---------------------------------------------------------------- -- ZLib for Ada thick binding. -- -- -- -- Copyright (C) 2002-2003 Dmitriy Anisimkov -- -- -- -- Open source license information is in the zlib.ads file. -- ---------------------------------------------------------------- -- $Id: zlib-streams.ads,v 1.1.1.2 2017/01/10 00:25:30 christos Exp $ package ZLib.Streams is type Stream_Mode is (In_Stream, Out_Stream, Duplex); type Stream_Access is access all Ada.Streams.Root_Stream_Type'Class; type Stream_Type is new Ada.Streams.Root_Stream_Type with private; procedure Read (Stream : in out Stream_Type; Item : out Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset); procedure Write (Stream : in out Stream_Type; Item : in Ada.Streams.Stream_Element_Array); procedure Flush (Stream : in out Stream_Type; Mode : in Flush_Mode := Sync_Flush); -- Flush the written data to the back stream, -- all data placed to the compressor is flushing to the Back stream. -- Should not be used until necessary, because it is decreasing -- compression. function Read_Total_In (Stream : in Stream_Type) return Count; pragma Inline (Read_Total_In); -- Return total number of bytes read from back stream so far. function Read_Total_Out (Stream : in Stream_Type) return Count; pragma Inline (Read_Total_Out); -- Return total number of bytes read so far. function Write_Total_In (Stream : in Stream_Type) return Count; pragma Inline (Write_Total_In); -- Return total number of bytes written so far. function Write_Total_Out (Stream : in Stream_Type) return Count; pragma Inline (Write_Total_Out); -- Return total number of bytes written to the back stream. procedure Create (Stream : out Stream_Type; Mode : in Stream_Mode; Back : in Stream_Access; Back_Compressed : in Boolean; Level : in Compression_Level := Default_Compression; Strategy : in Strategy_Type := Default_Strategy; Header : in Header_Type := Default; Read_Buffer_Size : in Ada.Streams.Stream_Element_Offset := Default_Buffer_Size; Write_Buffer_Size : in Ada.Streams.Stream_Element_Offset := Default_Buffer_Size); -- Create the Comression/Decompression stream. -- If mode is In_Stream then Write operation is disabled. -- If mode is Out_Stream then Read operation is disabled. -- If Back_Compressed is true then -- Data written to the Stream is compressing to the Back stream -- and data read from the Stream is decompressed data from the Back stream. -- If Back_Compressed is false then -- Data written to the Stream is decompressing to the Back stream -- and data read from the Stream is compressed data from the Back stream. -- !!! When the Need_Header is False ZLib-Ada is using undocumented -- ZLib 1.1.4 functionality to do not create/wait for ZLib headers. function Is_Open (Stream : Stream_Type) return Boolean; procedure Close (Stream : in out Stream_Type); private use Ada.Streams; type Buffer_Access is access all Stream_Element_Array; type Stream_Type is new Root_Stream_Type with record Mode : Stream_Mode; Buffer : Buffer_Access; Rest_First : Stream_Element_Offset; Rest_Last : Stream_Element_Offset; -- Buffer for Read operation. -- We need to have this buffer in the record -- because not all read data from back stream -- could be processed during the read operation. Buffer_Size : Stream_Element_Offset; -- Buffer size for write operation. -- We do not need to have this buffer -- in the record because all data could be -- processed in the write operation. Back : Stream_Access; Reader : Filter_Type; Writer : Filter_Type; end record; end ZLib.Streams;