------------------------------------------------------------------------------ -- Ada Web Server -- -- -- -- Copyright (C) 2003-2013, 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 -- -- . -- -- -- -- 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 body AWS.Resources.Streams.ZLib is ----------- -- Close -- ----------- overriding procedure Close (Resource : in out Stream_Type) is begin if Resource.Source /= null then Close (Resource.Source); ZL.Close (Resource.Filter, Ignore_Error => True); end if; end Close; -------------------- -- Deflate_Create -- -------------------- function Deflate_Create (Source : Streams.Stream_Access; Level : Compression_Level := ZL.Default_Compression; Strategy : Strategy_Type := ZL.Default_Strategy; Method : Compression_Method := ZL.Deflated; Window_Bits : Window_Bits_Type := ZL.Default_Window_Bits; Memory_Level : Memory_Level_Type := ZL.Default_Memory_Level; Header : Header_Type := ZL.Default) return Stream_Access is Result : constant 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 : Streams.Stream_Access; Level : Compression_Level := ZL.Default_Compression; Strategy : Strategy_Type := ZL.Default_Strategy; Method : Compression_Method := ZL.Deflated; Window_Bits : Window_Bits_Type := ZL.Default_Window_Bits; Memory_Level : Memory_Level_Type := ZL.Default_Memory_Level; Header : Header_Type := ZL.Default) is begin Create (Resource.Source, Source); Resource.End_Of_File := False; Resource.Rest_First := Resource.Buffer'Last + 1; Resource.Rest_Last := Resource.Buffer'Last; ZL.Deflate_Init (Resource.Filter, Level, Strategy, Method, Window_Bits, Memory_Level, Header); end Deflate_Initialize; ----------------- -- End_Of_File -- ----------------- overriding function End_Of_File (Resource : 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_Create -- -------------------- function Inflate_Create (Source : Streams.Stream_Access; Window_Bits : Window_Bits_Type := ZL.Default_Window_Bits; Header : Header_Type := ZL.Default) return Stream_Access is Result : constant Streams.Stream_Access := new Stream_Type; begin Inflate_Initialize (Stream_Type (Result.all), Source, Window_Bits, Header); return Result; end Inflate_Create; ------------------------ -- Inflate_Initialize -- ------------------------ procedure Inflate_Initialize (Resource : in out Stream_Type; Source : Streams.Stream_Access; Window_Bits : Window_Bits_Type := ZL.Default_Window_Bits; Header : Header_Type := ZL.Default) is begin Create (Resource.Source, Source); Resource.End_Of_File := False; Resource.Rest_First := Resource.Buffer'Last + 1; Resource.Rest_Last := Resource.Buffer'Last; ZL.Inflate_Init (Resource.Filter, Window_Bits, Header); end Inflate_Initialize; ---------- -- Read -- ---------- overriding 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) with Inline; -- 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; ----------- -- Reset -- ----------- overriding procedure Reset (Resource : in out Stream_Type) is begin Reset (Resource.Source); end Reset; --------------- -- Set_Index -- --------------- overriding procedure Set_Index (Resource : in out Stream_Type; To : Stream_Element_Offset) is begin Set_Index (Resource.Source, To); end Set_Index; end AWS.Resources.Streams.ZLib;