Internet Checksum

Provides a function to calculate the Internet Checksum. More...

Detailed Description

Provides a function to calculate the Internet Checksum.

Files
file	inet_csum.h
	Internet Checksum definitions.

Functions
uint16_t	inet_csum_slice (uint16_t sum, const uint8_t *buf, uint16_t len, size_t accum_len)
	Calculates the unnormalized Internet Checksum of buf, where the buffer provides a slice of the full checksum domain, calculated in order. More...
static uint16_t	inet_csum (uint16_t sum, const uint8_t *buf, uint16_t len)
	Calculates the unnormalized Internet Checksum of buf, where the buffer provides a standalone domain for the checksum. More...

Function Documentation

inet_csum()

static uint16_t inet_csum ( uint16_t  sum, const uint8_t *  buf, uint16_t  len  )

inlinestatic

Calculates the unnormalized Internet Checksum of buf, where the buffer provides a standalone domain for the checksum.

See also

RFC 1071

The Internet Checksum is not normalized (i. e. its 1's complement was not taken of the result) to use it for further calculation. This function, rather than inet_csum_slice(), has been used historically when we are not concerned with padding for an odd number of bytes.

Parameters

[in]	sum	An initial value for the checksum.
[in]	buf	A buffer.
[in]	len	Length of buf in byte.

Returns

The unnormalized Internet Checksum of buf.

Definition at line 72 of file inet_csum.h.

inet_csum_slice()

uint16_t inet_csum_slice	(	uint16_t	sum,
		const uint8_t *	buf,
		uint16_t	len,
		size_t	accum_len
	)

Calculates the unnormalized Internet Checksum of buf, where the buffer provides a slice of the full checksum domain, calculated in order.

See also

RFC 1071

The Internet Checksum is not normalized (i. e. its 1's complement was not taken of the result) to use it for further calculation. This function handles padding an odd number of bytes across the full domain.

Parameters

[in]	sum	An initial value for the checksum.
[in]	buf	A buffer.
[in]	len	Length of buf in byte.
[in]	accum_len	Accumulated length of checksum domain that has already been checksummed.

Returns

The unnormalized Internet Checksum of buf.