Documentation

Overview

    Package crc64 implements the 64-bit cyclic redundancy check, or CRC-64, checksum. See https://en.wikipedia.org/wiki/Cyclic_redundancy_check for information.

    Index

    Constants

    View Source
    const (
    	// The ISO polynomial, defined in ISO 3309 and used in HDLC.
    	ISO = 0xD800000000000000
    
    	// The ECMA polynomial, defined in ECMA 182.
    	ECMA = 0xC96C5795D7870F42
    )

      Predefined polynomials.

      View Source
      const Size = 8

        The size of a CRC-64 checksum in bytes.

        Variables

        This section is empty.

        Functions

        func Checksum

        func Checksum(data []byte, tab *Table) uint64

          Checksum returns the CRC-64 checksum of data using the polynomial represented by the Table.

          func New

          func New(tab *Table) hash.Hash64

            New creates a new hash.Hash64 computing the CRC-64 checksum using the polynomial represented by the Table. Its Sum method will lay the value out in big-endian byte order. The returned Hash64 also implements encoding.BinaryMarshaler and encoding.BinaryUnmarshaler to marshal and unmarshal the internal state of the hash.

            func Update

            func Update(crc uint64, tab *Table, p []byte) uint64

              Update returns the result of adding the bytes in p to the crc.

              Types

              type Table

              type Table [256]uint64

                Table is a 256-word table representing the polynomial for efficient processing.

                func MakeTable

                func MakeTable(poly uint64) *Table

                  MakeTable returns a Table constructed from the specified polynomial. The contents of this Table must not be modified.

                  Source Files