bmp_crc.c File Reference

CRC32 routines for BMP LPC1768. More...

#include <stdint.h>

Functions
uint32_t	crc32 (void *buf, uint32_t len, uint32_t crc)
	Compute CRC32 for a buffer of given length.
uint32_t	crc32_chk (void *buf, uint32_t len)
	Compute the CRC of a buffer.
void	crc32_buf (void *buf, uint32_t len)
	Compute and insert CRC32 of a buffer where the CRC is placed in the last 4 bytes.

Variables
const uint32_t	crc_table []
	CRC constants, precomputed from CRC polynomial.

Detailed Description

CRC32 routines for BMP LPC1768.

Author

Steve Temple, APT Group, School of Computer Science

Function Documentation

crc32()

uint32_t crc32	(	void *	buf,
		uint32_t	len,
		uint32_t	crc
	)

Compute CRC32 for a buffer of given length.

Parameters

[in]	buf	the data to compute the CRC of
[in]	len	number of bytes in buf
[in]	crc	can be 0xffffffff to start checking, or result of a previous call.

Returns

The final result needs to be inverted to produce valid CRC32.

crc32_chk()

uint32_t crc32_chk	(	void *	buf,
		uint32_t	len
	)

Compute the CRC of a buffer.

Parameters

[in]	buf	the data to compute the CRC of
[in]	len	number of bytes in buf

Returns

The CRC of the buffer

crc32_buf()

void crc32_buf	(	void *	buf,
		uint32_t	len
	)

Compute and insert CRC32 of a buffer where the CRC is placed in the last 4 bytes.

Parameters

[in]	buf	the data to compute the CRC of
[in]	len	number of bytes in buf