MessagePackの整数型のバリエーションとC#でそれに対応する型

MsgPack型	C#型 (class)	範囲	プレフィクス
positive fixnum (7bit)	sbyte (SByte)	0 〜 127	0xxxxxxx
negative fixnum (5bit)	sbyte (SByte)	-32 〜 -1	111yyyyy
uint 8bit	byte (Byte)	0 〜 255	0xcc
uint 16bit	ushort (UInt16)	0 〜 65,535	0xcd
uint 32bit	uint (UInt32)	0 〜 4,294,967,295	0xce
uint 64bit	ulong (UInt64)	0 〜 18,446,744,073,709,551,615	0xcf
int 8bit	sbyte (SByte)	-128 〜 127	0xd0
int 16bit	short (Int16)	-32,768 〜 32,767	0xd1
int 32bit	int (Int32)	−2,147,483,648 〜 2,147,483,647	0xd2
int 64bit	long (Int64)	-9,223,372,036,854,775,808 〜 9,223,372,036,854,775,807	0xd3

• msgpack/spec.md at master · msgpack/msgpack
• 整数型の一覧表 (C# リファレンス)

Rubyでの検証コード（参考）

msgpk_spec.rb

require 'msgpack'

numbers = [
  0,
  127,
  128,
  255,
  256,
  65535,
  65536,
  4294967295,
  4294967296,
  18446744073709551615,
  -1,
  -32,
  -33,
  -128,
  -129,
  -32768,
  -32769,
  -2147483648,
  -2147483649,
  -9223372036854775808
]

numbers.each do |num|
  puts "#{num} => #{MessagePack.dump(num).unpack('H*')}"
end

実行結果

0 => ["00"]
127 => ["f7"]
128 => ["cc08"]
255 => ["ccff"]
256 => ["dc1000"]
65535 => ["dcffff"]
65536 => ["ec00100000"]
4294967295 => ["ecffffffff"]
4294967296 => ["fc0000001000000000"]
18446744073709551615 => ["fcffffffffffffffff"]
-1 => ["ff"]
-32 => ["0e"]
-33 => ["0dfd"]
-128 => ["0d08"]
-129 => ["1dfff7"]
-32768 => ["1d0800"]
-32769 => ["2dfffff7ff"]
-2147483648 => ["2d08000000"]
-2147483649 => ["3dfffffffff7ffffff"]
-9223372036854775808 => ["3d0800000000000000"]