所谓代码页 (codepage) 就是各国的文字编码和 Unicode 之间的映射表。

例如 GBK 和 Unicode 的映射表就是 CP936，所以也常用 cp936 来指代 GBK。

Code Pages Supported by Windows

The lists below provide links to graphical representations and textual listings of each of the Windows codepages.

• 1250 (Central Europe)
• 1251 (Cyrillic)
• 1252 (Latin I)
• 1253 (Greek)
• 1254 (Turkish)
• 1255 (Hebrew)
• 1256 (Arabic)
• 1257 (Baltic)
• 1258 (Vietnam)
• 874 (Thai)

DBCS (Double Byte Character Set) Codepages

In these graphical representations, leadbytes are indicated by light gray background shading.
Each of these leadbytes hyperlinks to a new page showing the 256 character block associated with that leadbyte.
Unused leadbytes are identified by a darker gray background.

• 932 (Japanese Shift-JIS)
• 936 (Simplified Chinese GBK)
• 949 (Korean)
• 950 (Traditional Chinese Big5)

Windows OEM Code Pages

The list below provides links to graphical representations, and textual listings, of each of the Windows OEM code pages:

• 437 (US)
• 720 (Arabic)
• 737 (Greek)
• 775 (Baltic)
• 850 (Multilingual Latin I)
• 852 (Latin II)
• 855 (Cyrillic)
• 857 (Turkish)
• 858 (Multilingual Latin I + Euro)
• 862 (Hebrew)
• 866 (Russian)

Windows ANSI and OEM Code Pages

• 874 (Thai)
• 932 (Japanese Shift-JIS)
• 936 (Simplified Chinese GBK)
• 949 (Korean)
• 950 (Traditional Chinese Big5)
• 1258 (Vietnam)

ISO Code Pages

The list below provides links to graphical representations, and textual listings, of each of the ISO 8859 character sets:

• ISO-8859-1 (Latin 1)
• ISO-8859-2 (Latin 2)
• ISO-8859-3 (Latin 3)
• ISO-8859-4 (Baltic)
• ISO-8859-5 (Cyrillic)
• ISO-8859-6 (Arabic)
• ISO-8859-8 (Hebrew)
• ISO-8859-9 (Turkish)
• ISO-8859-15 (Latin 9)

http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/

 CP874.TXT                        21-Nov-2006 18:58  8.2K  

 CP932.TXT                        21-Nov-2006 18:58  288K  

 CP936.TXT                        21-Nov-2006 18:59  798K  

 CP949.TXT                        21-Nov-2006 19:00  772K  

 CP950.TXT                        21-Nov-2006 19:01  497K  

 CP1250.TXT                       21-Nov-2006 18:56  9.3K  

 CP1251.TXT                       21-Nov-2006 18:57  9.0K  

 CP1252.TXT                       21-Nov-2006 18:57  9.1K  

 CP1253.TXT                       21-Nov-2006 18:57  8.7K  

 CP1254.TXT                       21-Nov-2006 18:57  9.1K  

 CP1255.TXT                       21-Nov-2006 18:57  8.1K  

 CP1256.TXT                       21-Nov-2006 18:58  8.5K  

 CP1257.TXT                       21-Nov-2006 18:58  9.0K  

 CP1258.TXT                       21-Nov-2006 18:58  9.0K  

http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WindowsBestFit/readme.txt

The following files describe windows code page behavior for the "ansi" code pages provided by Microsoft.

File               Code Page       Descriptionbestfit874.txt     windows-874     ANSI/OEM Thai (same as 28605, ISO 8859-15); Thai (Windows)
bestfit932.txt     shift_jis       ANSI/OEM Japanese; Japanese (Shift-JIS)
bestfit936.txt     gb2312          ANSI/OEM Simplified Chinese (PRC, Singapore); Chinese Simplified (GB2312)
bestfit949.txt     ks_c_5601-1987  ANSI/OEM Korean (Unified Hangul Code)
bestfit950.txt     big5            ANSI/OEM Traditional Chinese (Taiwan; Hong Kong SAR, PRC); Chinese Traditional (Big5)
bestfit1250.txt    windows-1250    ANSI Central European; Central European (Windows)
bestfit1251.txt    windows-1251    ANSI Cyrillic; Cyrillic (Windows)
bestfit1252.txt    windows-1252    ANSI Latin 1; Western European (Windows)
bestfit1253.txt    windows-1253    ANSI Greek; Greek (Windows)
bestfit1254.txt    windows-1254    ANSI Turkish; Turkish (Windows)
bestfit1255.txt    windows-1255    ANSI Hebrew; Hebrew (Windows)
bestfit1256.txt    windows-1256    ANSI Arabic; Arabic (Windows)
bestfit1257.txt    windows-1257    ANSI Baltic; Baltic (Windows)
bestfit1258.txt    windows-1258    ANSI/OEM Vietnamese; Vietnamese (Windows)

These tables include "best fit" behavior which is not present in the other files. Examples of best fit
are converting fullwidth letters to their counterparts when converting to single byte code pages, and
mapping the Infinity character to the number 8.932, 936, 949 and 950 are all double byte code pages. The remainder are single byte code pages. Each file
is encoded in the code page it describes, eg: bestfit1252.txt is encoded in the windows-1252 encoding. The only
non-ASCII characters however are in the comments so these files may be read by an ASCII parser if necessary.Each file has sections of key word tags and records. Any text after a ; is ignored as are blank lines. Fields are
delimited by one or more space or tab characters. Each section begins one of the following tags:CODEPAGE
CPINFO
MBTABLE
WCTABLE
DBCSRANGE  (double byte code pages only)
DBSCTABLE  (double byte code pages only)Descriptions of each tag are:CODEPAGE 932            ; Japanese - ANSI, OEMThe CODEPAGE tag contains 1 field and marks the start of the code page file.Field 1 -- The only field is the decimal windows code page number for this code page.CPINFO 2 0x3f 0x30fb    ; DBCS CP, Unic Default Char = Katakana Middle DotThe CPINFO tag describes the code page with 3 fields:Field 1 -- "1" for a single byte code page, "2" for a double byte code page.Field 2 -- Replacement characters for unassigned Unicode code points when written to thiscode page (currently always ?)Field 3 -- Replacement characters for illegal or unassigned code page values when converting to Unicode.This is Katakana middle dot for 932 and ? for all other code pages.MBTABLE 256The MBTABLE tag marks the start of the "Multibyte" code page to Unicode conversion table. It has 1 field.Field 1 -- This field contains the number of following records of code page to Unicode mappings. Note thatlead bytes dont have mappings, so this is not always 256. For 932 for example it is 196.MultiByte Mapping Records:0x00    0x0000  ;Null
0x01    0x0001  ;Start Of Heading
...
0x30    0x0030  ;Digit 0
0x31    0x0031  ;Digit 1
...Each record consists of two fields to map from the code page to Unicode.Field 1 -- The code page byte that is being mapped to Unicode, eg "0x3f"Field 2 -- The Unicode UTF-16 code point that this byte maps to, eg "0x003f"DBCSRANGE  2            ;2 DBCS Lead Byte Ranges: 0x81-0x9f and 0xe0-0xfcThe DBSCRANGE describes the number of double byte ranges for double byte code page. Ranges are consecutivelead byte values such as 0x81-0x9fField 1 -- This field contains the number of double byte ranges. The next record is the 1st lead byte range0x81  0x9f              ;Lead Byte RangeThis record describes the first lead byte range. It is the first record after DBCSRANGE and is followed by one
DBCSTABLE record for each lead byte in the range. If there are additional ranges, another Lead Byte Range record
will follow the last DBCSTABLE in the previous range.Field 1 -- This field is the first lead byte used in this range.Field 2 -- This field is the last lead byte used in this rangeDBCSTABLE 147           ;LeadByte = 0x81The DBCSTABLE record describes the mappings available for a particular lead byte. The comment is ignored butdescriptive. The lead byte of the first DBCSTABLE is the first lead byte of the previous Lead Byte Rangerecord. Each subsequent DBCSTABLE is for the next consecutive lead byte value.Field 1 -- This field is the number of trail byte mappings following.Double byte mapping records:0x40 0x3000  ;   Ideographic Space
0x41    0x3001  ;   Ideographic Comma
...Field 1 -- This field is the trail byte to map from.Field 2 -- This field is the Unicode UTF-16 code point that this lead byte/trail byte combination map to.Example:DBCSRANGE  2            ;2 DBCS Lead Byte Ranges: 0x81-0x9f and 0xe0-0xfc0x81  0x9f              ;Lead Byte RangeDBCSTABLE 147           ;LeadByte = 0x810x40  0x3000  ;   Ideographic Space
0x41    0x3001  ;   Ideographic Comma
...The preceeding example would map the byte sequences 0x81 0x40 to U+3000 and 0x81 0x41 to U+3001.WCTABLE 698The WCTABLE tag marks the start of the Unicode UTF-16 (WideChar) to "MultiByte" bytes. It has 1 field.Field 1 -- This field contains the number of records of Unicode to byte mappings. Note that this is oftenmore than the number of round trip mappings supported by the code page due to windows "Best Fit" behavior.Unicode UTF-16 (WideChar) Mapping Records:These take two forms, differing between single byte and double byte code pages. Both forms have 2 fields:Single byte WCTABLE records:0x0000  0x00    ;Null
0x0001  0x01    ;Start Of Heading
...
0x0061  0x61    ;Latin Small Letter A
0x0062  0x62    ;Latin Small Letter B
0x0063  0x63    ;Latin Small Letter C
...
0x221e  0x38    ;Infinity                        << Best Fit Mapping
...
0xff41  0x61    ;Fullwidth Latin Small Letter A  << Best Fit Mapping
0xff42  0x62    ;Fullwidth Latin Small Letter B  << Best Fit Mapping
0xff43  0x63    ;Fullwidth Latin Small Letter C  << Best Fit Mapping
...Field 1 -- The Unicode UTF-16 code point for the character being converted.Field 2 -- The single byte that this UTF-16 code point maps to. If a reverse mapping does not in the MBTABLE,then this is a Best Fit mapping.Multibyte WCTABLE records:0x0000 0x0000  ;   Null
0x0001  0x0001  ;   Start Of Heading
...
0x0061  0x0061  ;   a
0x0062  0x0062  ;   b
0x0063  0x0063  ;   c
...
0x221e  0x8187  ;   Infinity
...
0xff41  0x8281  ;   Fullwidth a
0xff42  0x8282  ;   Fullwidth b
0xff43  0x8283  ;   Fullwidth c
...Field 1 -- The Unicode UTF-16 code point for the character being converted.Field 2 -- The byte or bytes that this code point maps to as a 16 bit value. The high byte is the lead byte,and the low byte is the trail byte. If the high byte is 0, then this is a single byte code point, withthe value of the low byte and no lead byte is emitted.ENDCODEPAGEThis tag marks the end of the code page data. Anything after this marker is ignored.

 bestfit874.txt                   04-Oct-2006 15:58   19K  

 bestfit932.txt                   04-Oct-2006 15:58  353K  

 bestfit936.txt                   04-Oct-2006 15:58  852K  

 bestfit949.txt                   04-Oct-2006 15:58  1.2M  

 bestfit950.txt                   04-Oct-2006 15:58  689K  

 bestfit1250.txt                  04-Oct-2006 15:58   36K  

 bestfit1251.txt                  04-Oct-2006 15:58   35K  

 bestfit1252.txt                  04-Oct-2006 15:58   36K  

 bestfit1253.txt                  04-Oct-2006 15:58   33K  

 bestfit1254.txt                  04-Oct-2006 15:58   36K  

 bestfit1255.txt                  04-Oct-2006 15:58   20K  

 bestfit1256.txt                  04-Oct-2006 15:58   29K  

 bestfit1257.txt                  04-Oct-2006 15:58   16K  

 bestfit1258.txt                  04-Oct-2006 15:58   22K  

 bestfit1361.txt                  13-Mar-2012 19:43  1.2M  

 readme.txt                       05-Oct-2006 16:22  7.2K  

http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/PC/

 CP437.TXT                        21-Nov-2006 18:54  9.6K  

 CP737.TXT                        21-Nov-2006 18:54  9.6K  

 CP775.TXT                        21-Nov-2006 18:54  9.5K  

 CP850.TXT                        21-Nov-2006 18:54  9.4K  

 CP852.TXT                        21-Nov-2006 18:54  9.7K  

 CP855.TXT                        21-Nov-2006 18:54  9.3K  

 CP857.TXT                        21-Nov-2006 18:54  9.4K  

 CP860.TXT                        21-Nov-2006 18:54  9.6K  

 CP861.TXT                        21-Nov-2006 18:54  9.6K  

 CP862.TXT                        21-Nov-2006 18:54  9.2K  

 CP863.TXT                        21-Nov-2006 18:54  9.5K  

 CP864.TXT                        21-Nov-2006 18:54  9.3K  

 CP865.TXT                        21-Nov-2006 18:55  9.6K  

 CP866.TXT                        21-Nov-2006 18:55  9.5K  

 CP869.TXT                        21-Nov-2006 18:55  9.1K  

 CP874.TXT                        21-Nov-2006 18:55  8.3K

http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/EBCDIC/

 CP037.TXT                        21-Nov-2006 18:52  8.8K  

 CP500.TXT                        21-Nov-2006 18:53  8.8K  

 CP875.TXT                        21-Nov-2006 18:53  8.5K  

 CP1026.TXT                       21-Nov-2006 18:52  8.8K

http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/MAC/

 CYRILLIC.TXT                     21-Nov-2006 18:53  9.0K  

 GREEK.TXT                        21-Nov-2006 18:53  9.2K  

 ICELAND.TXT                      21-Nov-2006 18:53  9.0K  

 LATIN2.TXT                       21-Nov-2006 18:53  9.6K  

 ROMAN.TXT                        21-Nov-2006 18:53  9.0K  

 TURKISH.TXT                      21-Nov-2006 18:53  9.0K 

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