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bsplit2.js
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bsplit2.js
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/* Copyright (c) Rod Vagg, Licensed under Apache-2.0 */
const { Transform } = require('stream')
function split () {
let overflow = []
const stream = Transform({
transform (chunk, enc, callback) {
let start = 0
for (let i = 0; i < chunk.byteLength; i++) {
if (chunk[i] === 10) { // '\n'
let next = chunk.slice(start, i)
if (overflow.length) {
overflow.push(next)
next = Buffer.concat(overflow)
overflow = []
}
this.push(next)
start = i + 1
}
}
if (start < chunk.length) {
overflow.push(chunk.slice(start))
}
callback()
},
flush (callback) {
if (overflow.length) {
return callback(null, Buffer.concat(overflow))
}
callback()
}
})
stream._readableState.objectMode = true
if (stream._readableState.highWaterMark) {
stream._readableState.highWaterMark = 16
}
return stream
}
module.exports = split