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351 lines
19 KiB
351 lines
19 KiB
# js-codepage
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[Codepages](https://en.wikipedia.org/wiki/Codepage) are character encodings. In
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many contexts, single- or double-byte character sets are used in lieu of Unicode
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encodings. The codepages map between characters and numbers.
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## Setup
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In node:
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```js
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var cptable = require('codepage');
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```
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In the browser:
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```html
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<script src="cptable.js"></script>
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<script src="cputils.js"></script>
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```
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Alternatively, use the full version in the dist folder:
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```html
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<script src="cptable.full.js"></script>
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```
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The complete set of codepages is large due to some Double Byte Character Set
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encodings. A much smaller file that only includes SBCS codepages is provided in
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this repo (`sbcs.js`), as well as a file for other projects (`cpexcel.js`)
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If you know which codepages you need, you can include individual scripts for
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each codepage. The individual files are provided in the `bits/` directory.
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For example, to include only the Mac codepages:
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```html
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<script src="bits/10000.js"></script>
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<script src="bits/10006.js"></script>
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<script src="bits/10007.js"></script>
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<script src="bits/10029.js"></script>
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<script src="bits/10079.js"></script>
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<script src="bits/10081.js"></script>
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```
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All of the browser scripts define and append to the `cptable` object. To rename
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the object, edit the `JSVAR` shell variable in `make.sh` and run the script.
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The utilities functions are contained in `cputils.js`, which assumes that the
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appropriate codepage scripts were loaded.
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The script will manipulate `module.exports` if available . This is not always
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desirable. To prevent the behavior, define `DO_NOT_EXPORT_CODEPAGE`.
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## Usage
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Most codepages are indexed by number. To get the Unicode character for a given
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codepoint, use the `dec` property:
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```js
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var unicode_cp10000_255 = cptable[10000].dec[255]; // ˇ
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```
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To get the codepoint for a given character, use the `enc` property:
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```js
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var cp10000_711 = cptable[10000].enc[String.fromCharCode(711)]; // 255
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```
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There are a few utilities that deal with strings and buffers:
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```js
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var 汇总 = cptable.utils.decode(936, [0xbb,0xe3,0xd7,0xdc]);
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var buf = cptable.utils.encode(936, 汇总);
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var sushi= cptable.utils.decode(65001, [0xf0,0x9f,0x8d,0xa3]); // 🍣
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var sbuf = cptable.utils.encode(65001, sushi);
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```
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`cptable.utils.encode(CP, data, ofmt)` accepts a String or Array of characters
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and returns a representation controlled by `ofmt`:
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- Default output is a Buffer (or Array) of bytes (integers between 0 and 255)
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- If `ofmt == 'str'`, return a binary String (byte `i` is `o.charCodeAt(i)`)
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- If `ofmt == 'arr'`, return an Array of bytes
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`cptable.utils.decode(CP, data)` accepts a byte String or Array of numbers or
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Buffer and returns a JS string.
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## Known Excel Codepages
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A much smaller script, including only the codepages known to be used in Excel,
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is available under the name `cpexcel`. It exposes the same variable `cptable`
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and is suitable as a drop-in replacement when the full codepage tables are not
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needed.
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In node:
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```js
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var cptable = require('codepage/dist/cpexcel.full');
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```
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## Rolling your own script
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The `make.sh` script in the repo can take a manifest and generate JS source.
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Usage:
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```bash
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$ bash make.sh path_to_manifest output_file_name JSVAR
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```
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where
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- `JSVAR` is the name of the exported variable (generally `cptable`)
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- `output_file_name` is the output file (`cpexcel.js`, `cptable.js`, ...)
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- `path_to_manifest` is the path to the manifest file.
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The manifest file is expected to be a CSV with 3 columns:
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```
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<codepage number>,<source>,<size>
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```
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If a source is specified, it will try to download the specified file and parse.
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The file format is expected to follow the format from the unicode.org site.
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The size should be `1` for a single-byte codepage and `2` for a double-byte
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codepage. For mixed codepages (which use some single- and some double-byte
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codes), the script assumes the mapping is a prefix code and generates efficient
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JS code.
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Generated scripts only include the mapping. `cat` a mapping with `cputils.js`
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to produce a complete script like `cpexcel.full.js`.
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## Building the complete script
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This script uses [voc](npm.im/voc). The script to build the codepage tables and
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the JS source is `codepage.md`, so building involves `voc codepage.md`.
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## Generated Codepages
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The complete list of codepages can be found in the file `pages.csv`.
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Some codepages are easier to implement algorithmically. Since those character
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tables are not generated, there is no corresponding entry (they are "magic").
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| CP# | Source | Description |
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|--------:|:-----------:|:-----------------------------------------------------|
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| ` 37` | unicode.org | IBM EBCDIC US-Canada |
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| ` 437` | unicode.org | OEM United States |
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| ` 500` | unicode.org | IBM EBCDIC International |
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| ` 620` | NLS | Mazovia (Polish) MS-DOS |
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| ` 708` | Windows 7 | Arabic (ASMO 708) |
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| ` 720` | Windows 7 | Arabic (Transparent ASMO); Arabic (DOS) |
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| ` 737` | unicode.org | OEM Greek (formerly 437G); Greek (DOS) |
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| ` 775` | unicode.org | OEM Baltic; Baltic (DOS) |
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| ` 808` | unicode.org | OEM Russian; Cyrillic + Euro symbol |
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| ` 850` | unicode.org | OEM Multilingual Latin 1; Western European (DOS) |
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| ` 852` | unicode.org | OEM Latin 2; Central European (DOS) |
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| ` 855` | unicode.org | OEM Cyrillic (primarily Russian) |
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| ` 857` | unicode.org | OEM Turkish; Turkish (DOS) |
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| ` 858` | Windows 7 | OEM Multilingual Latin 1 + Euro symbol |
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| ` 860` | unicode.org | OEM Portuguese; Portuguese (DOS) |
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| ` 861` | unicode.org | OEM Icelandic; Icelandic (DOS) |
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| ` 862` | unicode.org | OEM Hebrew; Hebrew (DOS) |
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| ` 863` | unicode.org | OEM French Canadian; French Canadian (DOS) |
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| ` 864` | unicode.org | OEM Arabic; Arabic (864) |
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| ` 865` | unicode.org | OEM Nordic; Nordic (DOS) |
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| ` 866` | unicode.org | OEM Russian; Cyrillic (DOS) |
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| ` 869` | unicode.org | OEM Modern Greek; Greek, Modern (DOS) |
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| ` 870` | Windows 7 | IBM EBCDIC Multilingual/ROECE (Latin 2) |
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| ` 872` | unicode.org | OEM Cyrillic (primarily Russian) + Euro Symbol |
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| ` 874` | unicode.org | Windows Thai |
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| ` 875` | unicode.org | IBM EBCDIC Greek Modern |
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| ` 895` | NLS | Kamenický (Czech) MS-DOS |
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| ` 932` | unicode.org | Japanese Shift-JIS |
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| ` 936` | unicode.org | Simplified Chinese GBK |
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| ` 949` | unicode.org | Korean |
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| ` 950` | unicode.org | Traditional Chinese Big5 |
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| ` 1010` | IBM | IBM EBCDIC French |
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| ` 1026` | unicode.org | IBM EBCDIC Turkish (Latin 5) |
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| ` 1047` | Windows 7 | IBM EBCDIC Latin 1/Open System |
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| ` 1132` | IBM | IBM EBCDIC Lao (1132 / 1133 / 1341) |
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| ` 1140` | Windows 7 | IBM EBCDIC US-Canada (037 + Euro symbol) |
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| ` 1141` | Windows 7 | IBM EBCDIC Germany (20273 + Euro symbol) |
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| ` 1142` | Windows 7 | IBM EBCDIC Denmark-Norway (20277 + Euro symbol) |
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| ` 1143` | Windows 7 | IBM EBCDIC Finland-Sweden (20278 + Euro symbol) |
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| ` 1144` | Windows 7 | IBM EBCDIC Italy (20280 + Euro symbol) |
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| ` 1145` | Windows 7 | IBM EBCDIC Latin America-Spain (20284 + Euro symbol) |
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| ` 1146` | Windows 7 | IBM EBCDIC United Kingdom (20285 + Euro symbol) |
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| ` 1147` | Windows 7 | IBM EBCDIC France (20297 + Euro symbol) |
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| ` 1148` | Windows 7 | IBM EBCDIC International (500 + Euro symbol) |
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| ` 1149` | Windows 7 | IBM EBCDIC Icelandic (20871 + Euro symbol) |
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| ` 1200` | magic | Unicode UTF-16, little endian (BMP of ISO 10646) |
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| ` 1201` | magic | Unicode UTF-16, big endian |
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| ` 1250` | unicode.org | Windows Central Europe |
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| ` 1251` | unicode.org | Windows Cyrillic |
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| ` 1252` | unicode.org | Windows Latin I |
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| ` 1253` | unicode.org | Windows Greek |
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| ` 1254` | unicode.org | Windows Turkish |
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| ` 1255` | unicode.org | Windows Hebrew |
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| ` 1256` | unicode.org | Windows Arabic |
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| ` 1257` | unicode.org | Windows Baltic |
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| ` 1258` | unicode.org | Windows Vietnam |
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| ` 1361` | Windows 7 | Korean (Johab) |
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| `10000` | unicode.org | MAC Roman |
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| `10001` | Windows 7 | Japanese (Mac) |
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| `10002` | Windows 7 | MAC Traditional Chinese (Big5) |
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| `10003` | Windows 7 | Korean (Mac) |
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| `10004` | Windows 7 | Arabic (Mac) |
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| `10005` | Windows 7 | Hebrew (Mac) |
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| `10006` | unicode.org | Greek (Mac) |
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| `10007` | unicode.org | Cyrillic (Mac) |
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| `10008` | Windows 7 | MAC Simplified Chinese (GB 2312) |
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| `10010` | Windows 7 | Romanian (Mac) |
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| `10017` | Windows 7 | Ukrainian (Mac) |
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| `10021` | Windows 7 | Thai (Mac) |
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| `10029` | unicode.org | MAC Latin 2 (Central European) |
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| `10079` | unicode.org | Icelandic (Mac) |
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| `10081` | unicode.org | Turkish (Mac) |
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| `10082` | Windows 7 | Croatian (Mac) |
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| `12000` | magic | Unicode UTF-32, little endian byte order |
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| `12001` | magic | Unicode UTF-32, big endian byte order |
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| `20000` | Windows 7 | CNS Taiwan (Chinese Traditional) |
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| `20001` | Windows 7 | TCA Taiwan |
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| `20002` | Windows 7 | ETEN Taiwan (Chinese Traditional) |
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| `20003` | Windows 7 | IBM5550 Taiwan |
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| `20004` | Windows 7 | TeleText Taiwan |
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| `20005` | Windows 7 | Wang Taiwan |
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| `20105` | Windows 7 | Western European IA5 (IRV International Alphabet 5) |
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| `20106` | Windows 7 | IA5 German (7-bit) |
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| `20107` | Windows 7 | IA5 Swedish (7-bit) |
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| `20108` | Windows 7 | IA5 Norwegian (7-bit) |
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| `20127` | magic | US-ASCII (7-bit) |
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| `20261` | Windows 7 | T.61 |
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| `20269` | Windows 7 | ISO 6937 Non-Spacing Accent |
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| `20273` | Windows 7 | IBM EBCDIC Germany |
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| `20277` | Windows 7 | IBM EBCDIC Denmark-Norway |
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| `20278` | Windows 7 | IBM EBCDIC Finland-Sweden |
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| `20280` | Windows 7 | IBM EBCDIC Italy |
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| `20284` | Windows 7 | IBM EBCDIC Latin America-Spain |
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| `20285` | Windows 7 | IBM EBCDIC United Kingdom |
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| `20290` | Windows 7 | IBM EBCDIC Japanese Katakana Extended |
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| `20297` | Windows 7 | IBM EBCDIC France |
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| `20420` | Windows 7 | IBM EBCDIC Arabic |
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| `20423` | Windows 7 | IBM EBCDIC Greek |
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| `20424` | Windows 7 | IBM EBCDIC Hebrew |
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| `20833` | Windows 7 | IBM EBCDIC Korean Extended |
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| `20838` | Windows 7 | IBM EBCDIC Thai |
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| `20866` | Windows 7 | Russian Cyrillic (KOI8-R) |
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| `20871` | Windows 7 | IBM EBCDIC Icelandic |
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| `20880` | Windows 7 | IBM EBCDIC Cyrillic Russian |
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| `20905` | Windows 7 | IBM EBCDIC Turkish |
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| `20924` | Windows 7 | IBM EBCDIC Latin 1/Open System (1047 + Euro symbol) |
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| `20932` | Windows 7 | Japanese (JIS 0208-1990 and 0212-1990) |
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| `20936` | Windows 7 | Simplified Chinese (GB2312-80) |
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| `20949` | Windows 7 | Korean Wansung |
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| `21025` | Windows 7 | IBM EBCDIC Cyrillic Serbian-Bulgarian |
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| `21027` | NLS | Extended/Ext Alpha Lowercase |
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| `21866` | Windows 7 | Ukrainian Cyrillic (KOI8-U) |
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| `28591` | unicode.org | ISO 8859-1 Latin 1 (Western European) |
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| `28592` | unicode.org | ISO 8859-2 Latin 2 (Central European) |
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| `28593` | unicode.org | ISO 8859-3 Latin 3 |
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| `28594` | unicode.org | ISO 8859-4 Baltic |
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| `28595` | unicode.org | ISO 8859-5 Cyrillic |
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| `28596` | unicode.org | ISO 8859-6 Arabic |
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| `28597` | unicode.org | ISO 8859-7 Greek |
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| `28598` | unicode.org | ISO 8859-8 Hebrew (ISO-Visual) |
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| `28599` | unicode.org | ISO 8859-9 Turkish |
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| `28600` | unicode.org | ISO 8859-10 Latin 6 |
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| `28601` | unicode.org | ISO 8859-11 Latin (Thai) |
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| `28603` | unicode.org | ISO 8859-13 Latin 7 (Estonian) |
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| `28604` | unicode.org | ISO 8859-14 Latin 8 (Celtic) |
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| `28605` | unicode.org | ISO 8859-15 Latin 9 |
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| `28606` | unicode.org | ISO 8859-15 Latin 10 |
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| `29001` | Windows 7 | Europa 3 |
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| `38598` | Windows 7 | ISO 8859-8 Hebrew (ISO-Logical) |
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| `47451` | unicode.org | Atari ST/TT |
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| `50220` | magic | ISO 2022 JIS Japanese with no halfwidth Katakana |
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| `50221` | magic | ISO 2022 JIS Japanese with halfwidth Katakana |
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| `50222` | magic | ISO 2022 Japanese JIS X 0201-1989 (1 byte Kana-SO/SI)|
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| `50225` | magic | ISO 2022 Korean |
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| `50227` | magic | ISO 2022 Simplified Chinese |
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| `51932` | Windows 7 | EUC Japanese |
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| `51936` | Windows 7 | EUC Simplified Chinese |
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| `51949` | Windows 7 | EUC Korean |
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| `52936` | Windows 7 | HZ-GB2312 Simplified Chinese |
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| `54936` | Windows 7 | GB18030 Simplified Chinese (4 byte) |
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| `57002` | Windows 7 | ISCII Devanagari |
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| `57003` | Windows 7 | ISCII Bengali |
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| `57004` | Windows 7 | ISCII Tamil |
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| `57005` | Windows 7 | ISCII Telugu |
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| `57006` | Windows 7 | ISCII Assamese |
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| `57007` | Windows 7 | ISCII Oriya |
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| `57008` | Windows 7 | ISCII Kannada |
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| `57009` | Windows 7 | ISCII Malayalam |
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| `57010` | Windows 7 | ISCII Gujarati |
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| `57011` | Windows 7 | ISCII Punjabi |
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| `65000` | magic | Unicode (UTF-7) |
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| `65001` | magic | Unicode (UTF-8) |
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`unicode.org` refers to the Unicode Consortium Public Mappings, a database of
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various mappings between Unicode characters and respective character sets. The
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tables are processed by a few scripts in the build process.
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`IBM` refers to the IBM coded character set database. Even though IBM uses a
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different numbering scheme from Windows, the IBM numbers are used when there is
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no conflict. The tables are manually generated from the symbol manifests.
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`Windows 7` refers to direct inspection of Windows 7 machines using .NET class
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`System.Text.Encoding`. The enclosed `MakeEncoding.cs` C# program brute-forces
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code pages. `MakeEncoding.cs` deviates from unicode.org in some cases. When they
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map a given code to different characters, unicode.org value is used. When
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unicode.org does not prescribe a value, `MakeEncoding.cs` value is used.
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`NLS` refers to the National Language Support files supplied in various versions
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of Windows. In older versions of Windows (like Windows 98) these files followed
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the name pattern `CP_#.NLS`, but newer versions use the name pattern `C_#.NLS`.
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## Testing
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`make test` will run the nodejs-based test.
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To run the in-browser tests, run a local server and go to the `ctest` directory.
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`make ctestserv` will start a python `SimpleHTTPServer` server on port 8000.
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To update the browser artifacts, run `make ctest`.
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## Sources
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- [Unicode Consortium Public Mappings](http://www.unicode.org/Public/MAPPINGS/)
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- [Windows Code Page Enumeration](http://msdn.microsoft.com/en-us/library/cc195051.aspx)
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- [Windows Code Page Identifiers](http://msdn.microsoft.com/en-us/library/windows/desktop/dd317756.aspx)
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- [IBM Coded Character Sets](https://www-01.ibm.com/software/globalization/ccsid/ccsid_registered.html)
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- [ISO/IEC 2022 / ECMA-35](https://www.ecma-international.org/publications/files/ECMA-ST/Ecma-035.pdf)
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- [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)
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- [Japanese Character Encoding for Internet Messages](https://tools.ietf.org/html/rfc1468)
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## License
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Please consult the attached LICENSE file for details. All rights not explicitly
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granted by the Apache 2.0 license are reserved by the Original Author.
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## Badges
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[](https://saucelabs.com/u/codepage)
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[](https://travis-ci.org/SheetJS/js-codepage)
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[](https://coveralls.io/r/SheetJS/js-codepage?branch=master)
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[](https://github.com/SheetJS/js-codepage)
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