File : src/aws-resources-streams-zlib.adb
------------------------------------------------------------------------------
-- Ada Web Server --
-- --
-- Copyright (C) 2003 --
-- ACT-Europe --
-- --
-- Authors: Dmitriy Anisimkov - Pascal Obry --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under the terms of the GNU General Public License as published by --
-- the Free Software Foundation; either version 2 of the License, or (at --
-- your option) any later version. --
-- --
-- This library 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. See the GNU --
-- General Public License for more details. --
-- --
-- You should have received a copy of the GNU General Public License --
-- along with this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
------------------------------------------------------------------------------
-- $RCSfile: aws-resources-streams-zlib.adb,v $
-- $Revision: 1.6 $
-- $Date: 2003/10/06 11:02:55 $
-- $Author: anisimko $
package body AWS.Resources.Streams.ZLib is
-----------
-- Close --
-----------
procedure Close (Resource : in out Stream_Type) is
begin
ZL.Close (Resource.Filter);
Close (Resource.Source);
end Close;
--------------------
-- Deflate_Create --
--------------------
function Deflate_Create
(Source : in Streams.Stream_Access;
Level : in Compression_Level := ZL.Default_Compression;
Strategy : in Strategy_Type := ZL.Default_Strategy;
Method : in Compression_Method := ZL.Deflated;
Window_Bits : in Window_Bits_Type := ZL.Default_Window_Bits;
Memory_Level : in Memory_Level_Type := ZL.Default_Memory_Level;
Header : in Header_Type := ZL.Default)
return Stream_Access
is
Result : Streams.Stream_Access := new Stream_Type;
begin
Deflate_Initialize
(Stream_Type (Result.all), Source, Level, Strategy, Method,
Window_Bits, Memory_Level, Header);
return Result;
end Deflate_Create;
------------------------
-- Deflate_Initialize --
------------------------
procedure Deflate_Initialize
(Resource : in out Stream_Type;
Source : in Streams.Stream_Access;
Level : in Compression_Level := ZL.Default_Compression;
Strategy : in Strategy_Type := ZL.Default_Strategy;
Method : in Compression_Method := ZL.Deflated;
Window_Bits : in Window_Bits_Type := ZL.Default_Window_Bits;
Memory_Level : in Memory_Level_Type := ZL.Default_Memory_Level;
Header : in Header_Type := ZL.Default) is
begin
Create (Resource.Source, Source);
Resource.End_Of_File := False;
Resource.Rest_First := Resource.Buffer'Last + 1;
ZL.Deflate_Init
(Resource.Filter, Level, Strategy, Method,
Window_Bits, Memory_Level, Header);
end Deflate_Initialize;
-----------------
-- End_Of_File --
-----------------
function End_Of_File (Resource : in Stream_Type) return Boolean is
begin
-- We could not use return End_Of_File (Resource.Source);
-- because end of source file would be reached earlier then
-- end of file of the encoded stream.
return Resource.End_Of_File;
end End_Of_File;
------------------------
-- Inflate_Initialize --
------------------------
procedure Inflate_Initialize
(Resource : in out Stream_Type;
Source : in Streams.Stream_Access;
Window_Bits : in Window_Bits_Type := ZL.Default_Window_Bits;
Header : in Header_Type := ZL.Default) is
begin
Create (Resource.Source, Source);
Resource.End_Of_File := False;
Resource.Rest_First := Resource.Buffer'Last + 1;
ZL.Inflate_Init (Resource.Filter, Window_Bits, Header);
end Inflate_Initialize;
----------
-- Read --
----------
procedure Read
(Resource : in out Stream_Type;
Buffer : out Stream_Element_Array;
Last : out Stream_Element_Offset)
is
procedure Get
(Buffer : out Stream_Element_Array;
Last : out Stream_Element_Offset);
pragma Inline (Get);
-- Generic parameter for read source data.
---------
-- Get --
---------
procedure Get
(Buffer : out Stream_Element_Array;
Last : out Stream_Element_Offset) is
begin
Read (Resource.Source, Buffer, Last);
end Get;
procedure Read_Encoded is new ZL.Read
(Read => Get,
Buffer => Resource.Buffer,
Rest_First => Resource.Rest_First,
Rest_Last => Resource.Rest_Last);
begin
Read_Encoded (Resource.Filter, Buffer, Last);
Resource.End_Of_File := Last < Buffer'Last;
end Read;
end AWS.Resources.Streams.ZLib;