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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
--- --
--- S Y S T E M . B I T _ O P S --
--- --
--- S p e c --
--- --
--- Copyright (C) 1992-2009, 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 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. --
--- --
--- 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. --
--- --
--- 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
-
-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. Note that all
- -- addresses must be of byte aligned arrays.
-
- procedure Bit_And
- (Left : System.Address;
- Llen : Natural;
- Right : System.Address;
- Rlen : Natural;
- Result : System.Address);
- -- Bitwise "and" of given bit string with result being placed in Result.
- -- 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).
-
- function Bit_Eq
- (Left : System.Address;
- Llen : Natural;
- Right : System.Address;
- 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
- -- bits in the final byte. Note that the result is always False if Rlen
- -- is not equal to Llen.
-
- procedure Bit_Not
- (Opnd : System.Address;
- Len : Natural;
- Result : System.Address);
- -- Bitwise "not" of given bit string with result being placed in Result.
- -- The not operation is allowed to destroy unused bits in the last byte,
- -- i.e. to leave them set in an undefined manner. Note that Result and
- -- Opnd always have the same length in bits (Len).
-
- procedure Bit_Or
- (Left : System.Address;
- Llen : Natural;
- Right : System.Address;
- Rlen : Natural;
- Result : System.Address);
- -- Bitwise "or" of given bit string with result being placed in Result.
- -- The or 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).
-
- procedure Bit_Xor
- (Left : System.Address;
- Llen : Natural;
- Right : System.Address;
- Rlen : Natural;
- Result : System.Address);
- -- Bitwise "xor" of given bit string with result being placed in Result.
- -- 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).
-
-end System.Bit_Ops;