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|
# frozen_string_literal: true
begin
::RUBY_VERSION =~ /(\d+\.\d+)/
require_relative "magic/#{Regexp.last_match(1)}/magic"
rescue LoadError
# use "require" instead of "require_relative" because non-native gems will place C extension files
# in Gem::BasicSpecification#extension_dir after compilation (during normal installation), which
# is in $LOAD_PATH but not necessarily relative to this file (see #21 and nokogiri#2300)
require 'magic/magic'
end
require_relative 'magic/version'
require_relative 'magic/core/file'
require_relative 'magic/core/string'
#
# File _Magic_ in Ruby.
#
# Simple interface to _libmagic_ for Ruby Programming Language.
#
class Magic
#
# call-seq:
# magic.inspect -> string
#
# Example:
#
# magic = Magic.new
# magic.inspect #=> "#<Magic:0x007fd5258a1108 @flags=0, @paths=[\"/etc/magic\", \"/usr/share/misc/magic\"]>"
# magic.close
# magic.inspect #=> "#<Magic:0x007fd5258a1108 @flags=0, @paths=[\"/etc/magic\", \"/usr/share/misc/magic\"] (closed)>"
#
def inspect
super.insert(-2, self.closed? ? ' (closed)' : '')
end
#
# call-seq:
# magic.flags_list( boolean ) -> array
#
# See also: Magic#flags and Magic#flags_names
#
def flags_list(names = false)
raise LibraryError, 'Magic library is not open' if closed?
return [names ? 'NONE' : 0] if @flags.zero?
n, i = 0, @flags
flags = []
@@flags_map ||= flags_as_map if names
while i > 0
n = 2 ** (Math.log(i) / Math.log(2)).to_i
i = i - n
flags.insert(0, names ? @@flags_map[n] : n)
end
flags
end
alias_method :flags_to_a, :flags_list
# call-seq:
# magic.flags_names -> array
#
# See also: Magic#flags and Magic#flags_list
#
def flags_names
flags_list(true)
end
class << self
#
# call-seq:
# Magic.open( integer ) -> self
# Magic.open( integer ) {|magic| block } -> string or array
#
# See also: Magic::mime, Magic::type, Magic::encoding, Magic::compile and Magic::check
#
def open(flags = Magic::NONE)
magic = Magic.new
magic.flags = flags
if block_given?
begin
yield magic
ensure
magic.close
end
else
magic
end
end
#
# call-seq:
# Magic.mime -> self
# Magic.mime {|magic| block } -> string or array
#
# See also: Magic::open, Magic::type, Magic::encoding, Magic::compile and Magic::check
#
def mime(&block)
open(Magic::MIME, &block)
end
alias_method :mime_type, :mime
#
# call-seq:
# Magic.type -> self
# Magic.type {|magic| block } -> string or array
#
# See also: Magic::open, Magic::mime, Magic::encoding, Magic::compile and Magic::check
#
def type(&block)
open(Magic::MIME_TYPE, &block)
end
#
# call-seq:
# Magic.encoding -> self
# Magic.encoding {|magic| block } -> string or array
#
# See also: Magic::open, Magic::mime, Magic::type, Magic::compile and Magic::check
#
def encoding(&block)
open(Magic::MIME_ENCODING, &block)
end
#
# call-seq:
# Magic.compile( string, ... ) -> true
# Magic.compile( array ) -> true
#
# See also: Magic::open, Magic::mime, Magic::type, Magic::encoding, and Magic::check
#
def compile(*paths)
open {|m| m.compile(paths) }
end
#
# call-seq:
# Magic.check( string, ... ) -> true or false
# Magic.check( array ) -> true or false
#
# See also: Magic::open, Magic::mime, Magic::type, Magic::encoding and Magic::compile
#
def check(*paths)
open {|m| m.check(paths) }
end
#
# call-seq:
# Magic.file( object ) -> string or array
# Magic.file( string ) -> string or array
# Magic.file( string, integer ) -> string or array
#
# See also:
#
def file(path, flags = Magic::MIME)
open(flags).file(path)
end
#
# call-seq:
# Magic.buffer( string ) -> string or array
# Magic.buffer( string, integer ) -> string or array
#
# See also:
#
def buffer(buffer, flags = Magic::MIME)
open(flags).buffer(buffer)
end
#
# call-seq:
# Magic.descriptor( object ) -> string or array
# Magic.descriptor( integer ) -> string or array
# Magic.descriptor( integer, integer ) -> string or array
#
# See also:
#
def descriptor(fd, flags = Magic::MIME)
open(flags).descriptor(fd)
end
alias_method :fd, :descriptor
private
def default_paths
paths = Dir.glob(File.expand_path(File.join(File.dirname(__FILE__), "../ext/magic/share/*.mgc")))
paths.empty? ? nil : paths
end
end
private
def power_of_two?(number)
number > 0 && Math.log2(number) % 1 == 0
end
def flags_as_map
klass = self.class
klass.constants.each_with_object({}) do |constant, flags|
constant = constant.to_s
next if constant.start_with?('PARAM_')
value = klass.const_get(constant)
if value.is_a?(Integer) && power_of_two?(value)
flags[value] = constant
end
end
end
end
FileMagic = Magic
|
