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22 lines
552 B
22 lines
552 B
var duplex = require('mississippi').duplex
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var through = require('mississippi').through
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var zlib = require('zlib')
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function hasGzipHeader (c) {
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return c[0] === 0x1F && c[1] === 0x8B && c[2] === 0x08
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}
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module.exports = gunzip
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function gunzip () {
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var stream = duplex()
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var peeker = through(function (chunk, enc, cb) {
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var newStream = hasGzipHeader(chunk)
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? zlib.createGunzip()
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: through()
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stream.setReadable(newStream)
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stream.setWritable(newStream)
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stream.write(chunk)
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})
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stream.setWritable(peeker)
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return stream
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}
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