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#ifndef _COMPAT_CRC32_H
#define _COMPAT_CRC32_H
#include <linux/version.h>
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,4,18))
#include_next <linux/crc32.h>
#else
static inline u_int ether_crc(int length, u_char *data)
{
static const u_int ethernet_polynomial = 0x04c11db7U;
int crc = 0xffffffff; /* Initial value. */
while (--length >= 0) {
u_char current_octet = *data++;
int bit;
for (bit = 0; bit < 8; bit++, current_octet >>= 1) {
crc = (crc << 1) ^
((crc < 0) ^ (current_octet & 1) ? ethernet_polynomial : 0);
}
}
return crc;
}
static inline unsigned ether_crc_le(int length, unsigned char *data)
{
static unsigned const ethernet_polynomial_le = 0xedb88320U;
unsigned int crc = 0xffffffff; /* Initial value. */
while(--length >= 0) {
unsigned char current_octet = *data++;
int bit;
for (bit = 8; --bit >= 0; current_octet >>= 1) {
if ((crc ^ current_octet) & 1) {
crc >>= 1;
crc ^= ethernet_polynomial_le;
} else
crc >>= 1;
}
}
return crc;
}
#endif
#endif /* _COMPAT_CRC32_H */
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