gcc/ada/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) 2001-2007, 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with Ada.Unchecked_Conversion;
  35
  36 package body GNAT.CRC32 is
  37
  38    ------------
  39    -- Update --
  40    ------------
  41
  42    procedure Update (C : in out CRC32; Value : String) is
  43    begin
  44       for K in Value'Range loop
  45          Update (C, Value (K));
  46       end loop;
  47    end Update;
  48
  49    procedure Update (C : in out CRC32; Value : Ada.Streams.Stream_Element) is
  50       function To_Char is new Ada.Unchecked_Conversion
  51         (Ada.Streams.Stream_Element, Character);
  52       V : constant Character := To_Char (Value);
  53    begin
  54       Update (C, V);
  55    end Update;
  56
  57    procedure Update
  58      (C     : in out CRC32;
  59       Value : Ada.Streams.Stream_Element_Array)
  60    is
  61    begin
  62       for K in Value'Range loop
  63          Update (C, Value (K));
  64       end loop;
  65    end Update;
  66
  67    -----------------
  68    -- Wide_Update --
  69    -----------------
  70
  71    procedure Wide_Update (C : in out CRC32; Value : Wide_Character) is
  72       subtype S2 is String (1 .. 2);
  73       function To_S2 is new Ada.Unchecked_Conversion (Wide_Character, S2);
  74       VS : constant S2 := To_S2 (Value);
  75    begin
  76       Update (C, VS (1));
  77       Update (C, VS (2));
  78    end Wide_Update;
  79
  80    procedure Wide_Update (C : in out CRC32; Value : Wide_String) is
  81    begin
  82       for K in Value'Range loop
  83          Wide_Update (C, Value (K));
  84       end loop;
  85    end Wide_Update;
  86
  87 end GNAT.CRC32;