Current File : /home/ugotscom/3vfm3/node_modules/spdy-transport/lib/spdy-transport/protocol/base/parser.js
'use strict'
var transport = require('../../../spdy-transport')
var util = require('util')
var utils = require('./').utils
var OffsetBuffer = require('obuf')
var Transform = require('readable-stream').Transform
function Parser (options) {
Transform.call(this, {
readableObjectMode: true
})
this.buffer = new OffsetBuffer()
this.partial = false
this.waiting = 0
this.window = options.window
this.version = null
this.decompress = null
this.dead = false
}
module.exports = Parser
util.inherits(Parser, Transform)
Parser.prototype.error = utils.error
Parser.prototype.kill = function kill () {
this.dead = true
}
Parser.prototype._transform = function transform (data, encoding, cb) {
if (!this.dead) { this.buffer.push(data) }
this._consume(cb)
}
Parser.prototype._consume = function _consume (cb) {
var self = this
function next (err, frame) {
if (err) {
return cb(err)
}
if (Array.isArray(frame)) {
for (var i = 0; i < frame.length; i++) {
self.push(frame[i])
}
} else if (frame) {
self.push(frame)
}
// Consume more packets
if (!sync) {
return self._consume(cb)
}
process.nextTick(function () {
self._consume(cb)
})
}
if (this.dead) {
return cb()
}
if (this.buffer.size < this.waiting) {
// No data at all
if (this.buffer.size === 0) {
return cb()
}
// Partial DATA frame or something that we can process partially
if (this.partial) {
var partial = this.buffer.clone(this.buffer.size)
this.buffer.skip(partial.size)
this.waiting -= partial.size
this.executePartial(partial, next)
return
}
// We shall not do anything until we get all expected data
return cb()
}
var sync = true
var content = this.buffer.clone(this.waiting)
this.buffer.skip(this.waiting)
this.execute(content, next)
sync = false
}
Parser.prototype.setVersion = function setVersion (version) {
this.version = version
this.emit('version', version)
}
Parser.prototype.setCompression = function setCompresion (pair) {
this.decompress = new transport.utils.LockStream(pair.decompress)
}
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