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apLib.pas
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apLib.pas
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(*
* aPLib compression library - the smaller the better :)
*
* Delphi aPLib wrapper for example
*
* Copyright (c) 1998-2004 by Joergen Ibsen / Jibz
* All Rights Reserved
*
* http://www.ibsensoftware.com/
*
* -> Delphi by Solodovnikov Alexey 21.03.1999 ([email protected])
*)
unit aPLib;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
//(*$IFDEF DYNAMIC_VERSION*)
// aPLibud;
//(*$ELSE*)
aPLibu;
//(*$ENDIF*)
const
aP_pack_break : DWORD = 0;
aP_pack_continue : DWORD = 1;
aPLib_Error : DWORD = DWORD(-1); (* indicates error compressing/decompressing *)
type
TaPLib = class(TComponent)
private
FWorkMem : Pointer;
FLength : DWORD;
FSource : Pointer;
FDestination : Pointer;
protected
public
CallBack : TaPack_Status;
procedure Pack;
procedure DePack;
property Source : Pointer read FSource write FSource;
property Destination : Pointer read FDestination write FDestination;
property Length : DWORD read FLength write FLength;
published
end;
procedure Register;
implementation
procedure Register;
begin
RegisterComponents('Samples', [TaPLib]);
end;
procedure TaPLib.Pack;
begin
if FDestination <> nil then
begin
FreeMem(FDestination);
FDestination := nil;
end;
if FWorkMem <> nil then
begin
FreeMem(FWorkMem);
FWorkMem := nil;
end;
GetMem(FDestination,_aP_max_packed_size(FLength));
if FDestination = nil then raise Exception.Create('Out of memory');
GetMem(FWorkMem,_aP_workmem_size(FLength));
if FWorkMem = nil then raise Exception.Create('Out of memory');
FLength := _aPsafe_pack(FSource^, FDestination^, FLength, FWorkMem^, CallBack, nil);
if FLength = aPLib_Error then raise Exception.Create('Compression error');
end;
procedure TaPLib.DePack;
var
DLength : DWORD;
begin
if FDestination <> nil then
begin
FreeMem(FDestination);
FDestination := nil;
end;
DLength := _aPsafe_get_orig_size(FSource^);
if DLength = aPLib_Error then raise Exception.Create('File is not packed with aPLib');
Getmem(FDestination, DLength);
if FDestination = nil then raise Exception.Create('Out of memory');
FLength := _aPsafe_depack(FSource^, FLength, FDestination^, DLength);
if FLength = aPLib_Error then raise Exception.Create('Decompression error');
end;
end.