mirror of
https://gitlab.com/freepascal.org/fpc/source.git
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821 lines
18 KiB
PHP
821 lines
18 KiB
PHP
{
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$Id$
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This file is part of the Free Component Library (FCL)
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Copyright (c) 1999-2000 by the Free Pascal development team
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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{****************************************************************************}
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{* TStream *}
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{****************************************************************************}
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{$ifdef seek64bit}
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function TStream.GetPosition: Int64;
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begin
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Result:=Seek(0,soCurrent);
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end;
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procedure TStream.SetPosition(Pos: Int64);
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begin
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Seek(pos,soBeginning);
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end;
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procedure TStream.SetSize64(NewSize: Int64);
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begin
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// Required because can't use overloaded functions in properties
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SetSize(NewSize);
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end;
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function TStream.GetSize: Int64;
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var
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p : longint;
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begin
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p:=GetPosition;
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GetSize:=Seek(0,soEnd);
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Seek(p,soBeginning);
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end;
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procedure TStream.SetSize(NewSize: Longint);
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begin
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// We do nothing. Pipe streams don't support this
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// As wel as possible read-ony streams !!
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end;
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procedure TStream.SetSize(NewSize: Int64);
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begin
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// Backwards compatibility that calls the longint SetSize
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if (NewSize<Low(longint)) or
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(NewSize>High(longint)) then
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raise ERangeError.Create(SRangeError);
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SetSize(longint(NewSize));
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end;
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function TStream.Seek(Offset: Longint; Origin: Word): Longint;
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type
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TSeek64 = function(offset:Int64;Origin:TSeekorigin):Int64 of object;
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var
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CurrSeek,
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TStreamSeek : TSeek64;
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CurrClass : TClass;
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begin
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// Redirect calls to 64bit Seek, but we can't call the 64bit Seek
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// from TStream, because then we end up in an infinite loop
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CurrSeek:=nil;
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CurrClass:=Classtype;
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while (CurrClass<>nil) and
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(CurrClass<>TStream) do
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CurrClass:=CurrClass.Classparent;
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if CurrClass<>nil then
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begin
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CurrSeek:=@Self.Seek;
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TStreamSeek:=@TStream(@CurrClass).Seek;
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if TMethod(TStreamSeek).Code=TMethod(CurrSeek).Code then
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CurrSeek:=nil;
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end;
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if CurrSeek<>nil then
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Result:=Seek(Int64(offset),TSeekOrigin(origin))
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else
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raise EStreamError.CreateFmt(SSeekNotImplemented,[ClassName]);
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end;
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function TStream.Seek(Offset: Int64; Origin: TSeekorigin): Int64;
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begin
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// Backwards compatibility that calls the longint Seek
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if (Offset<Low(longint)) or
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(Offset>High(longint)) then
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raise ERangeError.Create(SRangeError);
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Result:=Seek(longint(Offset),ord(Origin));
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end;
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{$else seek64bit}
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function TStream.GetPosition: Longint;
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begin
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Result:=Seek(0,soFromCurrent);
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end;
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procedure TStream.SetPosition(Pos: Longint);
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begin
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Seek(pos,soFromBeginning);
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end;
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function TStream.GetSize: Longint;
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var
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p : longint;
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begin
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p:=GetPosition;
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GetSize:=Seek(0,soFromEnd);
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Seek(p,soFromBeginning);
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end;
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procedure TStream.SetSize(NewSize: Longint);
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begin
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// We do nothing. Pipe streams don't support this
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// As wel as possible read-ony streams !!
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end;
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{$endif seek64bit}
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procedure TStream.ReadBuffer(var Buffer; Count: Longint);
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begin
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if Read(Buffer,Count)<Count then
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Raise EReadError.Create(SReadError);
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end;
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procedure TStream.WriteBuffer(const Buffer; Count: Longint);
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begin
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if Write(Buffer,Count)<Count then
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Raise EWriteError.Create(SWriteError);
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end;
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function TStream.CopyFrom(Source: TStream; Count: Int64): Int64;
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var
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i : Int64;
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buffer : array[0..1023] of byte;
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begin
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CopyFrom:=0;
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If (Count=0) then
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begin
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// This WILL fail for non-seekable streams...
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Source.Position:=0;
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Count:=Source.Size;
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end;
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while Count>0 do
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begin
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if (Count>sizeof(buffer)) then
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i:=sizeof(Buffer)
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else
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i:=Count;
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i:=Source.Read(buffer,i);
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i:=Write(buffer,i);
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dec(count,i);
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CopyFrom:=CopyFrom+i;
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end;
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end;
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function TStream.ReadComponent(Instance: TComponent): TComponent;
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var
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Reader: TReader;
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begin
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Reader := TReader.Create(Self, 4096);
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try
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Result := Reader.ReadRootComponent(Instance);
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finally
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Reader.Free;
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end;
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end;
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function TStream.ReadComponentRes(Instance: TComponent): TComponent;
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begin
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ReadResHeader;
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Result := ReadComponent(Instance);
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end;
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procedure TStream.WriteComponent(Instance: TComponent);
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begin
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WriteDescendent(Instance, nil);
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end;
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procedure TStream.WriteComponentRes(const ResName: string; Instance: TComponent);
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begin
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WriteDescendentRes(ResName, Instance, nil);
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end;
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procedure TStream.WriteDescendent(Instance, Ancestor: TComponent);
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var
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Driver : TAbstractObjectWriter;
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Writer : TWriter;
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begin
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Driver := TBinaryObjectWriter.Create(Self, 4096);
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Try
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Writer := TWriter.Create(Driver);
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Try
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Writer.WriteDescendent(Instance, Ancestor);
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Finally
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Writer.Destroy;
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end;
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Finally
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Driver.Free;
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end;
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end;
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procedure TStream.WriteDescendentRes(const ResName: string; Instance, Ancestor: TComponent);
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var
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FixupInfo: Integer;
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begin
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{ Write a resource header }
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WriteResourceHeader(ResName, FixupInfo);
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{ Write the instance itself }
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WriteDescendent(Instance, Ancestor);
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{ Insert the correct resource size into the resource header }
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FixupResourceHeader(FixupInfo);
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end;
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procedure TStream.WriteResourceHeader(const ResName: string; {!!!: out} var FixupInfo: Integer);
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begin
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{ Numeric resource type }
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WriteByte($ff);
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{ Application defined data }
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WriteWord($0a);
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{ write the name as asciiz }
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WriteBuffer(ResName[1],length(ResName));
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WriteByte(0);
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{ Movable, Pure and Discardable }
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WriteWord($1030);
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{ Placeholder for the resource size }
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WriteDWord(0);
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{ Return current stream position so that the resource size can be
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inserted later }
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FixupInfo := Position;
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end;
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procedure TStream.FixupResourceHeader(FixupInfo: Integer);
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var
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ResSize : Integer;
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begin
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ResSize := Position - FixupInfo;
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{ Insert the correct resource size into the placeholder written by
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WriteResourceHeader }
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Position := FixupInfo - 4;
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WriteDWord(ResSize);
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{ Seek back to the end of the resource }
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Position := FixupInfo + ResSize;
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end;
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procedure TStream.ReadResHeader;
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begin
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try
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{ application specific resource ? }
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if ReadByte<>$ff then
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raise EInvalidImage.Create(SInvalidImage);
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if ReadWord<>$000a then
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raise EInvalidImage.Create(SInvalidImage);
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{ read name }
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while ReadByte<>0 do
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;
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{ check the access specifier }
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if ReadWord<>$1030 then
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raise EInvalidImage.Create(SInvalidImage);
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{ ignore the size }
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ReadDWord;
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except
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on EInvalidImage do
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raise;
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else
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raise EInvalidImage.create(SInvalidImage);
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end;
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end;
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function TStream.ReadByte : Byte;
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var
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b : Byte;
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begin
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ReadBuffer(b,1);
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ReadByte:=b;
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end;
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function TStream.ReadWord : Word;
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var
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w : Word;
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begin
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ReadBuffer(w,2);
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ReadWord:=w;
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end;
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function TStream.ReadDWord : Cardinal;
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var
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d : Cardinal;
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begin
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ReadBuffer(d,4);
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ReadDWord:=d;
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end;
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Function TStream.ReadAnsiString : String;
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Type
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PByte = ^Byte;
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Var
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TheSize : Longint;
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P : PByte ;
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begin
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ReadBuffer (TheSize,SizeOf(TheSize));
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SetLength(Result,TheSize);
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// Illegal typecast if no AnsiStrings defined.
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if TheSize>0 then
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begin
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ReadBuffer (Pointer(Result)^,TheSize);
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P:=Pointer(Result)+TheSize;
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p^:=0;
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end;
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end;
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Procedure TStream.WriteAnsiString (S : String);
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Var L : Longint;
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begin
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L:=Length(S);
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WriteBuffer (L,SizeOf(L));
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WriteBuffer (Pointer(S)^,L);
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end;
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procedure TStream.WriteByte(b : Byte);
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begin
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WriteBuffer(b,1);
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end;
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procedure TStream.WriteWord(w : Word);
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begin
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WriteBuffer(w,2);
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end;
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procedure TStream.WriteDWord(d : Cardinal);
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begin
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WriteBuffer(d,4);
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end;
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{****************************************************************************}
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{* THandleStream *}
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{****************************************************************************}
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Constructor THandleStream.Create(AHandle: Integer);
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begin
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FHandle:=AHandle;
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end;
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function THandleStream.Read(var Buffer; Count: Longint): Longint;
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begin
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Result:=FileRead(FHandle,Buffer,Count);
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If Result=-1 then Result:=0;
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end;
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function THandleStream.Write(const Buffer; Count: Longint): Longint;
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begin
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Result:=FileWrite (FHandle,Buffer,Count);
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If Result=-1 then Result:=0;
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end;
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{$ifdef seek64bit}
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Procedure THandleStream.SetSize(NewSize: Longint);
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begin
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SetSize(Int64(NewSize));
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end;
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Procedure THandleStream.SetSize(NewSize: Int64);
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begin
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FileTruncate(FHandle,NewSize);
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end;
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function THandleStream.Seek(Offset: Int64; Origin: TSeekOrigin): Int64;
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begin
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Result:=FileSeek(FHandle,Offset,ord(Origin));
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end;
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{$else seek64bit}
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Procedure THandleStream.SetSize(NewSize: Longint);
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begin
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FileTruncate(FHandle,NewSize);
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end;
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function THandleStream.Seek(Offset: Longint; Origin: Word): Longint;
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begin
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Result:=FileSeek(FHandle,Offset,Origin);
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end;
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{$endif seek64bit}
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{****************************************************************************}
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{* TFileStream *}
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{****************************************************************************}
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constructor TFileStream.Create(const AFileName: string; Mode: Word);
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begin
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FFileName:=AFileName;
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If Mode=fmcreate then
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FHandle:=FileCreate(AFileName)
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else
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FHAndle:=FileOpen(AFileName,Mode);
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If FHandle<0 then
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If Mode=fmcreate then
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raise EFCreateError.createfmt(SFCreateError,[AFileName])
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else
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raise EFOpenError.Createfmt(SFOpenError,[AFilename]);
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end;
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constructor TFileStream.Create(const AFileName: string; Mode: Word; Rights: Cardinal);
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begin
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FFileName:=AFileName;
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If Mode=fmcreate then
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FHandle:=FileCreate(AFileName)
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else
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FHAndle:=FileOpen(AFileName,Mode);
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If FHandle<0 then
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If Mode=fmcreate then
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raise EFCreateError.createfmt(SFCreateError,[AFileName])
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else
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raise EFOpenError.Createfmt(SFOpenError,[AFilename]);
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end;
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destructor TFileStream.Destroy;
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begin
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FileClose(FHandle);
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end;
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{****************************************************************************}
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{* TCustomMemoryStream *}
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{****************************************************************************}
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procedure TCustomMemoryStream.SetPointer(Ptr: Pointer; ASize: Longint);
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begin
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FMemory:=Ptr;
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FSize:=ASize;
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end;
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function TCustomMemoryStream.Read(var Buffer; Count: Longint): Longint;
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begin
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Result:=0;
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If (FSize>0) and (FPosition<Fsize) then
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begin
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Result:=FSize-FPosition;
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If Result>Count then Result:=Count;
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Move ((FMemory+FPosition)^,Buffer,Result);
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FPosition:=Fposition+Result;
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end;
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end;
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|
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function TCustomMemoryStream.Seek(Offset: Longint; Origin: Word): Longint;
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begin
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Case Origin of
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soFromBeginning : FPosition:=Offset;
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soFromEnd : FPosition:=FSize+Offset;
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soFromCurrent : FpoSition:=FPosition+Offset;
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end;
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Result:=FPosition;
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end;
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procedure TCustomMemoryStream.SaveToStream(Stream: TStream);
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begin
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if FSize>0 then Stream.WriteBuffer (FMemory^,FSize);
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end;
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procedure TCustomMemoryStream.SaveToFile(const FileName: string);
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Var S : TFileStream;
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begin
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Try
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S:=TFileStream.Create (FileName,fmCreate);
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SaveToStream(S);
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finally
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S.free;
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end;
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end;
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|
|
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{****************************************************************************}
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{* TMemoryStream *}
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{****************************************************************************}
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|
|
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Const TMSGrow = 4096; { Use 4k blocks. }
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procedure TMemoryStream.SetCapacity(NewCapacity: Longint);
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begin
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SetPointer (Realloc(NewCapacity),Fsize);
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FCapacity:=NewCapacity;
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end;
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|
|
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function TMemoryStream.Realloc(var NewCapacity: Longint): Pointer;
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|
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Var MoveSize : Longint;
|
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|
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begin
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If NewCapacity>0 Then // round off to block size.
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NewCapacity := (NewCapacity + (TMSGrow-1)) and not (TMSGROW-1);
|
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// Only now check !
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If NewCapacity=FCapacity then
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Result:=FMemory
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else
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If NewCapacity=0 then
|
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FreeMem (FMemory,Fcapacity)
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|
else
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begin
|
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GetMem (Result,NewCapacity);
|
|
If Result=Nil then
|
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Raise EStreamError.Create(SMemoryStreamError);
|
|
If FCapacity>0 then
|
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begin
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MoveSize:=FSize;
|
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If MoveSize>NewCapacity then MoveSize:=NewCapacity;
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Move (Fmemory^,Result^,MoveSize);
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FreeMem (FMemory,FCapacity);
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end;
|
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end;
|
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end;
|
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|
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destructor TMemoryStream.Destroy;
|
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|
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begin
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Clear;
|
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Inherited Destroy;
|
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end;
|
|
|
|
|
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procedure TMemoryStream.Clear;
|
|
|
|
begin
|
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FSize:=0;
|
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FPosition:=0;
|
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SetCapacity (0);
|
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end;
|
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|
|
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procedure TMemoryStream.LoadFromStream(Stream: TStream);
|
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|
|
begin
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Stream.Position:=0;
|
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SetSize(Stream.Size);
|
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If FSize>0 then Stream.ReadBuffer(FMemory^,FSize);
|
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end;
|
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|
|
|
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procedure TMemoryStream.LoadFromFile(const FileName: string);
|
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|
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Var S : TFileStream;
|
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|
|
begin
|
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S:=TFileStream.Create (FileName,fmOpenRead);
|
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Try
|
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LoadFromStream(S);
|
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finally
|
|
S.free;
|
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end;
|
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end;
|
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|
|
|
|
procedure TMemoryStream.SetSize(NewSize: Longint);
|
|
|
|
begin
|
|
SetCapacity (NewSize);
|
|
FSize:=NewSize;
|
|
IF FPosition>FSize then
|
|
FPosition:=FSize;
|
|
end;
|
|
|
|
|
|
function TMemoryStream.Write(const Buffer; Count: Longint): Longint;
|
|
|
|
Var NewPos : Longint;
|
|
|
|
begin
|
|
If Count=0 then
|
|
exit(0);
|
|
NewPos:=FPosition+Count;
|
|
If NewPos>Fsize then
|
|
begin
|
|
IF NewPos>FCapacity then
|
|
SetCapacity (NewPos);
|
|
FSize:=Newpos;
|
|
end;
|
|
System.Move (Buffer,(FMemory+FPosition)^,Count);
|
|
FPosition:=NewPos;
|
|
Result:=Count;
|
|
end;
|
|
|
|
|
|
{****************************************************************************}
|
|
{* TStringStream *}
|
|
{****************************************************************************}
|
|
|
|
procedure TStringStream.SetSize(NewSize: Longint);
|
|
|
|
begin
|
|
Setlength(FDataString,NewSize);
|
|
If FPosition>NewSize then FPosition:=NewSize;
|
|
end;
|
|
|
|
|
|
constructor TStringStream.Create(const AString: string);
|
|
|
|
begin
|
|
Inherited create;
|
|
FDataString:=AString;
|
|
end;
|
|
|
|
|
|
function TStringStream.Read(var Buffer; Count: Longint): Longint;
|
|
|
|
begin
|
|
Result:=Length(FDataString)-FPosition;
|
|
If Result>Count then Result:=Count;
|
|
// This supposes FDataString to be of type AnsiString !
|
|
Move (Pchar(FDataString)[FPosition],Buffer,Result);
|
|
FPosition:=FPosition+Result;
|
|
end;
|
|
|
|
|
|
function TStringStream.ReadString(Count: Longint): string;
|
|
|
|
Var NewLen : Longint;
|
|
|
|
begin
|
|
NewLen:=Length(FDataString)-FPosition;
|
|
If NewLen>Count then NewLen:=Count;
|
|
SetLength(Result,NewLen);
|
|
Read (Pointer(Result)^,NewLen);
|
|
end;
|
|
|
|
|
|
function TStringStream.Seek(Offset: Longint; Origin: Word): Longint;
|
|
|
|
begin
|
|
Case Origin of
|
|
soFromBeginning : FPosition:=Offset;
|
|
soFromEnd : FPosition:=Length(FDataString)+Offset;
|
|
soFromCurrent : FpoSition:=FPosition+Offset;
|
|
end;
|
|
If FPosition>Length(FDataString) then FPosition:=Length(FDataString);
|
|
If FPosition<0 then FPosition:=0;
|
|
Result:=FPosition;
|
|
end;
|
|
|
|
|
|
function TStringStream.Write(const Buffer; Count: Longint): Longint;
|
|
|
|
begin
|
|
Result:=Count;
|
|
SetSize(FPosition+Count);
|
|
// This supposes that FDataString is of type AnsiString)
|
|
Move (Buffer,PCHar(FDataString)[Fposition],Count);
|
|
FPosition:=FPosition+Count;
|
|
end;
|
|
|
|
|
|
procedure TStringStream.WriteString(const AString: string);
|
|
|
|
begin
|
|
Write (PChar(Astring)[0],Length(AString));
|
|
end;
|
|
|
|
|
|
|
|
{****************************************************************************}
|
|
{* TResourceStream *}
|
|
{****************************************************************************}
|
|
|
|
procedure TResourceStream.Initialize(Instance: THandle; Name, ResType: PChar);
|
|
|
|
begin
|
|
end;
|
|
|
|
|
|
constructor TResourceStream.Create(Instance: THandle; const ResName: string; ResType: PChar);
|
|
|
|
begin
|
|
end;
|
|
|
|
|
|
constructor TResourceStream.CreateFromID(Instance: THandle; ResID: Integer; ResType: PChar);
|
|
|
|
begin
|
|
end;
|
|
|
|
|
|
destructor TResourceStream.Destroy;
|
|
|
|
begin
|
|
end;
|
|
|
|
|
|
function TResourceStream.Write(const Buffer; Count: Longint): Longint;
|
|
|
|
begin
|
|
Write:=0;
|
|
end;
|
|
|
|
|
|
{
|
|
$Log$
|
|
Revision 1.2 2003-10-30 16:30:53 peter
|
|
* merged copyfrom with 0
|
|
|
|
Revision 1.3 2003/10/28 22:04:29 michael
|
|
+ Fixed private seeksupport stuff
|
|
|
|
Revision 1.2 2003/10/26 14:52:29 michael
|
|
+ Fixed TStream.CopyFrom with Count=0
|
|
|
|
Revision 1.13 2003/07/26 16:20:50 michael
|
|
+ Fixed readstring from TStringStream (
|
|
|
|
Revision 1.12 2002/04/25 19:14:13 sg
|
|
* Fixed TStringStream.ReadString
|
|
|
|
Revision 1.11 2002/12/18 16:45:33 peter
|
|
* set function result in TStream.Seek(int64) found by Mattias Gaertner
|
|
|
|
Revision 1.10 2002/12/18 16:35:59 peter
|
|
* fix crash in Seek()
|
|
|
|
Revision 1.9 2002/12/18 15:51:52 michael
|
|
+ Hopefully fixed some issues with int64 seek
|
|
|
|
Revision 1.8 2002/10/22 09:38:39 michael
|
|
+ Fixed TmemoryStream.LoadFromStream, reported by Mattias Gaertner
|
|
|
|
Revision 1.7 2002/09/07 15:15:25 peter
|
|
* old logs removed and tabs fixed
|
|
|
|
}
|