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