157 lines
4.1 KiB
Ada
Executable File
157 lines
4.1 KiB
Ada
Executable File
----------------------------------------------------------------
|
|
-- ZLib for Ada thick binding. --
|
|
-- --
|
|
-- Copyright (C) 2002-2003 Dmitriy Anisimkov --
|
|
-- --
|
|
-- Open source license information is in the zlib.ads file. --
|
|
----------------------------------------------------------------
|
|
|
|
-- $Id: read.adb,v 1.8 2004/05/31 10:53:40 vagul Exp $
|
|
|
|
-- Test/demo program for the generic read interface.
|
|
|
|
with Ada.Numerics.Discrete_Random;
|
|
with Ada.Streams;
|
|
with Ada.Text_IO;
|
|
|
|
with ZLib;
|
|
|
|
procedure Read is
|
|
|
|
use Ada.Streams;
|
|
|
|
------------------------------------
|
|
-- Test configuration parameters --
|
|
------------------------------------
|
|
|
|
File_Size : Stream_Element_Offset := 100_000;
|
|
|
|
Continuous : constant Boolean := False;
|
|
-- If this constant is True, the test would be repeated again and again,
|
|
-- with increment File_Size for every iteration.
|
|
|
|
Header : constant ZLib.Header_Type := ZLib.Default;
|
|
-- Do not use Header other than Default in ZLib versions 1.1.4 and older.
|
|
|
|
Init_Random : constant := 8;
|
|
-- We are using the same random sequence, in case of we catch bug,
|
|
-- so we would be able to reproduce it.
|
|
|
|
-- End --
|
|
|
|
Pack_Size : Stream_Element_Offset;
|
|
Offset : Stream_Element_Offset;
|
|
|
|
Filter : ZLib.Filter_Type;
|
|
|
|
subtype Visible_Symbols
|
|
is Stream_Element range 16#20# .. 16#7E#;
|
|
|
|
package Random_Elements is new
|
|
Ada.Numerics.Discrete_Random (Visible_Symbols);
|
|
|
|
Gen : Random_Elements.Generator;
|
|
Period : constant Stream_Element_Offset := 200;
|
|
-- Period constant variable for random generator not to be very random.
|
|
-- Bigger period, harder random.
|
|
|
|
Read_Buffer : Stream_Element_Array (1 .. 2048);
|
|
Read_First : Stream_Element_Offset;
|
|
Read_Last : Stream_Element_Offset;
|
|
|
|
procedure Reset;
|
|
|
|
procedure Read
|
|
(Item : out Stream_Element_Array;
|
|
Last : out Stream_Element_Offset);
|
|
-- this procedure is for generic instantiation of
|
|
-- ZLib.Read
|
|
-- reading data from the File_In.
|
|
|
|
procedure Read is new ZLib.Read
|
|
(Read,
|
|
Read_Buffer,
|
|
Rest_First => Read_First,
|
|
Rest_Last => Read_Last);
|
|
|
|
----------
|
|
-- Read --
|
|
----------
|
|
|
|
procedure Read
|
|
(Item : out Stream_Element_Array;
|
|
Last : out Stream_Element_Offset) is
|
|
begin
|
|
Last := Stream_Element_Offset'Min
|
|
(Item'Last,
|
|
Item'First + File_Size - Offset);
|
|
|
|
for J in Item'First .. Last loop
|
|
if J < Item'First + Period then
|
|
Item (J) := Random_Elements.Random (Gen);
|
|
else
|
|
Item (J) := Item (J - Period);
|
|
end if;
|
|
|
|
Offset := Offset + 1;
|
|
end loop;
|
|
end Read;
|
|
|
|
-----------
|
|
-- Reset --
|
|
-----------
|
|
|
|
procedure Reset is
|
|
begin
|
|
Random_Elements.Reset (Gen, Init_Random);
|
|
Pack_Size := 0;
|
|
Offset := 1;
|
|
Read_First := Read_Buffer'Last + 1;
|
|
Read_Last := Read_Buffer'Last;
|
|
end Reset;
|
|
|
|
begin
|
|
Ada.Text_IO.Put_Line ("ZLib " & ZLib.Version);
|
|
|
|
loop
|
|
for Level in ZLib.Compression_Level'Range loop
|
|
|
|
Ada.Text_IO.Put ("Level ="
|
|
& ZLib.Compression_Level'Image (Level));
|
|
|
|
-- Deflate using generic instantiation.
|
|
|
|
ZLib.Deflate_Init
|
|
(Filter,
|
|
Level,
|
|
Header => Header);
|
|
|
|
Reset;
|
|
|
|
Ada.Text_IO.Put
|
|
(Stream_Element_Offset'Image (File_Size) & " ->");
|
|
|
|
loop
|
|
declare
|
|
Buffer : Stream_Element_Array (1 .. 1024);
|
|
Last : Stream_Element_Offset;
|
|
begin
|
|
Read (Filter, Buffer, Last);
|
|
|
|
Pack_Size := Pack_Size + Last - Buffer'First + 1;
|
|
|
|
exit when Last < Buffer'Last;
|
|
end;
|
|
end loop;
|
|
|
|
Ada.Text_IO.Put_Line (Stream_Element_Offset'Image (Pack_Size));
|
|
|
|
ZLib.Close (Filter);
|
|
end loop;
|
|
|
|
exit when not Continuous;
|
|
|
|
File_Size := File_Size + 1;
|
|
end loop;
|
|
end Read;
|