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GZip.jl: A Julia interface for gzip functions in zlib

Documentation

This module provides a wrapper for the gzip related functions of zlib, a free, general-purpose, legally unencumbered, lossless data-compression library. These functions allow the reading and writing of gzip files.

Usage

Typical usage would be something like

using GZip

# Write some text into a compressed .gz file
s = "gzip is part of zlib, a free, general-purpose, " *
    "legally unencumbered, lossless data-compression library"
fh = GZip.open("testfile.gz", "w")
write(fh, s)
close(fh)

# Read back the data
fh = GZip.open("testfile.gz")
s = readline(fh)
close(fh)

Notes

  • This interface is only for gzipped files, not the streaming zlib compression interface. Internally, it depends on/uses the streaming interface, but the gzip related functions are higher level functions pertaining to gzip files only.
  • GZipStream is an implementation of IO and can be used virtually anywhere IO is used.
  • This implementation mimics the IOStream implementation, and should be a drop-in replacement for IOStream, with some caveats:
    • seekend and truncate are not available
    • readuntil is available, but is not very efficient. (But readline works fine.)

In addition to open, gzopen, and gzdopen, the following IO/IOStream functions are supported:

  • close()
  • flush()
  • seek()
  • skip()
  • position()
  • eof()
  • read()
  • readuntil()
  • readline()
  • write()
  • peek()

Due to limitations in zlib, seekend and truncate are not available.

Old Documentation

Old documentation link: https://gzipjl.readthedocs.io/en/latest/