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cl-qprinttextemail

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This small library implements a Quoted-Printable encoding algorithm suitable to use in multipart emails.

In this example, we'll encode a string into the quoted-printable and then back into the Lisp string. CL-QPrint encodes bytes. That is why I'm using babel here:

POFTHEDAY> (babel:string-to-octets
            "Hello World! Привет Мир!")
#(72 101 108 108 111 32 87 111 114 108 100 33
  32 208 159 209 128 208 184 208 178 208 181
  209 130 32 208 156 208 184 209 128 33)

POFTHEDAY> (cl-qprint:encode *)
"Hello=20World!=20=D0=9F=D1=80=D0=B8=D0=B2=D0=B5=D1=82=20=D0=9C=D0=B8=D1=80!"

;; Now we can transfer this text through the wire
;; and to decode it on other end:

POFTHEDAY> (cl-qprint:decode *)
#(72 101 108 108 111 32 87 111 114 108 100 33
  32 208 159 209 128 208 184 208 178 208 181
  209 130 32 208 156 208 184 209 128 33)

POFTHEDAY> (babel:octets-to-string *)
"Hello World! Привет Мир!"

This encoding can be used in multipart emails instead of base64.

It is especially useful for texts, containing a large amount of ASCII symbols. This could be source codes where some comments use international symbols.