----------------------------------------------------------------
-- ZLib for Ada thick binding. --
-- --
-- Copyright (C) 2002-2003 Dmitriy Anisimkov --
-- --
-- Open source license information is in the zlib.ads file. --
----------------------------------------------------------------
-- $Id: test.adb,v 1.1.1.2 2023/03/21 16:41:53 christos Exp $
-- The program has a few aims.
-- 1. Test ZLib.Ada95 thick binding functionality.
-- 2. Show the example of use main functionality of the ZLib.Ada95 binding.
-- 3. Build this program automatically compile all ZLib.Ada95 packages under
-- GNAT Ada95 compiler.
with ZLib.Streams;
with Ada.Streams.Stream_IO;
with Ada.Numerics.Discrete_Random;
with Ada.Text_IO;
with Ada.Calendar;
procedure Test is
use Ada.Streams;
use Stream_IO;
------------------------------------
-- Test configuration parameters --
------------------------------------
File_Size : Count := 100_000;
Continuous : constant Boolean := False;
Header : constant ZLib.Header_Type := ZLib.Default;
-- ZLib.None;
-- ZLib.Auto;
-- ZLib.GZip;
-- Do not use Header other then Default in ZLib versions 1.1.4
-- and older.
Strategy : constant ZLib.Strategy_Type := ZLib.Default_Strategy;
Init_Random : constant := 10;
-- End --
In_File_Name : constant String := "testzlib.in";
-- Name of the input file
Z_File_Name : constant String := "testzlib.zlb";
-- Name of the compressed file.
Out_File_Name : constant String := "testzlib.out";
-- Name of the decompressed file.
File_In : File_Type;
File_Out : File_Type;
File_Back : File_Type;
File_Z : ZLib.Streams.Stream_Type;
Filter : ZLib.Filter_Type;
Time_Stamp : Ada.Calendar.Time;
procedure Generate_File;
-- Generate file of spetsified size with some random data.
-- The random data is repeatable, for the good compression.
procedure Compare_Streams
(Left, Right : in out Root_Stream_Type'Class);
-- The procedure compearing data in 2 streams.
-- It is for compare data before and after compression/decompression.
procedure Compare_Files (Left, Right : String);
-- Compare files. Based on the Compare_Streams.
procedure Copy_Streams
(Source, Target : in out Root_Stream_Type'Class;
Buffer_Size : in Stream_Element_Offset := 1024);
-- Copying data from one stream to another. It is for test stream
-- interface of the library.
procedure Data_In
(Item : out Stream_Element_Array;
Last : out Stream_Element_Offset);
-- this procedure is for generic instantiation of
-- ZLib.Generic_Translate.
-- reading data from the File_In.
procedure Data_Out (Item : in Stream_Element_Array);
-- this procedure is for generic instantiation of
-- ZLib.Generic_Translate.
-- writing data to the File_Out.
procedure Stamp;
-- Store the timestamp to the local variable.
procedure Print_Statistic (Msg : String; Data_Size : ZLib.Count);
-- Print the time statistic with the message.
procedure Translate is new ZLib.Generic_Translate
(Data_In => Data_In,
Data_Out => Data_Out);
-- This procedure is moving data from File_In to File_Out
-- with compression or decompression, depend on initialization of
-- Filter parameter.
-------------------
-- Compare_Files --
-------------------
procedure Compare_Files (Left, Right : String) is
Left_File, Right_File : File_Type;
begin
Open (Left_File, In_File, Left);
Open (Right_File, In_File, Right);
Compare_Streams (Stream (Left_File).all, Stream (Right_File).all);
Close (Left_File);
Close (Right_File);
end Compare_Files;
---------------------
-- Compare_Streams --
---------------------
procedure Compare_Streams
(Left, Right : in out Ada.Streams.Root_Stream_Type'Class)
is
Left_Buffer, Right_Buffer : Stream_Element_Array (0 .. 16#FFF#);
Left_Last, Right_Last : Stream_Element_Offset;
begin
loop
Read (Left, Left_Buffer, Left_Last);
Read (Right, Right_Buffer, Right_Last);
if Left_Last /= Right_Last then
Ada.Text_IO.Put_Line ("Compare error :"
& Stream_Element_Offset'Image (Left_Last)
& " /= "
& Stream_Element_Offset'Image (Right_Last));
raise Constraint_Error;
elsif Left_Buffer (0 .. Left_Last)
/= Right_Buffer (0 .. Right_Last)
then
Ada.Text_IO.Put_Line ("ERROR: IN and OUT files is not equal.");
raise Constraint_Error;
end if;
exit when Left_Last < Left_Buffer'Last;
end loop;
end Compare_Streams;
------------------
-- Copy_Streams --
------------------
procedure Copy_Streams
(Source, Target : in out Ada.Streams.Root_Stream_Type'Class;
Buffer_Size : in Stream_Element_Offset := 1024)
is
Buffer : Stream_Element_Array (1 .. Buffer_Size);
Last : Stream_Element_Offset;
begin
loop
Read (Source, Buffer, Last);
Write (Target, Buffer (1 .. Last));
exit when Last < Buffer'Last;
end loop;
end Copy_Streams;
-------------
-- Data_In --
-------------
procedure Data_In
(Item : out Stream_Element_Array;
Last : out Stream_Element_Offset) is
begin
Read (File_In, Item, Last);
end Data_In;
--------------
-- Data_Out --
--------------
procedure Data_Out (Item : in Stream_Element_Array) is
begin
Write (File_Out, Item);
end Data_Out;
-------------------
-- Generate_File --
-------------------
procedure Generate_File is
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;
Buffer : Stream_Element_Array := (1 .. 77 => 16#20#) & 10;
Buffer_Count : constant Count := File_Size / Buffer'Length;
-- Number of same buffers in the packet.
Density : constant Count := 30; -- from 0 to Buffer'Length - 2;
procedure Fill_Buffer (J, D : in Count);
-- Change the part of the buffer.
-----------------
-- Fill_Buffer --
-----------------
procedure Fill_Buffer (J, D : in Count) is
begin
for K in 0 .. D loop
Buffer
(Stream_Element_Offset ((J + K) mod (Buffer'Length - 1) + 1))
:= Random_Elements.Random (Gen);
end loop;
end Fill_Buffer;
begin
Random_Elements.Reset (Gen, Init_Random);
Create (File_In, Out_File, In_File_Name);
Fill_Buffer (1, Buffer'Length - 2);
for J in 1 .. Buffer_Count loop
Write (File_In, Buffer);
Fill_Buffer (J, Density);
end loop;
-- fill remain size.
Write
(File_In,
Buffer
(1 .. Stream_Element_Offset
(File_Size - Buffer'Length * Buffer_Count)));
Flush (File_In);
Close (File_In);
end Generate_File;
---------------------
-- Print_Statistic --
---------------------
procedure Print_Statistic (Msg : String; Data_Size : ZLib.Count) is
use Ada.Calendar;
use Ada.Text_IO;
package Count_IO is new Integer_IO (ZLib.Count);
Curr_Dur : Duration := Clock - Time_Stamp;
begin
Put (Msg);
Set_Col (20);
Ada.Text_IO.Put ("size =");
Count_IO.Put
(Data_Size,
Width => Stream_IO.Count'Image (File_Size)'Length);
Put_Line (" duration =" & Duration'Image (Curr_Dur));
end Print_Statistic;
-----------
-- Stamp --
-----------
procedure Stamp is
begin
Time_Stamp := Ada.Calendar.Clock;
end Stamp;
begin
Ada.Text_IO.Put_Line ("ZLib " & ZLib.Version);
loop
Generate_File;
for Level in ZLib.Compression_Level'Range loop
Ada.Text_IO.Put_Line ("Level ="
& ZLib.Compression_Level'Image (Level));
-- Test generic interface.
Open (File_In, In_File, In_File_Name);
Create (File_Out, Out_File, Z_File_Name);
Stamp;
-- Deflate using generic instantiation.
ZLib.Deflate_Init
(Filter => Filter,
Level => Level,
Strategy => Strategy,
Header => Header);
Translate (Filter);
Print_Statistic ("Generic compress", ZLib.Total_Out (Filter));
ZLib.Close (Filter);
Close (File_In);
Close (File_Out);
Open (File_In, In_File, Z_File_Name);
Create (File_Out, Out_File, Out_File_Name);
Stamp;
-- Inflate using generic instantiation.
ZLib.Inflate_Init (Filter, Header => Header);
Translate (Filter);
Print_Statistic ("Generic decompress", ZLib.Total_Out (Filter));
ZLib.Close (Filter);
Close (File_In);
Close (File_Out);
Compare_Files (In_File_Name, Out_File_Name);
-- Test stream interface.
-- Compress to the back stream.
Open (File_In, In_File, In_File_Name);
Create (File_Back, Out_File, Z_File_Name);
Stamp;
ZLib.Streams.Create
(Stream => File_Z,
Mode => ZLib.Streams.Out_Stream,
Back => ZLib.Streams.Stream_Access
(Stream (File_Back)),
Back_Compressed => True,
Level => Level,
Strategy => Strategy,
Header => Header);
Copy_Streams
(Source => Stream (File_In).all,
Target => File_Z);
-- Flushing internal buffers to the back stream.
ZLib.Streams.Flush (File_Z, ZLib.Finish);
Print_Statistic ("Write compress",
ZLib.Streams.Write_Total_Out (File_Z));
ZLib.Streams.Close (File_Z);
Close (File_In);
Close (File_Back);
-- Compare reading from original file and from
-- decompression stream.
Open (File_In, In_File, In_File_Name);
Open (File_Back, In_File, Z_File_Name);
ZLib.Streams.Create
(Stream => File_Z,
Mode => ZLib.Streams.In_Stream,
Back => ZLib.Streams.Stream_Access
(Stream (File_Back)),
Back_Compressed => True,
Header => Header);
Stamp;
Compare_Streams (Stream (File_In).all, File_Z);
Print_Statistic ("Read decompress",
ZLib.Streams.Read_Total_Out (File_Z));
ZLib.Streams.Close (File_Z);
Close (File_In);
Close (File_Back);
-- Compress by reading from compression stream.
Open (File_Back, In_File, In_File_Name);
Create (File_Out, Out_File, Z_File_Name);
ZLib.Streams.Create
(Stream => File_Z,
Mode => ZLib.Streams.In_Stream,
Back => ZLib.Streams.Stream_Access
(Stream (File_Back)),
Back_Compressed => False,
Level => Level,
Strategy => Strategy,
Header => Header);
Stamp;
Copy_Streams
(Source => File_Z,
Target => Stream (File_Out).all);
Print_Statistic ("Read compress",
ZLib.Streams.Read_Total_Out (File_Z));
ZLib.Streams.Close (File_Z);
Close (File_Out);
Close (File_Back);
-- Decompress to decompression stream.
Open (File_In, In_File, Z_File_Name);
Create (File_Back, Out_File, Out_File_Name);
ZLib.Streams.Create
(Stream => File_Z,
Mode => ZLib.Streams.Out_Stream,
Back => ZLib.Streams.Stream_Access
(Stream (File_Back)),
Back_Compressed => False,
Header => Header);
Stamp;
Copy_Streams
(Source => Stream (File_In).all,
Target => File_Z);
Print_Statistic ("Write decompress",
ZLib.Streams.Write_Total_Out (File_Z));
ZLib.Streams.Close (File_Z);
Close (File_In);
Close (File_Back);
Compare_Files (In_File_Name, Out_File_Name);
end loop;
Ada.Text_IO.Put_Line (Count'Image (File_Size) & " Ok.");
exit when not Continuous;
File_Size := File_Size + 1;
end loop;
end Test;