yenc

yEnc

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!CI

A javascript implementation of yEnc, usable for node and browsers

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yEnc is an encoding method which offers efficient and proper transmission for binaries on the Usenet (or by eMail and other applications).

Other encodings are BASE64, BinHex, UUencode, Quoted Printable, …

yEnc is NOT an audio format (as MP3) or a video format (as AVI, MOV, …) or a picture format (as GIF or JPEG).

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- Overview
- Detailed Documentation
- yEnc Wikipedia
- yEnc website- out of order

Performance Benchmarks

This library includes a benchmark suite (npm run bench) using tinybench to measure encode/decode performance for ASCII, Unicode, and large strings.

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- Benchmarks are run using Node.js v22+ on a modern Mac.
- Each test measures the average operations per second (ops/sec) for encoding and decoding various string types and sizes.
- The benchmark script is located at bench.ts and can be run with npm run bench.

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| Operation | Before Optimization | After Optimization | Change |
|-------------------|--------------------|-------------------|-----------|
| encode (ascii) | 939,753 ops/sec | 949,856 ops/sec | +1% |
| decode (ascii) | 3,131,047 ops/sec | 3,193,687 ops/sec | +2% |
| encode (unicode) | 881,131 ops/sec | 911,317 ops/sec | +3% |
| decode (unicode) | 2,583,784 ops/sec | 2,674,569 ops/sec | +4% |
| encode (large) | 2,276 ops/sec | 2,382 ops/sec | +5% |
| decode (large) | 6,857 ops/sec | 6,972 ops/sec | +2% |

Key optimizations:
- Switched from array join to string concatenation for encode (faster for both small and large strings in JS engines)
- Used a Set for reserved character lookup (faster than Array.indexOf)
- Removed unnecessary function call overhead in tight loops

How to run benchmarks:
``sh
npm run bench
`

Interpretation:
- The library is highly performant for both ASCII and Unicode data.
- Encoding and decoding large strings is efficient and scales well.
- All optimizations are validated by a comprehensive test suite (npm test`).