diff options
Diffstat (limited to 'storage/innobase/include/ut0crc32.h')
| -rw-r--r-- | storage/innobase/include/ut0crc32.h | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/storage/innobase/include/ut0crc32.h b/storage/innobase/include/ut0crc32.h index af6f0bc74e7..2066fa00684 100644 --- a/storage/innobase/include/ut0crc32.h +++ b/storage/innobase/include/ut0crc32.h @@ -1,6 +1,6 @@ /***************************************************************************** -Copyright (c) 2011, 2011, Oracle and/or its affiliates. All Rights Reserved. +Copyright (c) 2011, 2015, Oracle and/or its affiliates. All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software @@ -29,24 +29,33 @@ Created Aug 10, 2011 Vasil Dimov #include "univ.i" /********************************************************************//** -Initializes the data structures used by ut_crc32(). Does not do any +Initializes the data structures used by ut_crc32*(). Does not do any allocations, would not hurt if called twice, but would be pointless. */ -UNIV_INTERN void ut_crc32_init(); /*===========*/ /********************************************************************//** Calculates CRC32. -@param ptr - data over which to calculate CRC32. -@param len - data length in bytes. +@param ptr - data over which to calculate CRC32. +@param len - data length in bytes. @return CRC32 (CRC-32C, using the GF(2) primitive polynomial 0x11EDC6F41, or 0x1EDC6F41 without the high-order bit) */ -typedef ib_uint32_t (*ib_ut_crc32_t)(const byte* ptr, ulint len); +typedef uint32_t (*ut_crc32_func_t)(const byte* ptr, ulint len); -extern ib_ut_crc32_t ut_crc32; +/** Pointer to CRC32 calculation function. */ +extern ut_crc32_func_t ut_crc32; -extern bool ut_crc32_sse2_enabled; +/** Pointer to CRC32 calculation function, which uses big-endian byte order +when converting byte strings to integers internally. */ +extern ut_crc32_func_t ut_crc32_legacy_big_endian; + +/** Pointer to CRC32-byte-by-byte calculation function (byte order agnostic, +but very slow). */ +extern ut_crc32_func_t ut_crc32_byte_by_byte; + +/** Flag that tells whether the CPU supports CRC32 or not */ +extern bool ut_crc32_sse2_enabled; extern bool ut_crc32_power8_enabled; #endif /* ut0crc32_h */ |