# js-codepage

[Codepages](https://en.wikipedia.org/wiki/Codepage) are character encodings. In

many contexts, single- or double-byte character sets are used in lieu of Unicode

encodings. The codepages map between characters and numbers.

## Setup

In node:

```js

var cptable = require('codepage');

```

In the browser:

```html

<script src="cptable.js"></script>

<script src="cputils.js"></script>

```

Alternatively, use the full version in the dist folder:

```html

<script src="cptable.full.js"></script>

```

The complete set of codepages is large due to some Double Byte Character Set

encodings. A much smaller file that only includes SBCS codepages is provided in

this repo (`sbcs.js`), as well as a file for other projects (`cpexcel.js`)

If you know which codepages you need, you can include individual scripts for

each codepage. The individual files are provided in the `bits/` directory.

For example, to include only the Mac codepages:

```html

<script src="bits/10000.js"></script>

<script src="bits/10006.js"></script>

<script src="bits/10007.js"></script>

<script src="bits/10029.js"></script>

<script src="bits/10079.js"></script>

<script src="bits/10081.js"></script>

```

All of the browser scripts define and append to the `cptable` object. To rename

the object, edit the `JSVAR` shell variable in `make.sh` and run the script.

The utilities functions are contained in `cputils.js`, which assumes that the

appropriate codepage scripts were loaded.

The script will manipulate `module.exports` if available . This is not always

desirable. To prevent the behavior, define `DO_NOT_EXPORT_CODEPAGE`.

## Usage

Most codepages are indexed by number. To get the Unicode character for a given

codepoint, use the `dec` property:

```js

var unicode_cp10000_255 = cptable[10000].dec[255]; // ˇ

```

To get the codepoint for a given character, use the `enc` property:

```js

var cp10000_711 = cptable[10000].enc[String.fromCharCode(711)]; // 255

```

There are a few utilities that deal with strings and buffers:

```js

var 汇总 = cptable.utils.decode(936, [0xbb,0xe3,0xd7,0xdc]);

var buf = cptable.utils.encode(936, 汇总);

var sushi= cptable.utils.decode(65001, [0xf0,0x9f,0x8d,0xa3]); // 🍣

var sbuf = cptable.utils.encode(65001, sushi);

```

`cptable.utils.encode(CP, data, ofmt)` accepts a String or Array of characters

and returns a representation controlled by `ofmt`:

- Default output is a Buffer (or Array) of bytes (integers between 0 and 255)

- If `ofmt == 'str'`, return a binary String (byte `i` is `o.charCodeAt(i)`)

- If `ofmt == 'arr'`, return an Array of bytes

`cptable.utils.decode(CP, data)` accepts a byte String or Array of numbers or

Buffer and returns a JS string.

## Known Excel Codepages

A much smaller script, including only the codepages known to be used in Excel,

is available under the name `cpexcel`. It exposes the same variable `cptable`

and is suitable as a drop-in replacement when the full codepage tables are not

needed.

In node:

```js

var cptable = require('codepage/dist/cpexcel.full');

```

## Rolling your own script

The `make.sh` script in the repo can take a manifest and generate JS source.

Usage:

```bash

$ bash make.sh path_to_manifest output_file_name JSVAR

```

where

- `JSVAR` is the name of the exported variable (generally `cptable`)

- `output_file_name` is the output file (`cpexcel.js`, `cptable.js`, ...)

- `path_to_manifest` is the path to the manifest file.

The manifest file is expected to be a CSV with 3 columns:

```

<codepage number>,<source>,<size>

```

If a source is specified, it will try to download the specified file and parse.

The file format is expected to follow the format from the unicode.org site.

The size should be `1` for a single-byte codepage and `2` for a double-byte

codepage. For mixed codepages (which use some single- and some double-byte

codes), the script assumes the mapping is a prefix code and generates efficient

JS code.

Generated scripts only include the mapping. `cat` a mapping with `cputils.js`

to produce a complete script like `cpexcel.full.js`.

## Building the complete script

This script uses [voc](npm.im/voc). The script to build the codepage tables and

the JS source is `codepage.md`, so building involves `voc codepage.md`.

## Generated Codepages

The complete list of codepages can be found in the file `pages.csv`.

Some codepages are easier to implement algorithmically. Since those character

tables are not generated, there is no corresponding entry (they are "magic").

| CP# | Source | Description |

|--------:|:-----------:|:-----------------------------------------------------|

| ` 37` | unicode.org | IBM EBCDIC US-Canada |

| ` 437` | unicode.org | OEM United States |

| ` 500` | unicode.org | IBM EBCDIC International |

| ` 620` | NLS | Mazovia (Polish) MS-DOS |

| ` 708` | Windows 7 | Arabic (ASMO 708) |

| ` 720` | Windows 7 | Arabic (Transparent ASMO); Arabic (DOS) |

| ` 737` | unicode.org | OEM Greek (formerly 437G); Greek (DOS) |

| ` 775` | unicode.org | OEM Baltic; Baltic (DOS) |

| ` 808` | unicode.org | OEM Russian; Cyrillic + Euro symbol |

| ` 850` | unicode.org | OEM Multilingual Latin 1; Western European (DOS) |

| ` 852` | unicode.org | OEM Latin 2; Central European (DOS) |

| ` 855` | unicode.org | OEM Cyrillic (primarily Russian) |

| ` 857` | unicode.org | OEM Turkish; Turkish (DOS) |

| ` 858` | Windows 7 | OEM Multilingual Latin 1 + Euro symbol |

| ` 860` | unicode.org | OEM Portuguese; Portuguese (DOS) |

| ` 861` | unicode.org | OEM Icelandic; Icelandic (DOS) |

| ` 862` | unicode.org | OEM Hebrew; Hebrew (DOS) |

| ` 863` | unicode.org | OEM French Canadian; French Canadian (DOS) |

| ` 864` | unicode.org | OEM Arabic; Arabic (864) |

| ` 865` | unicode.org | OEM Nordic; Nordic (DOS) |

| ` 866` | unicode.org | OEM Russian; Cyrillic (DOS) |

| ` 869` | unicode.org | OEM Modern Greek; Greek, Modern (DOS) |

| ` 870` | Windows 7 | IBM EBCDIC Multilingual/ROECE (Latin 2) |

| ` 872` | unicode.org | OEM Cyrillic (primarily Russian) + Euro Symbol |

| ` 874` | unicode.org | Windows Thai |

| ` 875` | unicode.org | IBM EBCDIC Greek Modern |

| ` 895` | NLS | Kamenický (Czech) MS-DOS |

| ` 932` | unicode.org | Japanese Shift-JIS |

| ` 936` | unicode.org | Simplified Chinese GBK |

| ` 949` | unicode.org | Korean |

| ` 950` | unicode.org | Traditional Chinese Big5 |

| ` 1010` | IBM | IBM EBCDIC French |

| ` 1026` | unicode.org | IBM EBCDIC Turkish (Latin 5) |

| ` 1047` | Windows 7 | IBM EBCDIC Latin 1/Open System |

| ` 1132` | IBM | IBM EBCDIC Lao (1132 / 1133 / 1341) |

| ` 1140` | Windows 7 | IBM EBCDIC US-Canada (037 + Euro symbol) |

| ` 1141` | Windows 7 | IBM EBCDIC Germany (20273 + Euro symbol) |

| ` 1142` | Windows 7 | IBM EBCDIC Denmark-Norway (20277 + Euro symbol) |

| ` 1143` | Windows 7 | IBM EBCDIC Finland-Sweden (20278 + Euro symbol) |

| ` 1144` | Windows 7 | IBM EBCDIC Italy (20280 + Euro symbol) |

| ` 1145` | Windows 7 | IBM EBCDIC Latin America-Spain (20284 + Euro symbol) |

| ` 1146` | Windows 7 | IBM EBCDIC United Kingdom (20285 + Euro symbol) |

| ` 1147` | Windows 7 | IBM EBCDIC France (20297 + Euro symbol) |

| ` 1148` | Windows 7 | IBM EBCDIC International (500 + Euro symbol) |

| ` 1149` | Windows 7 | IBM EBCDIC Icelandic (20871 + Euro symbol) |

| ` 1200` | magic | Unicode UTF-16, little endian (BMP of ISO 10646) |

| ` 1201` | magic | Unicode UTF-16, big endian |

| ` 1250` | unicode.org | Windows Central Europe |

| ` 1251` | unicode.org | Windows Cyrillic |

| ` 1252` | unicode.org | Windows Latin I |

| ` 1253` | unicode.org | Windows Greek |

| ` 1254` | unicode.org | Windows Turkish |

| ` 1255` | unicode.org | Windows Hebrew |

| ` 1256` | unicode.org | Windows Arabic |

| ` 1257` | unicode.org | Windows Baltic |

| ` 1258` | unicode.org | Windows Vietnam |

| ` 1361` | Windows 7 | Korean (Johab) |

| `10000` | unicode.org | MAC Roman |

| `10001` | Windows 7 | Japanese (Mac) |

| `10002` | Windows 7 | MAC Traditional Chinese (Big5) |

| `10003` | Windows 7 | Korean (Mac) |

| `10004` | Windows 7 | Arabic (Mac) |

| `10005` | Windows 7 | Hebrew (Mac) |

| `10006` | unicode.org | Greek (Mac) |

| `10007` | unicode.org | Cyrillic (Mac) |

| `10008` | Windows 7 | MAC Simplified Chinese (GB 2312) |

| `10010` | Windows 7 | Romanian (Mac) |

| `10017` | Windows 7 | Ukrainian (Mac) |

| `10021` | Windows 7 | Thai (Mac) |

| `10029` | unicode.org | MAC Latin 2 (Central European) |

| `10079` | unicode.org | Icelandic (Mac) |

| `10081` | unicode.org | Turkish (Mac) |

| `10082` | Windows 7 | Croatian (Mac) |

| `12000` | magic | Unicode UTF-32, little endian byte order |

| `12001` | magic | Unicode UTF-32, big endian byte order |

| `20000` | Windows 7 | CNS Taiwan (Chinese Traditional) |

| `20001` | Windows 7 | TCA Taiwan |

| `20002` | Windows 7 | ETEN Taiwan (Chinese Traditional) |

| `20003` | Windows 7 | IBM5550 Taiwan |

| `20004` | Windows 7 | TeleText Taiwan |

| `20005` | Windows 7 | Wang Taiwan |

| `20105` | Windows 7 | Western European IA5 (IRV International Alphabet 5) |

| `20106` | Windows 7 | IA5 German (7-bit) |

| `20107` | Windows 7 | IA5 Swedish (7-bit) |

| `20108` | Windows 7 | IA5 Norwegian (7-bit) |

| `20127` | magic | US-ASCII (7-bit) |

| `20261` | Windows 7 | T.61 |

| `20269` | Windows 7 | ISO 6937 Non-Spacing Accent |

| `20273` | Windows 7 | IBM EBCDIC Germany |

| `20277` | Windows 7 | IBM EBCDIC Denmark-Norway |

| `20278` | Windows 7 | IBM EBCDIC Finland-Sweden |

| `20280` | Windows 7 | IBM EBCDIC Italy |

| `20284` | Windows 7 | IBM EBCDIC Latin America-Spain |

| `20285` | Windows 7 | IBM EBCDIC United Kingdom |

| `20290` | Windows 7 | IBM EBCDIC Japanese Katakana Extended |

| `20297` | Windows 7 | IBM EBCDIC France |

| `20420` | Windows 7 | IBM EBCDIC Arabic |

| `20423` | Windows 7 | IBM EBCDIC Greek |

| `20424` | Windows 7 | IBM EBCDIC Hebrew |

| `20833` | Windows 7 | IBM EBCDIC Korean Extended |

| `20838` | Windows 7 | IBM EBCDIC Thai |

| `20866` | Windows 7 | Russian Cyrillic (KOI8-R) |

| `20871` | Windows 7 | IBM EBCDIC Icelandic |

| `20880` | Windows 7 | IBM EBCDIC Cyrillic Russian |

| `20905` | Windows 7 | IBM EBCDIC Turkish |

| `20924` | Windows 7 | IBM EBCDIC Latin 1/Open System (1047 + Euro symbol) |

| `20932` | Windows 7 | Japanese (JIS 0208-1990 and 0212-1990) |

| `20936` | Windows 7 | Simplified Chinese (GB2312-80) |

| `20949` | Windows 7 | Korean Wansung |

| `21025` | Windows 7 | IBM EBCDIC Cyrillic Serbian-Bulgarian |

| `21027` | NLS | Extended/Ext Alpha Lowercase |

| `21866` | Windows 7 | Ukrainian Cyrillic (KOI8-U) |

| `28591` | unicode.org | ISO 8859-1 Latin 1 (Western European) |

| `28592` | unicode.org | ISO 8859-2 Latin 2 (Central European) |

| `28593` | unicode.org | ISO 8859-3 Latin 3 |

| `28594` | unicode.org | ISO 8859-4 Baltic |

| `28595` | unicode.org | ISO 8859-5 Cyrillic |

| `28596` | unicode.org | ISO 8859-6 Arabic |

| `28597` | unicode.org | ISO 8859-7 Greek |

| `28598` | unicode.org | ISO 8859-8 Hebrew (ISO-Visual) |

| `28599` | unicode.org | ISO 8859-9 Turkish |

| `28600` | unicode.org | ISO 8859-10 Latin 6 |

| `28601` | unicode.org | ISO 8859-11 Latin (Thai) |

| `28603` | unicode.org | ISO 8859-13 Latin 7 (Estonian) |

| `28604` | unicode.org | ISO 8859-14 Latin 8 (Celtic) |

| `28605` | unicode.org | ISO 8859-15 Latin 9 |

| `28606` | unicode.org | ISO 8859-15 Latin 10 |

| `29001` | Windows 7 | Europa 3 |

| `38598` | Windows 7 | ISO 8859-8 Hebrew (ISO-Logical) |

| `47451` | unicode.org | Atari ST/TT |

| `50220` | magic | ISO 2022 JIS Japanese with no halfwidth Katakana |

| `50221` | magic | ISO 2022 JIS Japanese with halfwidth Katakana |

| `50222` | magic | ISO 2022 Japanese JIS X 0201-1989 (1 byte Kana-SO/SI)|

| `50225` | magic | ISO 2022 Korean |

| `50227` | magic | ISO 2022 Simplified Chinese |

| `51932` | Windows 7 | EUC Japanese |

| `51936` | Windows 7 | EUC Simplified Chinese |

| `51949` | Windows 7 | EUC Korean |

| `52936` | Windows 7 | HZ-GB2312 Simplified Chinese |

| `54936` | Windows 7 | GB18030 Simplified Chinese (4 byte) |

| `57002` | Windows 7 | ISCII Devanagari |

| `57003` | Windows 7 | ISCII Bengali |

| `57004` | Windows 7 | ISCII Tamil |

| `57005` | Windows 7 | ISCII Telugu |

| `57006` | Windows 7 | ISCII Assamese |

| `57007` | Windows 7 | ISCII Oriya |

| `57008` | Windows 7 | ISCII Kannada |

| `57009` | Windows 7 | ISCII Malayalam |

| `57010` | Windows 7 | ISCII Gujarati |

| `57011` | Windows 7 | ISCII Punjabi |

| `65000` | magic | Unicode (UTF-7) |

| `65001` | magic | Unicode (UTF-8) |

`unicode.org` refers to the Unicode Consortium Public Mappings, a database of

various mappings between Unicode characters and respective character sets. The

tables are processed by a few scripts in the build process.

`IBM` refers to the IBM coded character set database. Even though IBM uses a

different numbering scheme from Windows, the IBM numbers are used when there is

no conflict. The tables are manually generated from the symbol manifests.

`Windows 7` refers to direct inspection of Windows 7 machines using .NET class

`System.Text.Encoding`. The enclosed `MakeEncoding.cs` C# program brute-forces

code pages. `MakeEncoding.cs` deviates from unicode.org in some cases. When they

map a given code to different characters, unicode.org value is used. When

unicode.org does not prescribe a value, `MakeEncoding.cs` value is used.

`NLS` refers to the National Language Support files supplied in various versions

of Windows. In older versions of Windows (like Windows 98) these files followed

the name pattern `CP_#.NLS`, but newer versions use the name pattern `C_#.NLS`.

## Testing

`make test` will run the nodejs-based test.

To run the in-browser tests, run a local server and go to the `ctest` directory.

`make ctestserv` will start a python `SimpleHTTPServer` server on port 8000.

To update the browser artifacts, run `make ctest`.

## Sources

- [Unicode Consortium Public Mappings](http://www.unicode.org/Public/MAPPINGS/)

- [Windows Code Page Enumeration](http://msdn.microsoft.com/en-us/library/cc195051.aspx)

- [Windows Code Page Identifiers](http://msdn.microsoft.com/en-us/library/windows/desktop/dd317756.aspx)

- [IBM Coded Character Sets](https://www-01.ibm.com/software/globalization/ccsid/ccsid_registered.html)

- [ISO/IEC 2022 / ECMA-35](https://www.ecma-international.org/publications/files/ECMA-ST/Ecma-035.pdf)

- [International Register of Coded Character Sets To Be Used With Escape Sequences](https://www.itscj.ipsj.or.jp/itscj_english/iso-ir/ISO-IR.pdf)

- [Japanese Character Encoding for Internet Messages](https://tools.ietf.org/html/rfc1468)

## License

Please consult the attached LICENSE file for details. All rights not explicitly

granted by the Apache 2.0 license are reserved by the Original Author.

## Badges

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[](https://github.com/SheetJS/js-codepage)