Module: KRPC::ProtobufUtils::Encoder

Defined in:
lib/krpc/protobuf_utils.rb

Class Method Summary collapse

Class Method Details

.encode(value, type) ⇒ Object

Raises:

  • (RuntimeError) 


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# File 'lib/krpc/protobuf_utils.rb', line 74

def encode(value, type)
  meth_name = "encode_" + type
  raise(RuntimeError, "Unsupported type #{type}") unless respond_to?(meth_name)
  send(meth_name, value)
end

.encode_bool(value) ⇒ Object 



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# File 'lib/krpc/protobuf_utils.rb', line 114

def encode_bool(value)
  encode_varint(value ? 1 : 0)
end

.encode_bytes(value) ⇒ Object 



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# File 'lib/krpc/protobuf_utils.rb', line 121

def encode_bytes(value)
  size = encode_varint(value.size)
  size + value.map(&:chr).join.b
end

.encode_double(value) ⇒ Object 



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# File 'lib/krpc/protobuf_utils.rb', line 111

def encode_double(value)
  [value].pack('E')
end

.encode_float(value) ⇒ Object 



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# File 'lib/krpc/protobuf_utils.rb', line 108

def encode_float(value)
  [value].pack('e')
end

.encode_nonnegative_varint(value) ⇒ Object Also known as: encode_uint32, encode_uint64

Raises:

  • (RangeError) 


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# File 'lib/krpc/protobuf_utils.rb', line 98

def encode_nonnegative_varint(value)
  raise(RangeError, "Value must be non-negative, got #{value}") if value < 0
  encode_varint(value)
end

.encode_signed_varint(value) ⇒ Object Also known as: encode_int32, encode_int64 



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# File 'lib/krpc/protobuf_utils.rb', line 94

def encode_signed_varint(value)
  value += (1 << 64) if value < 0
  encode_varint(value)
end

.encode_string(value) ⇒ Object 



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# File 'lib/krpc/protobuf_utils.rb', line 117

def encode_string(value)
  size = encode_varint(value.bytesize)
  size + value.bytes.map(&:chr).join.b
end

.encode_varint(value) ⇒ Object

based on: www.rubydoc.info/gems/ruby-protocol-buffers/1.0.1/ProtocolBuffers/Varint#decode-class_method & github.com/google/protobuf/blob/master/python/google/protobuf/internal/encoder.py#L390



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# File 'lib/krpc/protobuf_utils.rb', line 81

def encode_varint(value)
  return [value].pack('C') if value < 0b1000_0000
  result = ""
  loop do
    byte = value & 0b0111_1111
    value >>= 7
    if value == 0
      return result << byte.chr
    else
      result << (byte | 0b1000_0000).chr
    end
  end
end