File : src/aws-resources-streams-zlib.ads
------------------------------------------------------------------------------
-- 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.ads,v $
-- $Revision: 1.8 $
-- $Date: 2003/12/04 12:30:16 $
-- $Author: anisimko $
with ZLib;
package AWS.Resources.Streams.ZLib is
use Ada;
type Stream_Type is new Streams.Stream_Type with private;
package ZL renames Standard.ZLib;
subtype Window_Bits_Type is ZL.Window_Bits_Type;
subtype Header_Type is ZL.Header_Type;
subtype Compression_Level is ZL.Compression_Level;
subtype Strategy_Type is ZL.Strategy_Type;
subtype Compression_Method is ZL.Compression_Method;
subtype Memory_Level_Type is ZL.Memory_Level_Type;
Default_Compression : constant Compression_Level := ZL.Default_Compression;
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);
-- Initialize the compression of the user defined stream
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);
-- Initialize the decompression of the user defined stream
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;
-- Creates dynamically allocated Stream_Type and initialize the compression
-- of the user defined stream.
function Inflate_Create
(Source : in Streams.Stream_Access;
Window_Bits : in Window_Bits_Type := ZL.Default_Window_Bits;
Header : in Header_Type := ZL.Default)
return Stream_Access;
-- Creates dynamically allocated Stream_Type and initialize the
-- decompression of the user defined stream.
procedure Read
(Resource : in out Stream_Type;
Buffer : out Stream_Element_Array;
Last : out Stream_Element_Offset);
-- Get the source data from the Source stream, encode it, and return
-- encoded data in the Buffer.
procedure Close (Resource : in out Stream_Type);
procedure Reset (Resource : in out Stream_Type);
function End_Of_File (Resource : in Stream_Type) return Boolean;
-- Returns true if there is no more data to read
private
type Stream_Type is new Streams.Stream_Type with record
Source : Resources.File_Type;
End_Of_File : Boolean;
Filter : ZL.Filter_Type;
Buffer : Stream_Element_Array (1 .. 4096);
Rest_First : Stream_Element_Offset;
Rest_Last : Stream_Element_Offset;
end record;
end AWS.Resources.Streams.ZLib;