------------------------------------------------------------------------------
-- --
--- GNU ADA RUNTIME LIBRARY (GNARL) COMPONENTS --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . B I T _ O P S --
-- --
-- S p e c --
-- --
--- --
--- Copyright (C) 1992-1999, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- Operations on packed bit strings
+pragma Compiler_Unit;
+
with System;
package System.Bit_Ops is
-- Note: in all the following routines, the System.Address parameters
-- represent the address of the first byte of an array used to represent
-- a packed array (of type System.Unsigned_Types.Packed_Bytes{1,2,4})
- -- The length in bits is passed as a separate parameter.
+ -- The length in bits is passed as a separate parameter. Note that all
+ -- addresses must be of byte aligned arrays.
procedure Bit_And
(Left : System.Address;
Llen : Natural;
- Right : Address;
+ Right : System.Address;
Rlen : Natural;
Result : System.Address);
-- Bitwise "and" of given bit string with result being placed in Result.
- -- The or operation is allowed to destroy unused bits in the last byte,
+ -- The and operation is allowed to destroy unused bits in the last byte,
-- i.e. to leave them set in an undefined manner. Note that Left, Right
-- and Result always have the same length in bits (Len).
(Left : System.Address;
Llen : Natural;
Right : System.Address;
- Rlen : Natural)
- return Boolean;
+ Rlen : Natural) return Boolean;
-- Left and Right are the addresses of two bit packed arrays with Llen
-- and Rlen being the respective length in bits. The routine compares the
-- two bit strings for equality, being careful not to include the unused
procedure Bit_Or
(Left : System.Address;
Llen : Natural;
- Right : Address;
+ Right : System.Address;
Rlen : Natural;
Result : System.Address);
-- Bitwise "or" of given bit string with result being placed in Result.
procedure Bit_Xor
(Left : System.Address;
Llen : Natural;
- Right : Address;
+ Right : System.Address;
Rlen : Natural;
Result : System.Address);
-- Bitwise "xor" of given bit string with result being placed in Result.
- -- The or operation is allowed to destroy unused bits in the last byte,
+ -- The xor operation is allowed to destroy unused bits in the last byte,
-- i.e. to leave them set in an undefined manner. Note that Left, Right
-- and Result always have the same length in bits (Len).
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