Zarr CRC32C codec

The Zarr "CRC32C" codec computes a 32-bit checksum of a raw vector. Upon encoding the codec appends the checksum to the end of the vector. When decoding, the final 4 bytes from the raw vector are extracted and compared to the checksum of the remainder of the raw vector - if the two don't match a warning is generated.

Super classes

zarr::zarr_extension -> zarr::zarr_codec -> zarr_codec_crc32c

Methods

Public methods

• zarr_codec_crc32c$new()

• zarr_codec_crc32c$copy()

• zarr_codec_crc32c$encode()

• zarr_codec_crc32c$decode()

Inherited methods

• zarr::zarr_codec$metadata_fragment()
• zarr::zarr_codec$print()

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Method new()

Create a new "crc32c" codec object.

Usage

zarr_codec_crc32c$new()

Arguments

configuration

Optional. A list with the configuration parameters for this codec but since this codec doesn't have any the argument is always ignored.

Returns

An instance of this class.

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Method copy()

Create a new, independent copy of this codec.

Usage

zarr_codec_crc32c$copy()

Returns

An instance of zarr_codec_crc32c.

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Method encode()

This method computes the CRC32C checksum of a data object and appends it to the data object.

Usage

zarr_codec_crc32c$encode(data)

Arguments

data

A raw vector whose checksum to compute.

Returns

The input data raw vector with the 32-bit checksum appended to it.

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Method decode()

This method extracts the CRC32C checksum from the trailing 32-bits of a data object. It then computes the CRC32C checksum from the data object (less the trailing 32-bits) and compares the two values. If the values differ, a warning will be issued.

Usage

zarr_codec_crc32c$decode(data)

Arguments

data

The raw vector whose checksum to verify.

Returns

The data raw vector with the trailing 32-bits removed.