/usr/src/castle-game-engine-5.2.0/base/castlezstream.pas is in castle-game-engine-src 5.2.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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$Id: zstream.pp,v 1.6 2005/02/14 17:13:15 peter Exp $
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2000 by the Free Pascal development team
Implementation of compression streams.
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.
**********************************************************************}
{ Streams using zlib compression.
This is adjusted from FPC sources unit fcl/inc/zstream.pp,
to use our CastleGzioInternal unit. It is also cut down to TGZFileStream,
the only class useful for reading/writing gz files. }
unit CastleZStream;
interface
uses
Sysutils, Classes, CastleGzioInternal;
type
EZlibError = class(EStreamError);
TGZFileStream = Class(TOwnerStream)
private
FWriteMode : boolean;
FFIle : gzfile;
public
Constructor Create(const Stream: TStream; const AWriteMode: boolean);
Destructor Destroy;override;
Function Read(Var Buffer; Count : longint): longint;override;
function Write(const Buffer; Count: Longint): Longint; override;
function Seek(Offset: Longint; Origin: Word): Longint; override;
end;
implementation
Const
SReadOnlyStream = 'Decompression streams are read-only';
SWriteOnlyStream = 'Compression streams are write-only';
SSeekError = 'Compression stream seek error';
// TGZFileStream
Constructor TGZFileStream.Create(const Stream: TStream; const AWriteMode: boolean);
begin
inherited Create(Stream);
SourceOwner := true;
FWriteMode := AWriteMode;
FFile:=gzopen (Stream, AWriteMode);
end;
Destructor TGZFileStream.Destroy;
begin
If FFile <> nil then
gzclose(FFile);
Inherited Destroy;
end;
Function TGZFileStream.Read(Var Buffer; Count : longint): longint;
begin
If FWriteMode then
Raise ezliberror.create(SWriteOnlyStream);
Result:=gzRead(FFile,@Buffer,Count);
if Result < 0 then
raise EZlibError.Create('Gzip decompression error: ' + gzerror(FFile));
end;
function TGZFileStream.Write(const Buffer; Count: Longint): Longint;
begin
If not FWriteMode then
Raise EzlibError.Create(SReadonlyStream);
Result:=gzWrite(FFile,@Buffer,Count);
if Result < 0 then
raise EZlibError.Create('Gzip compression error: ' + gzerror(FFile));
end;
function TGZFileStream.Seek(Offset: Longint; Origin: Word): Longint;
begin
Result:=gzseek(FFile,Offset,Origin);
If Result=-1 then
Raise eZlibError.Create(SSeekError);
end;
end.
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