Windows-1258

Windows-1258 is a code page used in Microsoft Windows to represent Vietnamese texts. It makes use of combining diacritical marks.

Windows-1258

MIME / IANA	windows-1258
Language(s)	Vietnamese, English
Created by	Microsoft
Standard	WHATWG Encoding Standard
Classification	extended ASCII, Windows-125x
Based on	Windows-1252

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, 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that s-caron and z-caron (which were added to Windows-1252 later) are missing, five of the letters with diacritics have been replaced by combining diacritics for Vietnamese tone marks, one has been replaced with the đông sign, and eight others (four per case) have been changed to four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 1258 and euro sign extended CCSID 5354) for Windows-1258.[1][2][3]

UTF-8 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.[4] Combining diacritics are encoded after the letter in both Windows-1258 and Unicode[4] (like VNI, unlike ANSEL).

Character set

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

Windows-1258[5][6][7][8][9][10]

	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
0_ 0	NUL 0000	SOH 0001	STX 0002	ETX 0003	EOT 0004	ENQ 0005	ACK 0006	BEL 0007	BS 0008	HT 0009	LF 000A	VT 000B	FF 000C	CR 000D	SO 000E	SI 000F
1_ 16	DLE 0010	DC1 0011	DC2 0012	DC3 0013	DC4 0014	NAK 0015	SYN 0016	ETB 0017	CAN 0018	EM 0019	SUB 001A	ESC 001B	FS 001C	GS 001D	RS 001E	US 001F
2_ 32	SP 0020	! 0021	" 0022	# 0023	$ 0024	% 0025	& 0026	' 0027	( 0028	) 0029	* 002A	+ 002B	, 002C	- 002D	. 002E	/ 002F
3_ 48	0 0030	1 0031	2 0032	3 0033	4 0034	5 0035	6 0036	7 0037	8 0038	9 0039	: 003A	; 003B	< 003C	= 003D	> 003E	? 003F
4_ 64	@ 0040	A 0041	B 0042	C 0043	D 0044	E 0045	F 0046	G 0047	H 0048	I 0049	J 004A	K 004B	L 004C	M 004D	N 004E	O 004F
5_ 80	P 0050	Q 0051	R 0052	S 0053	T 0054	U 0055	V 0056	W 0057	X 0058	Y 0059	Z 005A	[ 005B	\ 005C	] 005D	^ 005E	_ 005F
6_ 96	` 0060	a 0061	b 0062	c 0063	d 0064	e 0065	f 0066	g 0067	h 0068	i 0069	j 006A	k 006B	l 006C	m 006D	n 006E	o 006F
7_ 112	p 0070	q 0071	r 0072	s 0073	t 0074	u 0075	v 0076	w 0077	x 0078	y 0079	z 007A	{ 007B	| 007C	} 007D	~ 007E	DEL 007F
8_ 128	€ 20AC		‚ 201A	ƒ 0192	„ 201E	… 2026	† 2020	‡ 2021	ˆ 02C6	‰ 2030		‹ 2039	Œ 0152
9_ 144		‘ 2018	’ 2019	“ 201C	” 201D	• 2022	– 2013	— 2014	˜ 02DC	™ 2122		› 203A	œ 0153			Ÿ 0178
A_ 160	NBSP 00A0	¡ 00A1	¢ 00A2	£ 00A3	¤ 00A4	¥ 00A5	¦ 00A6	§ 00A7	¨ 00A8	© 00A9	ª 00AA	« 00AB	¬ 00AC	SHY 00AD	® 00AE	¯ 00AF
B_ 176	° 00B0	± 00B1	² 00B2	³ 00B3	´ 00B4	µ 00B5	¶ 00B6	· 00B7	¸ 00B8	¹ 00B9	º 00BA	» 00BB	¼ 00BC	½ 00BD	¾ 00BE	¿ 00BF
C_ 192	À 00C0	Á 00C1	Â 00C2	Ă 0102	Ä 00C4	Å 00C5	Æ 00C6	Ç 00C7	È 00C8	É 00C9	Ê 00CA	Ë 00CB	̀ 0300	Í 00CD	Î 00CE	Ï 00CF
D_ 208	Đ 0110	Ñ 00D1	̉ 0309	Ó 00D3	Ô 00D4	Ơ 01A0	Ö 00D6	× 00D7	Ø 00D8	Ù 00D9	Ú 00DA	Û 00DB	Ü 00DC	Ư 01AF	̃ 0303	ß 00DF
E_ 224	à 00E0	á 00E1	â 00E2	ă 0103	ä 00E4	å 00E5	æ 00E6	ç 00E7	è 00E8	é 00E9	ê 00EA	ë 00EB	́ 0301	í 00ED	î 00EE	ï 00EF
F_ 240	đ 0111	ñ 00F1	̣ 0323	ó 00F3	ô 00F4	ơ 01A1	ö 00F6	÷ 00F7	ø 00F8	ù 00F9	ú 00FA	û 00FB	ü 00FC	ư 01B0	₫ 20AB	ÿ 00FF

  Letter   Number   Punctuation   Symbol   Other   Undefined   Differences from Windows-1252

Code page 1129

IBM's code page 1129 (CCSID 1129 and euro sign extended CCSID 1163)[11][12][13] is similar to code page 1258, but with the following differences:

Code page 1129 (differences from code page 1258)[14][15][16][17][18][19]

	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
8_ 128
9_ 144
A_ 160	NBSP 00A0	¡ 00A1	¢ 00A2	£ 00A3	¤ 00A4	¥ 00A5	¦ 00A6	§ 00A7	œ 0153	© 00A9	ª 00AA	« 00AB	¬ 00AC	SHY 00AD	® 00AE	¯ 00AF
B_ 176	° 00B0	± 00B1	² 00B2	³ 00B3	Ÿ 0178	µ 00B5	¶ 00B6	· 00B7	Œ 0152	¹ 00B9	º 00BA	» 00BB	¼ 00BC	½ 00BD	¾ 00BE	¿ 00BF

  Letter   Number   Punctuation   Symbol   Other   Undefined   Differences from Windows-1258

See also

• VSCII
• VISCII
• VNI Character Set
• VPS character encoding

References

1. "Code page 1258 information document". Archived from the original on 2016-03-03.
2. "CCSID 1258 information document". Archived from the original on 2014-11-29.
3. "CCSID 5354 information document". Archived from the original on 2014-11-29.
4. Kaplan, Michael S. (2005-04-19). "A few of the gotchas of MultiByteToWideChar". Sorting it all out.
5. Steele, Shawn (1998-04-15). "cp1258 to Unicode table". Microsoft.
6. Unicode mappings of windows 1258 with "best fit"
7. Code Page CPGID 01258 (pdf) (PDF), IBM
8. Code Page CPGID 01258 (txt), IBM
9. International Components for Unicode (ICU), ibm-1258_P100-1997.ucm, 2002-12-03
10. International Components for Unicode (ICU), ibm-5354_P100-1998.ucm, 2002-12-03
11. "Code page 1129 information document". Archived from the original on 2010-09-21.
12. "CCSID 1129 information document". Archived from the original on 2016-03-27.
13. "CCSID 1163 information document". Archived from the original on 2014-11-29.
14. Lunde, Ken. "Appendix L: Vietnamese Character Sets" (PDF). CJKV Information Processing (2nd ed.). ISBN 978-0-596-51447-1.
15. Code Page CPGID 01129 (pdf) (PDF), IBM
16. Code Page CPGID 01129 (txt), IBM
17. International Components for Unicode (ICU), ibm-1129_P100-1997.ucm, 2002-12-03
18. Code Page CPGID 01163 (pdf) (PDF), IBM
19. Code Page CPGID 01163 (txt), IBM

External links

• IANA Charset Name Registration of windows-1258
• Michael Kaplan's blog describing the Windows 1258 encoding behavior