mirror of https://github.com/lukechilds/node.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
25 lines
572 B
25 lines
572 B
8 years ago
|
'use strict'
|
||
|
|
|
||
|
|
const duplex = require('mississippi').duplex
|
||
|
|
const through = require('mississippi').through
|
||
|
|
const zlib = require('zlib')
|
||
|
|
|
||
|
|
function hasGzipHeader (c) {
|
||
|
|
return c[0] === 0x1F && c[1] === 0x8B && c[2] === 0x08
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = gunzip
|
||
|
|
function gunzip () {
|
||
|
|
const stream = duplex()
|
||
|
|
const peeker = through((chunk, enc, cb) => {
|
||
|
|
const newStream = hasGzipHeader(chunk)
|
||
|
|
? zlib.createGunzip()
|
||
|
|
: through()
|
||
|
|
stream.setReadable(newStream)
|
||
|
|
stream.setWritable(newStream)
|
||
|
|
stream.write(chunk)
|
||
|
|
})
|
||
|
|
stream.setWritable(peeker)
|
||
|
|
return stream
|
||
|
|
}
|