gh-66788: Add the imap4-utf-7 codec#153149
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Implement the modified UTF-7 encoding used for international IMAP4
mailbox names (RFC 3501, section 5.1.3). It differs from UTF-7:
"&" is the shift character ("&-" encodes a literal "&"), "," replaces
"/" in the Base64 alphabet, and all non-printable-ASCII characters are
Base64-encoded.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Add the
imap4-utf-7codec, implementing the modified UTF-7 encoding used for international IMAP4 mailbox names (RFC 3501, section 5.1.3).It differs from UTF-7 (RFC 2152):
&(not+) is the shift character, and&-encodes a literal&;,is used instead of/in the modified Base64 alphabet;&) are represented directly, so all other characters, including other controls, are Base64-encoded.This is the codec dependency of gh-49555 (international mailbox names in
imaplib). Automatic encoding/decoding of mailbox names inimaplibitself is a separate question, left for later — modern servers accept raw UTF-8 names viaUTF8=ACCEPT(RFC 6855), and auto-conversion has non-trivial API implications.🤖 Generated with Claude Code