1 | {$INCLUDE Switches.inc}
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2 | unit CmdList;
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3 |
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4 | interface
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5 |
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6 | uses
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7 | Classes, SysUtils, Math;
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8 |
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9 | const
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10 | MaxDataSize = 1024;
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11 | CommandDataElementSize = 4;
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12 | CommandDataElementCountMask = $F;
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13 | CommandDataMaxSize = CommandDataElementSize * CommandDataElementCountMask;
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14 |
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15 | type
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16 | TLogData = array [0 .. 999999999] of Byte;
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17 |
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18 | TCmdListState = record
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19 | nLog: Integer; { used size of LogData in bytes }
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20 | LoadPos: Integer; { position in LogData when loading a game }
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21 | LastMovingUnit: Integer;
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22 | MoveCode: Cardinal;
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23 | LoadMoveCode: Cardinal;
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24 | end;
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25 |
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26 | TCmdList = class
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27 | constructor Create;
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28 | destructor Destroy; override;
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29 | procedure Get(var Command, Player, Subject: Integer; var Data: Pointer);
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30 | procedure GetDataChanges(Data: Pointer; DataSize: Integer);
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31 | procedure Put(Command, Player, Subject: Integer; Data: Pointer);
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32 | procedure PutDataChanges(Command, Player: Integer;
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33 | OldData, NewData: Pointer; DataSize: Integer);
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34 | procedure LoadFromFile(const F: TFileStream);
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35 | procedure SaveToFile(const F: TFileStream);
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36 | procedure AppendToFile(const F: TFileStream; const OldState: TCmdListState);
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37 | procedure Cut;
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38 | function Progress: Integer;
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39 | private
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40 | LogAlloc: Integer; { allocated size of LogData in bytes }
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41 | LogData: ^TLogData;
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42 | FState: TCmdListState;
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43 | procedure PutData(Data: Pointer; Length: Integer);
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44 | procedure CompleteMoveCode;
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45 | public
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46 | property State: TCmdListState read FState write FState;
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47 | end;
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48 |
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49 | function CommandWithData(Command: Integer; DataSize: Byte): Integer;
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50 |
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51 | resourcestring
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52 | SCommandDataSizeError = 'Command data size %d out of range (0-%d).';
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53 |
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54 |
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55 | implementation
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56 |
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57 | uses
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58 | Protocol;
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59 |
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60 | const
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61 | LogGrow = 1 shl 18;
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62 |
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63 | type
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64 | TData = array [0..MaxDataSize - 1] of Cardinal;
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65 | PData = ^TData;
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66 |
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67 | function CommandWithData(Command: Integer; DataSize: Byte): Integer;
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68 | var
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69 | DataElementCount: Byte;
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70 | begin
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71 | if DataSize > CommandDataMaxSize then
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72 | raise Exception.Create(Format(SCommandDataSizeError, [DataSize, CommandDataMaxSize]));
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73 | DataElementCount := Ceil(DataSize / CommandDataElementSize);
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74 | Result := Command or (DataElementCount and CommandDataElementCountMask);
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75 | end;
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76 |
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77 | constructor TCmdList.Create;
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78 | begin
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79 | inherited;
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80 | FState.nLog := 0;
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81 | LogAlloc := 0;
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82 | LogData := nil;
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83 | FState.LastMovingUnit := -1;
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84 | FState.MoveCode := 0;
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85 | FState.LoadMoveCode := 0;
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86 | end;
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87 |
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88 | destructor TCmdList.Destroy;
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89 | begin
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90 | ReallocMem(LogData, 0);
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91 | inherited;
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92 | end;
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93 |
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94 | procedure TCmdList.Get(var Command, Player, Subject: Integer; var Data: Pointer);
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95 | var
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96 | DirCode: Cardinal;
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97 | Code: Cardinal;
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98 | begin
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99 | if FState.LoadMoveCode > 0 then
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100 | begin
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101 | Player := -1;
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102 | if FState.LoadMoveCode and 1 = 1 then
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103 | begin // FM
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104 | DirCode := FState.LoadMoveCode shr 1 and 7;
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105 | Subject := FState.LastMovingUnit;
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106 | FState.LoadMoveCode := FState.LoadMoveCode shr 4;
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107 | end
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108 | else
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109 | begin // M
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110 | DirCode := FState.LoadMoveCode shr 3 and 7;
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111 | Subject := FState.LoadMoveCode shr 6 and $FFF;
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112 | FState.LoadMoveCode := FState.LoadMoveCode shr 18;
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113 | FState.LastMovingUnit := Subject
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114 | end;
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115 | case DirCode of
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116 | 0: Command := sMoveUnit + $090;
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117 | 1: Command := sMoveUnit + $0F0;
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118 | 2: Command := sMoveUnit + $390;
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119 | 3: Command := sMoveUnit + $3F0;
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120 | 4: Command := sMoveUnit + $020;
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121 | 5: Command := sMoveUnit + $060;
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122 | 6: Command := sMoveUnit + $100;
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123 | 7: Command := sMoveUnit + $300;
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124 | end;
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125 | Data := nil;
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126 | end
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127 | else
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128 | begin
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129 | Code := Cardinal((@LogData[FState.LoadPos])^);
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130 | if Code and 3 = 0 then
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131 | begin // non-clientex command
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132 | Command := Code shr 2 and $3FFF + sExecute;
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133 | Player := Code shr 16 and $F;
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134 | Subject := Code shr 20 and $FFF;
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135 | Inc(FState.LoadPos, 4);
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136 | end
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137 | else if Code and 7 = 2 then
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138 | begin // clientex command
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139 | Command := Code shr 3 and $FFFF;
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140 | Player := Code shr 19 and $F;
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141 | Subject := 0;
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142 | Inc(FState.LoadPos, 3);
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143 | end
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144 | else
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145 | begin // move command shortcut
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146 | if (Code and 1 = 1) and (Code and (7 shl 4) <> 6 shl 4) then
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147 | begin
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148 | FState.LoadMoveCode := Code and $FF;
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149 | Inc(FState.LoadPos);
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150 | end
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151 | else
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152 | begin
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153 | FState.LoadMoveCode := Code and $FFFFFF;
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154 | Inc(FState.LoadPos, 3);
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155 | end;
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156 | Get(Command, Player, Subject, Data);
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157 | Exit;
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158 | end;
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159 |
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160 | if Command and CommandDataElementCountMask = 0 then
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161 | Data := nil
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162 | else
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163 | begin
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164 | Data := @LogData[FState.LoadPos];
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165 | Inc(FState.LoadPos, Command and CommandDataElementCountMask * CommandDataElementSize);
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166 | end;
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167 | end;
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168 | end;
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169 |
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170 | procedure TCmdList.GetDataChanges(Data: Pointer; DataSize: Integer);
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171 | var
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172 | b0, b1: Integer;
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173 | Map0, Map1: Cardinal;
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174 | begin
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175 | Map0 := Cardinal((@LogData[FState.LoadPos])^);
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176 | Inc(FState.LoadPos, 4);
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177 | b0 := 0;
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178 | while Map0 > 0 do begin
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179 | if Map0 and 1 <> 0 then begin
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180 | Map1 := Cardinal((@LogData[FState.LoadPos])^);
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181 | Inc(FState.LoadPos, 4);
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182 | for b1 := 0 to 31 do
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183 | if 1 shl b1 and Map1 <> 0 then begin
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184 | if b0 * 32 + b1 < DataSize then
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185 | PData(Data)[b0 * 32 + b1] := Cardinal((@LogData[FState.LoadPos])^);
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186 | Inc(FState.LoadPos, 4);
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187 | end;
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188 | end;
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189 | Inc(b0);
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190 | Map0 := Map0 shr 1;
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191 | end;
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192 | end;
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193 |
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194 | procedure TCmdList.Put(Command, Player, Subject: Integer; Data: Pointer);
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195 | var
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196 | DirCode, Code: Cardinal;
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197 | begin
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198 | if Command and $FC00 = sMoveUnit then
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199 | begin // move command shortcut
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200 | case Command of
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201 | sMoveUnit + $090: DirCode := 0;
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202 | sMoveUnit + $0F0: DirCode := 1;
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203 | sMoveUnit + $390: DirCode := 2;
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204 | sMoveUnit + $3F0: DirCode := 3;
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205 | sMoveUnit + $020: DirCode := 4;
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206 | sMoveUnit + $060: DirCode := 5;
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207 | sMoveUnit + $100: DirCode := 6;
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208 | sMoveUnit + $300: DirCode := 7;
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209 | end;
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210 | if Subject = FState.LastMovingUnit then
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211 | Code := 1 + DirCode shl 1
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212 | else
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213 | Code := 6 + DirCode shl 3 + Cardinal(Subject) shl 6;
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214 | if FState.MoveCode = 0 then
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215 | FState.MoveCode := Code
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216 | else if FState.MoveCode and 1 = 1 then
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217 | begin // FM + this
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218 | FState.MoveCode := FState.MoveCode + Code shl 4;
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219 | if Code and 1 = 1 then
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220 | PutData(@FState.MoveCode, 1) // FM + FM
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221 | else
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222 | PutData(@FState.MoveCode, 3); // FM + M
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223 | FState.MoveCode := 0;
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224 | end
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225 | else if Code and 1 = 1 then
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226 | begin // M + FM
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227 | FState.MoveCode := FState.MoveCode + Code shl 18;
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228 | PutData(@FState.MoveCode, 3);
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229 | FState.MoveCode := 0;
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230 | end
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231 | else // M + M
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232 | begin
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233 | PutData(@FState.MoveCode, 3);
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234 | FState.MoveCode := Code;
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235 | end;
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236 | FState.LastMovingUnit := Subject;
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237 | end
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238 | else
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239 | begin
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240 | CompleteMoveCode;
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241 | if Command >= cClientEx then
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242 | begin
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243 | Code := 2 + Command shl 3 + Player shl 19;
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244 | PutData(@Code, 3);
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245 | end
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246 | else
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247 | begin
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248 | Code := Cardinal(Command - sExecute) shl 2 + Cardinal(Player) shl 16 +
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249 | Cardinal(Subject) shl 20;
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250 | PutData(@Code, 4);
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251 | end;
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252 | end;
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253 | if Command and CommandDataElementCountMask <> 0 then
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254 | PutData(Data, Command and CommandDataElementCountMask * CommandDataElementSize);
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255 | end;
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256 |
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257 | procedure TCmdList.PutDataChanges(Command, Player: Integer;
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258 | OldData, NewData: Pointer; DataSize: Integer);
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259 | var
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260 | MapPos, LogPos, b0, b1, RowEnd: Integer;
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261 | Map0, Map1, Code: Cardinal;
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262 | begin
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263 | if DataSize <= 0 then
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264 | Exit;
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265 | if DataSize > MaxDataSize then
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266 | DataSize := MaxDataSize;
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267 | CompleteMoveCode;
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268 | MapPos := FState.nLog + 8;
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269 | LogPos := MapPos + 4;
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270 | Map0 := 0;
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271 | for b0 := 0 to (DataSize - 1) div 32 do
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272 | begin
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273 | if LogPos + 4 * 32 > LogAlloc then
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274 | begin
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275 | Inc(LogAlloc, LogGrow);
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276 | ReallocMem(LogData, LogAlloc);
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277 | end;
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278 | Map0 := Map0 shr 1;
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279 | Map1 := 0;
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280 | RowEnd := DataSize - 1;
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281 | if RowEnd > b0 * 32 + 31 then
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282 | RowEnd := b0 * 32 + 31;
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283 | for b1 := b0 * 32 to RowEnd do
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284 | begin
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285 | Map1 := Map1 shr 1;
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286 | if PData(NewData)[b1] <> PData(OldData)[b1] then
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287 | begin
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288 | Cardinal((@LogData[LogPos])^) := PData(NewData)[b1];
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289 | Inc(LogPos, 4);
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290 | Inc(Map1, $80000000);
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291 | end;
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292 | end;
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293 | if Map1 > 0 then
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294 | begin
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295 | Map1 := Map1 shr (b0 * 32 + 31 - RowEnd);
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296 | Cardinal((@LogData[MapPos])^) := Map1;
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297 | MapPos := LogPos;
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298 | Inc(LogPos, 4);
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299 | Inc(Map0, $80000000);
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300 | end;
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301 | end;
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302 | if Map0 = 0 then
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303 | Exit; // no changes
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304 |
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305 | Map0 := Map0 shr (31 - (DataSize - 1) div 32);
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306 | Cardinal((@LogData[FState.nLog + 4])^) := Map0;
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307 | Code := Cardinal(Command - sExecute) shl 2 + Cardinal(Player) shl 16;
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308 | Cardinal((@LogData[FState.nLog])^) := Code;
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309 | FState.nLog := MapPos;
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310 | end;
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311 |
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312 | procedure TCmdList.PutData(Data: Pointer; Length: Integer);
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313 | begin
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314 | if FState.nLog + Length > LogAlloc then
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315 | begin
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316 | Inc(LogAlloc, LogGrow);
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317 | ReallocMem(LogData, LogAlloc);
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318 | end;
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319 | Move(Data^, LogData[FState.nLog], Length);
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320 | Inc(FState.nLog, Length);
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321 | end;
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322 |
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323 | procedure TCmdList.CompleteMoveCode;
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324 | begin
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325 | if FState.MoveCode > 0 then
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326 | begin
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327 | if FState.MoveCode and 1 = 1 then
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328 | PutData(@FState.MoveCode, 1) // Single FM
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329 | else
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330 | PutData(@FState.MoveCode, 3); // Single M
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331 | FState.MoveCode := 0;
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332 | end;
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333 | end;
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334 |
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335 | procedure TCmdList.LoadFromFile(const F: TFileStream);
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336 | begin
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337 | F.Read(FState.nLog, 4);
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338 | LogData := nil;
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339 | LogAlloc := ((FState.nLog + 2) div LogGrow + 1) * LogGrow;
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340 | ReallocMem(LogData, LogAlloc);
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341 | F.Read(LogData^, FState.nLog);
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342 | FState.LoadPos := 0;
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343 | end;
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344 |
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345 | procedure TCmdList.SaveToFile(const F: TFileStream);
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346 | begin
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347 | CompleteMoveCode;
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348 | F.Write(FState.nLog, 4);
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349 | F.Write(LogData^, FState.nLog);
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350 | end;
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351 |
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352 | procedure TCmdList.AppendToFile(const F: TFileStream;
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353 | const OldState: TCmdListState);
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354 | begin
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355 | CompleteMoveCode;
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356 | F.Write(FState.nLog, 4);
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357 | F.Position := F.Position + OldState.nLog;
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358 | F.Write(LogData[OldState.nLog], FState.nLog - OldState.nLog);
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359 | end;
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360 |
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361 | procedure TCmdList.Cut;
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362 | begin
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363 | FState.nLog := FState.LoadPos;
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364 | end;
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365 |
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366 | function TCmdList.Progress: Integer;
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367 | begin
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368 | if (FState.LoadPos = FState.nLog) and (FState.LoadMoveCode = 0) then
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369 | Result := 1000 // loading complete
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370 | else if FState.nLog > 1 shl 20 then
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371 | Result := (FState.LoadPos shr 8) * 999 div (FState.nLog shr 8)
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372 | else
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373 | Result := FState.LoadPos * 999 div FState.nLog;
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374 | end;
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375 |
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376 | { Format Specification:
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377 |
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378 | Non-ClientEx-Command:
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379 | Byte3 Byte2 Byte1 Byte0
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380 | ssssssss sssspppp cccccccc cccccc00
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381 | (C = Command-sExecute, P = Player, S = Subject)
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382 |
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383 | ClientEx-Command:
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384 | Byte2 Byte1 Byte0
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385 | 0ppppccc cccccccc ccccc010
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386 | (C = Command, P = Player)
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387 |
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388 | Single Move:
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389 | Byte2 Byte1 Byte0
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390 | 000000ss ssssssss ssaaa110
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391 | (A = Direction, S = Subject)
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392 |
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393 | Move + Follow Move:
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394 | Byte2 Byte1 Byte0
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395 | 00bbb1ss ssssssss ssaaa110
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396 | (A = Direction 1, S = Subject 1, B = Direction 2)
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397 |
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398 | Follow Move + Move:
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399 | Byte2 Byte1 Byte0
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400 | 00ssssss ssssssbb b110aaa1
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401 | (A = Direction 1, B = Direction 2, S = Subject 2)
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402 |
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403 | Single Follow Move:
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404 | Byte0
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405 | 0000aaa1
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406 | (A = Direction)
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407 |
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408 | Double Follow Move:
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409 | Byte0
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410 | bbb1aaa1
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411 | (A = Direction 1, B = Direction 2)
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412 | }
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413 |
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414 | end.
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