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{
This file is part of the Free Component Library (FCL)
Copyright (c) 1999-2000 by the Free Pascal development team
This unit converts a stream to a regular text file.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
unit StreamIO;
interface
uses Classes,SysUtils;
Procedure AssignStream(var F: Textfile; Stream: TStream);
Function GetStream(var F: TTextRec) : TStream;
implementation
ResourceString
SErrNilStream = 'Can not assign file to Nil stream';
Type
PStream = ^TStream;
{ ---------------------------------------------------------------------
Text IO functions
---------------------------------------------------------------------}
Function StreamRead(var F: TTextRec) : longint;
begin
Result:=0;
With F do
Try
Bufend:=GetStream(F).Read(BufPtr^,BufSize);
BufPos:=0;
except
Result:=100;
end;
end;
Function StreamWrite(var F: TTextRec ): longint;
begin
Result:=0;
with F do
if (BufPos>0) then
try
GetStream(F).WriteBuffer(BufPtr^,BufPos);
BufPos:=0;
except
Result:=101;
end;
end;
Function StreamFlush(var F: TTextRec): longint;
begin
Result:=0;
end;
Function StreamClose(var F: TTextRec): longint;
begin
Result:=0;
end;
Function StreamOpen(var F: TTextRec ): longint;
begin
Result := 0;
with F do
begin
BufPos:=0;
Bufend:=0;
case Mode of
fmInput:
begin
InOutFunc:=@StreamRead;
FlushFunc:=@StreamFlush;
end;
fmOutput,fmAppend:
begin
InOutFunc:=@StreamWrite;
FlushFunc:=@StreamWrite;
if mode=fmAppend then
Try
GetStream(F).Seek(0,soFromEnd);
except
Result:=156;
end;
end;
end;
end;
end;
{ ---------------------------------------------------------------------
Public functions
---------------------------------------------------------------------}
Procedure AssignStream(var F: Textfile; Stream : TStream);
Var
E : EInoutError;
begin
if (Stream=Nil) then
begin
E:=EInOutError.Create(SErrNilStream);
E.ErrorCode:=6;
Raise E;
end;
with TTextRec(F) do
begin
OpenFunc:=@StreamOpen;
CloseFunc:=@StreamClose;
Case DefaultTextLineBreakStyle Of
tlbsLF: TextRec(f).LineEnd := #10;
tlbsCRLF: TextRec(f).LineEnd := #13#10;
tlbsCR: TextRec(f).LineEnd := #13;
End;
PStream(@UserData)^:=Stream;
Mode:=fmClosed;
BufSize:=SizeOf(Buffer);
BufPtr:=@Buffer;
Name[0]:=#0;
end;
end;
Function GetStream(var F: TTextRec) : TStream;
begin
Result:=PStream(@F.Userdata)^;
end;
end.
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