arrow/util/crc32.h

0001 // Licensed to the Apache Software Foundation (ASF) under one
0002 // or more contributor license agreements.  See the NOTICE file
0003 // distributed with this work for additional information
0004 // regarding copyright ownership.  The ASF licenses this file
0005 // to you under the Apache License, Version 2.0 (the
0006 // "License"); you may not use this file except in compliance
0007 // with the License.  You may obtain a copy of the License at
0008 //
0009 //   http://www.apache.org/licenses/LICENSE-2.0
0010 //
0011 // Unless required by applicable law or agreed to in writing,
0012 // software distributed under the License is distributed on an
0013 // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
0014 // KIND, either express or implied.  See the License for the
0015 // specific language governing permissions and limitations
0016 // under the License.
0017
0018 #include <cstddef>
0019 #include <cstdint>
0020
0021 #include "arrow/util/visibility.h"
0022
0023 namespace arrow {
0024 namespace internal {
0025
0026 /// \brief Compute the CRC32 checksum of the given data
0027 ///
0028 /// This function computes CRC32 with the polynomial 0x04C11DB7,
0029 /// as used in zlib and others (note this is different from CRC32C).
0030 /// To compute a running CRC32, pass the previous value in `prev`,
0031 /// otherwise `prev` should be 0.
0032 ARROW_EXPORT
0033 uint32_t crc32(uint32_t prev, const void* data, size_t length);
0034
0035 }  // namespace internal
0036 }  // namespace arrow