181a1e0a98
Now BIFF 5 & 8 should be possible to be generated in non Windows environment but this fact has not been tested. To use the older mode replace uses "fpolebasic" by "fpolestorage". Extensive tests are needed. git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@792 8e941d3f-bd1b-0410-a28a-d453659cc2b4
112 lines
2.8 KiB
ObjectPascal
112 lines
2.8 KiB
ObjectPascal
unit uvirtuallayer_stream;
|
|
|
|
{$mode objfpc}{$H+}
|
|
|
|
interface
|
|
|
|
uses
|
|
Classes, SysUtils,
|
|
uvirtuallayer_types;
|
|
|
|
type
|
|
|
|
{ TVirtualLayer_Stream }
|
|
|
|
TVirtualLayer_Stream=class(TStream)
|
|
private
|
|
FRootVirtualLayer: Pointer;
|
|
FHandle: TvlHandle;
|
|
protected
|
|
FFilename: UTF8String;
|
|
function GetPosition: Int64; override;
|
|
procedure SetPosition(const Pos: Int64); override;
|
|
{ function GetSize: Int64; virtual;
|
|
procedure SetSize64(const NewSize: Int64); virtual;
|
|
procedure SetSize(NewSize: Longint); virtual;overload;
|
|
procedure SetSize(const NewSize: Int64); virtual;overload;
|
|
}
|
|
public
|
|
property Filename: UTF8String Read FFilename;
|
|
function Read(var Buffer; Count: Longint): Longint; override;
|
|
function Write(const Buffer; Count: Longint): Longint; override;
|
|
function Seek(Offset: Longint; Origin: Word): Longint; override; overload;
|
|
function Seek(const Offset: Int64; Origin: TSeekOrigin): Int64; override; overload;
|
|
Constructor Create(const AVirtualLayer: Pointer; const AFileName: UTF8String;const AMode: cardinal);
|
|
Destructor Destroy(); override;
|
|
end;
|
|
|
|
implementation
|
|
|
|
uses uvirtuallayer;
|
|
|
|
function VL(L: Pointer): TVirtualLayer; inline;
|
|
begin
|
|
Result:=TVirtualLayer(L);
|
|
end;
|
|
|
|
{ TVirtualLayer_Stream }
|
|
|
|
function TVirtualLayer_Stream.GetPosition: Int64;
|
|
begin
|
|
Result:=VL(FRootVirtualLayer).Seek(FHandle,0,fsFromCurrent);
|
|
end;
|
|
|
|
procedure TVirtualLayer_Stream.SetPosition(const Pos: Int64);
|
|
var
|
|
NewPos: int64;
|
|
begin
|
|
NewPos:=VL(FRootVirtualLayer).Seek(FHandle,Pos,fsFromBeginning);
|
|
if NewPos<0 Then begin
|
|
//Raise exception ??? which one :-?
|
|
end;
|
|
end;
|
|
|
|
function TVirtualLayer_Stream.Read(var Buffer; Count: Longint): Longint;
|
|
begin
|
|
Result:=VL(FRootVirtualLayer).Read(FHandle,@Buffer,Count);
|
|
end;
|
|
|
|
function TVirtualLayer_Stream.Write(const Buffer; Count: Longint): Longint;
|
|
begin
|
|
Result:=VL(FRootVirtualLayer).Write(FHandle,@Buffer,Count);
|
|
end;
|
|
|
|
function TVirtualLayer_Stream.Seek(Offset: Longint; Origin: Word): Longint;
|
|
begin
|
|
Result:=VL(FRootVirtualLayer).Seek(FHandle,Offset,Origin);
|
|
end;
|
|
|
|
function TVirtualLayer_Stream.Seek(const Offset: Int64; Origin: TSeekOrigin): Int64;
|
|
var
|
|
Org: Word;
|
|
begin
|
|
Case Origin of
|
|
soCurrent: Org:=fsFromCurrent;
|
|
soEnd: Org:=fsFromEnd;
|
|
soBeginning:Org:=fsFromBeginning;
|
|
end;
|
|
Result:=VL(FRootVirtualLayer).Seek(FHandle,Offset,Org);
|
|
end;
|
|
|
|
constructor TVirtualLayer_Stream.Create(const AVirtualLayer: Pointer;
|
|
const AFileName: UTF8String; const AMode: cardinal);
|
|
begin
|
|
FRootVirtualLayer:=AVirtualLayer;
|
|
FHandle:=VL(FRootVirtualLayer).OpenFile(AFileName,AMode);
|
|
if FHandle=nil Then begin
|
|
Raise EStreamError.Create('Unable to open '+AFileName);
|
|
end;
|
|
FFilename:=AFileName;
|
|
end;
|
|
|
|
destructor TVirtualLayer_Stream.Destroy();
|
|
begin
|
|
if FHandle<>nil Then begin
|
|
VL(FRootVirtualLayer).CloseFile(FHandle);
|
|
end;
|
|
inherited Destroy();
|
|
end;
|
|
|
|
end.
|
|
|