crc32_small.c File Reference

CRC32 calculation (size-optimized) More...

#include "check.h"

Functions
static void	crc32_init (void)
void	lzma_crc32_init (void)
uint32_t	lzma_crc32 (const uint8_t *buf, size_t size, uint32_t crc)
	Calculate CRC32. More...

Variables
uint32_t	lzma_crc32_table [1][256]

Detailed Description

CRC32 calculation (size-optimized)

Function Documentation

lzma_crc32()

uint32_t lzma_crc32	(	const uint8_t *	buf,
		size_t	size,
		uint32_t	crc
	)

Calculate CRC32.

Calculate CRC32 using the polynomial from the IEEE 802.3 standard.

Parameters

buf	Pointer to the input buffer
size	Size of the input buffer
crc	Previously returned CRC value. This is used to calculate the CRC of a big buffer in smaller chunks. Set to zero when starting a new calculation.

Returns

Updated CRC value, which can be passed to this function again to continue CRC calculation.

Referenced by lzma_block_header_decode(), lzma_check_update(), and lzma_index_hash_decode().

Variable Documentation

lzma_crc32_table

uint32_t lzma_crc32_table[1][256]

lzma_crc32_table[0] is needed by LZ encoder so we need to keep the array two-dimensional.