# CRC32c

CRC32c.crc32cFunction
crc32c(data, crc::UInt32=0x00000000)

Compute the CRC-32c checksum of the given data, which can be an Array{UInt8}, a contiguous subarray thereof, or a String. Optionally, you can pass a starting crc integer to be mixed in with the checksum. The crc parameter can be used to compute a checksum on data divided into chunks: performing crc32c(data2, crc32c(data1)) is equivalent to the checksum of [data1; data2]. (Technically, a little-endian checksum is computed.)

There is also a method crc32c(io, nb, crc) to checksum nb bytes from a stream io, or crc32c(io, crc) to checksum all the remaining bytes. Hence you can do open(crc32c, filename) to checksum an entire file, or crc32c(seekstart(buf)) to checksum an IOBuffer without calling take!.

For a String, note that the result is specific to the UTF-8 encoding (a different checksum would be obtained from a different Unicode encoding). To checksum an a::Array of some other bitstype, you can do crc32c(reinterpret(UInt8,a)), but note that the result may be endian-dependent.

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CRC32c.crc32cMethod
crc32c(io::IO, [nb::Integer,] crc::UInt32=0x00000000)

Read up to nb bytes from io and return the CRC-32c checksum, optionally mixed with a starting crc integer. If nb is not supplied, then io will be read until the end of the stream.

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