115 lines
4.2 KiB
Ada
115 lines
4.2 KiB
Ada
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----------------------------------------------------------------
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-- ZLib for Ada thick binding. --
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-- --
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-- Copyright (C) 2002-2003 Dmitriy Anisimkov --
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-- --
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-- Open source license information is in the zlib.ads file. --
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----------------------------------------------------------------
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-- $Id: zlib-streams.ads,v 1.12 2004/05/31 10:53:40 vagul Exp $
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package ZLib.Streams is
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type Stream_Mode is (In_Stream, Out_Stream, Duplex);
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type Stream_Access is access all Ada.Streams.Root_Stream_Type'Class;
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type Stream_Type is
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new Ada.Streams.Root_Stream_Type with private;
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procedure Read
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(Stream : in out Stream_Type;
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Item : out Ada.Streams.Stream_Element_Array;
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Last : out Ada.Streams.Stream_Element_Offset);
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procedure Write
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(Stream : in out Stream_Type;
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Item : in Ada.Streams.Stream_Element_Array);
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procedure Flush
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(Stream : in out Stream_Type;
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Mode : in Flush_Mode := Sync_Flush);
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-- Flush the written data to the back stream,
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-- all data placed to the compressor is flushing to the Back stream.
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-- Should not be used untill necessary, becouse it is decreasing
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-- compression.
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function Read_Total_In (Stream : in Stream_Type) return Count;
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pragma Inline (Read_Total_In);
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-- Return total number of bytes read from back stream so far.
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function Read_Total_Out (Stream : in Stream_Type) return Count;
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pragma Inline (Read_Total_Out);
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-- Return total number of bytes read so far.
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function Write_Total_In (Stream : in Stream_Type) return Count;
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pragma Inline (Write_Total_In);
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-- Return total number of bytes written so far.
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function Write_Total_Out (Stream : in Stream_Type) return Count;
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pragma Inline (Write_Total_Out);
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-- Return total number of bytes written to the back stream.
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procedure Create
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(Stream : out Stream_Type;
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Mode : in Stream_Mode;
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Back : in Stream_Access;
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Back_Compressed : in Boolean;
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Level : in Compression_Level := Default_Compression;
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Strategy : in Strategy_Type := Default_Strategy;
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Header : in Header_Type := Default;
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Read_Buffer_Size : in Ada.Streams.Stream_Element_Offset
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:= Default_Buffer_Size;
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Write_Buffer_Size : in Ada.Streams.Stream_Element_Offset
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:= Default_Buffer_Size);
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-- Create the Comression/Decompression stream.
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-- If mode is In_Stream then Write operation is disabled.
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-- If mode is Out_Stream then Read operation is disabled.
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-- If Back_Compressed is true then
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-- Data written to the Stream is compressing to the Back stream
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-- and data read from the Stream is decompressed data from the Back stream.
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-- If Back_Compressed is false then
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-- Data written to the Stream is decompressing to the Back stream
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-- and data read from the Stream is compressed data from the Back stream.
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-- !!! When the Need_Header is False ZLib-Ada is using undocumented
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-- ZLib 1.1.4 functionality to do not create/wait for ZLib headers.
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function Is_Open (Stream : Stream_Type) return Boolean;
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procedure Close (Stream : in out Stream_Type);
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private
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use Ada.Streams;
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type Buffer_Access is access all Stream_Element_Array;
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type Stream_Type
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is new Root_Stream_Type with
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record
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Mode : Stream_Mode;
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Buffer : Buffer_Access;
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Rest_First : Stream_Element_Offset;
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Rest_Last : Stream_Element_Offset;
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-- Buffer for Read operation.
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-- We need to have this buffer in the record
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-- becouse not all read data from back stream
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-- could be processed during the read operation.
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Buffer_Size : Stream_Element_Offset;
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-- Buffer size for write operation.
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-- We do not need to have this buffer
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-- in the record becouse all data could be
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-- processed in the write operation.
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Back : Stream_Access;
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Reader : Filter_Type;
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Writer : Filter_Type;
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end record;
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end ZLib.Streams;
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