Class: Zip::ZipExtraField

Inherits:
Hash
  • Object
show all
Defined in:
lib/zip/zip_extra_field.rb

Defined Under Namespace

Classes: Generic, IUnix, UniversalTime

Constant Summary collapse

ID_MAP = 
{}

Instance Method Summary collapse

Constructor Details

#initialize(binstr = nil) ⇒ ZipExtraField

start main of ZipExtraField < Hash



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# File 'lib/zip/zip_extra_field.rb', line 130

def initialize(binstr = nil)
  binstr and merge(binstr)
end

Instance Method Details

#c_dir_length ⇒ Object Also known as: c_dir_size 



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# File 'lib/zip/zip_extra_field.rb', line 198

def c_dir_length
  to_c_dir_bin.bytesize
end

#create(name) ⇒ Object 



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# File 'lib/zip/zip_extra_field.rb', line 167

def create(name)
  field_class = nil
  ID_MAP.each { |id, klass|
    if klass.name == name
      field_class = klass
      break
    end
  }
  if ! field_class
    raise ZipError, "Unknown extra field '#{name}'"
  end
  self[name] = field_class.new()
end

#local_length ⇒ Object Also known as: local_size, length, size 



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# File 'lib/zip/zip_extra_field.rb', line 201

def local_length
  to_local_bin.bytesize
end

#merge(binstr) ⇒ Object 



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# File 'lib/zip/zip_extra_field.rb', line 134

def merge(binstr)
  return if binstr.empty?
  i = 0 
  while i < binstr.bytesize
    id = binstr[i,2]
    len = binstr[i + 2,2].to_s.unpack("v")[0]
    if id && ID_MAP.member?(id)
      field_name = ID_MAP[id].name
      if self.member?(field_name)
        self[field_name].mergea(binstr[i, len + 4])
      else
        field_obj = ID_MAP[id].new(binstr[i, len + 4])
        self[field_name] = field_obj
      end
    elsif id
      unless self["Unknown"]
        s = ""
        class << s
          alias_method :to_c_dir_bin, :to_s
          alias_method :to_local_bin, :to_s
        end
        self["Unknown"] = s
      end
      if !len || len + 4 > binstr[i..-1].bytesize
        self["Unknown"] << binstr[i..-1]
        break
      end
      self["Unknown"] << binstr[i, len + 4]
    end
    i += len + 4
  end
end

#to_c_dir_bin ⇒ Object 



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# File 'lib/zip/zip_extra_field.rb', line 190

def to_c_dir_bin
  s = ""
  each do |k, v|
    s << v.to_c_dir_bin
  end
  s
end

#to_local_bin ⇒ Object Also known as: to_s 



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# File 'lib/zip/zip_extra_field.rb', line 181

def to_local_bin
  s = ""
  each do |k, v|
    s << v.to_local_bin
  end
  s
end