/**
 * 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 <cstddef>
#include <cstdint>

#include "tmb/internal/crc32.h"

namespace tmb {
namespace internal {

namespace {

static constexpr std::uint32_t kCrcTable[256] {
    0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU,
    0x076dc419U, 0x706af48fU, 0xe963a535U, 0x9e6495a3U,
    0x0edb8832U, 0x79dcb8a4U, 0xe0d5e91eU, 0x97d2d988U,
    0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U, 0x90bf1d91U,
    0x1db71064U, 0x6ab020f2U, 0xf3b97148U, 0x84be41deU,
    0x1adad47dU, 0x6ddde4ebU, 0xf4d4b551U, 0x83d385c7U,
    0x136c9856U, 0x646ba8c0U, 0xfd62f97aU, 0x8a65c9ecU,
    0x14015c4fU, 0x63066cd9U, 0xfa0f3d63U, 0x8d080df5U,
    0x3b6e20c8U, 0x4c69105eU, 0xd56041e4U, 0xa2677172U,
    0x3c03e4d1U, 0x4b04d447U, 0xd20d85fdU, 0xa50ab56bU,
    0x35b5a8faU, 0x42b2986cU, 0xdbbbc9d6U, 0xacbcf940U,
    0x32d86ce3U, 0x45df5c75U, 0xdcd60dcfU, 0xabd13d59U,
    0x26d930acU, 0x51de003aU, 0xc8d75180U, 0xbfd06116U,
    0x21b4f4b5U, 0x56b3c423U, 0xcfba9599U, 0xb8bda50fU,
    0x2802b89eU, 0x5f058808U, 0xc60cd9b2U, 0xb10be924U,
    0x2f6f7c87U, 0x58684c11U, 0xc1611dabU, 0xb6662d3dU,
    0x76dc4190U, 0x01db7106U, 0x98d220bcU, 0xefd5102aU,
    0x71b18589U, 0x06b6b51fU, 0x9fbfe4a5U, 0xe8b8d433U,
    0x7807c9a2U, 0x0f00f934U, 0x9609a88eU, 0xe10e9818U,
    0x7f6a0dbbU, 0x086d3d2dU, 0x91646c97U, 0xe6635c01U,
    0x6b6b51f4U, 0x1c6c6162U, 0x856530d8U, 0xf262004eU,
    0x6c0695edU, 0x1b01a57bU, 0x8208f4c1U, 0xf50fc457U,
    0x65b0d9c6U, 0x12b7e950U, 0x8bbeb8eaU, 0xfcb9887cU,
    0x62dd1ddfU, 0x15da2d49U, 0x8cd37cf3U, 0xfbd44c65U,
    0x4db26158U, 0x3ab551ceU, 0xa3bc0074U, 0xd4bb30e2U,
    0x4adfa541U, 0x3dd895d7U, 0xa4d1c46dU, 0xd3d6f4fbU,
    0x4369e96aU, 0x346ed9fcU, 0xad678846U, 0xda60b8d0U,
    0x44042d73U, 0x33031de5U, 0xaa0a4c5fU, 0xdd0d7cc9U,
    0x5005713cU, 0x270241aaU, 0xbe0b1010U, 0xc90c2086U,
    0x5768b525U, 0x206f85b3U, 0xb966d409U, 0xce61e49fU,
    0x5edef90eU, 0x29d9c998U, 0xb0d09822U, 0xc7d7a8b4U,
    0x59b33d17U, 0x2eb40d81U, 0xb7bd5c3bU, 0xc0ba6cadU,
    0xedb88320U, 0x9abfb3b6U, 0x03b6e20cU, 0x74b1d29aU,
    0xead54739U, 0x9dd277afU, 0x04db2615U, 0x73dc1683U,
    0xe3630b12U, 0x94643b84U, 0x0d6d6a3eU, 0x7a6a5aa8U,
    0xe40ecf0bU, 0x9309ff9dU, 0x0a00ae27U, 0x7d079eb1U,
    0xf00f9344U, 0x8708a3d2U, 0x1e01f268U, 0x6906c2feU,
    0xf762575dU, 0x806567cbU, 0x196c3671U, 0x6e6b06e7U,
    0xfed41b76U, 0x89d32be0U, 0x10da7a5aU, 0x67dd4accU,
    0xf9b9df6fU, 0x8ebeeff9U, 0x17b7be43U, 0x60b08ed5U,
    0xd6d6a3e8U, 0xa1d1937eU, 0x38d8c2c4U, 0x4fdff252U,
    0xd1bb67f1U, 0xa6bc5767U, 0x3fb506ddU, 0x48b2364bU,
    0xd80d2bdaU, 0xaf0a1b4cU, 0x36034af6U, 0x41047a60U,
    0xdf60efc3U, 0xa867df55U, 0x316e8eefU, 0x4669be79U,
    0xcb61b38cU, 0xbc66831aU, 0x256fd2a0U, 0x5268e236U,
    0xcc0c7795U, 0xbb0b4703U, 0x220216b9U, 0x5505262fU,
    0xc5ba3bbeU, 0xb2bd0b28U, 0x2bb45a92U, 0x5cb36a04U,
    0xc2d7ffa7U, 0xb5d0cf31U, 0x2cd99e8bU, 0x5bdeae1dU,
    0x9b64c2b0U, 0xec63f226U, 0x756aa39cU, 0x026d930aU,
    0x9c0906a9U, 0xeb0e363fU, 0x72076785U, 0x05005713U,
    0x95bf4a82U, 0xe2b87a14U, 0x7bb12baeU, 0x0cb61b38U,
    0x92d28e9bU, 0xe5d5be0dU, 0x7cdcefb7U, 0x0bdbdf21U,
    0x86d3d2d4U, 0xf1d4e242U, 0x68ddb3f8U, 0x1fda836eU,
    0x81be16cdU, 0xf6b9265bU, 0x6fb077e1U, 0x18b74777U,
    0x88085ae6U, 0xff0f6a70U, 0x66063bcaU, 0x11010b5cU,
    0x8f659effU, 0xf862ae69U, 0x616bffd3U, 0x166ccf45U,
    0xa00ae278U, 0xd70dd2eeU, 0x4e048354U, 0x3903b3c2U,
    0xa7672661U, 0xd06016f7U, 0x4969474dU, 0x3e6e77dbU,
    0xaed16a4aU, 0xd9d65adcU, 0x40df0b66U, 0x37d83bf0U,
    0xa9bcae53U, 0xdebb9ec5U, 0x47b2cf7fU, 0x30b5ffe9U,
    0xbdbdf21cU, 0xcabac28aU, 0x53b39330U, 0x24b4a3a6U,
    0xbad03605U, 0xcdd70693U, 0x54de5729U, 0x23d967bfU,
    0xb3667a2eU, 0xc4614ab8U, 0x5d681b02U, 0x2a6f2b94U,
    0xb40bbe37U, 0xc30c8ea1U, 0x5a05df1bU, 0x2d02ef8dU
};

}  // namespace

std::uint32_t UpdateCrc32(std::uint32_t crc,
                          const void *data,
                          const std::size_t length) {
  for (std::size_t pos = 0; pos < length; ++pos) {
    crc = kCrcTable[(crc ^ static_cast<const std::uint8_t*>(data)[pos]) & 0xff]
          ^ (crc >> 8);
  }
  return crc;
}

}  // namespace internal
}  // namespace tmb