ODP CHECKSUM

API Description

Checksum functions.

Functions
uint16_t	odp_chksum_ones_comp16 (const void *data, uint32_t data_len)
	Ones' complement sum of 16-bit words. More...

Function Documentation

odp_chksum_ones_comp16()

uint16_t odp_chksum_ones_comp16	(	const void *	data,
		uint32_t	data_len
	)

Ones' complement sum of 16-bit words.

Calculates 16-bit ones' complement sum over the data. In case of odd number of bytes, calculation uses a zero byte as padding at the end. This algorithm may be used as part of e.g. IPv4/UDP/TCP checksum generation and checking.

Parameters

data	Pointer to data. Data address must be 16-bit aligned in minimum.
data_len	Data length in bytes. In case of an odd number, calculation includes one byte of padding.

Returns

Ones' complement sum

Examples

odp_packet_gen.c.