Class: Excavate::FileMagic

Inherits:
Object
  • Object
show all
Defined in:
lib/excavate/file_magic.rb

Defined Under Namespace

Classes: Signature

Constant Summary collapse

SIGNATURES = 
[
  Signature.new(0,   "MSCF\x00\x00\x00\x00".b, :cab),
  Signature.new(0,   "\xFD7zXZ\x00".b,         :xz),
  Signature.new(0,   "\x1F\x8B".b,             :gzip),
  Signature.new(257, "ustar".b,                :tar),
  Signature.new(0,   "7z\xBC\xAF\x27\x1C".b,   :seven_zip),
  Signature.new(0,   "PK\x03\x04".b,           :zip),
  Signature.new(0,   "\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1".b, :ole),
  Signature.new(0,   "xar!".b,                 :xar),
  Signature.new(0,   "\xED\xAB\xEE\xDB".b,     :rpm),
  Signature.new(0,   "070707".b,               :cpio),
  Signature.new(0,   "070701".b,               :cpio),
  Signature.new(0,   "070702".b,               :cpio),
  Signature.new(0,   "MZ".b,                   :exe),
].freeze
MAX_READ = 
SIGNATURES.map do |signature|
  signature.offset + signature.magic.bytesize
end.max

Class Method Summary collapse

Class Method Details

.detect(path) ⇒ Object 



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# File 'lib/excavate/file_magic.rb', line 29

def self.detect(path)
  detect_bytes(File.read(path, MAX_READ, mode: "rb"))
end

.detect_bytes(data) ⇒ Object 



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# File 'lib/excavate/file_magic.rb', line 33

def self.detect_bytes(data)
  return nil if data.nil? || data.empty?

  matching_signature(data)&.type
end