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https://github.com/blackwinter/ruby-filemagic

Ruby bindings to the magic(4) library, revised.
https://github.com/blackwinter/ruby-filemagic

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Ruby bindings to the magic(4) library, revised.

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README

          

= FileMagic Library Binding

== VERSION

This documentation refers to filemagic version 0.7.3

== DESCRIPTION

FileMagic extension module. See also libmagic(3), file(1) and magic(4).

=== Constants

MAGIC_NONE:: No flags
MAGIC_DEBUG:: Turn on debugging
MAGIC_SYMLINK:: Follow symlinks
MAGIC_COMPRESS:: Check inside compressed files
MAGIC_DEVICES:: Look at the contents of devices
MAGIC_MIME:: Return a mime string
MAGIC_CONTINUE:: Return all matches, not just the first
MAGIC_CHECK:: Print warnings to stderr

=== Methods

file(filename):: Returns a textual description of the contents
of the filename argument
buffer(string):: Returns a textual description of the contents
of the string argument
check(filename):: Checks the validity of entries in the database
file passed in as filename
compile(filename):: Compiles the database file passed in as filename
load(filename):: Loads the database file passed in as filename
close():: Closes the magic database and frees any memory
allocated

=== Synopsis

require 'filemagic'

p FileMagic::VERSION
# => "0.7.3"
p FileMagic::MAGIC_VERSION
# => "5.39"

p FileMagic.new.flags
# => []

FileMagic.open(:mime) { |fm|
p fm.flags
# => [:mime_type, :mime_encoding]
p fm.file(__FILE__)
# => "text/plain; charset=us-ascii"
p fm.file(__FILE__, true)
# => "text/plain"

fm.flags = [:raw, :continue]
p fm.flags
# => [:continue, :raw]
}

fm = FileMagic.new
p fm.flags
# => []

mime = FileMagic.mime
p mime.flags
# => [:mime_type, :mime_encoding]

=== Environment

The environment variable +MAGIC+ can be used to set the default magic file name.

=== Installation

Install the gem:

sudo gem install ruby-filemagic

The file(1) library and headers are required:

Debian/Ubuntu:: +libmagic-dev+
Fedora/SuSE:: +file-devel+
Alpine:: libmagic file file-dev
Gentoo:: +sys-libs/libmagic+
OS X:: brew install libmagic

=== Build native extension

rake docker:gem:native

Requires Docker[https://docker.com] to be installed.

== LINKS

Homepage:: https://www.darwinsys.com/file/
Documentation:: https://blackwinter.github.io/ruby-filemagic
Source code:: https://github.com/blackwinter/ruby-filemagic
RubyGem:: https://rubygems.org/gems/ruby-filemagic
Travis CI:: https://travis-ci.org/blackwinter/ruby-filemagic

== AUTHORS

* Travis Whitton (Original author)
* Jens Wille

== CREDITS

* Martin Carpenter for Ruby 1.9.2 compatibility
and other improvements.

* Pavel Lobashov (@ShockwaveNN) for Dockerfile to build cross-compiled Windows
extension (pull request #26).

== COPYING

The filemagic extension library is copywrited free software by Travis Whitton
. You can redistribute it under the terms specified in
the COPYING file of the Ruby distribution.

== WARRANTY

THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
PURPOSE.