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-- Ada Web Server --
-- --
-- Copyright (C) 2002-2014, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 3, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are --
-- granted additional permissions described in the GCC Runtime Library --
-- Exception, version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- 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. --
------------------------------------------------------------------------------
pragma Ada_2012;
package AWS.Resources.Streams is
use Ada;
type Stream_Type is abstract tagged limited private;
type Stream_Access is access all Stream_Type'Class;
function End_Of_File (Resource : Stream_Type) return Boolean is abstract;
procedure Read
(Resource : in out Stream_Type;
Buffer : out Stream_Element_Array;
Last : out Stream_Element_Offset) is abstract;
procedure Reset (Resource : in out Stream_Type) is abstract;
procedure Set_Index
(Resource : in out Stream_Type;
To : Stream_Element_Offset) is abstract;
-- Set the position in the stream, next Read will start at the position
-- whose index is To. If To is outside the content the index is set to
-- Last + 1 to ensure that next End_Of_File will return True.
procedure Close (Resource : in out Stream_Type) is abstract;
function Size (Resource : Stream_Type) return Stream_Element_Offset;
-- This default implementation returns Undefined_Length. If the derived
-- stream implementation knows about the size (in bytes) of the stream
-- this routine should be redefined.
function Name (Resource : Stream_Type) return String;
-- This default implementation returns the empty string. It is must be
-- overwritten by file based stream to provide the proper filename
-- associated with the stream.
procedure Create
(Resource : out File_Type;
Stream : Stream_Access) with Inline;
-- Create a resource file from user defined stream
private
type Stream_Type is abstract new Resources.File_Tagged with null record;
end AWS.Resources.Streams;
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