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) 2001-2002 Ada Core Technologies, Inc.           --
  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,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, 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 is maintained by Ada Core Technologies Inc (http://www.gnat.com).   --
  30 --                                                                          --
  31 ------------------------------------------------------------------------------
  32
  33 with Unchecked_Conversion;
  34
  35 package body GNAT.CRC32 is
  36
  37    ------------
  38    -- Update --
  39    ------------
  40
  41    procedure Update (C : in out CRC32; Value : String) is
  42    begin
  43       for K in Value'Range loop
  44          Update (C, Value (K));
  45       end loop;
  46    end Update;
  47
  48    procedure Update (C : in out CRC32; Value : Ada.Streams.Stream_Element) is
  49       function To_Char is new Unchecked_Conversion
  50         (Ada.Streams.Stream_Element, Character);
  51
  52       V : constant Character := To_Char (Value);
  53
  54    begin
  55       Update (C, V);
  56    end Update;
  57
  58    procedure Update
  59      (C     : in out CRC32;
  60       Value : Ada.Streams.Stream_Element_Array)
  61    is
  62    begin
  63       for K in Value'Range loop
  64          Update (C, Value (K));
  65       end loop;
  66    end Update;
  67
  68    -----------------
  69    -- Wide_Update --
  70    -----------------
  71
  72    procedure Wide_Update (C : in out CRC32; Value : Wide_Character) is
  73       subtype S2 is String (1 .. 2);
  74       function To_S2 is new Unchecked_Conversion (Wide_Character, S2);
  75
  76       VS : constant S2 := To_S2 (Value);
  77
  78    begin
  79       Update (C, VS (1));
  80       Update (C, VS (2));
  81    end Wide_Update;
  82
  83    procedure Wide_Update (C : in out CRC32; Value : Wide_String) is
  84    begin
  85       for K in Value'Range loop
  86          Wide_Update (C, Value (K));
  87       end loop;
  88    end Wide_Update;
  89
  90 end GNAT.CRC32;