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express-server/node_modules/packet-reader/index.js

@@ -0,0 +1,65 @@
+var assert = require('assert')
+
+var Reader = module.exports = function(options) {
+  //TODO - remove for version 1.0
+  if(typeof options == 'number') {
+    options = { headerSize: options }
+  }
+  options = options || {}
+  this.offset = 0
+  this.lastChunk = false
+  this.chunk = null
+  this.chunkLength = 0
+  this.headerSize = options.headerSize || 0
+  this.lengthPadding = options.lengthPadding || 0
+  this.header = null
+  assert(this.headerSize < 2, 'pre-length header of more than 1 byte length not currently supported')
+}
+
+Reader.prototype.addChunk = function(chunk) {
+  if (!this.chunk || this.offset === this.chunkLength) {
+    this.chunk = chunk
+    this.chunkLength = chunk.length
+    this.offset = 0
+    return
+  }
+
+  var newChunkLength = chunk.length
+  var newLength = this.chunkLength + newChunkLength
+
+  if (newLength > this.chunk.length) {
+    var newBufferLength = this.chunk.length * 2
+    while (newLength >= newBufferLength) {
+      newBufferLength *= 2
+    }
+    var newBuffer = new Buffer(newBufferLength)
+    this.chunk.copy(newBuffer)
+    this.chunk = newBuffer
+  }
+  chunk.copy(this.chunk, this.chunkLength)
+  this.chunkLength = newLength
+}
+
+Reader.prototype.read = function() {
+  if(this.chunkLength < (this.headerSize + 4 + this.offset)) {
+    return false
+  }
+
+  if(this.headerSize) {
+    this.header = this.chunk[this.offset]
+  }
+
+  //read length of next item
+  var length = this.chunk.readUInt32BE(this.offset + this.headerSize) + this.lengthPadding
+
+  //next item spans more chunks than we have
+  var remaining = this.chunkLength - (this.offset + 4 + this.headerSize)
+  if(length > remaining) {
+    return false
+  }
+
+  this.offset += (this.headerSize + 4)
+  var result = this.chunk.slice(this.offset, this.offset + length)
+  this.offset += length
+  return result
+}