#region MIT License
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/**
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* PayloadData.cs
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*
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* The MIT License
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*
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* Copyright (c) 2012 sta.blockhead
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#endregion
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Text;
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namespace WebSocketSharp.Frame
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{
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public class PayloadData : IEnumerable<byte>
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{
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#region Field
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public const ulong MaxLength = long.MaxValue;
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#endregion
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#region Public Constructors
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public PayloadData(string appData)
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: this(Encoding.UTF8.GetBytes(appData))
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{
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}
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public PayloadData(byte[] appData)
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: this(new byte[] { }, appData)
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{
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}
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public PayloadData(byte[] appData, bool masked)
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: this(new byte[] { }, appData, masked)
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{
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}
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public PayloadData(byte[] extData, byte[] appData)
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: this(extData, appData, false)
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{
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}
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public PayloadData(byte[] extData, byte[] appData, bool masked)
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{
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if (extData == null)
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throw new ArgumentNullException("extData");
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if (appData == null)
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throw new ArgumentNullException("appData");
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if ((ulong)extData.LongLength + (ulong)appData.LongLength > MaxLength)
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throw new ArgumentOutOfRangeException("Plus 'extData' length and 'appData' lenght must be less than MaxLength.");
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ExtensionData = extData;
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ApplicationData = appData;
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IsMasked = masked;
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}
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#endregion
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#region Properties
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public byte[] ExtensionData { get; private set; }
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public byte[] ApplicationData { get; private set; }
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public bool IsMasked { get; private set; }
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public ulong Length
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{
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get
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{
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return (ulong)(ExtensionData.LongLength + ApplicationData.LongLength);
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}
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}
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#endregion
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#region Private Methods
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IEnumerator IEnumerable.GetEnumerator()
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{
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return GetEnumerator();
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}
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private void mask(byte[] src, byte[] key)
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{
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for (long i = 0; i < src.LongLength; i++)
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src[i] = (byte)(src[i] ^ key[i % 4]);
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}
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#endregion
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#region Public Methods
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public IEnumerator<byte> GetEnumerator()
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{
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foreach (byte b in ExtensionData)
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yield return b;
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foreach (byte b in ApplicationData)
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yield return b;
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}
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public void Mask(byte[] maskingKey)
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{
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if (maskingKey == null)
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throw new ArgumentNullException("maskingKey");
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if (maskingKey.Length != 4)
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throw new ArgumentOutOfRangeException("maskingKey", "'maskingKey' length must be 4.");
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if (ExtensionData.LongLength > 0)
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mask(ExtensionData, maskingKey);
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if (ApplicationData.LongLength > 0)
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mask(ApplicationData, maskingKey);
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IsMasked = !IsMasked;
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}
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public byte[] ToBytes()
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{
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if (ExtensionData.LongLength <= 0)
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return ApplicationData;
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var result = new byte[ExtensionData.Length + ApplicationData.Length];
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ExtensionData.CopyTo(result, 0);
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Array.Copy(ApplicationData, 0, result, ExtensionData.Length, ApplicationData.Length);
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return result;
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}
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public override string ToString()
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{
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return BitConverter.ToString(ToBytes());
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}
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#endregion
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}
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}
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