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