Messages in this thread | | | From | Bartlomiej Zolnierkiewicz <> | Subject | Re: [PATCH] lib/libcrc32c | Date | Tue, 30 Mar 2004 20:43:22 +0200 |
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Hi,
On Tuesday 30 of March 2004 19:32, Clay Haapala wrote: > On Fri, 26 Mar 2004, James Morris outgrape: > > These need to be rediffed against the latest Linus kernel. > > > > It may be better to wait until 2.6.5 comes out, so we don't have too > > much new stuff going into the -rc kernels. > > > > > > - James > > Rediffed they are! I see that the digest setkey() api is already part > of -rc3, so because this code is a simple "add" and I will be > on vacation next week when 2.6.5 might be cut, I am providing the > patch now. > > This patch agains 2.6.5-rc3 kernel code implements the CRC32C > algorithm. The routines are based on the same design as the > existing CRC32 code. Licensing is intended to be identical (GPL).
+/* + * This is the CRC-32C table + * Generated with: + * width = 32 bits + * poly = 0x1EDC6F41 + * reflect input bytes = true + * reflect output bytes = true + */ + +static u32 crc32c_table[256] = {
Tables are build time generated in case of CRC32 (lib/gen_crc32table.c) so you can trade some performance for smaller size of the table.
[ However I don't know how useful is this. ]
+/*EXPORT_SYMBOL(crc32c_be);*/ + +#if CRC_BE_BITS == 1 +u32 attribute((pure)) +crc32_be(u32 crc, unsigned char const *p, size_t len) +{ + int i; + while (len--) { + crc ^= *p++ << 24; + for (i = 0; i < 8; i++) + crc = + (crc << 1) ^ ((crc & 0x80000000) ? CRC32C_POLY_BE : + 0); + } + return crc; +} +#endif
Is there any reason in adding crc32_be() until it is finished (LE version) and/or needed?
Regards, Bartlomiej
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