ranges
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53 | {
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54 | get { return _ranges; }
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55 | }
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56 |
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57 | internal static Types? GetExactType(Symbol symbol)
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58 | {
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59 | if (symbol == Symbol.Unsigned32)
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60 | {
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61 | // [APPLICATION 2] IMPLICIT INTEGER (0..4294967295) // from SNMPv2-SMI
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62 | return Types.Unsigned32;
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63 | }
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64 | else if (symbol == Symbol.Gauge32)
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65 | {
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66 | // [APPLICATION 2] IMPLICIT INTEGER (0..4294967295) // from SNMPv2-SMI
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67 | return Types.Gauge32;
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68 | }
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69 | else if (symbol == Symbol.Counter32)
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70 | {
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71 | // [APPLICATION 1] IMPLICIT INTEGER (0..4294967295) // from SNMPv2-SMI
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72 | return Types.Counter32;
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73 | }
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74 | else if (symbol == Symbol.TimeTicks)
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75 | {
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76 | // [APPLICATION 3] IMPLICIT INTEGER (0..4294967295) // from SNMPv2-SMI + RFC1155-SMI
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77 | return Types.TimeTicks;
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78 | }
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79 | else if (symbol == Symbol.Gauge)
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80 | {
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81 | // [APPLICATION 2] IMPLICIT INTEGER (0..4294967295) // from RFC1155-SMI
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82 | return Types.Gauge32;
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83 | }
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84 | else if (symbol == Symbol.Counter)
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85 | {
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86 | // [APPLICATION 1] IMPLICIT INTEGER (0..4294967295) // from RFC1155-SMI
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87 | return Types.Counter32;
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88 | }
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89 | else if (symbol == Symbol.Counter64)
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90 | {
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91 | // [APPLICATION 6] IMPLICIT INTEGER (0..18446744073709551615) // from SNMPv2-SMI
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92 | return Types.Counter64;
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93 | }
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94 |
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95 | return null;
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96 | }
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97 |
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98 | internal static bool IsUnsignedType(Symbol symbol)
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99 | {
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100 | return GetExactType(symbol).HasValue;
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101 | }
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102 | }
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103 | }
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