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7-bit
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... For example, RFC 821std10(-> 2821prop) restricts mail messages to 7-bit US-ASCII data
with lines no longer than 1000 characters.
...
... It is necessary, therefore, to define a standard mechanism for re-
encoding such data into a 7-bit short-line format. This document
specifies that such encodings will be indicated by a new "Content-
...
... binary data and the desire for a readable
encoding of data that is mostly, but not entirely, 7-bit data. For
this reason, at least two encoding mechanisms are necessary: a
...
... tokens do require such adherence. If the body
contains data in any bit-width other than 7-bit, the appropriate
bit-width Content-Transfer-Encoding ...
... example, many PostScript bodies might consist entirely of short
lines of 7-bit data and hence require little or no encoding.
Other PostScript ...
... 8bit", or "binary" is permitted for
entities of type "multipart". The multipart delimiters and header
fields are always represented as 7-bit ASCII in any case (though the
header fields ...
... bit transport environment, there would be no way to properly encode
them for the 7-bit world, aside from waiting for all of the parts,
reassembling the message, and then encoding the reassembled data in
...
...
transfer-encoding of 7-bit (the default). In particular, even in
environments that support binary or 8-bit transport ...
... message/external-body must always have a content-transfer-encoding of
7-bit (the default). In particular, even in environments that
support binary or 8-bit transport ...
...
Note that since the external bodies are not transported as mail, they
need not conform to the 7-bit and line length requirements, but might
in fact be binary files. Thus a Content-Transfer-Encoding ...
... Coded Character Set--7-Bit American Standard Code for Information Interchange, ANSI X3.4-1986. ...
... International Standard--Information Processing--ISO 7-bit and 8-bit coded character sets--Code extension techniques, ISO ...
... International Standard--Information Processing--ISO 7-bit coded character set for information interchange, ISO 646:1983. ...