Sha256: 14b634d974f6d9bd4012f1573873090ad5118502daddcaf1863463abe1e4d013
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Versions: 6
Compression:
Stored size: 1.63 KB
Contents
require 'delegate'
##
# DNSSD::TextRecord is a Hash delegate that can encode its contents for DNSSD.
class DNSSD::TextRecord < DelegateClass(Hash)
##
# Creates a new TextRecord decoding an encoded +text_record+ if given or
# from a given Hash.
#
# DNSSD::TextRecord.new "\003k=v"
#
# or
#
# DNSSD::TextRecord.new 'k' => 'v'
def initialize(text_record = nil)
super case text_record
when Hash then
text_record.dup
when String then
decode(text_record.dup)
else
Hash.new
end
end
##
# Decodes +text_record+ and returns a Hash
def decode(text_record)
record = {}
tr = text_record.unpack 'C*'
until tr.empty? do
size = tr.shift
next if size.zero?
raise ArgumentError, 'ran out of data in text record' if tr.length < size
entry = tr.shift(size).pack('C*')
raise ArgumentError, 'key not found' unless entry =~ /^[^=]/
key, value = entry.split '=', 2
next unless key
record[key] = value
end
record
end
##
# Encodes this TextRecord. A key value pair must be less than 255 bytes in
# length. Keys longer than 14 bytes may not be compatible with all
# clients.
def encode
sort.map do |key, value|
key = key.to_s
raise DNSSD::Error, "empty key" if key.empty?
raise DNSSD::Error, "key '#{key}' contains =" if key =~ /=/
record = value ? [key, value.to_s].join('=') : key
raise DNSSD::Error, "key value pair at '#{key}' too large to encode" if
record.length > 255
"#{record.length.chr}#{record}"
end.join ''
end
end
Version data entries
6 entries across 6 versions & 1 rubygems