IBM864 single-byte transcoding

[jeremy]

• Add support for transcoding IBM864/CP864 as a single-byte encoding
• Include the € euro sign from CCSID 864

[nurse]

Is there people who actually want to use this?

[jeremy]

@nurse Our real-world usage is receiving email in HEY. IBM864 is supported in Ruby but conversion to UTF-8 is not, so emails using this charset (e.g. in a quoted-printable Subject field) can't be parsed by the Mail library.

I saw other single-byte transcodings are easy to add, so I figured adding IBM864 transcoding support to Ruby would be helpful to others who parse email "in the wild."

[nurse]

OK, go ahead!