text: # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  # SPDX-License-Identifier: Apache-2.0.
  
  import _awscrt
  
  
  def crc32(input: bytes, previous_crc32: int = 0) -> int:
      """
      Perform a CRC32 (Ethernet, gzip) computation.
  
      If continuing to update a running CRC, pass its value into `previous_crc32`.
      Returns an unsigned 32-bit integer.
      """
      return _awscrt.checksums_crc32(input, previous_crc32)
  
  
  def crc32c(input: bytes, previous_crc32c: int = 0) -> int:
      """
      Perform a Castagnoli CRC32c (iSCSI) computation.
      If continuing to update a running CRC, pass its value into `previous_crc32c`.
      Returns an unsigned 32-bit integer.
      """
      return _awscrt.checksums_crc32c(input, previous_crc32c)
  