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mysticbbs
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534
mdl/m_fileio.pas
534
mdl/m_fileio.pas
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@ -1,16 +1,7 @@
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{
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Mystic Software Development Library
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===========================================================================
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File | M_FILEIO.PAS
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Desc | File IO related functions
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Created | August 22, 2002
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---------------------------------------------------------------------------
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}
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Unit m_FileIO;
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{$I M_OPS.PAS}
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Unit m_FileIO;
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Interface
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{ FILE ACCESS FUNCTIONS }
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@ -63,53 +54,48 @@ Const
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fmRWDR = 50;
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fmRWDW = 34;
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{ BUFFERED FILE IO CLASS DEFINITION }
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{ STREAMING CLASS OPTIONS }
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Const
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TMaxBufferSize = 64 * 1024 - 1; // Maximum of 64KB buffer for IO class
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MaxFileBufferSize = 64 * 1024;
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Type
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TBufFileOpenType = (
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TFileBufferOpenType = (
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fmOpen,
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fmOpenCreate,
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fmCreate
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);
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PBufFileBuffer = ^TBufFileBuffer;
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TBufFileBuffer = Array[0..TMaxBufferSize] of Byte;
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PFileBufferRec = ^TFileBufferRec;
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TFileBufferRec = Array[0..MaxFileBufferSize - 1] of Char;
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TBufFile = Class
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Private
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BufFile : File;
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Buffer : PBufFileBuffer;
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Opened : Boolean;
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BufDirty : Boolean;
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BufFilePos : Longint;
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RecordSize : LongInt;
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BufSize : LongInt;
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BufPos : LongInt;
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BufTop : LongInt;
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TFileBuffer = Class
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BufSize : LongInt;
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Buffer : PFileBufferRec;
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BufRead : LongInt;
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BufStart : LongInt;
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BufEnd : LongInt;
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BufPos : LongInt;
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InFile : File;
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BufEOF : Boolean;
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BufDirty : Boolean;
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IsOpened : Boolean;
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Procedure FillBuffer;
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Procedure FlushBuffer;
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Public
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IOResult : Integer;
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Constructor Create (BS: Word);
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Constructor Create (BufferSize: LongInt);
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Destructor Destroy; Override;
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Function Open (FN: String; OM: TBufFileOpenType; FM: Byte; RS: Word) : Boolean;
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Procedure Close;
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Procedure Reset;
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Function EOF : Boolean;
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Function OpenStream (FN: String; OpenType: TFileBufferOpenType; OpenMode: Byte) : Boolean;
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Procedure CloseStream;
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Function Read : Char;
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Procedure BlockRead (Var Buf; Size: LongInt; Var Count: LongInt); Overload;
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Procedure BlockRead (Var Buf; Size: LongInt); Overload;
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Procedure BlockWrite (Var Buf; Size: LongInt);
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Procedure Seek (FP : LongInt);
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Function FilePos : LongInt;
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Function FileSize : LongInt;
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Procedure Seek (Pos : LongInt);
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Procedure Read (Var V);
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Procedure Write (Var V);
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Procedure BlockRead (Var V; Count: LongInt; Var Result: LongInt);
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Procedure BlockWrite (Var V; Count: LongInt; Var Result: LongInt);
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Procedure RecordInsert (RecNum: LongInt);
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Procedure RecordDelete (RecNum: LongInt);
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Function EOF : Boolean;
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Procedure FillBuffer;
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Procedure FlushBuffer;
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End;
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Implementation
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@ -502,287 +488,6 @@ Begin
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Result := ((Attr And Directory) = Directory);
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End;
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{ BEGIN BUFFERED FILE IO CLASS HERE ======================================= }
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Constructor TBufFile.Create (BS: Word);
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Begin
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Inherited Create;
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Opened := False;
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BufDirty := False;
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BufFilePos := 0;
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RecordSize := 0;
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BufSize := BS;
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BufPos := 0;
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BufTop := 0;
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If BufSize > TMaxBufferSize + 1 Then Fail;
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GetMem (Buffer, BufSize);
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If Buffer = Nil Then Fail;
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End;
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Destructor TBufFile.Destroy;
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Begin
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If Opened Then Close;
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If Buffer <> Nil Then FreeMem (Buffer, BufSize);
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Inherited Destroy;
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End;
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Function TBufFile.Open (FN: String; OM: TBufFileOpenType; FM: Byte; RS: Word) : Boolean;
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Begin
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If Opened Then Close;
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Result := False;
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RecordSize := RS;
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BufFilePos := 0;
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BufPos := 0;
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BufTop := 0;
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System.Assign (BufFile, FN);
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If System.IoResult <> 0 Then Exit;
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System.FileMode := FM;
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Case OM of
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fmOpen : Begin
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{$I-} System.Reset(BufFile, 1); {$I+}
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If System.IoResult <> 0 Then Exit;
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FillBuffer;
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End;
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fmOpenCreate: Begin
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{$I-} System.Reset(BufFile, 1); {$I+}
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If System.IoResult <> 0 Then Begin
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{$I-} System.ReWrite(BufFile, 1); {$I+}
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If System.IoResult <> 0 Then Exit;
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End Else
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FillBuffer;
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End;
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fmCreate : Begin
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{$I-} System.ReWrite(BufFile, 1); {$I+}
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If IoResult <> 0 Then Exit;
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End;
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End;
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Result := True;
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Opened := True;
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End;
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Procedure TBufFile.Close;
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Begin
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If BufDirty Then FlushBuffer;
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System.Close(BufFile);
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IOResult := System.IoResult;
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Opened := False;
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End;
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Function TBufFile.EOF : Boolean;
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Begin
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Result := FilePos >= FileSize;
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End;
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Function TBufFile.FileSize : Longint;
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Begin
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Result := System.FileSize(BufFile) DIV RecordSize;
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End;
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Function TBufFile.FilePos : Longint;
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Begin
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Result := (BufFilePos + BufPos) DIV RecordSize;
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End;
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Procedure TBufFile.Reset;
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Begin
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If BufDirty Then FlushBuffer;
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System.Seek(BufFile, 0);
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BufFilePos := 0;
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BufPos := 0;
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FillBuffer;
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End;
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Procedure TBufFile.Seek (Pos: Longint);
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Begin
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Pos := Pos * RecordSize;
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If (Pos >= BufFilePos + BufSize) or (Pos < BufFilePos) Then Begin
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If BufDirty Then FlushBuffer;
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System.Seek(BufFile, Pos);
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BufFilePos := Pos;
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BufPos := 0;
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FillBuffer;
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End Else
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BufPos := Pos - BufFilePos;
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IoResult := System.IoResult;
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End;
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Procedure TBufFile.Read (Var V);
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Var
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Offset : Word;
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Begin
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If BufPos + RecordSize > BufTop Then Begin
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Offset := BufSize - BufPos;
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Move(Buffer^[BufPos], V, Offset);
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Inc(BufFilePos, BufSize);
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BufPos:= 0;
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FillBuffer;
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Move(Buffer^[BufPos], TBufFileBuffer(V)[Offset], RecordSize - Offset);
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BufPos:= BufPos + RecordSize - Offset;
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End Else Begin
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Move(Buffer^[BufPos], V, RecordSize);
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Inc(BufPos, RecordSize);
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End;
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IoResult := System.IoResult;
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End;
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Procedure TBufFile.BlockRead (Var V; Count: LongInt; Var Result: LongInt);
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Begin
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Result := 0;
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While (Result < Count) and (IoResult = 0) And Not EOF Do Begin
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Read (TBufFileBuffer(V)[Result * RecordSize]);
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Inc (Result);
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End;
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End;
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Procedure TBufFile.Write (Var V);
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Var
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Offset : Word;
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Begin
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BufDirty := True;
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If BufPos + RecordSize > BufSize Then Begin
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Offset := BufSize - BufPos;
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If Offset > 0 Then
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Move(V, Buffer^[BufPos], Offset);
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BufTop := BufSize;
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FlushBuffer;
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Inc(BufFilePos, BufSize);
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BufPos:= 0;
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FillBuffer;
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Move (TBufFileBuffer(V)[Offset], Buffer^[BufPos], RecordSize - Offset);
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BufPos := BufPos + RecordSize - Offset;
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End Else Begin
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Move (V, Buffer^[BufPos], RecordSize);
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Inc (BufPos, RecordSize);
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End;
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If BufTop < BufPos Then BufTop := BufPos;
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IoResult := System.IoResult;
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End;
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Procedure TBufFile.BlockWrite (Var V; Count: LongInt; Var Result: LongInt);
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Begin
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Result := 0;
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While (Result < Count) And (IoResult = 0) Do Begin
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Write (TBufFileBuffer(V)[Result * RecordSize]);
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Inc (Result);
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End;
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End;
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Procedure TBufFile.FillBuffer;
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Begin
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System.Seek (BufFile, BufFilePos);
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System.BlockRead (BufFile, Buffer^, BufSize, BufTop);
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IoResult := System.IoResult;
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If IoResult = 0 Then BufDirty := False;
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End;
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Procedure TBufFile.FlushBuffer;
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Begin
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System.Seek (BufFile, BufFilePos);
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System.BlockWrite (BufFile, Buffer^, BufTop, BufTop);
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IoResult := System.IoResult;
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// BufPos := 0;
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End;
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Procedure TBufFile.RecordInsert (RecNum: LongInt);
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Var
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TempBuf : PBufFileBuffer;
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Count : LongInt;
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Begin
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If (RecNum < 1) or (RecNum > FileSize + 1) Then Exit;
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GetMem (TempBuf, RecordSize);
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Dec (RecNum);
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Reset;
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For Count := FileSize - 1 DownTo RecNum Do Begin
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System.Seek (BufFile, Count * RecordSize);
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System.BlockRead (BufFile, TempBuf^, RecordSize);
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System.BlockWrite (BufFile, TempBuf^, RecordSize);
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End;
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Seek (RecNum);
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FillBuffer;
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FreeMem (TempBuf, RecordSize);
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End;
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Procedure TBufFile.RecordDelete (RecNum: LongInt);
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Var
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TempBuf : PBufFileBuffer;
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Count : LongInt;
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Begin
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If (RecNum < 1) or (RecNum > FileSize) Then Exit;
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GetMem (TempBuf, RecordSize);
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Dec (RecNum);
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Reset;
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For Count := RecNum To FileSize - 2 Do Begin
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System.Seek (BufFile, Succ(Count) * RecordSize);
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System.BlockRead (BufFile, TempBuf^, RecordSize);
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System.Seek (BufFile, Count * RecordSize);
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System.BlockWrite (BufFile, TempBuf^, RecordSize);
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End;
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System.Seek (BufFile, Pred(FileSize) * RecordSize);
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System.Truncate (BufFile);
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Seek (RecNum);
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FillBuffer;
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FreeMem (TempBuf, RecordSize);
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End;
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Function FileFind (FN: String) : String;
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Var
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Dir : SearchRec;
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@ -847,4 +552,185 @@ Begin
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Result := FN + '.' + NewExt;
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End;
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{ FILE STREAMING FUNCTIONS }
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Constructor TFileBuffer.Create (BufferSize: LongInt);
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Begin
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Inherited Create;
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BufSize := BufferSize;
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BufStart := 0;
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BufEnd := 0;
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BufPos := 0;
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BufEOF := False;
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BufRead := 0;
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Buffer := NIL;
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BufDirty := False;
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IsOpened := False;
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End;
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Destructor TFileBuffer.Destroy;
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Begin
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If IsOpened Then CloseStream;
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End;
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Function TFileBuffer.OpenStream (FN: String; OpenType: TFileBufferOpenType; OpenMode: Byte) : Boolean;
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Begin
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Result := False;
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If IsOpened Then CloseStream;
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Assign (InFile, FN);
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Case OpenType of
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fmOpen : If Not ioReset (InFile, 1, OpenMode) Then Exit;
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fmOpenCreate : If Not ioReset (InFile, 1, OpenMode) Then
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If Not FileExist(FN) Then Begin
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If Not ioReWrite (InFile, 1, OpenMode) Then Exit;
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End Else
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Exit;
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fmCreate : If Not ioReWrite (InFile, 1, OpenMode) Then Exit;
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End;
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GetMem (Buffer, BufSize);
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FillBuffer;
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BufDirty := False;
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IsOpened := True;
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Result := True;
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End;
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Procedure TFileBuffer.CloseStream;
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Begin
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If IsOpened Then Begin
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If BufDirty Then FlushBuffer;
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System.Close (InFile);
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End;
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If Assigned(Buffer) Then Begin
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FreeMem (Buffer, BufSize);
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Buffer := NIL;
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End;
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IsOpened := False;
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End;
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Function TFileBuffer.FilePos : LongInt;
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Begin
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FilePos := BufStart + BufPos;
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End;
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Procedure TFileBuffer.FillBuffer;
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Var
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Start : LongInt;
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Begin
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Start := System.FilePos(InFile);
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System.BlockRead (InFile, Buffer^[0], BufSize, BufRead);
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BufStart := Start;
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BufEnd := Start + BufRead;
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BufPos := 0;
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BufEOF := System.EOF(InFile);
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End;
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Function TFileBuffer.Read : Char;
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Begin
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If BufPos >= BufSize Then FillBuffer;
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Read := Buffer^[BufPos];
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Inc (BufPos);
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End;
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Procedure TFileBuffer.BlockWrite (Var Buf; Size: LongInt);
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Var
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Offset : LongInt;
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Begin
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If BufPos + Size > BufSize Then Begin
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Offset := BufSize - BufPos;
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If Offset > 0 Then
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Move(Buf, Buffer^[BufPos], Offset);
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FlushBuffer;
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FillBuffer;
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Move (TFileBufferRec(Buf)[Offset], Buffer^[BufPos], Size - Offset);
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BufPos := BufPos + Size - Offset;
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End Else Begin
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Move (Buf, Buffer^[BufPos], Size);
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Inc (BufPos, Size);
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End;
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If BufPos > BufEnd Then BufEnd := BufPos;
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If BufPos > BufRead Then BufRead := BufPos;
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BufDirty := True;
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End;
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|
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Procedure TFileBuffer.BlockRead (Var Buf; Size: LongInt);
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Var
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Res : LongInt;
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Begin
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BlockRead(Buf, Size, Res);
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End;
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Procedure TFileBuffer.BlockRead (Var Buf; Size: LongInt; Var Count: LongInt);
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Begin
|
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If BufPos + Size >= BufRead Then Begin
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If BufDirty Then FlushBuffer;
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|
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If Size > BufSize Then Size := BufSize;
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|
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System.Seek(InFile, BufStart + BufPos);
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|
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FillBuffer;
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|
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If BufRead < Size Then Size := BufRead;
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End;
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|
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Move (Buffer^[BufPos], Buf, Size);
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Inc (BufPos, Size);
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|
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Count := Size;
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End;
|
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|
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Procedure TFileBuffer.Seek (FP : LongInt);
|
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Begin
|
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If (FP >= BufStart) and (FP < BufEnd) Then
|
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BufPos := (BufEnd - (BufEnd - FP)) - BufStart
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Else Begin
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If BufDirty Then FlushBuffer;
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|
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System.Seek(InFile, FP);
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|
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FillBuffer;
|
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End;
|
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End;
|
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|
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Function TFileBuffer.EOF : Boolean;
|
||||
Begin
|
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EOF := (BufStart + BufPos >= BufEnd) and BufEOF;
|
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End;
|
||||
|
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Function TFileBuffer.FileSize : LongInt;
|
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Begin
|
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FileSize := System.FileSize(InFile);
|
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End;
|
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|
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Procedure TFileBuffer.FlushBuffer;
|
||||
Var
|
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Res : LongInt;
|
||||
Begin
|
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System.Seek (InFile, BufStart);
|
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System.BlockWrite (InFile, Buffer^, BufRead, Res);
|
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|
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BufDirty := False;
|
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End;
|
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|
||||
End.
|
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|
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|
|||
|
|
@ -196,7 +196,7 @@ Begin
|
|||
Repeat Until Server <> NIL; // Synchronize with server class
|
||||
Repeat Until ServerStatus <> NIL; // Syncronize with status class
|
||||
|
||||
Server.WaitInit(Port);
|
||||
Server.WaitInit('0.0.0.0', Port);
|
||||
|
||||
If Terminated Then Exit;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue