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website/node_modules/npm/lib/utils/gunzip-maybe.js

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