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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Rule of this file:
+# 1. key should always be in lower case ascii so we can do case insensitive
+# comparison in the code faster.
+# 2. value should be the _name_ used in the WHATWG Encoding Standard
+# https://encoding.spec.whatwg.org/ (of "UTF-7" for UTF-7).
+#
+# This file contains email-specific labels. Web-relevant labels for
+# encodings are in the Encoding Standard / encoding_rs.
+
+# Added for Solaris ns_langinfo. Unlikely relevant to email.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=77300#c9
+646=windows-1252
+
+# Aliases for ISO-8859-8-I
+# From the original IBM bidi patch.
+iso-8859-8i=ISO-8859-8-I
+
+# ISO 8859 series with underscore for JavaMail
+# compat.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=820767
+iso8859_1=windows-1252
+iso8859_2=ISO-8859-2
+iso8859_3=ISO-8859-3
+iso8859_4=ISO-8859-4
+iso8859_5=ISO-8859-5
+iso8859_6=ISO-8859-6
+iso8859_7=ISO-8859-7
+# Unclear if 8 with underscore was visual or not
+iso8859_9=windows-1254
+# No evidence of 10 occurring with underscore
+# 11 is tis620
+# 12 does not exist
+iso8859_13=ISO-8859-13
+# No evidence of 14 occurring with underscore
+iso8859_15=ISO-8859-15
+# No evidence of 16 occurring with underscore
+
+koi8r=KOI8-R
+
+# Code pages shared by DOS and Windows with ms prefix.
+# Evidence of this pattern in the wild:
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1120813
+# Plausible cause: JavaMail
+# The ms prefix as used by Sun is not relevant to windows-125x series
+ms874=windows-874
+# ms932 was added to the Encoding Standard as one-off Thunderbird request
+# MS936 shows up at https://www.iana.org/assignments/character-sets/character-sets.xhtml
+ms936=GBK
+ms949=EUC-KR
+ms950=Big5
+ms950_hkscs=Big5
+
+# Underscore versions of Unix CJK encodings.
+# No evidence of these in the wild, but these could plausibly
+# occur for the same reason as the above two groups.
+euc_cn=GBK
+euc_kr=EUC-KR
+euc_jp=EUC-JP
+big5_hkscs=Big5
+
+# Code pages shared by DOS and Windows with cp prefix
+# cp125x series are in the Encoding Standard
+# Evidence of the pattern in the wild:
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1511950
+# https://bugzilla.mozilla.org/show_bug.cgi?id=542823
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1217161
+cp874=windows-874
+cp932=Shift_JIS
+# CP936 shows up at https://www.iana.org/assignments/character-sets/character-sets.xhtml
+cp936=GBK
+cp949=EUC-KR
+cp950=Big5
+
+# Aliases for ISO-2022-JP
+# The following are really not aliases ISO-2022-JP, but sharing the same decoder
+# Kept mainly for compat with old Apple Mail.
+iso-2022-jp-2=ISO-2022-JP
+csiso2022jp2=ISO-2022-JP
+# A Google search suggests the variant without hyphens has been used with
+# JavaMail.
+iso2022jp=ISO-2022-JP
+
+# Aliases for Big5
+# Added in patch that generally meant to support emails sent by
+# dtmail on Sun Solaris
+# https://bugzilla.mozilla.org/show_bug.cgi?id=146287
+zh_tw-big5=Big5
+
+# Aliases for EUC-KR
+# Added for Solaris ns_langinfo. Unlikely relevant to email.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=82075
+5601=EUC-KR
+# https://bugzilla.mozilla.org/show_bug.cgi?id=234958
+x-windows-949=EUC-KR
+
+# Aliases for windows-874
+# Added originally for nl_langinfo reasons but could plausibly be sent
+# by JavaMail.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=101295
+tis620=windows-874
+
+# Aliases for IBM866
+# This alias may have been made up by accident and may
+# not be relevant to real-world email.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=77588
+cp-866=IBM866
+
+# Aliases for UTF-7
+utf-7=UTF-7
+# The below 4 aliases were not in Thunderbird 60, and there were
+# no complaints.
+# This alias appears to have been generated by the email part
+# of the Netscape 4.0 suite per http://jkorpela.fi/chars.html
+x-unicode-2-0-utf-7=UTF-7
+# This appears to be just a made-up non-x version of the above
+# (checked in without bug number).
+unicode-2-0-utf-7=UTF-7
+# The two aliases below show up at
+# https://www.iana.org/assignments/character-sets/character-sets.xhtml
+unicode-1-1-utf-7=UTF-7
+csunicode11utf7=UTF-7
+
+# The below aliases were not in Thunderbird 60, and there were
+# no complaints.
+# These aliases show up at
+# https://www.iana.org/assignments/character-sets/character-sets.xhtml
+csunicode=UTF-16BE
+csunicode11=UTF-16BE
+iso-10646-ucs-basic=UTF-16BE
+csunicodeascii=UTF-16BE
+iso-10646-unicode-latin1=UTF-16BE
+csunicodelatin1=UTF-16BE
+iso-10646=UTF-16BE
+iso-10646-j-1=UTF-16BE
+iso-10646-ucs-2=UTF-16BE
+# Netscape aliases checked in without bug number.
+# Possibly meant to be Netscape-private.
+x-iso-10646-ucs-2-be=UTF-16BE
+x-iso-10646-ucs-2-le=UTF-16LE
+
+# Shows up at https://www.iana.org/assignments/character-sets/character-sets.xhtml
+# https://bugzilla.mozilla.org/show_bug.cgi?id=651113
+windows-936=GBK
+
+# Added for Solaris ns_langinfo(). Unlikely to be relevant to email.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=82075
+ansi-1251=windows-1251