65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
/*****************************************************************************
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Copyright (c) 2011, 2018, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License, version 2.0, as published by the
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Free Software Foundation.
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This program is also distributed with certain software (including but not
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limited to OpenSSL) that is licensed under separate terms, as designated in a
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particular file or component or in included license documentation. The authors
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of MySQL hereby grant you an additional permission to link the program and
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your derivative works with the separately licensed software that they have
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included with MySQL.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
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for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*****************************************************************************/
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/** @file include/ut0crc32.h
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CRC32 implementation
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Created Aug 10, 2011 Vasil Dimov
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*******************************************************/
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#ifndef ut0crc32_h
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#define ut0crc32_h
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#include "univ.i"
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/** Initializes the data structures used by ut_crc32*(). Does not do any
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allocations, would not hurt if called twice, but would be pointless. */
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void ut_crc32_init();
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/** Calculates CRC32.
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@param ptr - data over which to calculate CRC32.
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@param len - data length in bytes.
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@return CRC32 (CRC-32C, using the GF(2) primitive polynomial 0x11EDC6F41,
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or 0x1EDC6F41 without the high-order bit) */
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typedef uint32_t (*ut_crc32_func_t)(const byte *ptr, ulint len);
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/** Pointer to CRC32 calculation function. */
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extern ut_crc32_func_t ut_crc32;
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/** Pointer to CRC32 calculation function, which uses big-endian byte order
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when converting byte strings to integers internally. */
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extern ut_crc32_func_t ut_crc32_legacy_big_endian;
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/** Pointer to CRC32-byte-by-byte calculation function (byte order agnostic,
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but very slow). */
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extern ut_crc32_func_t ut_crc32_byte_by_byte;
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/** Flag that tells whether the CPU supports CRC32 or not.
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The CRC32 instructions are part of the SSE4.2 instruction set. */
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extern bool ut_crc32_cpu_enabled;
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#endif /* ut0crc32_h */
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