static void
genCrcTable (u_int32_t *CRCTable)
{
- int ii, jj;
- u_int32_t crc;
-
- for (ii = 0; ii < CRC_TABLE_ENTRIES; ii++)
- {
- crc = ii;
- for (jj = 8; jj > 0; jj--)
- {
- if (crc & 1)
- crc = (crc >> 1) ^ CRC32_POLYNOMIAL;
- else
- crc >>= 1;
- }
- CRCTable[ii] = crc;
- }
-
- crcTableInit++;
+ int ii, jj;
+ u_int32_t crc;
+
+ for (ii = 0; ii < CRC_TABLE_ENTRIES; ii++)
+ {
+ crc = ii;
+ for (jj = 8; jj > 0; jj--)
+ {
+ if (crc & 1)
+ crc = (crc >> 1) ^ CRC32_POLYNOMIAL;
+ else
+ crc >>= 1;
+ }
+ CRCTable[ii] = crc;
+ }
+
+ crcTableInit++;
}
void
sbeCrc (u_int8_t *buffer, /* data buffer to crc */
- u_int32_t count, /* length of block in bytes */
- u_int32_t initialCrc, /* starting CRC */
- u_int32_t *result)
+ u_int32_t count, /* length of block in bytes */
+ u_int32_t initialCrc, /* starting CRC */
+ u_int32_t *result)
{
- u_int32_t *tbl = 0;
- u_int32_t temp1, temp2, crc;
-
- /*
- * if table not yet created, do so. Don't care about "extra" time
- * checking this every time sbeCrc() is called, since CRC calculations are
- * already time consuming
- */
- if (!crcTableInit)
- {
+ u_int32_t *tbl = 0;
+ u_int32_t temp1, temp2, crc;
+
+ /*
+ * if table not yet created, do so. Don't care about "extra" time
+ * checking this every time sbeCrc() is called, since CRC calculations
+ * are already time consuming
+ */
+ if (!crcTableInit)
+ {
#ifdef STATIC_CRC_TABLE
- tbl = &CRCTable;
- genCrcTable (tbl);
+ tbl = &CRCTable;
+ genCrcTable (tbl);
#else
- tbl = (u_int32_t *) OS_kmalloc (CRC_TABLE_ENTRIES * sizeof (u_int32_t));
- if (tbl == 0)
- {
- *result = 0; /* dummy up return value due to malloc
- * failure */
- return;
- }
- genCrcTable (tbl);
+ tbl = (u_int32_t *) OS_kmalloc (CRC_TABLE_ENTRIES * sizeof (u_int32_t));
+ if (tbl == 0)
+ {
+ *result = 0; /* dummy up return value due to malloc
+ * failure */
+ return;
+ }
+ genCrcTable (tbl);
#endif
- }
- /* inverting bits makes ZMODEM & PKZIP compatible */
- crc = initialCrc ^ 0xFFFFFFFFL;
+ }
+ /* inverting bits makes ZMODEM & PKZIP compatible */
+ crc = initialCrc ^ 0xFFFFFFFFL;
- while (count-- != 0)
- {
- temp1 = (crc >> 8) & 0x00FFFFFFL;
- temp2 = tbl[((int) crc ^ *buffer++) & 0xff];
- crc = temp1 ^ temp2;
- }
+ while (count-- != 0)
+ {
+ temp1 = (crc >> 8) & 0x00FFFFFFL;
+ temp2 = tbl[((int) crc ^ *buffer++) & 0xff];
+ crc = temp1 ^ temp2;
+ }
- crc ^= 0xFFFFFFFFL;
+ crc ^= 0xFFFFFFFFL;
- *result = crc;
+ *result = crc;
#ifndef STATIC_CRC_TABLE
- crcTableInit = 0;
- OS_kfree (tbl);
+ crcTableInit = 0;
+ OS_kfree (tbl);
#endif
}