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Zstandard

Zstandard (Zstd) Compression

A fast, real-time compression algorithm by Facebook offering a wide range of speed-vs-ratio tradeoffs.

기술 세부사항

File zstandard reduces storage and transmission size. DEFLATE (used in ZIP and gzip) combines LZ77 dictionary coding with Huffman coding. Brotli (RFC 7932) achieves 15-25% better compression than gzip for text content and is supported by all modern browsers for HTTP compression. Zstandard (zstd) offers tunable compression levels from fast (comparable to lz4) to high (comparable to LZMA). For files already in compressed formats (JPEG, MP3, ZIP), re-compression provides negligible benefit and may slightly increase file size.

예시

```javascript
// Create ZIP archive in browser (using JSZip)
const zip = new JSZip();
zip.file('readme.txt', 'Hello World');
zip.file('data/report.csv', csvContent);

const blob = await zip.generateAsync({
  type: 'blob',
  compression: 'DEFLATE',
  compressionOptions: { level: 6 },
});
saveAs(blob, 'archive.zip');
```

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