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RE: CDATA Section [binary data in...]

• From: "Gordon, Simon" <Simon.Gordon@s...>
• To: XML-Dev Mailing list <xml-dev@i...>
• Date: Fri, 29 Oct 1999 14:23:32 -0600

I found it at : http://www.normos.org/ietf/rfc/rfc2045.txt . Check out pages
23 - 25

Basically the encoder works like this:
Base64Table[] = "ABC...abc...1234567890+/"
ForEach 24 bits in input stream
    ForEach 6 bits in 24 bits
        OutputChar Base64Table[6 bit value]
    NextFor 6 bits
NextFor 24 bits

There are special cases when the input stream is not a multiple of 24 bits
long (the decoder has to know when to stop so the encoder outputs one or two
pad characters "=").

The decoder takes the input stream and outputs the corresponding 6 bit
values. When it encounters an equals, it commits what bits it has left into
a byte, clears the other bits, outputs the resulting byte and stops.

Regards,

Simon Gordon

-----Original Message-----
From: Simon St.Laurent [mailto:simonstl@s...]
Sent: Friday, October 29, 1999 13:22
To: XML-Dev Mailing list
Subject: RE: CDATA Section [binary data in...]


At 02:40 PM 10/29/99 -0400, Dan Vint wrote:
>I've seen reference to base64 many times now, where can I find a spec for
this?

Base64 is described in section 6.8 of RFC 2045, normally available at
http://www.ietf.org/rfc/rfc2045.txt. (I can't get the URL to open today,
though.)


Simon St.Laurent
XML: A Primer, 2nd Ed.
Building XML Applications
Inside XML DTDs: Scientific and Technical
Sharing Bandwidth / Cookies
http://www.simonstl.com

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