mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
e381317fbf
cpu, nrf5x_common: fix sign-compare in periph/flashpage
drivers, periph_common: fix sign-compare in flashpage
cpu, sam0_common: fix sign-compare error in periph/gpio
cpu, cc2538: fix sign-compare in periph/timer
cpu, sam3: fix sign-compare in periph/gpio
cpu, stm32_common: fix sign-compare in periph/pwm
cpu, stm32_common: fix sign-compare in periph/timer
cpu, stm32_common: fix sign-compare in periph/flashpage
cpu, nrf5x_common: fix sign-compare in radio/nrfmin
cpu, samd21: fix sign-compare in periph/pwm
cpu, ezr32wg: fix sign-compare in periph/gpio
cpu, ezr32wg: fix sign-compare in periph/timer
drivers, ethos: fix sign-compare
sys, net: fix sign-compare
cpu, atmega_common: fix sign-compare error
cpu, msp430fxyz: fix sign-compare in periph/gpio
boards, msb-430-common: fix sign-compare in board_init
driver, cc2420: fix sign-compared
sys/net: fix sign-compare in gnrc_tftp
driver, pcd8544: fix sign-compare
driver, pn532: fix sign-compare
driver, sdcard_spi: fix sign-compare
tests: fix sign_compare
sys/net, lwmac: fix sign_compare
pkg, lwip: fix sign-compare
boards, waspmote: make CORECLOCK unsigned long to fix sign_compare error
tests, sock_ip: fix sign compare
tests, msg_avail: fix sign compare
tests, sock_udp: fix sign compare
boards: fix sign-compare for calliope and microbit matrix
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
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* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @{
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*
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* @file
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*/
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#include <inttypes.h>
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#include <stdio.h>
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#include "od.h"
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#include "net/inet_csum.h"
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#define ENABLE_DEBUG (0)
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#include "debug.h"
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uint16_t inet_csum_slice(uint16_t sum, const uint8_t *buf, uint16_t len, size_t accum_len)
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{
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uint32_t csum = sum;
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DEBUG("inet_sum: sum = 0x%04" PRIx16 ", len = %" PRIu16, sum, len);
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#if ENABLE_DEBUG
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#ifdef MODULE_OD
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DEBUG(", buf:\n");
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od_hex_dump(buf, len, OD_WIDTH_DEFAULT);
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#else
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DEBUG(", buf output only with od module\n");
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#endif
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#endif
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if (len == 0)
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return csum;
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if (accum_len & 1) { /* if accumulated length is odd */
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csum += *buf; /* add first byte as bottom half of 16-byte word */
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buf++;
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len--;
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accum_len++;
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}
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for (unsigned i = 0; i < (len >> 1); buf += 2, i++) {
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csum += (uint16_t)(*buf << 8) + *(buf + 1); /* group bytes by 16-byte words */
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/* and add them */
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}
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if ((accum_len + len) & 1) /* if accumulated length is odd */
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csum += (uint16_t)(*buf << 8); /* add last byte as top half of 16-byte word */
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while (csum >> 16) {
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uint16_t carry = csum >> 16;
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csum = (csum & 0xffff) + carry;
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}
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DEBUG("inet_sum: new sum = 0x%04" PRIx32 "\n", csum);
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return csum;
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}
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/** @} */
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