mirror of https://github.com/jkjoy/sunpeiwen.git
29 lines
887 B
Markdown
29 lines
887 B
Markdown
# minipass-sized
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A Minipass stream that raises an error if you get a different number of
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bytes than expected.
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## USAGE
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Use just like any old [minipass](http://npm.im/minipass) stream, but
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provide a `size` option to the constructor.
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The `size` option must be a positive integer, smaller than
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`Number.MAX_SAFE_INTEGER`.
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```js
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const MinipassSized = require('minipass-sized')
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// figure out how much data you expect to get
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const expectedSize = +headers['content-length']
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const stream = new MinipassSized({ size: expectedSize })
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stream.on('error', er => {
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// if it's the wrong size, then this will raise an error with
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// { found: <number>, expect: <number>, code: 'EBADSIZE' }
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})
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response.pipe(stream)
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```
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Caveats: this does not work with `objectMode` streams, and will throw a
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`TypeError` from the constructor if the size argument is missing or
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invalid.
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