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) 2001-2010, 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 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  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;