Node.js sequentialReader

node-sequentialReader.js

"use strict";

function sequentialReader(buf) {
  this.buffer = buf;
  this.offset = 0;
}
sequentialReader.prototype.readUInt8 = function () {
  var val = this.buffer.readUInt8(this.offset);
  this.offset++;
  return val;
};
sequentialReader.prototype.readInt8 = function () {
  var val = this.buffer.readInt8(this.offset);
  this.offset++;
  return val;
};
sequentialReader.prototype.readUInt16LE = function () {
  var val = this.buffer.readUInt16LE(this.offset);
  this.offset += 2;
  return val;
};
sequentialReader.prototype.readUInt16BE = function () {
  var val = this.buffer.readUInt16BE(this.offset);
  this.offset += 2;
  return val;
};
sequentialReader.prototype.readInt16LE = function () {
  var val = this.buffer.readInt16LE(this.offset);
  this.offset += 2;
  return val;
};
sequentialReader.prototype.readInt16BE = function () {
  var val = this.buffer.readInt16BE(this.offset);
  this.offset += 2;
  return val;
};
sequentialReader.prototype.readUInt32LE = function () {
  var val = this.buffer.readUInt32LE(this.offset);
  this.offset += 4;
  return val;
};
sequentialReader.prototype.readUInt32BE = function () {
  var val = this.buffer.readUInt32BE(this.offset);
  this.offset += 4;
  return val;
};
sequentialReader.prototype.readInt32LE = function () {
  var val = this.buffer.readInt32LE(this.offset);
  this.offset += 4;
  return val;
};
sequentialReader.prototype.readInt32BE = function () {
  var val = this.buffer.readInt32BE(this.offset);
  this.offset += 4;
  return val;
};
sequentialReader.prototype.readFloatLE = function () {
  var val = this.buffer.readFloatLE(this.offset);
  this.offset += 4;
  return val;
};
sequentialReader.prototype.readFloatBE = function () {
  var val = this.buffer.readFloatBE(this.offset);
  this.offset += 4;
  return val;
};
sequentialReader.prototype.readDoubleLE = function () {
  var val = this.buffer.readDoubleLE(this.offset);
  this.offset += 8;
  return val;
};
sequentialReader.prototype.readBytes = function (size) {
  var copyBuffer = new Buffer(size);
  var val = this.buffer.copy(copyBuffer, this.offset, this.offset + size);
  this.offset += size;
  return copyBuffer;
};
sequentialReader.prototype.readString = function (encoding, size) {
  if (typeof encoding === 'number') {
    size = encoding;
    encoding = 'utf8';
  } else {
    encoding = encoding || 'utf8';
  }
  var val = this.buffer.toString(encoding, this.offset, this.offset + size);
  val = val.replace(/\0/g, '');
  this.offset += size;
  return val;
};
sequentialReader.prototype.slice = function (size) {
  var subBuffer = this.buffer.slice(this.offset, this.offset + size);
  this.offset += size;
  return subBuffer;
};
sequentialReader.prototype.createCopy = function (size) {
  var copyBuffer = new Buffer(size);
  this.buffer.copy(copyBuffer, 0, this.offset, this.offset + size);
  this.offset += size;
  return copyBuffer;
};
sequentialReader.prototype.bufferSize = function (){
  return this.buffer.length;
}

module.exports = sequentialReader;