text: /*
   * Copyright (c) 2016, Alliance for Open Media. All rights reserved
   *
   * This source code is subject to the terms of the BSD 2 Clause License and
   * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
   * was not distributed with this source code in the LICENSE file, you can
   * obtain it at www.aomedia.org/license/software. If the Alliance for Open
   * Media Patent License 1.0 was not distributed with this source code in the
   * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
   */
  
  #ifndef AV1_ENCODER_HASH_H_
  #define AV1_ENCODER_HASH_H_
  
  #include "./aom_config.h"
  #include "aom/aom_integer.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  typedef struct _crc_calculator {
    uint32_t remainder;
    uint32_t trunc_poly;
    uint32_t bits;
    uint32_t table[256];
    uint32_t final_result_mask;
  } CRC_CALCULATOR;
  
  // Initialize the crc calculator. It must be executed at least once before
  // calling av1_get_crc_value().
  void av1_crc_calculator_init(CRC_CALCULATOR *p_crc_calculator, uint32_t bits,
                               uint32_t truncPoly);
  uint32_t av1_get_crc_value(void *crc_calculator, uint8_t *p, int length);
  
  // CRC32C: POLY = 0x82f63b78;
  typedef struct _CRC32C {
    /* Table for a quadword-at-a-time software crc. */
    uint32_t table[8][256];
  } CRC32C;
  
  // init table for software version crc32c
  void av1_crc32c_calculator_init(CRC32C *p_crc32c);
  
  #ifdef __cplusplus
  }  // extern "C"
  #endif
  
  #endif  // AV1_ENCODER_HASH_H_
  