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157 lines
4.1 KiB
Ada
157 lines
4.1 KiB
Ada
----------------------------------------------------------------
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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: read.adb,v 1.8 2004/05/31 10:53:40 vagul Exp $
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-- Test/demo program for the generic read interface.
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with Ada.Numerics.Discrete_Random;
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with Ada.Streams;
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with Ada.Text_IO;
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with ZLib;
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procedure Read is
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use Ada.Streams;
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------------------------------------
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-- Test configuration parameters --
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------------------------------------
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File_Size : Stream_Element_Offset := 100_000;
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Continuous : constant Boolean := False;
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-- If this constant is True, the test would be repeated again and again,
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-- with increment File_Size for every iteration.
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Header : constant ZLib.Header_Type := ZLib.Default;
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-- Do not use Header other than Default in ZLib versions 1.1.4 and older.
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Init_Random : constant := 8;
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-- We are using the same random sequence, in case of we catch bug,
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-- so we would be able to reproduce it.
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-- End --
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Pack_Size : Stream_Element_Offset;
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Offset : Stream_Element_Offset;
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Filter : ZLib.Filter_Type;
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subtype Visible_Symbols
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is Stream_Element range 16#20# .. 16#7E#;
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package Random_Elements is new
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Ada.Numerics.Discrete_Random (Visible_Symbols);
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Gen : Random_Elements.Generator;
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Period : constant Stream_Element_Offset := 200;
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-- Period constant variable for random generator not to be very random.
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-- Bigger period, harder random.
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Read_Buffer : Stream_Element_Array (1 .. 2048);
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Read_First : Stream_Element_Offset;
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Read_Last : Stream_Element_Offset;
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procedure Reset;
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procedure Read
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(Item : out Stream_Element_Array;
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Last : out Stream_Element_Offset);
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-- this procedure is for generic instantiation of
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-- ZLib.Read
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-- reading data from the File_In.
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procedure Read is new ZLib.Read
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(Read,
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Read_Buffer,
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Rest_First => Read_First,
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Rest_Last => Read_Last);
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----------
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-- Read --
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----------
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procedure Read
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(Item : out Stream_Element_Array;
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Last : out Stream_Element_Offset) is
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begin
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Last := Stream_Element_Offset'Min
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(Item'Last,
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Item'First + File_Size - Offset);
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for J in Item'First .. Last loop
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if J < Item'First + Period then
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Item (J) := Random_Elements.Random (Gen);
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else
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Item (J) := Item (J - Period);
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end if;
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Offset := Offset + 1;
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end loop;
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end Read;
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-----------
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-- Reset --
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-----------
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procedure Reset is
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begin
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Random_Elements.Reset (Gen, Init_Random);
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Pack_Size := 0;
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Offset := 1;
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Read_First := Read_Buffer'Last + 1;
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Read_Last := Read_Buffer'Last;
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end Reset;
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begin
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Ada.Text_IO.Put_Line ("ZLib " & ZLib.Version);
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loop
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for Level in ZLib.Compression_Level'Range loop
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Ada.Text_IO.Put ("Level ="
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& ZLib.Compression_Level'Image (Level));
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-- Deflate using generic instantiation.
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ZLib.Deflate_Init
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(Filter,
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Level,
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Header => Header);
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Reset;
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Ada.Text_IO.Put
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(Stream_Element_Offset'Image (File_Size) & " ->");
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loop
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declare
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Buffer : Stream_Element_Array (1 .. 1024);
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Last : Stream_Element_Offset;
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begin
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Read (Filter, Buffer, Last);
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Pack_Size := Pack_Size + Last - Buffer'First + 1;
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exit when Last < Buffer'Last;
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end;
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end loop;
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Ada.Text_IO.Put_Line (Stream_Element_Offset'Image (Pack_Size));
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ZLib.Close (Filter);
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end loop;
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exit when not Continuous;
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File_Size := File_Size + 1;
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end loop;
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end Read;
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