RFC 1468 (rfc1468) - Page 3 of 6
Japanese Character Encoding for Internet Messages
Alternative Format: Original Text Document
RFC 1468 Japanese Character Encoding for Internet Messages June 1993
double-byte-segment = double-byte-seq 1*( one-of-94 one-of-94 )
single-byte-seq = ESC "(" ( "B" / "J" )
double-byte-seq = ESC "$" ( "@" / "B" )
CRLF = CR LF
; ( Octal, Decimal.)
ESC = ; ( 33, 27.)
SI = ; ( 17, 15.)
SO = ; ( 16, 14.)
CR = ; ( 15, 13.)
LF = ; ( 12, 10.)
one-of-94 = ; (41-176, 33.-126.)
7BIT = ; ( 0-177, 0.-127.)
single-byte-char =
MIME Considerations
The name given to the JUNET character encoding is "ISO-2022-JP". This
name is intended to be used in MIME messages as follows:
Content-Type: text/plain; charset=iso-2022-jp
The ISO-2022-JP encoding is already in 7-bit form, so it is not
necessary to use a Content-Transfer-Encoding header. It should be
noted that applying the Base64 or Quoted-Printable encoding will
render the message unreadable in current JUNET software.
ISO-2022-JP may also be used in MIME Part 2 headers. The "B"
encoding should be used with ISO-2022-JP text.
Background Information
The JUNET encoding was described in the JUNET User's Guide [JUNET]
(JUNET Riyou No Tebiki Dai Ippan).
The encoding is based on the particular usage of ISO 2022 announced
Murai, Crispin & van der Poel