| # Copyright (c) 2011 Konstantin Haase |
| # |
| # Permission is hereby granted, free of charge, to any person obtaining a copy |
| # of this software and associated documentation files (the "Software"), to deal |
| # in the Software without restriction, including without limitation the rights |
| # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| # copies of the Software, and to permit persons to whom the Software is |
| # furnished to do so, subject to the following conditions: |
| # |
| # The above copyright notice and this permission notice shall be included in |
| # all copies or substantial portions of the Software. |
| # |
| # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| # THE SOFTWARE. |
| |
| |
| require 'stringio' |
| |
| module OTNetstring |
| class Error < StandardError; end |
| |
| class << self |
| def parse(io, encoding = 'internal', fallback_encoding = nil) |
| fallback_encoding = io.encoding if io.respond_to? :encoding |
| io = StringIO.new(io) if io.respond_to? :to_str |
| length, byte = "", nil |
| |
| while byte.nil? || byte =~ /\d/ |
| length << byte if byte |
| byte = io.read(1) |
| end |
| |
| if length.size > 9 |
| raise Error, "#{length} is longer than 9 digits" |
| elsif length !~ /\d+/ |
| raise Error, "Expected '#{byte}' to be a digit" |
| end |
| length = Integer(length) |
| |
| case byte |
| when '#' then Integer io.read(length) |
| when ',' then with_encoding io.read(length), encoding, fallback_encoding |
| when '~' then |
| raise Error, "nil has length of 0, #{length} given" unless length == 0 |
| when '!' then io.read(length) == 'true' |
| when '[', '{' |
| array = [] |
| start = io.pos |
| array << parse(io, encoding, fallback_encoding) while io.pos - start < length |
| raise Error, 'Nested element longer than container' if io.pos - start != length |
| byte == "{" ? Hash[*array] : array |
| else |
| raise Error, "Unknown type '#{byte}'" |
| end |
| end |
| |
| def encode(obj, string_sep = ',') |
| case obj |
| when String then with_encoding "#{obj.bytesize}#{string_sep}#{obj}", "binary" |
| when Integer then encode(obj.inspect, '#') |
| when NilClass then "0~" |
| when Array then encode(obj.map { |e| encode(e) }.join, '[') |
| when Hash then encode(obj.map { |a,b| encode(a)+encode(b) }.join, '{') |
| when FalseClass, TrueClass then encode(obj.inspect, '!') |
| else raise Error, 'cannot encode %p' % obj |
| end |
| end |
| |
| private |
| |
| def with_encoding(str, encoding, fallback = nil) |
| return str unless str.respond_to? :encode |
| encoding = Encoding.find encoding if encoding.respond_to? :to_str |
| encoding ||= fallback |
| encoding ? str.encode(encoding) : str |
| rescue EncodingError |
| str.force_encoding(encoding) |
| end |
| end |
| end |