p4c/nethash_8h_source.html

#ifndef LIB_NETHASH_H_

#define LIB_NETHASH_H_


#include <cstddef>

#include <cstdint>

#include <vector>


namespace P4::NetHash {


uint16_t crc16(const uint8_t *buf, size_t len);


uint16_t crc16ANSI(const uint8_t *buf, size_t len);


uint16_t crcCCITT(const uint8_t *buf, size_t len);


uint32_t crc32(const uint8_t *buf, size_t len);


uint32_t crc32FCS(const uint8_t *buf, size_t len);


uint16_t csum16(const uint8_t *buf, size_t len);


uint16_t xor16(const uint8_t *buf, size_t len);


uint64_t identity(const uint8_t *buf, size_t len);


}  // namespace P4::NetHash


#endif /* LIB_NETHASH_H_ */

P4::NetHash
A collection of hashing functions commonly used in network protocols.
Definition nethash.cpp:32

P4::NetHash::identity
uint64_t identity(const uint8_t *buf, size_t len)
Identity hash – the first (up to) 64bits of the values (i.e. indexes 0 to 7).
Definition nethash.cpp:242

P4::NetHash::crc32
uint32_t crc32(const uint8_t *buf, size_t len)
Definition nethash.cpp:166

P4::NetHash::crcCCITT
uint16_t crcCCITT(const uint8_t *buf, size_t len)
CRC16-CCITT (parameters: NO bit-reflection, polynomial 0x1021, init = ~0 and xor_out = 0).
Definition nethash.cpp:174

P4::NetHash::csum16
uint16_t csum16(const uint8_t *buf, size_t len)
16-bit ones' complement checksum (used in IP, TCP, UDP, ...).
Definition nethash.cpp:178

P4::NetHash::crc32FCS
uint32_t crc32FCS(const uint8_t *buf, size_t len)
Definition nethash.cpp:170

P4::NetHash::xor16
uint16_t xor16(const uint8_t *buf, size_t len)
A 16-bit xor of the values.
Definition nethash.cpp:222

P4::NetHash::crc16ANSI
uint16_t crc16ANSI(const uint8_t *buf, size_t len)
Definition nethash.cpp:162

P4::NetHash::crc16
uint16_t crc16(const uint8_t *buf, size_t len)
CRC-16 used in BMv2 (parameters: bit-reflection, polynomial 0x8005, init = 0 and xor_out = 0).
Definition nethash.cpp:158