Module: Protobuf::VarintPure

Included in:
Varint
Defined in:
lib/protobuf/varint_pure.rb

Constant Summary collapse

CACHE_LIMIT = 
2048

Instance Method Summary collapse

Instance Method Details

#cached_varint(value) ⇒ Object 



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# File 'lib/protobuf/varint_pure.rb', line 5

def cached_varint(value)
  @_varint_cache ||= {}
  (@_varint_cache[value] ||= encode(value, false)).dup
end

#decode(stream) ⇒ Object 



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# File 'lib/protobuf/varint_pure.rb', line 10

def decode(stream)
  value = index = 0
  begin
    byte = stream.readbyte
    value |= (byte & 0x7f) << (7 * index)
    index += 1
  end while (byte & 0x80).nonzero?
  value
end

#encode(value, use_cache = true) ⇒ Object 



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# File 'lib/protobuf/varint_pure.rb', line 20

def encode(value, use_cache = true)
  return cached_varint(value) if use_cache && value >= 0 && value <= CACHE_LIMIT

  bytes = []
  until value < 128
    bytes << (0x80 | (value & 0x7f))
    value >>= 7
  end
  (bytes << value).pack('C*')
end