Current File : //home/rs/ruby/1.8/lib/ruby/gems/1.8/gems/ruby-mysql-2.9.14/lib/mysql/packet.rb
# coding: ascii-8bit
class Mysql
class Packet
# convert Numeric to LengthCodedBinary
def self.lcb(num)
return "\xfb" if num.nil?
return [num].pack("C") if num < 251
return [252, num].pack("Cv") if num < 65536
return [253, num&0xffff, num>>16].pack("CvC") if num < 16777216
return [254, num&0xffffffff, num>>32].pack("CVV")
end
# convert String to LengthCodedString
def self.lcs(str)
str = Charset.to_binary str.dup
lcb(str.length)+str
end
def initialize(data)
@data = data
end
def lcb
return nil if @data.empty?
case v = utiny
when 0xfb
return nil
when 0xfc
return ushort
when 0xfd
c, v = utiny, ushort
return (v << 8)+c
when 0xfe
v1, v2 = ulong, ulong
return (v2 << 32)+v1
else
return v
end
end
def lcs
len = self.lcb
return nil unless len
@data.slice!(0, len)
end
def read(len)
@data.slice!(0, len)
end
def string
str = @data.unpack('Z*').first
@data.slice!(0, str.length+1)
str
end
def utiny
@data.slice!(0, 1).unpack('C').first
end
def ushort
@data.slice!(0, 2).unpack('v').first
end
def ulong
@data.slice!(0, 4).unpack('V').first
end
def eof?
@data[0] == ?\xfe && @data.length == 5
end
def to_s
@data
end
end
end
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