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名前:がんふぃーるど
肩書:室長
種別:人間・男
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MCP 70-215 Installing, Configurating, and Administering Microsoft Windows 2000 Server
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名前:なうら
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種別:犬・狆・メス
誕生日:2006/7/9
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前回の続きなんですが…お馬鹿なネタごめんなさい!m(_|_)m

まずはRFCの抜粋をどうぞ

3.2.1.  IP-SFS Data Signals

SFS        0     __0      \0      |0
          /||      ||      ||      ||
          / \     / \     / \     / \
           A       B       C       D
IP-SFS    0x00    0x01    0x02    0x03

-----------------------------------------

SFS        0/      0__     0     __0
          ||      ||      ||\     /|
          / \     / \     / \     / \
           E       F       G       H
IP-SFS    0x04    0x05    0x06    0x07
-----------------------------------------
SFS       \0      |0__     0|      0/
          /|       |      /|      /|
          / \     / \     / \     / \
           I       J       K       L
IP-SFS    0x08    0x09    0x0A    0x0B
-----------------------------------------
SFS        0__     0     _\0     __0|
          /|      /|\      |       |
          / \     / \     / \     / \
           M       N       O       P
IP-SFS    0x0C    0x0D    0x0E    0x0F

3.2.2.  IP-SFS Control Signals

SFS      __0/    __0__   __0      \0|
           |       |       |\      |
          / \     / \     / \     / \
           Q       R       S       T
IP-SFS    FST     FEN     SUN     FUN
-----------------------------------------
SFS       \0/     \0__     0/_     0/
           |       |       |       |\
          / \     / \     / \     / \
           U       V       W       X
IP-SFS    ACK     KAL     NAK     RTR
-----------------------------------------
SFS        0__     0__
          /|       |\
          / \     / \
           Y       Z
IP-SFS    RTT    unused
-----------------------------------------
SFS      _\0/_
          /|\
          / \
         Error
IP-SFS   unused

ちなみに、IP-SFSでは一つのフィールドで4bitまで表現することができ、フレームの構成としては

[フレーム開始フラグ][プロトコル][チェックサムタイプ][フレーム数1][フレーム数2]…データペイロード…[CRC][CRC][CRC][CRC][フレーム終了フラグ]

となる。フレーム開始フラグはFST、フレーム終了フラグがFENである。

 

では、早速仮面ライダーの返信ポーズを解析してみよう。

 

仮面ライダー1号
  0__      0/     __0       \0     _\0/_    \0/
  |\  ->   |\  ->   |\  ->  /|  ->  /|\  ->  |
 / \      / \      / \      / \     / \     / \

 

なになに…unused -> NAK -> SUN -> 8 -> Error -> ACK

えーっと、[間違った] -> [フレーム誤り] -> [伝送キャンセル] -> [パニクって8送信] -> [わけ分からなくなってError送信] -> [とりあえずACK]

ということだろうか、フレームの開始と終了がないしめちゃくちゃですね、仮面ライダー1号…というか、最終的にACK送るだけで変身してるし、何かオプションでもあったんだろうか?

 

続いて、仮面ライダー2号
__0       \0       \0|      0_|    _\0/_    \0/
 /|   ->  /|   ->   |   ->  |-  ->  /|\  ->  |
 / \      / \      / \     / \      / \     / \

 

えーっと、7 -> 8 -> FUN -> RFC規約違反 -> Error -> ACK

結局ACKですか。しかも飛ぶ前のポーズは規約違反。

 

仮面ライダー1号と2号の変身ポーズを見てみましたが、どうもACKを送信するだけで変身できちゃうみたいですね(死

分かりやすいやら分かりにくいやら…変身ベルト作ったエンジニアの顔が見てみたいです。

投稿日時 : 2007年4月1日 22:12

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