258 lines
5.4 KiB
Ruby
258 lines
5.4 KiB
Ruby
require 'mongo/util/byte_buffer'
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class BSON
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EOO = 0 # x
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MAXKEY = -1 # x
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NUMBER = 1 # x t
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STRING = 2 # x t
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OBJECT = 3 # x t
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ARRAY = 4
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BINARY = 5
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UNDEFINED = 6
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OID = 7 # x
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BOOLEAN = 8 # x t
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DATE = 9 # x t
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NULL = 10 # x t
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REGEX = 11
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REF = 12
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CODE = 13
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SYMBOL = 14
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CODE_W_SCOPE = 15
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NUMBER_INT = 16
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def self.serialize_cstr(buf, val)
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buf.put_array(val.to_s.unpack("C*") + [0])
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end
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def initialize
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@private_buf = ByteBuffer.new
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@buf = ByteBuffer.new
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end
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def to_a
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@buf.to_a
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end
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def serialize(obj)
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raise "Document is null" unless obj
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@buf.rewind
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# put in a placeholder for the total size
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@buf.put_int(0)
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obj.each {|k, v|
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type = bson_type(v, k)
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case type
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when STRING, CODE
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serialize_string_element(@buf, k, v, type)
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when NUMBER, NUMBER_INT
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serialize_number_element(@buf, k, v, type)
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when OBJECT
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serialize_object_element(@buf, k, v)
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when OID
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serialize_oid_element(@buf, k, v)
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when BOOLEAN
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serialize_boolean_element(@buf, k, v)
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when DATE
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serialize_date_element(@buf, k, v)
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when NULL
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serialize_null_element(@buf, k)
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else
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raise "Unhandled Type #{type}"
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end
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}
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serialize_eoo_element(@buf)
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@buf.put_int(@buf.size, 0)
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self
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end
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def deserialize(buf)
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@buf = ByteBuffer.new(buf.to_a)
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@buf.rewind
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@buf.get_int # eat message size
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doc = {}
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while @buf.more?
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type = @buf.get
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case type
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when STRING
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key = deserialize_element_name(@buf)
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doc[key] = deserialize_string_data(@buf)
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when NUMBER
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key = deserialize_element_name(@buf)
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doc[key] = deserialize_number_data(@buf)
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when NUMBER_INT
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key = deserialize_element_name(@buf)
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doc[key] = deserialize_number_int_data(@buf)
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when OID
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key = deserialize_element_name(@buf)
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doc[key] = deserialize_oid_data(@buf)
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when OBJECT
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key = deserialize_element_name(@buf)
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doc[key] = deserialize_object_data(@buf)
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when BOOLEAN
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key = deserialize_element_name(@buf)
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doc[key] = deserialize_boolean_data(@buf)
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when DATE
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key = deserialize_element_name(@buf)
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doc[key] = deserialize_date_data(@buf)
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when NULL
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key = deserialize_element_name(@buf)
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doc[key] = nil
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when EOO
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break
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else
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raise "Unknown type #{type}, key = #{key}"
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end
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end
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@buf.rewind
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doc
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end
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def hex_dump
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str = ''
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@buf.to_a.each_with_index { |b,i|
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if (i % 8) == 0
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str << "\n" if i > 0
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str << '%4d: ' % i
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else
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str << ' '
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end
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str << '%02X' % b
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}
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str
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end
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def deserialize_date_data(buf)
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Time.at(buf.get_long)
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end
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def deserialize_boolean_data(buf)
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buf.get == 1
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end
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def deserialize_number_data(buf)
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buf.get_double
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end
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def deserialize_number_int_data(buf)
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buf.get_int
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end
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def deserialize_object_data(buf)
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size = buf.get_int
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buf.position -= 4
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BSON.new.deserialize(buf.get(size))
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end
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def deserialize_string_data(buf)
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len = buf.get_int
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bytes = buf.get(len)
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bytes[0..-2].pack("C*")
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end
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def deserialize_oid_data
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ObjectID.new(buf.get(12).pack("C*"))
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end
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def serialize_eoo_element(buf)
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buf.put(EOO)
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end
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def serialize_null_element(buf, key)
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buf.put(NULL)
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self.class.serialize_cstr(buf, key)
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end
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def serialize_boolean_element(buf, key, val)
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buf.put(BOOLEAN)
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self.class.serialize_cstr(buf, key)
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buf.put(val ? 1 : 0)
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end
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def serialize_date_element(buf, key, val)
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buf.put(DATE)
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self.class.serialize_cstr(buf, key)
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buf.put_long(val.to_i)
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end
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def serialize_number_element(buf, key, val, type)
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buf.put(type)
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self.class.serialize_cstr(buf, key)
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if type == NUMBER
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buf.put_double(val)
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else
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buf.put_int(val)
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end
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end
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def serialize_object_element(buf, key, val)
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buf.put(OBJECT)
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self.class.serialize_cstr(buf, key)
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BSON.new(buf).serialize(val)
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end
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def serialize_oid_element(buf, key, val)
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buf.put(OID)
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self.class.serialize_cstr(buf, key)
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buf.put_array(val.to_a)
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end
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def serialize_string_element(buf, key, val, type)
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buf.put(type)
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self.class.serialize_cstr(buf, key)
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# Make a hole for the length
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len_pos = buf.position
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buf.put_int(0)
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# Save the string
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start_pos = buf.position
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self.class.serialize_cstr(buf, val)
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end_pos = buf.position
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# Put the string size in front
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buf.put_int(end_pos - start_pos - 1, len_pos)
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# Go back to where we were
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buf.position = end_pos
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end
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def deserialize_element_name(buf)
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chars = ""
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while 1
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b = buf.get
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break if b == 0
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chars << b.chr
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end
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chars
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end
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def bson_type(o, key)
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case o
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when nil
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NULL
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when Integer
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NUMBER_INT
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when Numeric
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NUMBER
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when String
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# magic awful stuff - the DB requires that a where clause is sent as CODE
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key == "$where" ? CODE : STRING
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when Array
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ARRAY
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when ObjectID
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OID
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when true, false
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Boolean
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when Time
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DATE
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when Hash
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OBJECT
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else
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raise "Unknown type of object: #{o.class.name}"
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end
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end
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end
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