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+----------------------------------------------------------------
+-- 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 1.17 2003/08/12 12:13:30 vagul 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;
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