Class: AMQ::Protocol::TableValueDecoder

Inherits:
Object
  • Object
show all
Includes:
TypeConstants
Defined in:
lib/amq/protocol/table_value_decoder.rb

Constant Summary

Constants included from TypeConstants

AMQ::Protocol::TypeConstants::BOOLEAN_FALSE, AMQ::Protocol::TypeConstants::BOOLEAN_TRUE, AMQ::Protocol::TypeConstants::TEN, AMQ::Protocol::TypeConstants::TYPE_32BIT_FLOAT, AMQ::Protocol::TypeConstants::TYPE_64BIT_FLOAT, AMQ::Protocol::TypeConstants::TYPE_ARRAY, AMQ::Protocol::TypeConstants::TYPE_BOOLEAN, AMQ::Protocol::TypeConstants::TYPE_BYTE, AMQ::Protocol::TypeConstants::TYPE_BYTE_ARRAY, AMQ::Protocol::TypeConstants::TYPE_DECIMAL, AMQ::Protocol::TypeConstants::TYPE_HASH, AMQ::Protocol::TypeConstants::TYPE_INTEGER, AMQ::Protocol::TypeConstants::TYPE_SIGNED_16BIT, AMQ::Protocol::TypeConstants::TYPE_SIGNED_64BIT, AMQ::Protocol::TypeConstants::TYPE_STRING, AMQ::Protocol::TypeConstants::TYPE_TIME, AMQ::Protocol::TypeConstants::TYPE_VOID

Class Method Summary collapse

Class Method Details

.decode_32bit_float(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 152

def self.decode_32bit_float(data, offset)
  v = data.slice(offset, 4).unpack(PACK_32BIT_FLOAT).first
  offset += 4

  [v, offset]
end

.decode_64bit_float(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 160

def self.decode_64bit_float(data, offset)
  v = data.slice(offset, 8).unpack(PACK_64BIT_FLOAT).first
  offset += 8

  [v, offset]
end

.decode_array(data, initial_offset) ⇒ Object

API



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# File 'lib/amq/protocol/table_value_decoder.rb', line 25

def self.decode_array(data, initial_offset)
  array_length = data.slice(initial_offset, 4).unpack(PACK_UINT32).first

  ary    = Array.new
  offset = initial_offset + 4

  while offset <= (initial_offset + array_length)
    type, offset = decode_value_type(data, offset)

    i = case type
        when TYPE_STRING
          v, offset = decode_string(data, offset)
          v
        when TYPE_BYTE_ARRAY
          # Ruby doesn't have a direct counterpart to
          # ByteBuffer or byte[], so using a string feels
          # more appropriate than an array of fixnums
          v, offset = decode_string(data, offset)
          v
        when TYPE_INTEGER
          v, offset = decode_integer(data, offset)
          v
        when TYPE_DECIMAL
          v, offset = decode_big_decimal(data, offset)
          v
        when TYPE_TIME
          v, offset = decode_time(data, offset)
          v
        when TYPE_HASH
          v, offset = decode_hash(data, offset)
          v
        when TYPE_BOOLEAN
          v, offset = decode_boolean(data, offset)
          v
        when TYPE_BYTE then
          v, offset = decode_byte(data, offset)
          v
        when TYPE_SIGNED_16BIT then
          v, offset = decode_short(data, offset)
          v
        when TYPE_SIGNED_64BIT then
          v, offset = decode_long(data, offset)
          v
        when TYPE_32BIT_FLOAT then
          v, offset = decode_32bit_float(data, offset)
          v
        when TYPE_64BIT_FLOAT then
          v, offset = decode_64bit_float(data, offset)
          v
        when TYPE_VOID
          nil
        when TYPE_ARRAY
          v, offset = TableValueDecoder.decode_array(data, offset)
          v
        else
          raise ArgumentError.new("unsupported type in a table value: #{type.inspect}, do not know how to decode!")
        end

    ary << i
  end


  [ary, initial_offset + array_length + 4]
end

.decode_big_decimal(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 127

def self.decode_big_decimal(data, offset)
  decimals, raw = data.slice(offset, 5).unpack(PACK_UCHAR_UINT32)
  offset += 5
  v = BigDecimal.new(raw.to_s) * (BigDecimal.new(TEN) ** -decimals)

  [v, offset]
end

.decode_boolean(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 145

def self.decode_boolean(data, offset)
  integer = data.slice(offset, 2).unpack(PACK_CHAR).first # 0 or 1
  offset += 1
  [(integer == 1), offset]
end

.decode_byte(data, offset) ⇒ Array

Decodes/Converts a byte value from the data at the provided offset.

Parameters:

  • data (Array) —

    • A big-endian ordered array of bytes.

  • offset (Fixnum) —

    • The offset which bytes the byte is consumed.

Returns:

  • (Array) —

    • The Fixnum value and new offset pair.



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# File 'lib/amq/protocol/table_value_decoder.rb', line 188

def self.decode_byte(data, offset)
  [data.slice(offset, 1).unpack(PACK_CHAR).first, offset += 1]
end

.decode_hash(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 174

def self.decode_hash(data, offset)
  length = data.slice(offset, 4).unpack(PACK_UINT32).first
  v = Table.decode(data.slice(offset, length + 4))
  offset += 4 + length

  [v, offset]
end

.decode_integer(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 101

def self.decode_integer(data, offset)
  v = data.slice(offset, 4).unpack(PACK_UINT32).first
  offset += 4

  [v, offset]
end

.decode_long(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 110

def self.decode_long(data, offset)
  v    = data.slice(offset, 8).unpack(PACK_INT64)

  offset += 8
  [v, offset]
end

.decode_short(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 193

def self.decode_short(data, offset)
  v = AMQ::Hacks.unpack_int16_big_endian(data.slice(offset, 2)).first
  offset += 2
  [v, offset]
end

.decode_string(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 91

def self.decode_string(data, offset)
  length = data.slice(offset, 4).unpack(PACK_UINT32).first
  offset += 4
  v = data.slice(offset, length)
  offset += length

  [v, offset]
end

.decode_time(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 136

def self.decode_time(data, offset)
  timestamp = data.slice(offset, 8).unpack(PACK_UINT32_X2).last
  v = Time.at(timestamp)
  offset += 8

  [v, offset]
end

.decode_value_type(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table_value_decoder.rb', line 168

def self.decode_value_type(data, offset)
  [data.slice(offset, 1), offset + 1]
end