1 | unit UBitStream;
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2 |
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3 | {$mode delphi}{$H+}
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4 |
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5 | interface
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6 |
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7 | uses
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8 | Classes, DateUtils, syncobjs, UObjectTypeBase, UObjectBoolean;
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9 |
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10 | type
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11 | { TMemoryBitStream }
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12 |
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13 | TMemoryBitStream = class(TInterfacedObject, IAssignable, IComparable)
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14 | private
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15 | FMemoryStream: TMemoryStream;
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16 | FPositionOffset: Byte;
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17 | FSizeOffset: Byte;
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18 | function GetBit(Bit: Longint): TBoolean;
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19 | function GetPosition:Int64;
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20 | function GetSize:Int64;
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21 | procedure SetBit(Bit: Longint;const AValue: TBoolean);
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22 | procedure SetPosition(const AValue: Int64);
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23 | procedure SetSize(const AValue: Int64);
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24 | public
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25 | procedure ReadBits(Bits: TMemoryBitStream; Count: Integer);
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26 | procedure WriteBits(Bits: TMemoryBitStream);
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27 |
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28 | procedure AndBy(Bits: TMemoryBitStream);
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29 | procedure OrBy(Bits: TMemoryBitStream);
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30 | procedure XorBy(Bits: TMemoryBitStream);
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31 | procedure NotBy(Bits: TMemoryBitStream);
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32 |
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33 | function Lookup(Bit: TBoolean): Integer;
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34 | procedure Reverse;
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35 | procedure Clear;
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36 | procedure Assign(Source: TInterfacedObject);
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37 | function EqualTo(Operand: IComparable): TBoolean;
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38 |
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39 | constructor Create;
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40 | destructor Destroy; override;
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41 |
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42 | property Position: Int64 read GetPosition write SetPosition;
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43 | property Size: Int64 read GetSize write SetSize;
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44 | property Bits[Bit: Longint]: TBoolean read GetBit write SetBit; default;
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45 | end;
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46 |
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47 | implementation
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48 |
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49 |
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50 | { TMemoryBitStream }
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51 |
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52 | function TMemoryBitStream.GetBit(Bit: Longint): TBoolean;
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53 | begin
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54 |
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55 | end;
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56 |
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57 | function TMemoryBitStream.GetPosition:Int64;
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58 | begin
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59 | Result := FMemoryStream.Position + FPositionOffset;
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60 | end;
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61 |
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62 | function TMemoryBitStream.GetSize:Int64;
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63 | begin
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64 |
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65 | end;
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66 |
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67 | procedure TMemoryBitStream.SetBit(Bit: Longint;const AValue: TBoolean);
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68 | begin
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69 | end;
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70 |
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71 | procedure TMemoryBitStream.SetPosition(const AValue: Int64);
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72 | begin
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73 | FMemoryStream.Position := AValue shr 3;
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74 | FPositionOffset := AValue and 7;
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75 | end;
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76 |
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77 | procedure TMemoryBitStream.SetSize(const AValue: Int64);
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78 | begin
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79 | FSizeOffset := AValue and 7;
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80 | if FSizeOffset = 0 then FMemoryStream.Size := (AValue shr 3)
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81 | else FMemoryStream.Size := (AValue shr 3) + 1;
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82 | end;
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83 |
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84 | procedure TMemoryBitStream.ReadBits(Bits:TMemoryBitStream;Count:Integer);
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85 | begin
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86 |
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87 | end;
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88 |
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89 | procedure TMemoryBitStream.WriteBits(Bits:TMemoryBitStream);
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90 | begin
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91 |
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92 | end;
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93 |
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94 | procedure TMemoryBitStream.AndBy(Bits:TMemoryBitStream);
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95 | begin
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96 |
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97 | end;
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98 |
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99 | procedure TMemoryBitStream.OrBy(Bits:TMemoryBitStream);
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100 | begin
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101 |
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102 | end;
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103 |
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104 | procedure TMemoryBitStream.XorBy(Bits:TMemoryBitStream);
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105 | begin
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106 |
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107 | end;
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108 |
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109 | procedure TMemoryBitStream.NotBy(Bits:TMemoryBitStream);
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110 | begin
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111 |
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112 | end;
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113 |
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114 | function TMemoryBitStream.Lookup(Bit:TBoolean):Integer;
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115 | begin
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116 | while (Position < Size) and (Bits[Position] <> Bit) do
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117 | Position := Position + 1;
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118 | if Position < Size then Result := Position
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119 | else Result := -1;
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120 | end;
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121 |
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122 | procedure TMemoryBitStream.Reverse;
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123 | begin
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124 |
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125 | end;
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126 |
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127 | procedure TMemoryBitStream.Clear;
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128 | begin
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129 | Size := 0;
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130 | Position := 0;
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131 | end;
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132 |
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133 | procedure TMemoryBitStream.Assign(Source:TInterfacedObject);
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134 | begin
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135 | if Assigned(Source) and (Source is TMemoryBitStream) then begin
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136 | FMemoryStream.LoadFromStream(TMemoryBitStream(Source).FMemoryStream);
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137 | FPositionOffset := TMemoryBitStream(Source).FPositionOffset;
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138 | FSizeOffset := TMemoryBitStream(Source).FSizeOffset;
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139 | end;
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140 | end;
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141 |
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142 | function TMemoryBitStream.EqualTo(Operand:IComparable):TBoolean;
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143 | begin
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144 |
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145 | end;
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146 |
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147 | constructor TMemoryBitStream.Create;
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148 | begin
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149 | FMemoryStream := TMemoryStream.Create;
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150 | end;
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151 |
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152 | destructor TMemoryBitStream.Destroy;
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153 | begin
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154 | FMemoryStream.Destroy;
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155 | inherited Destroy;
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156 | end;
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157 |
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158 | end.
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