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Compresses and uncompresses files to and from gz-archives

Source: R/gz_functions.R
gz_functions.Rd

Allows the compression and uncompression of files

Usage

gunzip_file(
  infile,
  outfile = gsub("\\.gz$", "", infile),
  buffer_size = min(4 * file.size(infile), 2e+09)
)

gzip_file(
  infile,
  outfile = NA,
  buffer_size = min(4 * file.size(infile), 2e+09)
)

Arguments

infile

the file to be zipped or unzipped

outfile

the resulting zipped or unzipped file

buffer_size

the size of the buffer to read in at once, default is 4 times the file.size (max 2Gb).

Value

The filename of the unzipped file, invisibly

Details

Functions are

  • gunzip_file: uncompresses a gz-archive to raw binary data

-gzip_file: compresses a raw binary data file to a gz-archive

Examples

gzfile <- system.file("extdata", "ex20101224.TEST_ITCH_50.gz", package = "RITCH")
file   <- system.file("extdata", "ex20101224.TEST_ITCH_50", package = "RITCH")

# uncompress file
(outfile <- gunzip_file(gzfile, "tmp"))
#> [1] "tmp"
file.info(outfile)
#>       size isdir mode               mtime               ctime
#> tmp 465048 FALSE  644 2024-01-15 14:22:14 2024-01-15 14:22:14
#>                   atime  uid gid  uname grname
#> tmp 2024-01-15 14:22:14 1001 127 runner docker
unlink(outfile)

# compress file
(outfile <- gzip_file(file))
#> [1] "ex20101224.TEST_ITCH_50.gz"
file.info(outfile)
#>                              size isdir mode               mtime
#> ex20101224.TEST_ITCH_50.gz 159965 FALSE  644 2024-01-15 14:22:14
#>                                          ctime               atime  uid gid
#> ex20101224.TEST_ITCH_50.gz 2024-01-15 14:22:14 2024-01-15 14:22:14 1001 127
#>                             uname grname
#> ex20101224.TEST_ITCH_50.gz runner docker
unlink(outfile)