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crc: move static table

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Move static table upward in the code so it can be shared with
another 'crc' implementation.
This commit is contained in:
Zdenek Kabelac 2024-10-04 14:02:06 +02:00
parent d07e273aff
commit f55c949410
1 changed files with 40 additions and 35 deletions
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21
lib/misc/crc.c
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@ -18,14 +18,11 @@
#include "lib/misc/crc.h" #include "lib/misc/crc.h"
#include "lib/mm/xlate.h" #include "lib/mm/xlate.h"
/* Calculate an endian-independent CRC of supplied buffer */ /*
#ifndef DEBUG_CRC32 * CRC-32 byte lookup table generated by crc_gen.c
uint32_t calc_crc(uint32_t initial, const uint8_t *buf, uint32_t size) *
#else * Precomputed lookup table for CRC computed with 0xedb88320 polynomial.
static uint32_t _calc_crc_new(uint32_t initial, const uint8_t *buf, uint32_t size) */
#endif
{
/* CRC-32 byte lookup table generated by crc_gen.c */
static const uint32_t _crctab[] = { static const uint32_t _crctab[] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
@ -60,6 +57,14 @@ static uint32_t _calc_crc_new(uint32_t initial, const uint8_t *buf, uint32_t siz
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
}; };
/* Calculate an endian-independent CRC of supplied buffer */
#ifndef DEBUG_CRC32
uint32_t calc_crc(uint32_t initial, const uint8_t *buf, uint32_t size)
#else
static uint32_t _calc_crc_new(uint32_t initial, const uint8_t *buf, uint32_t size)
#endif
{
const uint32_t *start = (const uint32_t *) buf; const uint32_t *start = (const uint32_t *) buf;
const uint32_t *end = (const uint32_t *) (buf + (size & 0xfffffffc)); const uint32_t *end = (const uint32_t *) (buf + (size & 0xfffffffc));
uint32_t crc = initial; uint32_t crc = initial;