base64 feature request / enhancement ideas

[Sadi Yumuşak]

I've recently experienced some difficulties in decoding/saving several
inline attachments in an EML (Internet Message Format) file saved from
Thunderbird (same for GMail web client) using the command "base64 --decode
<input> <output>". I've finally managed to do this after some trial and
error, some research, and some additional operations before that command
work. So I thought maybe base64 could be improved so that it could work
without all this additional work. If such features are beyond the scope of
coreutils, which should actually be offered via some other utility using
"base64" (and "dos2unix" as well as others), please forgive this novice.
1. Support CRLF line endings as well as LF.
2. Support for base64-encoded blocks of text with some header lines usually
containing the type and name of the base64-encoded file, and using that
information for the name of the output file.
3. Support decoding a file (such as eml files) containing multiple
base64-encoded blocks of text.
Sadi