/[pearpc]/src/tools/crc32defs.h
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Contents of /src/tools/crc32defs.h

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Revision 1 - (show annotations)
Wed Sep 5 17:11:21 2007 UTC (11 years, 10 months ago) by dpavlin
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import upstream CVS
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

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