---------------------------------------------------------------- -- ZLib for Ada thick binding. -- -- -- -- Copyright (C) 2002-2003 Dmitriy Anisimkov -- -- -- -- Open source license information is in the zlib.ads file. -- ---------------------------------------------------------------- -- $Id: zlib-streams.adb,v 1.1.1.2 2017/01/10 00:25:30 christos Exp $ with Ada.Unchecked_Deallocation; package body ZLib.Streams is ----------- -- Close -- ----------- procedure Close (Stream : in out Stream_Type) is procedure Free is new Ada.Unchecked_Deallocation (Stream_Element_Array, Buffer_Access); begin if Stream.Mode = Out_Stream or Stream.Mode = Duplex then -- We should flush the data written by the writer. Flush (Stream, Finish); Close (Stream.Writer); end if; if Stream.Mode = In_Stream or Stream.Mode = Duplex then Close (Stream.Reader); Free (Stream.Buffer); end if; end Close; ------------ -- Create -- ------------ 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) is subtype Buffer_Subtype is Stream_Element_Array (1 .. Read_Buffer_Size); procedure Init_Filter (Filter : in out Filter_Type; Compress : in Boolean); ----------------- -- Init_Filter -- ----------------- procedure Init_Filter (Filter : in out Filter_Type; Compress : in Boolean) is begin if Compress then Deflate_Init (Filter, Level, Strategy, Header => Header); else Inflate_Init (Filter, Header => Header); end if; end Init_Filter; begin Stream.Back := Back; Stream.Mode := Mode; if Mode = Out_Stream or Mode = Duplex then Init_Filter (Stream.Writer, Back_Compressed); Stream.Buffer_Size := Write_Buffer_Size; else Stream.Buffer_Size := 0; end if; if Mode = In_Stream or Mode = Duplex then Init_Filter (Stream.Reader, not Back_Compressed); Stream.Buffer := new Buffer_Subtype; Stream.Rest_First := Stream.Buffer'Last + 1; Stream.Rest_Last := Stream.Buffer'Last; end if; end Create; ----------- -- Flush -- ----------- procedure Flush (Stream : in out Stream_Type; Mode : in Flush_Mode := Sync_Flush) is Buffer : Stream_Element_Array (1 .. Stream.Buffer_Size); Last : Stream_Element_Offset; begin loop Flush (Stream.Writer, Buffer, Last, Mode); Ada.Streams.Write (Stream.Back.all, Buffer (1 .. Last)); exit when Last < Buffer'Last; end loop; end Flush; ------------- -- Is_Open -- ------------- function Is_Open (Stream : Stream_Type) return Boolean is begin return Is_Open (Stream.Reader) or else Is_Open (Stream.Writer); end Is_Open; ---------- -- Read -- ---------- procedure Read (Stream : in out Stream_Type; Item : out Stream_Element_Array; Last : out Stream_Element_Offset) is procedure Read (Item : out Stream_Element_Array; Last : out Stream_Element_Offset); ---------- -- Read -- ---------- procedure Read (Item : out Stream_Element_Array; Last : out Stream_Element_Offset) is begin Ada.Streams.Read (Stream.Back.all, Item, Last); end Read; procedure Read is new ZLib.Read (Read => Read, Buffer => Stream.Buffer.all, Rest_First => Stream.Rest_First, Rest_Last => Stream.Rest_Last); begin Read (Stream.Reader, Item, Last); end Read; ------------------- -- Read_Total_In -- ------------------- function Read_Total_In (Stream : in Stream_Type) return Count is begin return Total_In (Stream.Reader); end Read_Total_In; -------------------- -- Read_Total_Out -- -------------------- function Read_Total_Out (Stream : in Stream_Type) return Count is begin return Total_Out (Stream.Reader); end Read_Total_Out; ----------- -- Write -- ----------- procedure Write (Stream : in out Stream_Type; Item : in Stream_Element_Array) is procedure Write (Item : in Stream_Element_Array); ----------- -- Write -- ----------- procedure Write (Item : in Stream_Element_Array) is begin Ada.Streams.Write (Stream.Back.all, Item); end Write; procedure Write is new ZLib.Write (Write => Write, Buffer_Size => Stream.Buffer_Size); begin Write (Stream.Writer, Item, No_Flush); end Write; -------------------- -- Write_Total_In -- -------------------- function Write_Total_In (Stream : in Stream_Type) return Count is begin return Total_In (Stream.Writer); end Write_Total_In; --------------------- -- Write_Total_Out -- --------------------- function Write_Total_Out (Stream : in Stream_Type) return Count is begin return Total_Out (Stream.Writer); end Write_Total_Out; end ZLib.Streams;