mirror of
https://github.com/MariaDB/server.git
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d9d0e8fd60
In commit 9ec7819c58 the CRC-32 function
signatures had been unified somewhat, but not enough.
clang -fsanitize=undefined would flag a function pointer signature
mismatch between const char* and const void*, but not between
uint32_t and unsigned. We try to fix both inconsistencies anyway.
Reviewed by: Vladislav Vaintroub
719 lines
24 KiB
C++
719 lines
24 KiB
C++
/* Copyright (c) 2020, 2021, MariaDB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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/*
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* Copyright 2016 Ferry Toth, Exalon Delft BV, The Netherlands
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the author be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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* Ferry Toth
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* ftoth@exalondelft.nl
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*
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* https://github.com/htot/crc32c
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*
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* Modified by Facebook
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*
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* Original intel whitepaper:
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* "Fast CRC Computation for iSCSI Polynomial Using CRC32 Instruction"
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* https://www.intel.com/content/dam/www/public/us/en/documents/white-papers/crc-iscsi-polynomial-crc32-instruction-paper.pdf
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*
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* This version is from the folly library, created by Dave Watson <davejwatson@fb.com>
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*
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*/
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#include <stdint.h>
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#include <nmmintrin.h>
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#include <wmmintrin.h>
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#ifdef _MSC_VER
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# define USE_PCLMUL /* nothing */
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#else
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# define USE_PCLMUL __attribute__((target("sse4.2,pclmul")))
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#endif
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#define CRCtriplet(crc, buf, offset) \
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crc##0 = _mm_crc32_u64(crc##0, *(buf##0 + offset)); \
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crc##1 = _mm_crc32_u64(crc##1, *(buf##1 + offset)); \
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crc##2 = _mm_crc32_u64(crc##2, *(buf##2 + offset));
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#define CRCduplet(crc, buf, offset) \
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crc##0 = _mm_crc32_u64(crc##0, *(buf##0 + offset)); \
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crc##1 = _mm_crc32_u64(crc##1, *(buf##1 + offset));
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#define CRCsinglet(crc, buf, offset) \
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crc = _mm_crc32_u64(crc, *(uint64_t*)(buf + offset));
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// Numbers taken directly from intel whitepaper.
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// clang-format off
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static const uint64_t clmul_constants alignas(16) [] = {
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0x14cd00bd6, 0x105ec76f0, 0x0ba4fc28e, 0x14cd00bd6,
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0x1d82c63da, 0x0f20c0dfe, 0x09e4addf8, 0x0ba4fc28e,
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0x039d3b296, 0x1384aa63a, 0x102f9b8a2, 0x1d82c63da,
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0x14237f5e6, 0x01c291d04, 0x00d3b6092, 0x09e4addf8,
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0x0c96cfdc0, 0x0740eef02, 0x18266e456, 0x039d3b296,
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0x0daece73e, 0x0083a6eec, 0x0ab7aff2a, 0x102f9b8a2,
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0x1248ea574, 0x1c1733996, 0x083348832, 0x14237f5e6,
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0x12c743124, 0x02ad91c30, 0x0b9e02b86, 0x00d3b6092,
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0x018b33a4e, 0x06992cea2, 0x1b331e26a, 0x0c96cfdc0,
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0x17d35ba46, 0x07e908048, 0x1bf2e8b8a, 0x18266e456,
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0x1a3e0968a, 0x11ed1f9d8, 0x0ce7f39f4, 0x0daece73e,
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0x061d82e56, 0x0f1d0f55e, 0x0d270f1a2, 0x0ab7aff2a,
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0x1c3f5f66c, 0x0a87ab8a8, 0x12ed0daac, 0x1248ea574,
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0x065863b64, 0x08462d800, 0x11eef4f8e, 0x083348832,
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0x1ee54f54c, 0x071d111a8, 0x0b3e32c28, 0x12c743124,
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0x0064f7f26, 0x0ffd852c6, 0x0dd7e3b0c, 0x0b9e02b86,
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0x0f285651c, 0x0dcb17aa4, 0x010746f3c, 0x018b33a4e,
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0x1c24afea4, 0x0f37c5aee, 0x0271d9844, 0x1b331e26a,
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0x08e766a0c, 0x06051d5a2, 0x093a5f730, 0x17d35ba46,
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0x06cb08e5c, 0x11d5ca20e, 0x06b749fb2, 0x1bf2e8b8a,
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0x1167f94f2, 0x021f3d99c, 0x0cec3662e, 0x1a3e0968a,
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0x19329634a, 0x08f158014, 0x0e6fc4e6a, 0x0ce7f39f4,
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0x08227bb8a, 0x1a5e82106, 0x0b0cd4768, 0x061d82e56,
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0x13c2b89c4, 0x188815ab2, 0x0d7a4825c, 0x0d270f1a2,
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0x10f5ff2ba, 0x105405f3e, 0x00167d312, 0x1c3f5f66c,
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0x0f6076544, 0x0e9adf796, 0x026f6a60a, 0x12ed0daac,
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0x1a2adb74e, 0x096638b34, 0x19d34af3a, 0x065863b64,
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0x049c3cc9c, 0x1e50585a0, 0x068bce87a, 0x11eef4f8e,
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0x1524fa6c6, 0x19f1c69dc, 0x16cba8aca, 0x1ee54f54c,
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0x042d98888, 0x12913343e, 0x1329d9f7e, 0x0b3e32c28,
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0x1b1c69528, 0x088f25a3a, 0x02178513a, 0x0064f7f26,
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0x0e0ac139e, 0x04e36f0b0, 0x0170076fa, 0x0dd7e3b0c,
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0x141a1a2e2, 0x0bd6f81f8, 0x16ad828b4, 0x0f285651c,
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0x041d17b64, 0x19425cbba, 0x1fae1cc66, 0x010746f3c,
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0x1a75b4b00, 0x18db37e8a, 0x0f872e54c, 0x1c24afea4,
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0x01e41e9fc, 0x04c144932, 0x086d8e4d2, 0x0271d9844,
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0x160f7af7a, 0x052148f02, 0x05bb8f1bc, 0x08e766a0c,
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0x0a90fd27a, 0x0a3c6f37a, 0x0b3af077a, 0x093a5f730,
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0x04984d782, 0x1d22c238e, 0x0ca6ef3ac, 0x06cb08e5c,
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0x0234e0b26, 0x063ded06a, 0x1d88abd4a, 0x06b749fb2,
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0x04597456a, 0x04d56973c, 0x0e9e28eb4, 0x1167f94f2,
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0x07b3ff57a, 0x19385bf2e, 0x0c9c8b782, 0x0cec3662e,
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0x13a9cba9e, 0x0e417f38a, 0x093e106a4, 0x19329634a,
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0x167001a9c, 0x14e727980, 0x1ddffc5d4, 0x0e6fc4e6a,
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0x00df04680, 0x0d104b8fc, 0x02342001e, 0x08227bb8a,
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0x00a2a8d7e, 0x05b397730, 0x168763fa6, 0x0b0cd4768,
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0x1ed5a407a, 0x0e78eb416, 0x0d2c3ed1a, 0x13c2b89c4,
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0x0995a5724, 0x1641378f0, 0x19b1afbc4, 0x0d7a4825c,
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0x109ffedc0, 0x08d96551c, 0x0f2271e60, 0x10f5ff2ba,
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0x00b0bf8ca, 0x00bf80dd2, 0x123888b7a, 0x00167d312,
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0x1e888f7dc, 0x18dcddd1c, 0x002ee03b2, 0x0f6076544,
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0x183e8d8fe, 0x06a45d2b2, 0x133d7a042, 0x026f6a60a,
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0x116b0f50c, 0x1dd3e10e8, 0x05fabe670, 0x1a2adb74e,
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0x130004488, 0x0de87806c, 0x000bcf5f6, 0x19d34af3a,
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0x18f0c7078, 0x014338754, 0x017f27698, 0x049c3cc9c,
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0x058ca5f00, 0x15e3e77ee, 0x1af900c24, 0x068bce87a,
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0x0b5cfca28, 0x0dd07448e, 0x0ded288f8, 0x1524fa6c6,
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0x059f229bc, 0x1d8048348, 0x06d390dec, 0x16cba8aca,
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0x037170390, 0x0a3e3e02c, 0x06353c1cc, 0x042d98888,
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0x0c4584f5c, 0x0d73c7bea, 0x1f16a3418, 0x1329d9f7e,
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0x0531377e2, 0x185137662, 0x1d8d9ca7c, 0x1b1c69528,
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0x0b25b29f2, 0x18a08b5bc, 0x19fb2a8b0, 0x02178513a,
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0x1a08fe6ac, 0x1da758ae0, 0x045cddf4e, 0x0e0ac139e,
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0x1a91647f2, 0x169cf9eb0, 0x1a0f717c4, 0x0170076fa,
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};
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// Compute the crc32c value for buffer smaller than 8
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USE_PCLMUL
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static inline void align_to_8(
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size_t len,
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uint64_t& crc0, // crc so far, updated on return
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const unsigned char*& next) { // next data pointer, updated on return
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uint32_t crc32bit = static_cast<uint32_t>(crc0);
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if (len & 0x04) {
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crc32bit = _mm_crc32_u32(crc32bit, *(uint32_t*)next);
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next += sizeof(uint32_t);
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}
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if (len & 0x02) {
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crc32bit = _mm_crc32_u16(crc32bit, *(uint16_t*)next);
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next += sizeof(uint16_t);
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}
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if (len & 0x01) {
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crc32bit = _mm_crc32_u8(crc32bit, *(next));
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next++;
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}
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crc0 = crc32bit;
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}
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//
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// CombineCRC performs pclmulqdq multiplication of 2 partial CRC's and a well
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// chosen constant and xor's these with the remaining CRC.
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//
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USE_PCLMUL
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static inline uint64_t CombineCRC(
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size_t block_size,
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uint64_t crc0,
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uint64_t crc1,
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uint64_t crc2,
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const uint64_t* next2) {
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const auto multiplier =
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*(reinterpret_cast<const __m128i*>(clmul_constants) + block_size - 1);
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const auto crc0_xmm = _mm_set_epi64x(0, crc0);
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const auto res0 = _mm_clmulepi64_si128(crc0_xmm, multiplier, 0x00);
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const auto crc1_xmm = _mm_set_epi64x(0, crc1);
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const auto res1 = _mm_clmulepi64_si128(crc1_xmm, multiplier, 0x10);
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const auto res = _mm_xor_si128(res0, res1);
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crc0 = _mm_cvtsi128_si64(res);
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crc0 = crc0 ^ *((uint64_t*)next2 - 1);
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crc2 = _mm_crc32_u64(crc2, crc0);
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return crc2;
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}
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// Compute CRC-32C using the Intel hardware instruction.
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extern "C"
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USE_PCLMUL
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uint32_t crc32c_3way(uint32_t crc, const void *buf, size_t len)
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{
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const unsigned char* next = static_cast<const unsigned char*>(buf);
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uint64_t count;
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uint64_t crc0, crc1, crc2;
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crc0 = crc ^ 0xffffffffu;
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if (len >= 8) {
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// if len > 216 then align and use triplets
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if (len > 216) {
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{
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// Work on the bytes (< 8) before the first 8-byte alignment addr starts
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auto align_bytes = (8 - (uintptr_t)next) & 7;
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len -= align_bytes;
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align_to_8(align_bytes, crc0, next);
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}
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// Now work on the remaining blocks
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count = len / 24; // number of triplets
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len %= 24; // bytes remaining
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uint64_t n = count >> 7; // #blocks = first block + full blocks
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uint64_t block_size = count & 127;
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if (block_size == 0) {
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block_size = 128;
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} else {
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n++;
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}
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// points to the first byte of the next block
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const uint64_t* next0 = (uint64_t*)next + block_size;
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const uint64_t* next1 = next0 + block_size;
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const uint64_t* next2 = next1 + block_size;
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crc1 = crc2 = 0;
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// Use Duff's device, a for() loop inside a switch()
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// statement. This needs to execute at least once, round len
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// down to nearest triplet multiple
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switch (block_size) {
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case 128:
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do {
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// jumps here for a full block of len 128
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CRCtriplet(crc, next, -128);
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/* fallthrough */
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case 127:
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// jumps here or below for the first block smaller
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CRCtriplet(crc, next, -127);
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/* fallthrough */
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case 126:
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CRCtriplet(crc, next, -126); // than 128
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/* fallthrough */
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case 125:
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CRCtriplet(crc, next, -125);
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/* fallthrough */
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case 124:
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CRCtriplet(crc, next, -124);
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/* fallthrough */
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case 123:
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CRCtriplet(crc, next, -123);
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/* fallthrough */
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case 122:
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CRCtriplet(crc, next, -122);
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/* fallthrough */
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case 121:
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CRCtriplet(crc, next, -121);
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/* fallthrough */
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case 120:
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CRCtriplet(crc, next, -120);
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/* fallthrough */
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case 119:
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CRCtriplet(crc, next, -119);
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/* fallthrough */
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case 118:
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CRCtriplet(crc, next, -118);
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/* fallthrough */
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case 117:
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CRCtriplet(crc, next, -117);
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/* fallthrough */
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case 116:
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CRCtriplet(crc, next, -116);
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/* fallthrough */
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case 115:
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CRCtriplet(crc, next, -115);
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/* fallthrough */
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case 114:
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CRCtriplet(crc, next, -114);
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/* fallthrough */
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case 113:
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CRCtriplet(crc, next, -113);
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/* fallthrough */
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case 112:
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CRCtriplet(crc, next, -112);
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/* fallthrough */
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case 111:
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CRCtriplet(crc, next, -111);
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/* fallthrough */
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case 110:
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CRCtriplet(crc, next, -110);
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/* fallthrough */
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case 109:
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CRCtriplet(crc, next, -109);
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/* fallthrough */
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case 108:
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CRCtriplet(crc, next, -108);
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/* fallthrough */
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case 107:
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CRCtriplet(crc, next, -107);
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/* fallthrough */
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case 106:
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CRCtriplet(crc, next, -106);
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/* fallthrough */
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case 105:
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CRCtriplet(crc, next, -105);
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/* fallthrough */
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case 104:
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CRCtriplet(crc, next, -104);
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/* fallthrough */
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case 103:
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CRCtriplet(crc, next, -103);
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/* fallthrough */
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case 102:
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CRCtriplet(crc, next, -102);
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/* fallthrough */
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case 101:
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CRCtriplet(crc, next, -101);
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/* fallthrough */
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case 100:
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CRCtriplet(crc, next, -100);
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/* fallthrough */
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case 99:
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CRCtriplet(crc, next, -99);
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/* fallthrough */
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case 98:
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CRCtriplet(crc, next, -98);
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/* fallthrough */
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case 97:
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CRCtriplet(crc, next, -97);
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/* fallthrough */
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case 96:
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CRCtriplet(crc, next, -96);
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/* fallthrough */
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case 95:
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CRCtriplet(crc, next, -95);
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/* fallthrough */
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case 94:
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CRCtriplet(crc, next, -94);
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/* fallthrough */
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case 93:
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CRCtriplet(crc, next, -93);
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/* fallthrough */
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case 92:
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CRCtriplet(crc, next, -92);
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/* fallthrough */
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case 91:
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CRCtriplet(crc, next, -91);
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/* fallthrough */
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case 90:
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CRCtriplet(crc, next, -90);
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/* fallthrough */
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case 89:
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CRCtriplet(crc, next, -89);
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/* fallthrough */
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case 88:
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CRCtriplet(crc, next, -88);
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/* fallthrough */
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case 87:
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CRCtriplet(crc, next, -87);
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/* fallthrough */
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case 86:
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CRCtriplet(crc, next, -86);
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/* fallthrough */
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case 85:
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CRCtriplet(crc, next, -85);
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/* fallthrough */
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case 84:
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CRCtriplet(crc, next, -84);
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/* fallthrough */
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case 83:
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CRCtriplet(crc, next, -83);
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/* fallthrough */
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case 82:
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CRCtriplet(crc, next, -82);
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/* fallthrough */
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case 81:
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CRCtriplet(crc, next, -81);
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/* fallthrough */
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case 80:
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CRCtriplet(crc, next, -80);
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/* fallthrough */
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case 79:
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CRCtriplet(crc, next, -79);
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/* fallthrough */
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case 78:
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CRCtriplet(crc, next, -78);
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/* fallthrough */
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case 77:
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CRCtriplet(crc, next, -77);
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/* fallthrough */
|
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case 76:
|
|
CRCtriplet(crc, next, -76);
|
|
/* fallthrough */
|
|
case 75:
|
|
CRCtriplet(crc, next, -75);
|
|
/* fallthrough */
|
|
case 74:
|
|
CRCtriplet(crc, next, -74);
|
|
/* fallthrough */
|
|
case 73:
|
|
CRCtriplet(crc, next, -73);
|
|
/* fallthrough */
|
|
case 72:
|
|
CRCtriplet(crc, next, -72);
|
|
/* fallthrough */
|
|
case 71:
|
|
CRCtriplet(crc, next, -71);
|
|
/* fallthrough */
|
|
case 70:
|
|
CRCtriplet(crc, next, -70);
|
|
/* fallthrough */
|
|
case 69:
|
|
CRCtriplet(crc, next, -69);
|
|
/* fallthrough */
|
|
case 68:
|
|
CRCtriplet(crc, next, -68);
|
|
/* fallthrough */
|
|
case 67:
|
|
CRCtriplet(crc, next, -67);
|
|
/* fallthrough */
|
|
case 66:
|
|
CRCtriplet(crc, next, -66);
|
|
/* fallthrough */
|
|
case 65:
|
|
CRCtriplet(crc, next, -65);
|
|
/* fallthrough */
|
|
case 64:
|
|
CRCtriplet(crc, next, -64);
|
|
/* fallthrough */
|
|
case 63:
|
|
CRCtriplet(crc, next, -63);
|
|
/* fallthrough */
|
|
case 62:
|
|
CRCtriplet(crc, next, -62);
|
|
/* fallthrough */
|
|
case 61:
|
|
CRCtriplet(crc, next, -61);
|
|
/* fallthrough */
|
|
case 60:
|
|
CRCtriplet(crc, next, -60);
|
|
/* fallthrough */
|
|
case 59:
|
|
CRCtriplet(crc, next, -59);
|
|
/* fallthrough */
|
|
case 58:
|
|
CRCtriplet(crc, next, -58);
|
|
/* fallthrough */
|
|
case 57:
|
|
CRCtriplet(crc, next, -57);
|
|
/* fallthrough */
|
|
case 56:
|
|
CRCtriplet(crc, next, -56);
|
|
/* fallthrough */
|
|
case 55:
|
|
CRCtriplet(crc, next, -55);
|
|
/* fallthrough */
|
|
case 54:
|
|
CRCtriplet(crc, next, -54);
|
|
/* fallthrough */
|
|
case 53:
|
|
CRCtriplet(crc, next, -53);
|
|
/* fallthrough */
|
|
case 52:
|
|
CRCtriplet(crc, next, -52);
|
|
/* fallthrough */
|
|
case 51:
|
|
CRCtriplet(crc, next, -51);
|
|
/* fallthrough */
|
|
case 50:
|
|
CRCtriplet(crc, next, -50);
|
|
/* fallthrough */
|
|
case 49:
|
|
CRCtriplet(crc, next, -49);
|
|
/* fallthrough */
|
|
case 48:
|
|
CRCtriplet(crc, next, -48);
|
|
/* fallthrough */
|
|
case 47:
|
|
CRCtriplet(crc, next, -47);
|
|
/* fallthrough */
|
|
case 46:
|
|
CRCtriplet(crc, next, -46);
|
|
/* fallthrough */
|
|
case 45:
|
|
CRCtriplet(crc, next, -45);
|
|
/* fallthrough */
|
|
case 44:
|
|
CRCtriplet(crc, next, -44);
|
|
/* fallthrough */
|
|
case 43:
|
|
CRCtriplet(crc, next, -43);
|
|
/* fallthrough */
|
|
case 42:
|
|
CRCtriplet(crc, next, -42);
|
|
/* fallthrough */
|
|
case 41:
|
|
CRCtriplet(crc, next, -41);
|
|
/* fallthrough */
|
|
case 40:
|
|
CRCtriplet(crc, next, -40);
|
|
/* fallthrough */
|
|
case 39:
|
|
CRCtriplet(crc, next, -39);
|
|
/* fallthrough */
|
|
case 38:
|
|
CRCtriplet(crc, next, -38);
|
|
/* fallthrough */
|
|
case 37:
|
|
CRCtriplet(crc, next, -37);
|
|
/* fallthrough */
|
|
case 36:
|
|
CRCtriplet(crc, next, -36);
|
|
/* fallthrough */
|
|
case 35:
|
|
CRCtriplet(crc, next, -35);
|
|
/* fallthrough */
|
|
case 34:
|
|
CRCtriplet(crc, next, -34);
|
|
/* fallthrough */
|
|
case 33:
|
|
CRCtriplet(crc, next, -33);
|
|
/* fallthrough */
|
|
case 32:
|
|
CRCtriplet(crc, next, -32);
|
|
/* fallthrough */
|
|
case 31:
|
|
CRCtriplet(crc, next, -31);
|
|
/* fallthrough */
|
|
case 30:
|
|
CRCtriplet(crc, next, -30);
|
|
/* fallthrough */
|
|
case 29:
|
|
CRCtriplet(crc, next, -29);
|
|
/* fallthrough */
|
|
case 28:
|
|
CRCtriplet(crc, next, -28);
|
|
/* fallthrough */
|
|
case 27:
|
|
CRCtriplet(crc, next, -27);
|
|
/* fallthrough */
|
|
case 26:
|
|
CRCtriplet(crc, next, -26);
|
|
/* fallthrough */
|
|
case 25:
|
|
CRCtriplet(crc, next, -25);
|
|
/* fallthrough */
|
|
case 24:
|
|
CRCtriplet(crc, next, -24);
|
|
/* fallthrough */
|
|
case 23:
|
|
CRCtriplet(crc, next, -23);
|
|
/* fallthrough */
|
|
case 22:
|
|
CRCtriplet(crc, next, -22);
|
|
/* fallthrough */
|
|
case 21:
|
|
CRCtriplet(crc, next, -21);
|
|
/* fallthrough */
|
|
case 20:
|
|
CRCtriplet(crc, next, -20);
|
|
/* fallthrough */
|
|
case 19:
|
|
CRCtriplet(crc, next, -19);
|
|
/* fallthrough */
|
|
case 18:
|
|
CRCtriplet(crc, next, -18);
|
|
/* fallthrough */
|
|
case 17:
|
|
CRCtriplet(crc, next, -17);
|
|
/* fallthrough */
|
|
case 16:
|
|
CRCtriplet(crc, next, -16);
|
|
/* fallthrough */
|
|
case 15:
|
|
CRCtriplet(crc, next, -15);
|
|
/* fallthrough */
|
|
case 14:
|
|
CRCtriplet(crc, next, -14);
|
|
/* fallthrough */
|
|
case 13:
|
|
CRCtriplet(crc, next, -13);
|
|
/* fallthrough */
|
|
case 12:
|
|
CRCtriplet(crc, next, -12);
|
|
/* fallthrough */
|
|
case 11:
|
|
CRCtriplet(crc, next, -11);
|
|
/* fallthrough */
|
|
case 10:
|
|
CRCtriplet(crc, next, -10);
|
|
/* fallthrough */
|
|
case 9:
|
|
CRCtriplet(crc, next, -9);
|
|
/* fallthrough */
|
|
case 8:
|
|
CRCtriplet(crc, next, -8);
|
|
/* fallthrough */
|
|
case 7:
|
|
CRCtriplet(crc, next, -7);
|
|
/* fallthrough */
|
|
case 6:
|
|
CRCtriplet(crc, next, -6);
|
|
/* fallthrough */
|
|
case 5:
|
|
CRCtriplet(crc, next, -5);
|
|
/* fallthrough */
|
|
case 4:
|
|
CRCtriplet(crc, next, -4);
|
|
/* fallthrough */
|
|
case 3:
|
|
CRCtriplet(crc, next, -3);
|
|
/* fallthrough */
|
|
case 2:
|
|
CRCtriplet(crc, next, -2);
|
|
/* fallthrough */
|
|
case 1:
|
|
CRCduplet(crc, next, -1); // the final triplet is actually only 2
|
|
//{ CombineCRC(); }
|
|
crc0 = CombineCRC(block_size, crc0, crc1, crc2, next2);
|
|
if (--n > 0) {
|
|
crc1 = crc2 = 0;
|
|
block_size = 128;
|
|
// points to the first byte of the next block
|
|
next0 = next2 + 128;
|
|
next1 = next0 + 128; // from here on all blocks are 128 long
|
|
next2 = next1 + 128;
|
|
}
|
|
/* fallthrough */
|
|
case 0:;
|
|
} while (n > 0);
|
|
}
|
|
next = (const unsigned char*)next2;
|
|
}
|
|
uint64_t count2 = len >> 3; // 216 of less bytes is 27 or less singlets
|
|
len = len & 7;
|
|
next += (count2 * 8);
|
|
switch (count2) {
|
|
case 27:
|
|
CRCsinglet(crc0, next, -27 * 8);
|
|
/* fallthrough */
|
|
case 26:
|
|
CRCsinglet(crc0, next, -26 * 8);
|
|
/* fallthrough */
|
|
case 25:
|
|
CRCsinglet(crc0, next, -25 * 8);
|
|
/* fallthrough */
|
|
case 24:
|
|
CRCsinglet(crc0, next, -24 * 8);
|
|
/* fallthrough */
|
|
case 23:
|
|
CRCsinglet(crc0, next, -23 * 8);
|
|
/* fallthrough */
|
|
case 22:
|
|
CRCsinglet(crc0, next, -22 * 8);
|
|
/* fallthrough */
|
|
case 21:
|
|
CRCsinglet(crc0, next, -21 * 8);
|
|
/* fallthrough */
|
|
case 20:
|
|
CRCsinglet(crc0, next, -20 * 8);
|
|
/* fallthrough */
|
|
case 19:
|
|
CRCsinglet(crc0, next, -19 * 8);
|
|
/* fallthrough */
|
|
case 18:
|
|
CRCsinglet(crc0, next, -18 * 8);
|
|
/* fallthrough */
|
|
case 17:
|
|
CRCsinglet(crc0, next, -17 * 8);
|
|
/* fallthrough */
|
|
case 16:
|
|
CRCsinglet(crc0, next, -16 * 8);
|
|
/* fallthrough */
|
|
case 15:
|
|
CRCsinglet(crc0, next, -15 * 8);
|
|
/* fallthrough */
|
|
case 14:
|
|
CRCsinglet(crc0, next, -14 * 8);
|
|
/* fallthrough */
|
|
case 13:
|
|
CRCsinglet(crc0, next, -13 * 8);
|
|
/* fallthrough */
|
|
case 12:
|
|
CRCsinglet(crc0, next, -12 * 8);
|
|
/* fallthrough */
|
|
case 11:
|
|
CRCsinglet(crc0, next, -11 * 8);
|
|
/* fallthrough */
|
|
case 10:
|
|
CRCsinglet(crc0, next, -10 * 8);
|
|
/* fallthrough */
|
|
case 9:
|
|
CRCsinglet(crc0, next, -9 * 8);
|
|
/* fallthrough */
|
|
case 8:
|
|
CRCsinglet(crc0, next, -8 * 8);
|
|
/* fallthrough */
|
|
case 7:
|
|
CRCsinglet(crc0, next, -7 * 8);
|
|
/* fallthrough */
|
|
case 6:
|
|
CRCsinglet(crc0, next, -6 * 8);
|
|
/* fallthrough */
|
|
case 5:
|
|
CRCsinglet(crc0, next, -5 * 8);
|
|
/* fallthrough */
|
|
case 4:
|
|
CRCsinglet(crc0, next, -4 * 8);
|
|
/* fallthrough */
|
|
case 3:
|
|
CRCsinglet(crc0, next, -3 * 8);
|
|
/* fallthrough */
|
|
case 2:
|
|
CRCsinglet(crc0, next, -2 * 8);
|
|
/* fallthrough */
|
|
case 1:
|
|
CRCsinglet(crc0, next, -1 * 8);
|
|
/* fallthrough */
|
|
case 0:;
|
|
}
|
|
}
|
|
{
|
|
align_to_8(len, crc0, next);
|
|
return (uint32_t)crc0 ^ 0xffffffffu;
|
|
}
|
|
}
|