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Diffstat (limited to 'src/lib/crc16.c')
| -rw-r--r-- | src/lib/crc16.c | 64 |
1 files changed, 0 insertions, 64 deletions
diff --git a/src/lib/crc16.c b/src/lib/crc16.c deleted file mode 100644 index 55af8647..00000000 --- a/src/lib/crc16.c +++ /dev/null @@ -1,64 +0,0 @@ -/* - * Ouroboros - Copyright (C) 2016 - 2026 - * - * 16-bit Cyclic Redundancy Check (CCITT-FALSE variant) - * - * Dimitri Staessens <dimitri@ouroboros.rocks> - * Sander Vrijders <sander@ouroboros.rocks> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public License - * version 2.1 as published by the Free Software Foundation. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., http://www.fsf.org/about/contact/. - */ - -/* - * CRC-16/CCITT-FALSE (reveng catalog, alias CRC-16/IBM-3740): - * poly = 0x1021 - * init = 0xffff - * refin = false - * refout = false - * xorout = 0x0000 - * check = crc16_ccitt_false("123456789") == 0x29b1 - */ - -#include "config.h" - -#include <ouroboros/crc16.h> - -/* Bit-by-bit MSB-first CRC. Header-check use case rarely exceeds a - * few hundred bytes; a 256-entry uint16_t table costs 512 B of - * .rodata and is easy to add later if profiling demands it. - */ -void crc16_ccitt_false(uint16_t * crc, - const void * buf, - size_t len) -{ - const uint8_t * p; - uint16_t c; - size_t n; - int i; - - p = (const uint8_t *) buf; - c = *crc ^ 0xffff; - - for (n = 0; n < len; n++) { - c ^= ((uint16_t) p[n]) << 8; - for (i = 0; i < 8; i++) { - if (c & 0x8000) - c = (uint16_t) ((c << 1) ^ 0x1021); - else - c = (uint16_t) (c << 1); - } - } - - *crc = c; -} |