[1049] | 1 | ----------------------------------------------------------------
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| 2 | -- ZLib for Ada thick binding. --
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| 3 | -- --
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| 4 | -- Copyright (C) 2002-2003 Dmitriy Anisimkov --
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| 5 | -- --
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| 6 | -- Open source license information is in the zlib.ads file. --
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| 7 | ----------------------------------------------------------------
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| 8 |
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| 9 | -- $Id: read.adb,v 1.8 2004/05/31 10:53:40 vagul Exp $
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| 10 |
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| 11 | -- Test/demo program for the generic read interface.
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| 12 |
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| 13 | with Ada.Numerics.Discrete_Random;
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| 14 | with Ada.Streams;
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| 15 | with Ada.Text_IO;
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| 16 |
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| 17 | with ZLib;
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| 18 |
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| 19 | procedure Read is
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| 20 |
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| 21 | use Ada.Streams;
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| 22 |
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| 23 | ------------------------------------
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| 24 | -- Test configuration parameters --
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| 25 | ------------------------------------
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| 26 |
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| 27 | File_Size : Stream_Element_Offset := 100_000;
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| 28 |
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| 29 | Continuous : constant Boolean := False;
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| 30 | -- If this constant is True, the test would be repeated again and again,
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| 31 | -- with increment File_Size for every iteration.
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| 32 |
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| 33 | Header : constant ZLib.Header_Type := ZLib.Default;
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| 34 | -- Do not use Header other than Default in ZLib versions 1.1.4 and older.
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| 35 |
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| 36 | Init_Random : constant := 8;
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| 37 | -- We are using the same random sequence, in case of we catch bug,
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| 38 | -- so we would be able to reproduce it.
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| 39 |
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| 40 | -- End --
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| 41 |
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| 42 | Pack_Size : Stream_Element_Offset;
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| 43 | Offset : Stream_Element_Offset;
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| 44 |
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| 45 | Filter : ZLib.Filter_Type;
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| 46 |
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| 47 | subtype Visible_Symbols
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| 48 | is Stream_Element range 16#20# .. 16#7E#;
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| 49 |
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| 50 | package Random_Elements is new
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| 51 | Ada.Numerics.Discrete_Random (Visible_Symbols);
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| 52 |
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| 53 | Gen : Random_Elements.Generator;
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| 54 | Period : constant Stream_Element_Offset := 200;
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| 55 | -- Period constant variable for random generator not to be very random.
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| 56 | -- Bigger period, harder random.
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| 57 |
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| 58 | Read_Buffer : Stream_Element_Array (1 .. 2048);
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| 59 | Read_First : Stream_Element_Offset;
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| 60 | Read_Last : Stream_Element_Offset;
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| 61 |
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| 62 | procedure Reset;
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| 63 |
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| 64 | procedure Read
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| 65 | (Item : out Stream_Element_Array;
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| 66 | Last : out Stream_Element_Offset);
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| 67 | -- this procedure is for generic instantiation of
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| 68 | -- ZLib.Read
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| 69 | -- reading data from the File_In.
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| 70 |
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| 71 | procedure Read is new ZLib.Read
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| 72 | (Read,
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| 73 | Read_Buffer,
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| 74 | Rest_First => Read_First,
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| 75 | Rest_Last => Read_Last);
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| 76 |
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| 77 | ----------
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| 78 | -- Read --
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| 79 | ----------
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| 80 |
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| 81 | procedure Read
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| 82 | (Item : out Stream_Element_Array;
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| 83 | Last : out Stream_Element_Offset) is
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| 84 | begin
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| 85 | Last := Stream_Element_Offset'Min
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| 86 | (Item'Last,
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| 87 | Item'First + File_Size - Offset);
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| 88 |
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| 89 | for J in Item'First .. Last loop
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| 90 | if J < Item'First + Period then
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| 91 | Item (J) := Random_Elements.Random (Gen);
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| 92 | else
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| 93 | Item (J) := Item (J - Period);
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| 94 | end if;
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| 95 |
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| 96 | Offset := Offset + 1;
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| 97 | end loop;
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| 98 | end Read;
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| 99 |
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| 100 | -----------
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| 101 | -- Reset --
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| 102 | -----------
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| 103 |
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| 104 | procedure Reset is
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| 105 | begin
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| 106 | Random_Elements.Reset (Gen, Init_Random);
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| 107 | Pack_Size := 0;
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| 108 | Offset := 1;
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| 109 | Read_First := Read_Buffer'Last + 1;
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| 110 | Read_Last := Read_Buffer'Last;
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| 111 | end Reset;
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| 112 |
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| 113 | begin
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| 114 | Ada.Text_IO.Put_Line ("ZLib " & ZLib.Version);
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| 115 |
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| 116 | loop
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| 117 | for Level in ZLib.Compression_Level'Range loop
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| 118 |
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| 119 | Ada.Text_IO.Put ("Level ="
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| 120 | & ZLib.Compression_Level'Image (Level));
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| 121 |
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| 122 | -- Deflate using generic instantiation.
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| 123 |
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| 124 | ZLib.Deflate_Init
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| 125 | (Filter,
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| 126 | Level,
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| 127 | Header => Header);
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| 128 |
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| 129 | Reset;
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| 130 |
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| 131 | Ada.Text_IO.Put
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| 132 | (Stream_Element_Offset'Image (File_Size) & " ->");
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| 133 |
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| 134 | loop
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| 135 | declare
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| 136 | Buffer : Stream_Element_Array (1 .. 1024);
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| 137 | Last : Stream_Element_Offset;
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| 138 | begin
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| 139 | Read (Filter, Buffer, Last);
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| 140 |
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| 141 | Pack_Size := Pack_Size + Last - Buffer'First + 1;
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| 142 |
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| 143 | exit when Last < Buffer'Last;
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| 144 | end;
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| 145 | end loop;
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| 146 |
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| 147 | Ada.Text_IO.Put_Line (Stream_Element_Offset'Image (Pack_Size));
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| 148 |
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| 149 | ZLib.Close (Filter);
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| 150 | end loop;
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| 151 |
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| 152 | exit when not Continuous;
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| 153 |
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| 154 | File_Size := File_Size + 1;
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| 155 | end loop;
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| 156 | end Read;
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