Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/lib/crc32defs.h
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 1072 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * There are multiple 16-bit CRC polynomials in common use, but this is |
3 | * *the* standard CRC-32 polynomial, first popularized by Ethernet. |
4 | * x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0 |
5 | */ |
6 | #define CRCPOLY_LE 0xedb88320 |
7 | #define CRCPOLY_BE 0x04c11db7 |
8 | |
9 | /* How many bits at a time to use. Requires a table of 4<<CRC_xx_BITS bytes. */ |
10 | /* For less performance-sensitive, use 4 */ |
11 | #ifndef CRC_LE_BITS |
12 | # define CRC_LE_BITS 8 |
13 | #endif |
14 | #ifndef CRC_BE_BITS |
15 | # define CRC_BE_BITS 8 |
16 | #endif |
17 | |
18 | /* |
19 | * Little-endian CRC computation. Used with serial bit streams sent |
20 | * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. |
21 | */ |
22 | #if CRC_LE_BITS > 8 || CRC_LE_BITS < 1 || CRC_LE_BITS & CRC_LE_BITS-1 |
23 | # error CRC_LE_BITS must be a power of 2 between 1 and 8 |
24 | #endif |
25 | |
26 | /* |
27 | * Big-endian CRC computation. Used with serial bit streams sent |
28 | * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. |
29 | */ |
30 | #if CRC_BE_BITS > 8 || CRC_BE_BITS < 1 || CRC_BE_BITS & CRC_BE_BITS-1 |
31 | # error CRC_BE_BITS must be a power of 2 between 1 and 8 |
32 | #endif |