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authorstepan <stepan@coresystems.de>2006-10-09 22:35:45 +0000
committerStefan Reinauer <stepan@openbios.org>2006-10-09 22:35:45 +0000
commitd3eabbd77c6724f2b8c5d610273af25e7655a1ee (patch)
tree41511968f3af4b7b55ccd2d42435ec7a3bd97e23 /src
parentaa8e3d409f5b59295aa5038c094e3ee3dd87d8d1 (diff)
replace table based crc with computational one. by Ed Swierk.
X-Signed-Off-By: <stepan@coresystems.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2451 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src')
-rw-r--r--src/lib/xmodem.c53
1 files changed, 11 insertions, 42 deletions
diff --git a/src/lib/xmodem.c b/src/lib/xmodem.c
index aaa98b88ec..aca6e49d58 100644
--- a/src/lib/xmodem.c
+++ b/src/lib/xmodem.c
@@ -39,49 +39,18 @@ static void _outbyte(unsigned char c)
uart8250_tx_byte(TTYS0_BASE, c);
}
-/* CRC16 implementation acording to CCITT standards */
-
-static const unsigned short crc16tab[256]= {
- 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,
- 0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,
- 0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,0x72f7,0x62d6,
- 0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de,
- 0x2462,0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485,
- 0xa56a,0xb54b,0x8528,0x9509,0xe5ee,0xf5cf,0xc5ac,0xd58d,
- 0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,0x46b4,
- 0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc,
- 0x48c4,0x58e5,0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823,
- 0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,0x9969,0xa90a,0xb92b,
- 0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12,
- 0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a,
- 0x6ca6,0x7c87,0x4ce4,0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41,
- 0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,0x8d68,0x9d49,
- 0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70,
- 0xff9f,0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78,
- 0x9188,0x81a9,0xb1ca,0xa1eb,0xd10c,0xc12d,0xf14e,0xe16f,
- 0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,0x6067,
- 0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e,
- 0x02b1,0x1290,0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256,
- 0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,0xe54f,0xd52c,0xc50d,
- 0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405,
- 0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c,
- 0x26d3,0x36f2,0x0691,0x16b0,0x6657,0x7676,0x4615,0x5634,
- 0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,0xb98a,0xa9ab,
- 0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3,
- 0xcb7d,0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a,
- 0x4a75,0x5a54,0x6a37,0x7a16,0x0af1,0x1ad0,0x2ab3,0x3a92,
- 0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,0x8dc9,
- 0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1,
- 0xef1f,0xff3e,0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8,
- 0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,0x3eb2,0x0ed1,0x1ef0
-};
-
-static unsigned short crc16_ccitt(const void *buf, int len)
+static unsigned short crc16_ccitt(const unsigned char *buf, int sz)
{
- register int counter;
- register unsigned short crc = 0;
- for( counter = 0; counter < len; counter++)
- crc = (crc<<8) ^ crc16tab[((crc>>8) ^ *(char *)buf++)&0x00FF];
+ unsigned short crc = 0;
+ while (--sz >= 0) {
+ int i;
+ crc ^= (unsigned short) *buf++ << 8;
+ for (i = 0; i < 8; i++)
+ if (crc & 0x8000)
+ crc = crc << 1 ^ 0x1021;
+ else
+ crc <<= 1;
+ }
return crc;
}