brotli {brotli}

Brotli Compression

Description

Brotli is a compression algorithm optimized for the web, in particular small text documents.

Usage

brotli_compress(buf, quality = 11, window = 22)

brotli_decompress(buf)

Arguments

buf

raw vector with data to compress/decompress

quality

value between 0 and 11

window

log of window size

Details

Brotli decompression is at least as fast as for gzip while significantly improving the compression ratio. The price we pay is that compression is much slower than gzip. Brotli is therefore most effective for serving static content such as fonts and html pages.

For binary (non-text) data, the compression ratio of Brotli usually does not beat bz2 or xz (lzma), however decompression for these algorithms is too slow for browsers in e.g. mobile devices.

References

J. Alakuijala and Z. Szabadka (July 2016). Brotli Compressed Data Format. IETF Internet Draft https://www.rfc-editor.org/rfc/rfc7932.

See Also

memCompress

Examples

# Simple example
myfile <- file.path(R.home(), "COPYING")
x <- readBin(myfile, raw(), file.info(myfile)$size)
y <- brotli_compress(x)
stopifnot(identical(x, brotli_decompress(y)))

# Compare to other algorithms
length(x)
length(brotli_compress(x))
length(memCompress(x, "gzip"))
length(memCompress(x, "bzip2"))
length(memCompress(x, "xz"))