141 lines
3.5 KiB
Plaintext
141 lines
3.5 KiB
Plaintext
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unit BufUnit;
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{$I-,R-,S-,Q-}
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(*
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**
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** Large char-buffer handling routines for EleCOM
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**
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** Copyright (c) 1998-2002 by Maarten Bekers
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**
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** Version : 1.03
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** Created : 05-Jan-1999
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** Last update : 12-Jan-2003
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**
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**
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*)
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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INTERFACE
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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Type CharBufType = Array[0..65520] of Char;
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type BufArrayObj = Object
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TxtArr : CharBufType;
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TxtMaxLen : Longint;
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TxtStartPtr: Longint; { Start of buffer ptr }
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CurTxtPtr : Longint; { Maximum data entered yet }
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TmpBuf : CharBufType;
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constructor Init(TxtSize: Longint);
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destructor Done;
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function BufRoom: Longint;
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function BufUsed: Longint;
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function Put(var Buf; Size: Longint): Longint;
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function Get(var Buf; Size: Longint; Remove: Boolean): Longint;
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procedure Clear;
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end; { BufArrayObj }
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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IMPLEMENTATION
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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constructor BufArrayObj.Init(TxtSize: Longint);
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begin
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TxtMaxLen := TxtSize;
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CurTxtPtr := -1;
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TxtStartPtr := 0;
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FillChar(TxtArr, TxtMaxLen, #00);
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FillChar(TmpBuf, TxtMaxLen, #00);
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end; { constructor Init }
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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destructor BufArrayObj.Done;
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begin
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end; { destructor Done }
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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function BufArrayObj.BufRoom: Longint;
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begin
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BufRoom := (TxtMaxLen - (CurTxtPtr + 1));
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end; { func. BufRoom }
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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function BufArrayObj.BufUsed: Longint;
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begin
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BufUsed := (CurTxtPtr + 01);
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end; { func. BufUsed }
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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function BufArrayObj.Put(var Buf; Size: Longint): Longint;
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var RetSize: Longint;
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begin
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Put := 0;
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if Size < 0 then EXIT;
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if TxtStartPtr > 0 then
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if (CurTxtPtr + TxtStartPtr) > TxtMaxLen then
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begin
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Move(TxtArr[TxtStartPtr], TxtArr[0], Succ(CurTxtPtr));
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TxtStartPtr := 0;
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end; { if }
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if Size > BufRoom then RetSize := BufRoom
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else RetSize := Size;
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Move(Buf, TxtArr[TxtStartPtr + BufUsed], RetSize);
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Inc(CurTxtPtr, RetSize);
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TxtArr[TxtStartPtr + BufUsed + 1] := #0;
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Put := RetSize;
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end; { func. Put }
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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function BufArrayObj.Get(var Buf; Size: Longint; Remove: Boolean): Longint;
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var RetSize: Longint;
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begin
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Get := 0;
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if Size < 0 then EXIT;
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if Size > BufUsed then RetSize := BufUsed
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else RetSize := Size;
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Move(TxtArr[TxtStartPtr], Buf, RetSize);
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Get := RetSize;
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if Remove then
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begin
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if RetSize = BufUsed then
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begin
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CurTxtPtr := -1;
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TxtStartPtr := 0;
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TxtArr[0] := #0;
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end
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else begin
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Inc(TxtStartPtr, RetSize);
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Dec(CurTxtPtr, RetSize);
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TxtArr[CurTxtPtr + TxtStartPtr + 1] := #0;
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end; { if }
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end; { if }
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end; { func. Get }
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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procedure BufArrayObj.Clear;
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begin
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CurTxtPtr := -1;
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end; { proc. Clear }
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(*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-+-*-*)
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end.
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