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#!/usr/bin/env ruby
# Code in this file adapted from the mimemagic gem, released under the MIT License.
# Copyright (c) 2011 Daniel Mendler. Available at https://github.com/mimemagicrb/mimemagic.
require 'nokogiri'
class String
alias inspect_old inspect
def inspect
x = b.inspect_old.gsub(/\\x([0-9a-f]{2})/i) do
'\\%03o' % $1.to_i(16)
end
x =~ /[\\']/ ? x : x.gsub('"', '\'')
end
end
def str2int(s)
return s.to_i(16) if s[0..1].downcase == '0x'
return s.to_i(8) if s[0..0].downcase == '0'
s.to_i(10)
end
def get_matches(parent)
parent.elements.map {|match|
children = get_matches(match)
type = match['type']
value = match['value']
offset = match['offset'] || '0'
offset = offset.split(':').map {|x| x.to_i }
mask = match['mask']
if mask && (!mask.match?(/\A0x(FF|00)*\z/) || type != 'string')
# We only support masks of whole bytes against a string type
next nil
end
offset = offset.size == 2 ? offset[0]..offset[1] : offset[0]
case type
when 'string', 'stringignorecase'
value.gsub!(/\A0x([0-9a-f]+)\z/i) { [$1].pack('H*') }
value.gsub!(/\\(x[\dA-Fa-f]{1,2}|0\d{1,3}|\d{1,3}|.)/) { eval("\"\\#{$1}\"") }
if mask
segments = []
mask.scan(/(?:FF)+/) do
match = $~
match_offset = match.offset(0)
mask_offset = (match_offset[0] - 2) / 2
mask_length = (match_offset[1] - match_offset[0]) / 2
segments << [mask_offset, mask_length]
end
chain = children
segments.reverse_each do |(mask_offset, mask_length)|
masked_value = value[mask_offset, mask_length]
if chain.empty?
chain = [[mask_offset, masked_value]]
else
chain = [[mask_offset, masked_value, chain]]
end
end
next chain[0]
end
when 'big16'
value = str2int(value)
value = ((value >> 8).chr + (value & 0xFF).chr)
when 'big32'
value = str2int(value)
value = (((value >> 24) & 0xFF).chr + ((value >> 16) & 0xFF).chr + ((value >> 8) & 0xFF).chr + (value & 0xFF).chr)
when 'little16'
value = str2int(value)
value = ((value & 0xFF).chr + (value >> 8).chr)
when 'little32'
value = str2int(value)
value = ((value & 0xFF).chr + ((value >> 8) & 0xFF).chr + ((value >> 16) & 0xFF).chr + ((value >> 24) & 0xFF).chr)
when 'host16' # use little endian
value = str2int(value)
value = ((value & 0xFF).chr + (value >> 8).chr)
when 'host32' # use little endian
value = str2int(value)
value = ((value & 0xFF).chr + ((value >> 8) & 0xFF).chr + ((value >> 16) & 0xFF).chr + ((value >> 24) & 0xFF).chr)
when 'byte'
value = str2int(value)
value = value.chr
end
children.empty? ? [offset, value] : [offset, value, children]
}.compact
end
if ARGV.size == 0
puts "Usage: #{$0} path/to/data.xml"
exit 1
end
extensions = {}
types = {}
magics = []
ARGV.each do |path|
file = File.new(path)
doc = Nokogiri::XML(file)
(doc/'mime-info/mime-type').each do |mime|
comments = Hash[*(mime/'_comment').map {|comment| [comment['xml:lang'], comment.inner_text] }.flatten]
type = mime['type']
subclass = (mime/'sub-class-of').map{|x| x['type']}
exts = (mime/'glob').map{|x| x['pattern'] =~ /^\*\.([^\[\]]+)$/ ? $1.downcase : nil }.compact
(mime/'magic').each do |magic|
priority = (magic['priority'] || '50').to_i
matches = get_matches(magic)
magics << [priority, type, matches]
end
if !exts.empty?
exts.each{|x|
extensions[x] = type if !extensions.include?(x)
}
types[type] = [exts,subclass,comments[nil]]
end
end
end
magics = magics.sort_by { |priority, type| [-priority, type] }
common_types = [
"image/jpeg", # .jpg
"image/png", # .png
"image/gif", # .gif
"image/tiff", # .tiff
"image/bmp", # .bmp
"image/vnd.adobe.photoshop", # .psd
"image/webp", # .webp
"image/svg+xml", # .svg
"video/x-msvideo", # .avi
"video/x-ms-wmv", # .wmv
"video/mp4", # .mp4, .m4v
"audio/mp4", # .m4a
"video/quicktime", # .mov
"video/mpeg", # .mpeg
"video/ogg", # .ogv
"video/webm", # .webm
"video/x-matroska", # .mkv
"video/x-flv", # .flv
"audio/mpeg", # .mp3
"audio/x-wav", # .wav
"audio/aac", # .aac
"audio/flac", # .flac
"audio/ogg", # .ogg
"application/pdf", # .pdf
"application/msword", # .doc
"application/vnd.openxmlformats-officedocument.wordprocessingml.document", # .docx
"application/vnd.ms-powerpoint", # .pps
"application/vnd.openxmlformats-officedocument.presentationml.slideshow", # .ppsx
"application/vnd.openxmlformats-officedocument.presentationml.presentation", # .pptx
"application/vnd.ms-excel", # .xls
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", # .xlsx
]
common_magics = common_types.map do |common_type|
magics.find { |_, type, _| type == common_type }
end
magics = (common_magics.compact + magics).uniq
puts "# -*- coding: binary -*-"
puts "# frozen_string_literal: true"
puts "module Marcel"
puts " # @private"
puts " # :nodoc:"
puts " EXTENSIONS = {"
extensions.keys.sort.each do |key|
puts " '#{key}' => '#{extensions[key]}',"
end
puts " }"
puts " # @private"
puts " # :nodoc:"
puts " TYPES = {"
types.keys.sort.each do |key|
exts = types[key][0].join(' ')
parents = types[key][1].sort.join(' ')
comment = types[key][2].inspect
puts " '#{key}' => [%w(#{exts}), %w(#{parents}), #{comment}],"
end
puts " }"
puts " # @private"
puts " # :nodoc:"
puts " MAGIC = ["
magics.each do |priority, type, matches|
puts " ['#{type}', #{matches.inspect}],"
end
puts " ]"
puts "end"
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