Kasten

TypeScript toolbox for encoding, decoding, and compression algorithms with no dependencies.

This library is currently in development.

The API can be changed in future release.

Goals

To provide several codec utility with no dependencies and simple API.

Features

Kasten provides several variant of encoding, decoding and compression functionalities for JavaScript.

• Base 64 Encoding/Decoding
  • RFC2045
  • RFC4648
  • RFC4648 (URL)
• Base 32 Encoding/Decoding
  • RFC4648
  • RFC4648 (Hex)
• Base 16 Encoding/Decoding
  • RFC4648
  • AsciiHexDecode (PDF1.7)
• Base 85
  • Ascii85Decode (PDF1.7)
• Run-Length Encoding/Decoding
  • Basic
  • PackBits
  • RunLengthDecode (PDF1.7)

You can uses those features by very simple API. See also Usage section.

Following features are currently working in progress.

Other formats can be added in future.

• Deflate
• Zstd
• Brotli

Usage

Create codec instance with static methods of Kasten.

import { Kasten } from 'kasten-js';

const data: Uint8Array = ...;

const base64 = Kasten.codecs.base64('rfc4648');

const encoded: string = base64.encode(data);

const decoded: Uint8Array = base64.decode(encoded);

const runLength = Kasten.compressors.runLength('pdf');

const compressed = runLength.compress(data);

const decompressed = runLength.decompress(compressed);

If no category specified, returns default implementation.

import { Kasten } from 'kasten-js';

const base16 = Kasten.codecs.base16();

You can get the codec implementations via Kasten.codecs property.

You cant get the compressor implementations via Kasten.compressors property.

All codecs available in Kasten are below.

|Group|Spec|Method|Category|Summary| |:-|:-|:-|:-|:-| |Base 64|RFC2045|Kasten.codecs.base64|rfc-2045|The old Base 64 specification.| |Base 64|RFC4648|Kasten.codecs.base64|rfc-4648|The latest Base 64 specification. It is compatible with Uint8Array.prototype.toBase64.| |Base 64|RFC4648(URL)|Kasten.codecs.base64|rfc-4648-url|The latest Base 64 specification for URL safe encoding. It is compatible with Uint8Array.prototype.toBase64.| |Base 32|RFC4648|Kasten.codecs.base32|rfc-4648|The latest Base 32 specification.| |Base 32|RFC4648 (HEX)|Kasten.codecs.base32|rfc-4648-hex|The latest Base 32 specification for hexadecimal encoding.| |Base 16|RFC4648|Kasten.codecs.base16|rfc-4648|The latest Base 16 specification.| |Base 16|AsciiHexDecode (PDF1.7)|Kasten.codecs.base16|ascii-hex|The Base 16 specification of PDF1.7.| |Base 85|Ascii85Decode (PDF1.7)|Kasten.codecs.base85|ascii-85|The Base85 specification of PDF1.7.| |Run-Length|Basic|Kasten.compressors.runLength|basic|The basic and old Run-Length encoding.| |Run-Length|PackBits|Kasten.compressors.runLength|pack-bits|The old Run-Length encoding accepted by MacPrint of Apple.| |Run-Length|RunLengthDecode (PDF1.7)|Kasten.compressors.runLength|pdf|The Run-Length specofication of PDF1.7.|

License

This project is licensed under the MIT License.