| Path : /var/www/html/mertbinici/BusinessBooster/node_modules/postgres-bytea/ |
|
B-Con CMD Config cPanel C-Rdp D-Log Info Jump Mass Ransom Symlink vHost Zone-H |
| Current File : /var/www/html/mertbinici/BusinessBooster/node_modules/postgres-bytea/decoder.js |
'use strict'
const BufferList = require('obuf')
const { Transform } = require('stream')
const State = {
READ_PREFIX: 1,
READ_DATA: 2
}
class ByteaDecoder extends Transform {
constructor () {
super()
this._incomingChunks = new BufferList()
this._state = State.READ_PREFIX
}
_transform (chunk, encoding, callback) {
this._incomingChunks.push(chunk)
while (true) {
if (this._state === State.READ_PREFIX) {
if (this._incomingChunks.has(3)) {
const prefix = this._incomingChunks.take(3)
const prefixString = prefix.toString()
if (prefixString !== '\\\\x') {
return this.emit('error', new Error(`Expected double-escaped postgres bytea hex format prefix, received: '${prefixString}'`))
}
this._state = State.READ_DATA
continue
} else {
break
}
}
if (this._state === State.READ_DATA) {
if (this._incomingChunks.size >= 2) {
// two hex characters are needed to parse a byte. read even number of chars, and let remainder roll over
let evenChunk
const isEvenLength = this._incomingChunks.size % 2 === 0
if (isEvenLength) {
evenChunk = this._incomingChunks.take(this._incomingChunks.size)
} else {
evenChunk = this._incomingChunks.take(this._incomingChunks.size - 1)
}
this.push(Buffer.from(evenChunk.toString(), 'hex'))
}
break
}
}
callback()
}
}
module.exports = ByteaDecoder