CRC32 (Cyclic Redundancy Check)

Data Structures
struct	pj_crc32_context

Functions
void	pj_crc32_init (pj_crc32_context *ctx)
pj_uint32_t	pj_crc32_update (pj_crc32_context *ctx, const pj_uint8_t *data, pj_size_t nbytes)
pj_uint32_t	pj_crc32_final (pj_crc32_context *ctx)
pj_uint32_t	pj_crc32_calc (const pj_uint8_t *data, pj_size_t nbytes)

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Detailed Description

This implements CRC32 algorithm. See ITU-T V.42 for the formal specification.

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Function Documentation

pj_uint32_t pj_crc32_calc	(	const pj_uint8_t *	data,
		pj_size_t	nbytes
	)

Perform one-off CRC32 calculation to the specified data.

Parameters:

data	Input data.
nbytes	Length of input data.

Returns:

CRC value of the data.

pj_uint32_t pj_crc32_final

(

pj_crc32_context *

ctx

)

Finalize CRC32 calculation and retrieve the CRC32 value.

Parameters:

ctx	CRC32 context.

Returns:

The current CRC value.

void pj_crc32_init

(

pj_crc32_context *

ctx

)

Initialize CRC32 context.

Parameters:

ctx	CRC32 context.

pj_uint32_t pj_crc32_update	(	pj_crc32_context *	ctx,
		const pj_uint8_t *	data,
		pj_size_t	nbytes
	)

Feed data incrementally to the CRC32 algorithm.

Parameters:

ctx	CRC32 context.
data	Input data.
nbytes	Length of the input data.

Returns:

The current CRC32 value.