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Diffstat (limited to 'src/tpm2/Bits.c')
| -rw-r--r-- | src/tpm2/Bits.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/src/tpm2/Bits.c b/src/tpm2/Bits.c new file mode 100644 index 0000000..5fb4785 --- /dev/null +++ b/src/tpm2/Bits.c @@ -0,0 +1,114 @@ +/********************************************************************************/ +/* */ +/* 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 */ +/* information on specification licensing rights available through TCG */ +/* membership agreements. */ +/* */ +/* - 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, */ +/* or special damages, whether under contract, tort, warranty or otherwise, */ +/* 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)); +} |