Incluse internet checksum functions. More...

Functions
static u16_t	lwip_standard_chksum (void *dataptr, u16_t len)
	lwip checksum
static u16_t	lwip_standard_chksum (void *dataptr, int len)
	An optimized checksum routine.
u16_t	inet_chksum_pbuf (struct pbuf *p)
	Calculate a checksum over a chain of pbufs (without pseudo-header, much like inet_chksum only pbufs are used).
u16_t	lwip_chksum_copy (void dst, const void src, u16_t len)
	Safe but slow: first call MEMCPY, then call LWIP_CHKSUM.

Detailed Description

Incluse internet checksum functions.

Definition in file inet_chksum.c.

Function Documentation

u16_t inet_chksum_pbuf ( struct pbuf * p )

Calculate a checksum over a chain of pbufs (without pseudo-header, much like inet_chksum only pbufs are used).

Parameters:

p	pbuf chain over that the checksum should be calculated

Definition at line 409 of file inet_chksum.c.

Safe but slow: first call MEMCPY, then call LWIP_CHKSUM.

For architectures with big caches, data might still be in cache when generating the checksum after copying.

Definition at line 445 of file inet_chksum.c.

static u16_t lwip_standard_chksum	(	void *	dataptr,
		int	len
	)		`[static]`

An optimized checksum routine.

Basically, it uses loop-unrolling on the checksum loop, treating the head and tail bytes specially, whereas the inner loop acts on 8 bytes at a time.

start of buffer to be checksummed. May be an odd byte address. number of bytes in the buffer to be checksummed.
Returns:
host order (!) lwip checksum (non-inverted Internet sum)
by Curt McDowell, Broadcom Corp. December 8th, 2005

Definition at line 135 of file inet_chksum.c.

static u16_t lwip_standard_chksum	(	void *	dataptr,
		u16_t	len
	)		`[static]`

lwip checksum

Parameters:

dataptr	points to start of data to be summed at any boundary
len	length of data to be summed

Note:: accumulator size limits summable length to 64k; host endianess is irrelevant (p3 RFC1071)

Definition at line 81 of file inet_chksum.c.