Windows-1258 is a
code page used in
Microsoft Windows to represent
Vietnamese
Vietnamese may refer to:
* Something of, from, or related to Vietnam, a country in Southeast Asia
** A citizen of Vietnam. See Demographics of Vietnam.
* Vietnamese people, or Kinh people, a Southeast Asian ethnic group native to Vietnam
** Overse ...
texts. It makes use of
combining diacritical mark
In digital typography, combining characters are characters that are intended to modify other characters. The most common combining characters in the Latin script are the combining diacritical marks (including combining accents).
Unicode al ...
s.
Windows-1258 is compatible with neither the Vietnamese standard (
TCVN 5712
VSCII (Vietnamese Standard Code for Information Interchange), also known as TCVN 5712, ISO-IR-180, .VN, ABC or simply the TCVN encodings, is a set of three closely related Vietnamese national standard character encodings for using the Vietname ...
/ VSCII), nor the various other encodings in use in practice (
VISCII
VISCII is an unofficially-defined modified ASCII character encoding for using the Vietnamese language with computers. It should not be confused with the similarly-named officially registered VSCII encoding. VISCII keeps the 95 printable chara ...
,
VNI
VNI Software Company is a developer of various education, entertainment, office, and utility computer software, software packages. They are known for developing an Character encoding, encoding (VNI encoding) and a popular input method (VNI Input) ...
,
VPS). Rather, it is very similar to
Windows-1252
Windows-1252 or CP-1252 ( code page 1252) is a single-byte character encoding of the Latin alphabet, used by default in the legacy components of Microsoft Windows for English and many European languages including Spanish, French, and German.
I ...
, with the differences being that s-caron and z-caron (which were added to Windows-1252 later) are missing, five of the letters with diacritics have been replaced by combining diacritics for
Vietnamese tone marks, one has been replaced with the
đông sign, and eight others (four per case) have been changed to four otherwise-unsupported
Vietnamese letters.
Use of combining diacritics means that Windows-1258 can cover the large number of combinations of letters and tone marks in Vietnamese without compromising coverage of control codes or symbols. However it also means that software must be careful to handle conversions between precomposed characters and combining sequences correctly when converting to/from other encodings and makes determining user-visible length of a string more difficult.
IBM uses code page 1258 (
CCSID
A CCSID (coded character set identifier) is a 16-bit number that represents a particular encoding of a specific code page. For example, Unicode is a code page that has several encoding (so called "transformation") forms, like UTF-8, UTF-16 and U ...
1258 and
euro sign extended CCSID 5354) for Windows-1258.
UTF-8
UTF-8 is a variable-length character encoding used for electronic communication. Defined by the Unicode Standard, the name is derived from ''Unicode'' (or ''Universal Coded Character Set'') ''Transformation Format 8-bit''.
UTF-8 is capable of ...
is the preferred encoding for Vietnamese in modern applications. Windows-1258 may not always
round-trip Unicode encoded Vietnamese due to changes caused by
Unicode normalization
Unicode equivalence is the specification by the Unicode character encoding standard that some sequences of code points represent essentially the same character. This feature was introduced in the standard to allow compatibility with preexisting s ...
.
Combining diacritics are encoded after the letter in both Windows-1258 and Unicode
(like
VNI
VNI Software Company is a developer of various education, entertainment, office, and utility computer software, software packages. They are known for developing an Character encoding, encoding (VNI encoding) and a popular input method (VNI Input) ...
, unlike
ANSEL
ANSEL, the American National Standard for Extended Latin Alphabet Coded Character Set for Bibliographic Use, was a character set used in text encoding. It provided a table of coded values for the representation of characters of the extended Latin ...
).
Character set
The following table shows Windows-1258. Each character is shown with its
Unicode
Unicode, formally The Unicode Standard,The formal version reference is is an information technology standard for the consistent encoding, representation, and handling of text expressed in most of the world's writing systems. The standard, wh ...
equivalent.
Code page 1129
IBM's code page 1129 (
CCSID
A CCSID (coded character set identifier) is a 16-bit number that represents a particular encoding of a specific code page. For example, Unicode is a code page that has several encoding (so called "transformation") forms, like UTF-8, UTF-16 and U ...
1129 and
euro sign extended CCSID 1163)
is similar to code page 1258, but with the following differences:
See also
*
VSCII
VSCII (Vietnamese Standard Code for Information Interchange), also known as TCVN 5712, ISO-IR-180, .VN, ABC or simply the TCVN encodings, is a set of three closely related Vietnamese national standard character encodings for using the Vietname ...
*
VISCII
VISCII is an unofficially-defined modified ASCII character encoding for using the Vietnamese language with computers. It should not be confused with the similarly-named officially registered VSCII encoding. VISCII keeps the 95 printable chara ...
*
VNI Character Set
VNI Software Company is a developer of various education, entertainment, office, and utility software packages. They are known for developing an encoding (VNI encoding) and a popular input method (VNI Input) for Vietnamese on for computers. VNI is ...
*
VPS character encoding
References
External links
IANA Charset Name Registration of windows-1258Michael Kaplan's blog describing the Windows 1258 encoding behavior
{{Character encodings
Windows code pages