| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| #include "ChecksumProvider.h" |
| |
| #include <assert.h> |
| #include "crc32c_sse42.h" |
| #include "crc32c_arm.h" |
| #include "crc32c_sw.h" |
| |
| namespace pulsar { |
| bool isCrc32cSupported = crc32cSupported(); |
| |
| #if defined(HAVE_ARM64_CRC) |
| |
| bool isCrc32ArmSupported = crc32cArmSupported(); |
| |
| bool crc32cArmSupported() { return crc32c_arm64_initialize(); } |
| #endif |
| |
| bool crc32cSupported() { return crc32c_initialize(); } |
| |
| /** |
| * computes crc32c checksum: uses sse4.2 hardware-instruction to compute crc32c if machine supports else it |
| * computes using sw algo |
| * @param |
| * previousChecksum = in case of incremental-checksum-computation pass previous computed else pass 0 in other |
| * case. |
| * data = for which checksum will be computed |
| * length = length of data from offset |
| */ |
| uint32_t computeChecksum(uint32_t previousChecksum, const void* data, int length) { |
| if (isCrc32cSupported) { |
| return crc32cHw(previousChecksum, data, length); |
| } |
| #ifdef HAVE_ARM64_CRYPTO |
| else if (isCrc32ArmSupported) { |
| return crc32cHwArm(previousChecksum, data, length); |
| } |
| #endif |
| else { |
| return crc32cSw(previousChecksum, data, length); |
| } |
| } |
| |
| /** |
| * Computes crc32c using hardware sse4.2 instruction |
| */ |
| uint32_t crc32cHw(uint32_t previousChecksum, const void* data, int length) { |
| assert(isCrc32cSupported); |
| return crc32c(previousChecksum, data, length, 0); |
| } |
| |
| #if defined(HAVE_ARM64_CRC) |
| /** |
| * Computes crc32c using hardware neon instruction |
| */ |
| uint32_t crc32cHwArm(uint32_t previousChecksum, const void* data, int length) { |
| assert(isCrc32ArmSupported); |
| return crc32c_arm64(previousChecksum, data, length); |
| } |
| #else |
| uint32_t crc32cHwArm(uint32_t previousChecksum, const void* data, int length) { |
| return crc32c_sw(previousChecksum, data, length); // fallback to the software implementation |
| } |
| #endif |
| |
| /** |
| * Computes crc32c using sw crc-table algo |
| */ |
| uint32_t crc32cSw(uint32_t previousChecksum, const void* data, int length) { |
| return crc32c_sw(previousChecksum, data, length); |
| } |
| } // namespace pulsar |