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61 lines
1.9 KiB
Markdown
61 lines
1.9 KiB
Markdown
10 months ago
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# minizlib
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A fast zlib stream built on [minipass](http://npm.im/minipass) and
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Node.js's zlib binding.
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This module was created to serve the needs of
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[node-tar](http://npm.im/tar) and
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[minipass-fetch](http://npm.im/minipass-fetch).
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Brotli is supported in versions of node with a Brotli binding.
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## How does this differ from the streams in `require('zlib')`?
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First, there are no convenience methods to compress or decompress a
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buffer. If you want those, use the built-in `zlib` module. This is
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only streams. That being said, Minipass streams to make it fairly easy to
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use as one-liners: `new zlib.Deflate().end(data).read()` will return the
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deflate compressed result.
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This module compresses and decompresses the data as fast as you feed
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it in. It is synchronous, and runs on the main process thread. Zlib
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and Brotli operations can be high CPU, but they're very fast, and doing it
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this way means much less bookkeeping and artificial deferral.
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Node's built in zlib streams are built on top of `stream.Transform`.
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They do the maximally safe thing with respect to consistent
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asynchrony, buffering, and backpressure.
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See [Minipass](http://npm.im/minipass) for more on the differences between
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Node.js core streams and Minipass streams, and the convenience methods
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provided by that class.
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## Classes
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- Deflate
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- Inflate
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- Gzip
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- Gunzip
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- DeflateRaw
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- InflateRaw
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- Unzip
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- BrotliCompress (Node v10 and higher)
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- BrotliDecompress (Node v10 and higher)
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## USAGE
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```js
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const zlib = require('minizlib')
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const input = sourceOfCompressedData()
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const decode = new zlib.BrotliDecompress()
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const output = whereToWriteTheDecodedData()
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input.pipe(decode).pipe(output)
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```
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## REPRODUCIBLE BUILDS
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To create reproducible gzip compressed files across different operating
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systems, set `portable: true` in the options. This causes minizlib to set
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the `OS` indicator in byte 9 of the extended gzip header to `0xFF` for
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'unknown'.
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