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# frozen_string_literal: true
module Zip
class ExtraField < Hash # :nodoc:all
ID_MAP = {}
def initialize(binstr = nil, local: false)
merge(binstr, local: local) if binstr
end
def extra_field_type_exist(binstr, id, len, index)
field_name = ID_MAP[id].name
if member?(field_name)
self[field_name].merge(binstr[index, len + 4])
else
field_obj = ID_MAP[id].new(binstr[index, len + 4])
self[field_name] = field_obj
end
end
def extra_field_type_unknown(binstr, len, index, local)
self[:unknown] ||= Unknown.new
if !len || len + 4 > binstr[index..].bytesize
self[:unknown].merge(binstr[index..], local: local)
return
end
self[:unknown].merge(binstr[index, len + 4], local: local)
end
def merge(binstr, local: false)
return if binstr.empty?
i = 0
while i < binstr.bytesize
id = binstr[i, 2]
len = binstr[i + 2, 2].to_s.unpack1('v')
if id && ID_MAP.member?(id)
extra_field_type_exist(binstr, id, len, i)
elsif id
break unless extra_field_type_unknown(binstr, len, i, local)
end
i += len + 4
end
end
def create(name)
unless (field_class = ID_MAP.values.find { |k| k.name == name })
raise Error, "Unknown extra field '#{name}'"
end
self[name] = field_class.new
end
# Place Unknown last, so "extra" data that is missing the proper
# signature/size does not prevent known fields from being read back in.
def ordered_values
result = []
each { |k, v| k == :unknown ? result.push(v) : result.unshift(v) }
result
end
# Remove any extra fields that indicate they can be safely suppressed.
def suppress_fields!(fields)
reject! do |k, v|
v.suppress? if fields == true || [*fields].include?(k)
end
end
def to_local_bin
ordered_values.map! { |v| v.to_local_bin.force_encoding('BINARY') }.join
end
alias to_s to_local_bin
def to_c_dir_bin
ordered_values.map! { |v| v.to_c_dir_bin.force_encoding('BINARY') }.join
end
def c_dir_size
to_c_dir_bin.bytesize
end
def local_size
to_local_bin.bytesize
end
alias length local_size
alias size local_size
end
end
require 'zip/extra_field/unknown'
require 'zip/extra_field/generic'
require 'zip/extra_field/universal_time'
require 'zip/extra_field/old_unix'
require 'zip/extra_field/unix'
require 'zip/extra_field/zip64'
require 'zip/extra_field/ntfs'
require 'zip/extra_field/aes'
# Copyright (C) 2002, 2003 Thomas Sondergaard
# rubyzip is free software; you can redistribute it and/or
# modify it under the terms of the ruby license.
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