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+----------------------------------------------------------------
+-- 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 1.12 2004/05/31 10:53:40 vagul 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 untill necessary, becouse 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
+ -- becouse 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 becouse all data could be
+ -- processed in the write operation.
+
+ Back : Stream_Access;
+ Reader : Filter_Type;
+ Writer : Filter_Type;
+ end record;
+
+end ZLib.Streams;