This project is part of the @thi.ng/umbrella monorepo.

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Binary Bencode encoder (currently no decoding yet) for structured data.

Will be converted to 0 or 1.

All JS strings will be UTF-8 encoded. To write raw bytes without transformation, wrap them as Uint8Array. These too will be written as Bencode strings (e.g. len:xxx...), but are used as is.

This implementation has optional support for floating point values. If these are not desired (e.g. for compatibility reasons), all numeric values MUST be pre-rounded to integers. The encoder only chooses the custom float encoding iff a number has a fractional part. Floats are encoded similarly to standard ints (i.e. as text), but using f as prefix. Furthermore, only floats with an absolute value in the semi-open [1e-6,1e21) interval can be encoded.

yarn add @thi.ng/bencode

• @thi.ng/api
• @thi.ng/checks
• @thi.ng/defmulti
• @thi.ng/transducers
• @thi.ng/transducers-binary

import { encode } from "@thi.ng/bencode";
import { hexDump } from "@thi.ng/transducers-binary";

[...hexDump({}, encode({ foo: "bar", "baz": [0,1,2,3], "pi": Math.PI }))]
// [ '00000000 | 64 33 3a 62 61 7a 6c 69 30 65 69 31 65 69 32 65 | d3:bazli0ei1ei2e',
//   '00000010 | 69 33 65 65 33 3a 66 6f 6f 33 3a 62 61 72 32 3a | i3ee3:foo3:bar2:',
//   '00000020 | 70 69 66 33 2e 31 34 31 35 39 32 36 35 33 35 38 | pif3.14159265358',
//   '00000030 | 39 37 39 33 65 65 00 00 00 00 00 00 00 00 00 00 | 9793ee..........' ]

// Uin8Array values are written verbatim (as Bencode strings)
[...hexDump({}, encode({ foo: new Uint8Array([0,1,2,3]) }))]
// [ '00000000 | 64 33 3a 66 6f 6f 34 3a 00 01 02 03 65 00 00 00 | d3:foo4:....e...' ]

• Karsten Schmidt

© 2016 Karsten Schmidt // Apache Software License 2.0