lzCompress: lzCompress In-memory Compression and Decompression
In bwlewis/lz4: "lz4" Data Compression and Decompression

Description Usage Arguments Value Note See Also Examples

View source: R/functions.R

In-memory compression or decompression for raw vectors, cf. memCompress.

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lzCompress(from, level = 0L, type)

lzDecompress(from, type)

`from`	A raw or character vector to be compressed (for `lzCompress`), or a raw vector to be decompressed (for `lzDecompress`). Character vectors will be converted to raw vectors with character strings separated by `"\n"` in the `lzCompress` case.
`level`	An integer between 0 (fast but less compression) and 9 (slow but more compression), inclusive.
`type`	Not used! This dummy argument is present to facilitate drop-in replacement with `memCompress`. We reserve the parameter name for future use however, but right now it is ignored.

A raw vector representing the compressed object.

The functions are compatible with the command-line lz4 format for easy interoparability with other applications. See the examples.

memCompress, memDecompress

x <- head(airquality)
y <- lzCompress(serialize(x, NULL))
z <- unserialize(lzDecompress(y))
all.equal(x, z)

## Not run: 
# Compatibility with the lz4 file format, this example assumes that
# the 'lz4' program is in your system PATH.
# Compress some text in R and save to a file:
compressed_file <- tempfile()
writeBin(lzCompress(capture.output(head(state.x77))), compressed_file)

# Now decompress those data with command-line lz, saving to another file:
decompressed_file <- tempfile()
system2("lz4", args=c("-d", compressed_file, decompressed_file))

# Examine the output:
readLines(decompressed_file, warn=FALSE)

## End(Not run)