cutter
A cutter for head-body buffer.
Many network protocol will use packets composed of a fixed length "head" and a variable length "body", the "data" event emitted by node socket probably not a complete packet, but part of several packets. So this cutter will help to get packets.
Usage
var Cutter = require('cutter');
var net = require('net');
/**
* must return length of head + body
*/
function packetLength(data) {
return 4 + data[0] + (data[1] << 8) + (data[2] << 16);
}
var server = net.createServer(function(socket) {
var cutter = new Cutter(4, packetLength);
cutter.on('packet', function(packet) {
var head = packet.slice(0, 4);
var body = packet.slice(4, packet.length);
});
socket.on('data', function(data) {
cutter.handleData(data);
});
cutter.on('error', function(err) {
console.log(err.stack);
});
});
server.listen(12345);Error Event
When cutter parse packet error, it will emit an error event.
Installation
$ npm install cutter --save
License
The MIT license