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 --                            $Revision$
  10 --                                                                          --
  11 --              Copyright (C) 2001 Ada Core Technologies, Inc.              --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com).   --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 with Unchecked_Conversion;
  36
  37 package body GNAT.CRC32 is
  38
  39    ------------
  40    -- Update --
  41    ------------
  42
  43    procedure Update (C : in out CRC32; Value : String) is
  44    begin
  45       for K in Value'Range loop
  46          Update (C, Value (K));
  47       end loop;
  48    end Update;
  49
  50    procedure Update (C : in out CRC32; Value : Ada.Streams.Stream_Element) is
  51       function To_Char is new Unchecked_Conversion
  52         (Ada.Streams.Stream_Element, Character);
  53
  54       V : constant Character := To_Char (Value);
  55
  56    begin
  57       Update (C, V);
  58    end Update;
  59
  60    procedure Update
  61      (C     : in out CRC32;
  62       Value : Ada.Streams.Stream_Element_Array)
  63    is
  64    begin
  65       for K in Value'Range loop
  66          Update (C, Value (K));
  67       end loop;
  68    end Update;
  69
  70    -----------------
  71    -- Wide_Update --
  72    -----------------
  73
  74    procedure Wide_Update (C : in out CRC32; Value : Wide_Character) is
  75       subtype S2 is String (1 .. 2);
  76       function To_S2 is new Unchecked_Conversion (Wide_Character, S2);
  77
  78       VS : S2 := To_S2 (Value);
  79
  80    begin
  81       Update (C, VS (1));
  82       Update (C, VS (2));
  83    end Wide_Update;
  84
  85    procedure Wide_Update (C : in out CRC32; Value : Wide_String) is
  86    begin
  87       for K in Value'Range loop
  88          Wide_Update (C, Value (K));
  89       end loop;
  90    end Wide_Update;
  91
  92 end GNAT.CRC32;