111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*
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* eth_checksum.c
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*
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* Created on: 13 ìàð. 2023 ã.
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* Author: sychev
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*/
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#include "free_rtos/ethernet_ip/eth_checksum.h"
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#include "free_rtos/base/swap.h"
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uint16_t eth_calcChksum(uint32_t sum, uint8_t * const data, uint16_t len)
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{
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uint16_t i;
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uint16_t size = len - 1;
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if ( !len )
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return 0;
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for ( i = 0; i < size; i+=2 )
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sum += ((uint16_t)data[i] << 8) + data[i+1];
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if (len & 0x01)
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sum += (uint16_t)data[i] << 8;
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while ( sum >> 16 )
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sum = (sum & 0xFFFF) + (sum >> 16);
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return ~sum;
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}
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uint16_t eth_calcChksum2(uint32_t sum, uint8_t * const hdata, uint16_t hlen, uint8_t * const data, uint16_t len)
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{
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uint16_t i;
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uint16_t hsize = hlen - 1;
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uint16_t size = len - 1;
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if ( (hlen == 0) || (len == 0) )
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return 0;
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for ( i = 0; i < hsize; i+=2 )
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sum += ((uint16_t)hdata[i] << 8) + hdata[i+1];
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if (hlen & 0x01)
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sum += (uint16_t)hdata[i] << 8;
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for ( i = 0; i < size; i+=2 )
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sum += ((uint16_t)data[i] << 8) + data[i+1];
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if (len & 0x01)
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sum += (uint16_t)data[i] << 8;
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while ( sum >> 16 )
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sum = (sum & 0xFFFF) + (sum >> 16);
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return ~sum;
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}
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inline uint32_t calcSum(void * buffer, uint32_t sum, void * const data, uint16_t len) {
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uint32_t * buffer_start32 = (uint32_t*)buffer;
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uint32_t * data_start32 = (uint32_t*)data;
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uint32_t * data_end32 = data_start32 + len/sizeof(uint32_t);
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uint32_t remainder = len%sizeof(uint32_t);
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uint32_t value;
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while(data_start32 < data_end32) {
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value = *data_start32++;
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*buffer_start32++ = value;
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value = __rev16(value);
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sum += (value&0xFFFF) + (value>>16);
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}
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uint16_t * buffer_start16 = (uint16_t*)buffer_start32;
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uint16_t * data_start16 = (uint16_t*)data_start32;
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if(remainder > 1) {
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value = *data_start16++;
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*buffer_start16++ = value;
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value = __rev16(value);
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sum += value;
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}
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uint8_t * buffer_start8 = (uint8_t*)buffer_start16;
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uint8_t * data_start8 = (uint8_t*)data_start16;
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if(remainder == 1) {
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value = *data_start8++;
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*buffer_start8++ = value;
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value = __rev16(value);
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sum += value;
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}
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return sum;
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}
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uint16_t eth_calcChksum3(void * buffer, uint32_t sum, void * const hdata, uint16_t hlen, void * const data, uint16_t len)
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{
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if(hdata != 0) {
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sum = calcSum(buffer, sum, hdata, hlen);
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}
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if(data != 0) {
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sum = calcSum((uint8_t*)buffer + hlen, sum, data, len);
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}
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while (sum >> 16) {
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sum = (sum & 0xFFFF) + (sum >> 16);
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}
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return ~sum;
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}
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