100 lines
5 KiB
Ada
100 lines
5 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . B I T _ O P S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2013, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- Operations on packed bit strings
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pragma Compiler_Unit_Warning;
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with System;
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package System.Bit_Ops is
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-- Note: in all the following routines, the System.Address parameters
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-- represent the address of the first byte of an array used to represent
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-- a packed array (of type System.Unsigned_Types.Packed_Bytes{1,2,4})
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-- The length in bits is passed as a separate parameter. Note that all
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-- addresses must be of byte aligned arrays.
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procedure Bit_And
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(Left : System.Address;
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Llen : Natural;
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Right : System.Address;
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Rlen : Natural;
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Result : System.Address);
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-- Bitwise "and" of given bit string with result being placed in Result.
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-- The and operation is allowed to destroy unused bits in the last byte,
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-- i.e. to leave them set in an undefined manner. Note that Left, Right
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-- and Result always have the same length in bits (Len).
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function Bit_Eq
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(Left : System.Address;
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Llen : Natural;
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Right : System.Address;
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Rlen : Natural) return Boolean;
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-- Left and Right are the addresses of two bit packed arrays with Llen
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-- and Rlen being the respective length in bits. The routine compares the
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-- two bit strings for equality, being careful not to include the unused
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-- bits in the final byte. Note that the result is always False if Rlen
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-- is not equal to Llen.
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procedure Bit_Not
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(Opnd : System.Address;
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Len : Natural;
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Result : System.Address);
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-- Bitwise "not" of given bit string with result being placed in Result.
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-- The not operation is allowed to destroy unused bits in the last byte,
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-- i.e. to leave them set in an undefined manner. Note that Result and
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-- Opnd always have the same length in bits (Len).
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procedure Bit_Or
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(Left : System.Address;
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Llen : Natural;
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Right : System.Address;
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Rlen : Natural;
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Result : System.Address);
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-- Bitwise "or" of given bit string with result being placed in Result.
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-- The or operation is allowed to destroy unused bits in the last byte,
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-- i.e. to leave them set in an undefined manner. Note that Left, Right
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-- and Result always have the same length in bits (Len).
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procedure Bit_Xor
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(Left : System.Address;
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Llen : Natural;
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Right : System.Address;
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Rlen : Natural;
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Result : System.Address);
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-- Bitwise "xor" of given bit string with result being placed in Result.
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-- The xor operation is allowed to destroy unused bits in the last byte,
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-- i.e. to leave them set in an undefined manner. Note that Left, Right
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-- and Result always have the same length in bits (Len).
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end System.Bit_Ops;
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