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# encoding: binary
require "amq/protocol/client"
require "amq/protocol/type_constants"
require "amq/protocol/table"
module AMQ
module Protocol
class TableValueDecoder
#
# Behaviors
#
include TypeConstants
#
# API
#
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_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_SIGNED_8BIT then raise NotImplementedError.new
when TYPE_SIGNED_16BIT then raise NotImplementedError.new
when TYPE_SIGNED_64BIT then raise NotImplementedError.new
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: #{type.inspect}")
end
ary << i
end
[ary, initial_offset + array_length + 4]
end # self.decode_array(data, initial_offset)
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 # self.decode_string(data, offset)
def self.decode_integer(data, offset)
v = data.slice(offset, 4).unpack(PACK_UINT32).first
offset += 4
[v, offset]
end # self.decode_integer(data, offset)
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 # self.decode_big_decimal(data, offset)
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 # self.decode_time(data, offset)
def self.decode_boolean(data, offset)
integer = data.slice(offset, 2).unpack(PACK_CHAR).first # 0 or 1
offset += 1
[(integer == 1), offset]
end # self.decode_boolean(data, offset)
def self.decode_32bit_float(data, offset)
v = data.slice(offset, 4).unpack(PACK_32BIT_FLOAT).first
offset += 4
[v, offset]
end # self.decode_32bit_float(data, offset)
def self.decode_64bit_float(data, offset)
v = data.slice(offset, 8).unpack(PACK_64BIT_FLOAT).first
offset += 8
[v, offset]
end # self.decode_64bit_float(data, offset)
def self.decode_value_type(data, offset)
[data.slice(offset, 1), offset + 1]
end # self.decode_value_type(data, offset)
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 # self.decode_hash(data, offset)
end # TableValueDecoder
end # Protocol
end # AMQ
|
