File : g-crc32.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT LIBRARY COMPONENTS --
4 -- --
5 -- G N A T . C R C 3 2 --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 2001-2010, AdaCore --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
17 -- --
18 -- --
19 -- --
20 -- --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 with Ada.Unchecked_Conversion;
33
34 package body GNAT.CRC32 is
35
36 ------------
37 -- Update --
38 ------------
39
40 procedure Update (C : in out CRC32; Value : String) is
41 begin
42 for K in Value'Range loop
43 Update (C, Value (K));
44 end loop;
45 end Update;
46
47 procedure Update (C : in out CRC32; Value : Ada.Streams.Stream_Element) is
48 function To_Char is new Ada.Unchecked_Conversion
49 (Ada.Streams.Stream_Element, Character);
50 V : constant Character := To_Char (Value);
51 begin
52 Update (C, V);
53 end Update;
54
55 procedure Update
56 (C : in out CRC32;
57 Value : Ada.Streams.Stream_Element_Array)
58 is
59 begin
60 for K in Value'Range loop
61 Update (C, Value (K));
62 end loop;
63 end Update;
64
65 -----------------
66 -- Wide_Update --
67 -----------------
68
69 procedure Wide_Update (C : in out CRC32; Value : Wide_Character) is
70 subtype S2 is String (1 .. 2);
71 function To_S2 is new Ada.Unchecked_Conversion (Wide_Character, S2);
72 VS : constant S2 := To_S2 (Value);
73 begin
74 Update (C, VS (1));
75 Update (C, VS (2));
76 end Wide_Update;
77
78 procedure Wide_Update (C : in out CRC32; Value : Wide_String) is
79 begin
80 for K in Value'Range loop
81 Wide_Update (C, Value (K));
82 end loop;
83 end Wide_Update;
84
85 end GNAT.CRC32;