diff options
Diffstat (limited to 'lib/crc16.c')
| -rw-r--r-- | lib/crc16.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/lib/crc16.c b/lib/crc16.c index 5c3a803c01e0..9c71eda9bf4b 100644 --- a/lib/crc16.c +++ b/lib/crc16.c @@ -8,7 +8,7 @@ #include <linux/crc16.h> /** CRC table for the CRC-16. The poly is 0x8005 (x^16 + x^15 + x^2 + 1) */ -u16 const crc16_table[256] = { +static const u16 crc16_table[256] = { 0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440, 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, @@ -42,20 +42,19 @@ u16 const crc16_table[256] = { 0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641, 0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040 }; -EXPORT_SYMBOL(crc16_table); /** * crc16 - compute the CRC-16 for the data buffer * @crc: previous CRC value - * @buffer: data pointer + * @p: data pointer * @len: number of bytes in the buffer * * Returns the updated CRC value. */ -u16 crc16(u16 crc, u8 const *buffer, size_t len) +u16 crc16(u16 crc, const u8 *p, size_t len) { while (len--) - crc = crc16_byte(crc, *buffer++); + crc = (crc >> 8) ^ crc16_table[(crc & 0xff) ^ *p++]; return crc; } EXPORT_SYMBOL(crc16); |