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Mini Shell
Mini Shell
/**
* Module dependencies.
*/
var Stream = require('stream').Writable;
var encode = require('./encode');
/**
* Expose parser.
*/
module.exports = Parser;
/**
* Initialize parser.
*
* @param {Options} [opts]
* @api public
*/
function Parser(opts) {
Stream.call(this, opts);
this.state = 'message';
this._lenbuf = new Buffer(4);
}
/**
* Inherit from `Stream.prototype`.
*/
Parser.prototype.__proto__ = Stream.prototype;
/**
* Write implementation.
*/
Parser.prototype._write = function(chunk, encoding, fn){
for (var i = 0; i < chunk.length; i++) {
switch (this.state) {
case 'message':
var meta = chunk[i];
this.version = meta >> 4;
this.argv = meta & 0xf;
this.state = 'arglen';
this._bufs = [new Buffer([meta])];
this._nargs = 0;
this._leni = 0;
break;
case 'arglen':
this._lenbuf[this._leni++] = chunk[i];
// done
if (4 == this._leni) {
this._arglen = this._lenbuf.readUInt32BE(0);
var buf = new Buffer(4);
buf[0] = this._lenbuf[0];
buf[1] = this._lenbuf[1];
buf[2] = this._lenbuf[2];
buf[3] = this._lenbuf[3];
this._bufs.push(buf);
this._argcur = 0;
this.state = 'arg';
}
break;
case 'arg':
// bytes remaining in the argument
var rem = this._arglen - this._argcur;
// consume the chunk we need to complete
// the argument, or the remainder of the
// chunk if it's not mixed-boundary
var pos = Math.min(rem + i, chunk.length);
// slice arg chunk
var part = chunk.slice(i, pos);
this._bufs.push(part);
// check if we have the complete arg
this._argcur += pos - i;
var done = this._argcur == this._arglen;
i = pos - 1;
if (done) this._nargs++;
// no more args
if (this._nargs == this.argv) {
this.state = 'message';
this.emit('data', Buffer.concat(this._bufs));
break;
}
if (done) {
this.state = 'arglen';
this._leni = 0;
}
break;
}
}
fn();
};
Zerion Mini Shell 1.0