Zarr blosc codec

The Zarr "blosc" codec offers a number of compression options to reduce the size of a raw vector prior to storing, and uncompressing when reading.

Super classes

zarr::zarr_extension -> zarr::zarr_codec -> zarr_codec_blosc

Active bindings

cname

Set or retrieve the name of the compression algorithm. Must be one of "blosclz", "lz4", "lz4hc", "zstd" or "zlib".

clevel

Set or retrieve the compression level. Must be an integer between 0 (no compression) and 9 (maximum compression).

shuffle

Set or retrieve the data shuffling of the compression algorithm. Must be one of "shuffle", "noshuffle" or "bitshuffle".

typesize

Set or retrieve the size in bytes of the data type being compressed. It is highly recommended to leave this at the automatically determined value.

blocksize

Set or retrieve the size in bytes of the blocks being compressed. It is highly recommended to leave this at a value of 0 such that the blosc library will automatically determine the optimal value.

Methods

Public methods

• zarr_codec_blosc$new()

• zarr_codec_blosc$copy()

• zarr_codec_blosc$encode()

• zarr_codec_blosc$decode()

Inherited methods

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

---

Method new()

Create a new "blosc" codec object. The typesize argument is taken from the data type of the array passed in through the data_type argument and the shuffle argument is chosen based on the data_type.

Usage

zarr_codec_blosc$new(data_type, configuration = NULL)

Arguments

data_type

The zarr_data_type instance of the Zarr array that this codec is used for.

configuration

Optional. A list with the configuration parameters for this codec. If not given, the default compression of "zstd" with level 1 will be used.

Returns

An instance of this class.

---

Method copy()

Create a new, independent copy of this codec.

Usage

zarr_codec_blosc$copy()

Returns

An instance of zarr_codec_blosc.

---

Method encode()

This method compresses a data object using the "blosc" compression library.

Usage

zarr_codec_blosc$encode(data)

Arguments

data

The raw vector to be compressed.

Returns

A raw vector with compressed data.

---

Method decode()

This method decompresses a data object using the "blosc" compression library.

Usage

zarr_codec_blosc$decode(data)

Arguments

data

The raw vector to be decoded.

Returns

A raw vector with the decoded data.