Windows-1258 is a

code page In computing, a code page is a character encoding and as such it is a specific association of a set of printable character (computing), characters and control characters with unique numbers. Typically each number represents the binary value in a s ...

used in

Microsoft Windows Windows is a Product lining, product line of Proprietary software, proprietary graphical user interface, graphical operating systems developed and marketed by Microsoft. It is grouped into families and subfamilies that cater to particular sec ...

to represent Vietnamese texts. It makes use of

combining diacritical mark In digital typography, combining characters are Character (computing), characters that are intended to modify other characters. The most common combining characters in the Latin script are the combining diacritic, diacritical marks (including c ...

s. Windows-1258 is compatible with neither the Vietnamese standard ( TCVN 5712 / VSCII), nor the various other encodings in use in practice ( VISCII, VNI, VPS). Rather, it is very similar to

Windows-1252 Windows-1252 or CP-1252 ( Windows code page 1252) is a legacy single-byte character encoding that is used by default (as the "ANSI code page") in Microsoft Windows throughout the Americas, Western Europe, Oceania, and much of Africa. Initially ...

, 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that s-caron and z-caron (which were added to Windows-1252 later) are missing, five of the letters with diacritics have been replaced by combining diacritics for Vietnamese tone marks, one has been replaced with the đông sign, and eight others (four per case) have been changed to four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 International Business Machines Corporation (using the trademark IBM), nicknamed Big Blue, is an American Multinational corporation, multinational technology company headquartered in Armonk, New York, and present in over 175 countries. It is ...

uses code page 1258 ( CCSID 1258 and

euro sign The euro sign () is the currency sign used for the euro, the official currency of the eurozone. The design was presented to the public by the European Commission on 12 December 1996. It consists of a stylized letter E (or epsilon), crossed by ...

extended CCSID 5354) for Windows-1258.

UTF-8 UTF-8 is a character encoding standard used for electronic communication. Defined by the Unicode Standard, the name is derived from ''Unicode Transformation Format 8-bit''. Almost every webpage is transmitted as UTF-8. UTF-8 supports all 1,112,0 ...

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 (computing), character encoding standard that some sequences of code points represent essentially the same character. This feature was introduced in the standard to allow compatibi ...

. Combining diacritics are encoded after the letter in both Windows-1258 and Unicode (like VNI, unlike ANSEL).

Character set

The following table shows Windows-1258. Each character is shown with its

Unicode Unicode or ''The Unicode Standard'' or TUS is a character encoding standard maintained by the Unicode Consortium designed to support the use of text in all of the world's writing systems that can be digitized. Version 16.0 defines 154,998 Char ...

equivalent.

Code page 1129

IBM's code page 1129 ( CCSID 1129 and

extended CCSID 1163) is similar to code page 1258, but with the following differences:

References

External links

IANA Charset Name Registration of windows-1258Michael Kaplan's blog describing the Windows 1258 encoding behavior
{{Character encodings Windows code pages

Character set

Code page 1129

See also

References

External links