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Encode::Supported(3)	       User Contributed Perl Documentation	     Encode::Supported(3)

       Encode::Supported -- Encodings supported by Encode

   Encoding Names
       Encoding names are case insensitive. White space in names is ignored.  In addition, an
       encoding may have aliases.  Each encoding has one "canonical" name.  The "canonical" name
       is chosen from the names of the encoding by picking the first in the following sequence
       (with a few exceptions).

       o The name used by the Perl community.  That includes 'utf8' and 'ascii'.  Unlike aliases,
	 canonical names directly reach the method so such frequently used words like 'utf8'
	 don't need to do alias lookups.

       o The MIME name as defined in IETF RFCs.  This includes all "iso-"s.

       o The name in the IANA registry.

       o The name used by the organization that defined it.

       In case de jure canonical names differ from that of the Encode module, they are always
       aliased if it ever be implemented.  So you can safely tell if a given encoding is
       implemented or not just by passing the canonical name.

       Because of all the alias issues, and because in the general case encodings have state,
       "Encode" uses an encoding object internally once an operation is in progress.

Supported Encodings
       As of Perl 5.8.0, at least the following encodings are recognized.  Note that unless
       otherwise specified, they are all case insensitive (via alias) and all occurrence of
       spaces are replaced with '-'.  In other words, "ISO 8859 1" and "iso-8859-1" are

       Encodings are categorized and implemented in several different modules but you don't have
       to "use Encode::XX" to make them available for most cases.  Encode.pm will automatically
       load those modules on demand.

   Built-in Encodings
       The following encodings are always available.

	 Canonical     Aliases			    Comments & References
	 ascii	       US-ascii ISO-646-US			   [ECMA]
	 ascii-ctrl					 Special Encoding
	 iso-8859-1    latin1					    [ISO]
	 null						 Special Encoding
	 utf8	       UTF-8					[RFC2279]

       null and ascii-ctrl are special.  "null" fails for all character so when you set fallback
       mode to PERLQQ, HTMLCREF or XMLCREF, ALL CHARACTERS will fall back to character
       references.  Ditto for "ascii-ctrl" except for control characters.  For fallback modes,
       see Encode.

   Encode::Unicode -- other Unicode encodings
       Unicode coding schemes other than native utf8 are supported by Encode::Unicode, which will
       be autoloaded on demand.

	 UCS-2BE       UCS-2, iso-10646-1		       [IANA, UC]
	 UCS-2LE						     [UC]
	 UTF-16 						     [UC]
	 UTF-16BE						     [UC]
	 UTF-16LE						     [UC]
	 UTF-32 						     [UC]
	 UTF-32BE      UCS-4					     [UC]
	 UTF-32LE						     [UC]
	 UTF-7							[RFC2152]

       To find how (UCS-2|UTF-(16|32))(LE|BE)? differ from one another, see Encode::Unicode.

       UTF-7 is a special encoding which "re-encodes" UTF-16BE into a 7-bit encoding.  It is
       implemented separately by Encode::Unicode::UTF7.

   Encode::Byte -- Extended ASCII
       Encode::Byte implements most single-byte encodings except for Symbols and EBCDIC. The
       following encodings are based on single-byte encodings implemented as extended ASCII.
       Most of them map \x80-\xff (upper half) to non-ASCII characters.

       ISO-8859 and corresponding vendor mappings
	 Since there are so many, they are presented in table format with languages and
	 corresponding encoding names by vendors.  Note that the table is sorted in order of
	 ISO-8859 and the corresponding vendor mappings are slightly different from that of ISO.
	 See <http://czyborra.com/charsets/iso8859.html> for details.

	   Lang/Regions  ISO/Other Std.  DOS	 Windows Macintosh  Others
	   N. America	 (ASCII)	 cp437	      AdobeStandardEncoding
					 cp863 (DOSCanadaF)
	   W. Europe	 iso-8859-1	 cp850	 cp1252  MacRoman  nextstep
					 cp860 (DOSPortuguese)
	   Cntrl. Europe iso-8859-2	 cp852	 cp1250  MacCentralEurRoman
	   Latin3[1]	 iso-8859-3
	   Latin4[2]	 iso-8859-4
	   Cyrillics	 iso-8859-5	 cp855	 cp1251  MacCyrillic
	     (See also next section)	 cp866		 MacUkrainian
	   Arabic	 iso-8859-6	 cp864	 cp1256  MacArabic
					 cp1006 	 MacFarsi
	   Greek	 iso-8859-7	 cp737	 cp1253  MacGreek
					 cp869 (DOSGreek2)
	   Hebrew	 iso-8859-8	 cp862	 cp1255  MacHebrew
	   Turkish	 iso-8859-9	 cp857	 cp1254  MacTurkish
	   Nordics	 iso-8859-10	 cp865
					 cp861		 MacIcelandic
	   Thai 	 iso-8859-11[3]  cp874		 MacThai
	   (iso-8859-12 is nonexistent. Reserved for Indics?)
	   Baltics	 iso-8859-13	 cp775		 cp1257
	   Celtics	 iso-8859-14
	   Latin9 [4]	 iso-8859-15
	   Latin10	 iso-8859-16
	   Vietnamese	 viscii 		 cp1258  MacVietnamese

	   [1] Esperanto, Maltese, and Turkish. Turkish is now on 8859-9.
	   [2] Baltics.  Now on 8859-10, except for Latvian.
	   [3] TIS 620 +  Non-Breaking Space (0xA0 / U+00A0)
	   [4] Nicknamed Latin0; the Euro sign as well as French and Finnish
	       letters that are missing from 8859-1 were added.

	 All cp* are also available as ibm-*, ms-*, and windows-* .  See also

	 Macintosh encodings don't seem to be registered in such entities as IANA.  "Canonical"
	 names in Encode are based upon Apple's Tech Note 1150.  See
	 <http://developer.apple.com/technotes/tn/tn1150.html> for details.

       KOI8 - De Facto Standard for the Cyrillic world
	 Though ISO-8859 does have ISO-8859-5, the KOI8 series is far more popular in the Net.
	 Encode comes with the following KOI charsets.	For gory details, see

	   koi8-r cp878 					  [RFC1489]
	   koi8-u						  [RFC2319]

   gsm0338 - Hentai Latin 1
       GSM0338 is for GSM handsets. Though it shares alphanumerals with ASCII, control character
       ranges and other parts are mapped very differently, mainly to store Greek characters.
       There are also escape sequences (starting with 0x1B) to cover e.g. the Euro sign.

       This was once handled by Encode::Bytes but because of all those unusual specifications,
       Encode 2.20 has relocated the support to Encode::GSM0338. See Encode::GSM0338 for details.

       gsm0338 support before 2.19
	 Some special cases like a trailing 0x00 byte or a lone 0x1B byte are not well-defined
	 and decode() will return an empty string for them.  One possible workaround is

	    $gsm =~ s/\x00\z/\x00\x00/;
	    $uni = decode("gsm0338", $gsm);
	    $uni .= "\xA0" if $gsm =~ /\x1B\z/;

	 Note that the Encode implementation of GSM0338 does not implement the reuse of Latin
	 capital letters as Greek capital letters (for example, the 0x5A is U+005A (LATIN CAPITAL

	 The GSM0338 is also covered in Encode::Byte even though it is not an "extended ASCII"

   CJK: Chinese, Japanese, Korean (Multibyte)
       Note that Vietnamese is listed above.  Also read "Encoding vs Charset" below.  Also note
       that these are implemented in distinct modules by countries, due to the size concerns
       (simplified Chinese is mapped to 'CN', continental China, while traditional Chinese is
       mapped to 'TW', Taiwan).  Please refer to their respective documentation pages.

       Encode::CN -- Continental China
	   Standard	 DOS/Win Macintosh		  Comment/Reference
	   euc-cn [1]		 MacChineseSimp
	   (gbk)	 cp936 [2]
	   gb12345-raw			    { GB12345 without CES }
	   gb2312-raw			    { GB2312  without CES }

	   [1] GB2312 is aliased to this.  See L<Microsoft-related naming mess>
	   [2] gbk is aliased to this.	See L<Microsoft-related naming mess>

       Encode::JP -- Japan
	   Standard	 DOS/Win Macintosh		  Comment/Reference
	   shiftjis	 cp932	 macJapanese
	   iso-2022-jp						  [RFC1468]
	   iso-2022-jp-1					  [RFC2237]
	   jis0201-raw	{ JIS X 0201 (roman + halfwidth kana) without CES }
	   jis0208-raw	{ JIS X 0208 (Kanji + fullwidth kana) without CES }
	   jis0212-raw	{ JIS X 0212 (Extended Kanji)	      without CES }

       Encode::KR -- Korea
	   Standard	 DOS/Win Macintosh		  Comment/Reference
	   euc-kr		 MacKorean			  [RFC1557]
			 cp949 [1]
	   iso-2022-kr						  [RFC1557]
	   johab				  [KS X 1001:1998, Annex 3]
	   ksc5601-raw				    { KSC5601 without CES }

	   [1] ks_c_5601-1987, (x-)?windows-949, and uhc are aliased to this.
	   See below.

       Encode::TW -- Taiwan
	   Standard	 DOS/Win Macintosh		  Comment/Reference
	   big5-eten	 cp950	 MacChineseTrad {big5 aliased to big5-eten}

       Encode::HanExtra -- More Chinese via CPAN
	 Due to the size concerns, additional Chinese encodings below are distributed separately
	 on CPAN, under the name Encode::HanExtra.

	   Standard	 DOS/Win Macintosh		  Comment/Reference
	   big5ext				     CMEX's Big5e Extension
	   big5plus				     CMEX's Big5+ Extension
	   cccii	 Chinese Character Code for Information Interchange
	   euc-tw			      EUC (Extended Unix Character)
	   gb18030			    GBK with Traditional Characters

       Encode::JIS2K -- JIS X 0213 encodings via CPAN
	 Due to size concerns, additional Japanese encodings below are distributed separately on
	 CPAN, under the name Encode::JIS2K.

	   Standard	 DOS/Win Macintosh		  Comment/Reference

   Miscellaneous encodings
	 See perlebcdic for details.


	 For symbols  and dingbats.


	 Strictly speaking, MIME header encoding documented in RFC 2047 is more of encapsulation
	 than encoding.  However, their support in modern world is imperative so they are

	   MIME-Header						  [RFC2047]
	   MIME-B						  [RFC2047]
	   MIME-Q						  [RFC2047]

	 This one is not a name of encoding but a utility that lets you pick up the most
	 appropriate encoding for a data out of given suspects.  See Encode::Guess for details.

Unsupported encodings
       The following encodings are not supported as yet; some because they are rarely used, some
       because of technical difficulties.  They may be supported by external modules via CPAN in
       the future, however.

       ISO-2022-JP-2 [RFC1554]
	 Not very popular yet.	Needs Unicode Database or equivalent to implement encode()
	 (because it includes JIS X 0208/0212, KSC5601, and GB2312 simultaneously, whose code
	 points in Unicode overlap.  So you need to lookup the database to determine to what
	 character set a given Unicode character should belong).

       ISO-2022-CN [RFC1922]
	 Not very popular.  Needs CNS 11643-1 and -2 which are not available in this module.  CNS
	 11643 is supported (via euc-tw) in Encode::HanExtra.  Autrijus Tang may add support for
	 this encoding in his module in future.

       Various HP-UX encodings
	 The following are unsupported due to the lack of mapping data.

	   '8'	- arabic8, greek8, hebrew8, kana8, thai8, and turkish8
	   '15' - japanese15, korean15, and roi15

       Cyrillic encoding ISO-IR-111
	 Anton Tagunov doubts its usefulness.

       ISO-8859-8-1 [Hebrew]
	 None of the Encode team knows Hebrew enough (ISO-8859-8, cp1255 and MacHebrew are
	 supported because and just because there were mappings available at
	 <http://www.unicode.org/>).  Contributions welcome.

       ISIRI 3342, Iran System, ISIRI 2900 [Farsi]

       Thai encoding TCVN

       Vietnamese encodings VPS
	 Though Jungshik Shin has reported that Mozilla supports this encoding, it was too late
	 before 5.8.0 for us to add it.  In the future, it may be available via a separate
	 module.  See <http://lxr.mozilla.org/seamonkey/source/intl/uconv/ucvlatin/vps.uf> and
	 <http://lxr.mozilla.org/seamonkey/source/intl/uconv/ucvlatin/vps.ut> if you are
	 interested in helping us.

       Various Mac encodings
	 The following are unsupported due to the lack of mapping data.

	   MacArmenian,  MacBengali,   MacBurmese,   MacEthiopic
	   MacExtArabic, MacGeorgian,  MacKannada,   MacKhmer
	   MacLaotian,	 MacMalayalam, MacMongolian, MacOriya
	   MacSinhalese, MacTamil,     MacTelugu,    MacTibetan

	 The rest which are already available are based upon the vendor mappings at
	 <http://www.unicode.org/Public/MAPPINGS/VENDORS/APPLE/> .

       (Mac) Indic encodings
	 The maps for the following are available at <http://www.unicode.org/> but remain
	 unsupported because those encodings need an algorithmical approach, currently
	 unsupported by enc2xs:


	 For details, please see "Unicode mapping issues and notes:" at
	 <http://www.unicode.org/Public/MAPPINGS/VENDORS/APPLE/DEVANAGA.TXT> .

	 I believe this issue is prevalent not only for Mac Indics but also in other Indic
	 encodings, but the above were the only Indic encodings maps that I could find at
	 <http://www.unicode.org/> .

Encoding vs. Charset -- terminology
       We are used to using the term (character) encoding and character set interchangeably.  But
       just as confusing the terms byte and character is dangerous and the terms should be
       differentiated when needed, we need to differentiate encoding and character set.

       To understand that, here is a description of how we make computers grok our characters.

       o First we start with which characters to include.  We call this collection of characters
	 character repertoire.

       o Then we have to give each character a unique ID so your computer can tell the difference
	 between 'a' and 'A'.  This itemized character repertoire is now a character set.

       o If your computer can grow the character set without further processing, you can go ahead
	 and use it.  This is called a coded character set (CCS) or raw character encoding.
	 ASCII is used this way for most cases.

       o But in many cases, especially multi-byte CJK encodings, you have to tweak a little more.
	 Your network connection may not accept any data with the Most Significant Bit set, and
	 your computer may not be able to tell if a given byte is a whole character or just half
	 of it.  So you have to encode the character set to use it.

	 A character encoding scheme (CES) determines how to encode a given character set, or a
	 set of multiple character sets.  7bit ISO-2022 is an example of a CES.  You switch
	 between character sets via escape sequences.

       Technically, or mathematically, speaking, a character set encoded in such a CES that maps
       character by character may form a CCS.  EUC is such an example.	The CES of EUC is as

       o Map ASCII unchanged.

       o Map such a character set that consists of 94 or 96 powered by N members by adding 0x80
	 to each byte.

       o You can also use 0x8e and 0x8f to indicate that the following sequence of characters
	 belongs to yet another character set.	To each following byte is added the value 0x80.

       By carefully looking at the encoded byte sequence, you can find that the byte sequence
       conforms a unique number.  In that sense, EUC is a CCS generated by a CES above from up to
       four CCS (complicated?).  UTF-8 falls into this category.  See "UTF-8" in perlUnicode to
       find out how UTF-8 maps Unicode to a byte sequence.

       You may also have found out by now why 7bit ISO-2022 cannot comprise a CCS.  If you look
       at a byte sequence \x21\x21, you can't tell if it is two !'s or IDEOGRAPHIC SPACE.  EUC
       maps the latter to \xA1\xA1 so you have no trouble differentiating between "!!". and "  ".

Encoding Classification (by Anton Tagunov and Dan Kogai)
       This section tries to classify the supported encodings by their applicability for
       information exchange over the Internet and to choose the most suitable aliases to name
       them in the context of such communication.

       o To (en|de)code encodings marked by "(**)", you need "Encode::HanExtra", available from

       Encoding names

	 US-ASCII    UTF-8    ISO-8859-*  KOI8-R
	 Shift_JIS   EUC-JP   ISO-2022-JP ISO-2022-JP-1
	 EUC-KR      Big5     GB2312

       are registered with IANA as preferred MIME names and may be used over the Internet.

       "Shift_JIS" has been officialized by JIS X 0208:1997.  "Microsoft-related naming mess"
       gives details.

       "GB2312" is the IANA name for "EUC-CN".	See "Microsoft-related naming mess" for details.

       "GB_2312-80" raw encoding is available as "gb2312-raw" with Encode. See Encode::CN for

	 KOI8-U        [RFC2319]

       have not been registered with IANA (as of March 2002) but seem to be supported by major
       web browsers.  The IANA name for "EUC-CN" is "GB2312".


       is heavily misused.  See "Microsoft-related naming mess" for details.

       "KS_C_5601-1987" raw encoding is available as "kcs5601-raw" with Encode. See Encode::KR
       for details.

	 UTF-16 UTF-16BE UTF-16LE

       are IANA-registered "charset"s. See [RFC 2781] for details.  Jungshik Shin reports that
       UTF-16 with a BOM is well accepted by MS IE 5/6 and NS 4/6. Beware however that

       o "UTF-16" support in any software you're going to be using/interoperating with has
	 probably been less tested then "UTF-8" support

       o "UTF-8" coded data seamlessly passes traditional command piping ("cat", "more", etc.)
	 while "UTF-16" coded data is likely to cause confusion (with its zero bytes, for

       o it is beyond the power of words to describe the way HTML browsers encode non-"ASCII"
	 form data. To get a general impression, visit
	 <http://www.alanflavell.org.uk/charset/form-i18n.html>.  While encoding of form data has
	 stabilized for "UTF-8" encoded pages (at least IE 5/6, NS 6, and Opera 6 behave
	 consistently), be sure to expect fun (and cross-browser discrepancies) with "UTF-16"
	 encoded pages!

       The rule of thumb is to use "UTF-8" unless you know what you're doing and unless you
       really benefit from using "UTF-16".

	 ISO-IR-165    [RFC1345]
	 GB 12345
	 GB 18030 (**)	(see links bellow)
	 EUC-TW   (**)

       are totally valid encodings but not registered at IANA.	The names under which they are
       listed here are probably the most widely-known names for these encodings and are
       recommended names.

	 BIG5PLUS (**)

       is a proprietary name.

   Microsoft-related naming mess
       Microsoft products misuse the following names:

	 Microsoft extension to "EUC-KR".

	 Proper names: "CP949", "UHC", "x-windows-949" (as used by Mozilla).

	 See <http://lists.w3.org/Archives/Public/ietf-charsets/2001AprJun/0033.html> for

	 Encode aliases "KS_C_5601-1987" to "cp949" to reflect this common misusage. Raw
	 "KS_C_5601-1987" encoding is available as "kcs5601-raw".

	 See Encode::KR for details.

	 Microsoft extension to "EUC-CN".

	 Proper names: "CP936", "GBK".

	 "GB2312" has been registered in the "EUC-CN" meaning at IANA. This has partially
	 repaired the situation: Microsoft's "GB2312" has become a superset of the official

	 Encode aliases "GB2312" to "euc-cn" in full agreement with IANA registration. "cp936" is
	 supported separately.	Raw "GB_2312-80" encoding is available as "gb2312-raw".

	 See Encode::CN for details.

	 Microsoft extension to "Big5".

	 Proper name: "CP950".

	 Encode separately supports "Big5" and "cp950".

	 Microsoft's understanding of "Shift_JIS".

	 JIS has not endorsed the full Microsoft standard however.  The official "Shift_JIS"
	 includes only JIS X 0201 and JIS X 0208 character sets, while Microsoft has always used
	 "Shift_JIS" to encode a wider character repertoire. See "IANA" registration for

	 As a historical predecessor, Microsoft's variant probably has more rights for the name,
	 though it may be objected that Microsoft shouldn't have used JIS as part of the name in
	 the first place.

	 Unambiguous name: "CP932". "IANA" name (also used by Mozilla, and provided as an alias
	 by Encode): "Windows-31J".

	 Encode separately supports "Shift_JIS" and "cp932".

       character repertoire
	 A collection of unique characters.  A character set in the strictest sense. At this
	 stage, characters are not numbered.

       coded character set (CCS)
	 A character set that is mapped in a way computers can use directly.  Many character
	 encodings, including EUC, fall in this category.

       character encoding scheme (CES)
	 An algorithm to map a character set to a byte sequence.  You don't have to be able to
	 tell which character set a given byte sequence belongs.  7-bit ISO-2022 is a CES but it
	 cannot be a CCS.  EUC is an example of being both a CCS and CES.

       charset (in MIME context)
	 has long been used in the meaning of "encoding", CES.

	 While the word combination "character set" has lost this meaning in MIME context since
	 [RFC 2130], the "charset" abbreviation has retained it. This is how [RFC 2277] and [RFC
	 2278] bless "charset":

	  This document uses the term "charset" to mean a set of rules for
	  mapping from a sequence of octets to a sequence of characters, such
	  as the combination of a coded character set and a character encoding
	  scheme; this is also what is used as an identifier in MIME "charset="
	  parameters, and registered in the IANA charset registry ...  (Note
	  that this is NOT a term used by other standards bodies, such as ISO).
	  [RFC 2277]

	 Extended Unix Character.  See ISO-2022.

	 A CES that was carefully designed to coexist with ASCII.  There are a 7 bit version and
	 an 8 bit version.

	 The 7 bit version switches character set via escape sequence so it cannot form a CCS.
	 Since this is more difficult to handle in programs than the 8 bit version, the 7 bit
	 version is not very popular except for iso-2022-jp, the de facto standard CES for

	 The 8 bit version can form a CCS.  EUC and ISO-8859 are two examples thereof.	Pre-5.6
	 perl could use them as string literals.

	 Short for Universal Character Set.  When you say just UCS, it means Unicode.

	 ISO/IEC 10646 encoding form: Universal Character Set coded in two octets.

	 A character set that aims to include all character repertoires of the world.  Many
	 character sets in various national as well as industrial standards have become, in a
	 way, just subsets of Unicode.

	 Short for Unicode Transformation Format.  Determines how to map a Unicode character into
	 a byte sequence.

	 A UTF in 16-bit encoding.  Can either be in big endian or little endian.  The big endian
	 version is called UTF-16BE (equal to UCS-2 + surrogate support) and the little endian
	 version is called UTF-16LE.

See Also
       Encode, Encode::Byte, Encode::CN, Encode::JP, Encode::KR, Encode::TW, Encode::EBCDIC,
       Encode::Symbol Encode::MIME::Header, Encode::Guess

	 European Computer Manufacturers Association <http://www.ecma.ch>

	 ECMA-035 (eq "ISO-2022")

	   The specification of ISO-2022 is available from the link above.

	 Internet Assigned Numbers Authority <http://www.iana.org/>

	 Assigned Charset Names by IANA

	   Most of the "canonical names" in Encode derive from this list so you can directly
	   apply the string you have extracted from MIME header of mails and web pages.

	 International Organization for Standardization <http://www.iso.ch/>

	 Request For Comments -- need I say more?  <http://www.rfc-editor.org/>,
	 <http://www.ietf.org/rfc.html>, <http://www.faqs.org/rfcs/>

	 Unicode Consortium <http://www.unicode.org/>

	 Unicode Glossary

	   The glossary of this document is based upon this site.

   Other Notable Sites

	 Contains a lot of useful information, especially gory details of ISO vs. vendor


	 Somewhat obsolete (last update in 1996), but still useful.  Also try


	 You will find brief info on "EUC-CN", "GBK" and mostly on "GB 18030".

       Jungshik Shin's Hangul FAQ

	 And especially its subject 8.


	 A comprehensive overview of the Korean ("KS *") standards.

       debian.org: "Introduction to i18n"
	 A brief description for most of the mentioned CJK encodings is contained in

   Offline sources
       "CJKV Information Processing" by Ken Lunde
	 CJKV Information Processing 1999 O'Reilly & Associates, ISBN : 1-56592-224-7

	 The modern successor of "CJK.inf".

	 Features a comprehensive coverage of CJKV character sets and encodings along with many
	 other issues faced by anyone trying to better support CJKV languages/scripts in all the
	 areas of information processing.

	 To purchase this book, visit <http://oreilly.com/catalog/9780596514471/> or your
	 favourite bookstore.

perl v5.16.3				    2013-02-18			     Encode::Supported(3)
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