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/********************************************************************************/
/* */
/* Bit Manipulation Routines */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: Bits.c 1490 2019-07-26 21:13:22Z kgoldman $ */
/* */
/* Licenses and Notices */
/* */
/* 1. Copyright Licenses: */
/* */
/* - Trusted Computing Group (TCG) grants to the user of the source code in */
/* this specification (the "Source Code") a worldwide, irrevocable, */
/* nonexclusive, royalty free, copyright license to reproduce, create */
/* derivative works, distribute, display and perform the Source Code and */
/* derivative works thereof, and to grant others the rights granted herein. */
/* */
/* - The TCG grants to the user of the other parts of the specification */
/* (other than the Source Code) the rights to reproduce, distribute, */
/* display, and perform the specification solely for the purpose of */
/* developing products based on such documents. */
/* */
/* 2. Source Code Distribution Conditions: */
/* */
/* - Redistributions of Source Code must retain the above copyright licenses, */
/* this list of conditions and the following disclaimers. */
/* */
/* - Redistributions in binary form must reproduce the above copyright */
/* licenses, this list of conditions and the following disclaimers in the */
/* documentation and/or other materials provided with the distribution. */
/* */
/* 3. Disclaimers: */
/* */
/* - THE COPYRIGHT LICENSES SET FORTH ABOVE DO NOT REPRESENT ANY FORM OF */
/* LICENSE OR WAIVER, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, WITH */
/* RESPECT TO PATENT RIGHTS HELD BY TCG MEMBERS (OR OTHER THIRD PARTIES) */
/* THAT MAY BE NECESSARY TO IMPLEMENT THIS SPECIFICATION OR OTHERWISE. */
/* Contact TCG Administration (admin@trustedcomputinggroup.org) for */
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/* membership agreements. */
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/* - THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO EXPRESS OR IMPLIED */
/* WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR */
/* FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, COMPLETENESS, OR */
/* NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS, OR ANY WARRANTY */
/* OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. */
/* */
/* - Without limitation, TCG and its members and licensors disclaim all */
/* liability, including liability for infringement of any proprietary */
/* rights, relating to use of information in this specification and to the */
/* implementation of this specification, and TCG disclaims all liability for */
/* cost of procurement of substitute goods or services, lost profits, loss */
/* of use, loss of data or any incidental, consequential, direct, indirect, */
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/* arising in any way out of use or reliance upon this specification or any */
/* information herein. */
/* */
/* (c) Copyright IBM Corp. and others, 2016 - 2018 */
/* */
/********************************************************************************/
/* 9.2 Bits.c */
/* 9.2.1 Introduction */
/* This file contains bit manipulation routines. They operate on bit arrays. */
/* The 0th bit in the array is the right-most bit in the 0th octet in the array. */
/* NOTE: If pAssert() is defined, the functions will assert if the indicated bit number is outside
of the range of bArray. How the assert is handled is implementation dependent. */
/* 9.2.2 Includes */
#include "Tpm.h"
/* 9.2.3 Functions */
/* 9.2.3.1 TestBit() */
/* This function is used to check the setting of a bit in an array of bits. */
/* Return Values Meaning */
/* TRUE bit is set */
/* FALSE bit is not set */
BOOL
TestBit(
unsigned int bitNum, // IN: number of the bit in 'bArray'
BYTE *bArray, // IN: array containing the bits
unsigned int bytesInArray // IN: size in bytes of 'bArray'
)
{
pAssert(bytesInArray > (bitNum >> 3));
return((bArray[bitNum >> 3] & (1 << (bitNum & 7))) != 0);
}
/* 9.2.3.2 SetBit() */
/* This function will set the indicated bit in bArray. */
void
SetBit(
unsigned int bitNum, // IN: number of the bit in 'bArray'
BYTE *bArray, // IN: array containing the bits
unsigned int bytesInArray // IN: size in bytes of 'bArray'
)
{
pAssert(bytesInArray > (bitNum >> 3));
bArray[bitNum >> 3] |= (1 << (bitNum & 7));
}
/* 9.2.3.3 ClearBit() */
/* This function will clear the indicated bit in bArray. */
void
ClearBit(
unsigned int bitNum, // IN: number of the bit in 'bArray'.
BYTE *bArray, // IN: array containing the bits
unsigned int bytesInArray // IN: size in bytes of 'bArray'
)
{
pAssert(bytesInArray > (bitNum >> 3));
bArray[bitNum >> 3] &= ~(1 << (bitNum & 7));
}
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