/*
* Description: Caculate multicast hash value by CRC32
*
* Parameters:
* In:
* pbyMultiAddr - Multicast Address
* Out:
* none
*
* Return Value: Hash value
*
*/
unsigned char ETHbyGetHashIndexByCrc32 (unsigned char *pbyMultiAddr)
{
int ii;
unsigned char byTmpHash;
unsigned char byHash = 0;
// get the least 6-bits from CRC generator
byTmpHash = (unsigned char)(CRCdwCrc32(pbyMultiAddr, ETH_ALEN,
0xFFFFFFFFL) & 0x3F);
// reverse most bit to least bit
for (ii = 0; ii < (sizeof(byTmpHash) * 8); ii++) {
byHash <<= 1;
if (byTmpHash & 0x01)
byHash |= 1;
byTmpHash >>= 1;
}
// adjust 6-bits to the right most
return (byHash >> 2);
}
BYTE ETHbyGetHashIndexByCrc32(PBYTE pbyMultiAddr)
{
int ii;
BYTE byTmpHash;
BYTE byHash = 0;
byTmpHash = (BYTE)(CRCdwCrc32(pbyMultiAddr, ETH_ALEN,
0xFFFFFFFFL) & 0x3F);
for (ii = 0; ii < (sizeof(byTmpHash) * 8); ii++) {
byHash <<= 1;
if (byTmpHash & 0x01)
byHash |= 1;
byTmpHash >>= 1;
}
return byHash >> 2;
}
BYTE ETHbyGetHashIndexByCrc32(PBYTE pbyMultiAddr)
{
int ii;
BYTE byTmpHash;
BYTE byHash = 0;
/* get the least 6-bits from CRC generator */
byTmpHash = (BYTE)(CRCdwCrc32(pbyMultiAddr, ETH_ALEN,
0xFFFFFFFFL) & 0x3F);
/* reverse most bit to least bit */
for (ii = 0; ii < (sizeof(byTmpHash) * 8); ii++) {
byHash <<= 1;
if (byTmpHash & 0x01)
byHash |= 1;
byTmpHash >>= 1;
}
/* adjust 6-bits to the right most */
return byHash >> 2;
}
