gistfile1.txt

require 'java'
require 'msgpack-0.6.0-devel.jar'

##
# Serialize
#

gzout = java.io.ByteArrayOutputStream.new
out = java.util.zip.GZIPOutputStream.new(gzout)

m = org.msgpack.MessagePack.new
pk = m.createPacker(out)

pk.writeArrayBegin(2)
  # 100
  pk.writeInt(100)

  # {"array"=>[1,2,3]}
  pk.writeMapBegin(1)
    pk.writeString("array")
    pk.writeArrayBegin(3)
      pk.writeInt(1)
      pk.writeInt(2)
      pk.writeInt(3)
    pk.writeArrayEnd()
  pk.writeMapEnd()
pk.writeArrayEnd()

# or ...
pk.write [200, "str"]

out.close

bytes = gzout.toByteArray

##
# Deserialize
#

input = java.util.zip.GZIPInputStream.new(java.io.ByteArrayInputStream.new bytes)
m = org.msgpack.MessagePack.new
u = m.createUnpacker(input)

tsv = ''
u.each {|arr|
  tsv << arr.collect {|e|
    if e.is_a?(org.msgpack.type.RawValue)
      e.getString
    else
      e.toString
    end
  }.join("\t") << "\n"
}
puts tsv

# 100   {"array":[1,2,3]}
# 200   str