1083 lines
38 KiB
C#
1083 lines
38 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.IO;
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using System.IO.Compression;
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using System.Net;
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using System.Text;
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using System.Threading.Tasks;
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using MediaBrowser.Model.Services;
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using SocketHttpListener.Net;
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using HttpListenerResponse = SocketHttpListener.Net.HttpListenerResponse;
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using HttpStatusCode = SocketHttpListener.Net.HttpStatusCode;
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namespace SocketHttpListener
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{
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/// <summary>
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/// Provides a set of static methods for the websocket-sharp.
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/// </summary>
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public static class Ext
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{
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#region Private Const Fields
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private const string _tspecials = "()<>@,;:\\\"/[]?={} \t";
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#endregion
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#region Private Methods
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private static MemoryStream compress(this Stream stream)
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{
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var output = new MemoryStream();
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if (stream.Length == 0)
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return output;
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stream.Position = 0;
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using (var ds = new DeflateStream(output, CompressionMode.Compress, true))
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{
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stream.CopyTo(ds);
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//ds.Close(); // "BFINAL" set to 1.
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output.Position = 0;
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return output;
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}
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}
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private static byte[] decompress(this byte[] value)
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{
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if (value.Length == 0)
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return value;
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using (var input = new MemoryStream(value))
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{
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return input.decompressToArray();
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}
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}
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private static MemoryStream decompress(this Stream stream)
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{
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var output = new MemoryStream();
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if (stream.Length == 0)
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return output;
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stream.Position = 0;
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using (var ds = new DeflateStream(stream, CompressionMode.Decompress, true))
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{
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ds.CopyTo(output, true);
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return output;
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}
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}
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private static byte[] decompressToArray(this Stream stream)
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{
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using (var decomp = stream.decompress())
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{
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return decomp.ToArray();
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}
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}
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private static byte[] readBytes(this Stream stream, byte[] buffer, int offset, int length)
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{
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var len = stream.Read(buffer, offset, length);
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if (len < 1)
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return buffer.SubArray(0, offset);
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var tmp = 0;
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while (len < length)
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{
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tmp = stream.Read(buffer, offset + len, length - len);
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if (tmp < 1)
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break;
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len += tmp;
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}
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return len < length
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? buffer.SubArray(0, offset + len)
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: buffer;
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}
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private static bool readBytes(
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this Stream stream, byte[] buffer, int offset, int length, Stream dest)
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{
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var bytes = stream.readBytes(buffer, offset, length);
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var len = bytes.Length;
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dest.Write(bytes, 0, len);
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return len == offset + length;
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}
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#endregion
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#region Internal Methods
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internal static byte[] Append(this ushort code, string reason)
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{
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using (var buffer = new MemoryStream())
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{
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var tmp = code.ToByteArrayInternally(ByteOrder.Big);
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buffer.Write(tmp, 0, 2);
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if (reason != null && reason.Length > 0)
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{
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tmp = Encoding.UTF8.GetBytes(reason);
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buffer.Write(tmp, 0, tmp.Length);
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}
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return buffer.ToArray();
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}
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}
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internal static string CheckIfClosable(this WebSocketState state)
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{
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return state == WebSocketState.Closing
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? "While closing the WebSocket connection."
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: state == WebSocketState.Closed
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? "The WebSocket connection has already been closed."
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: null;
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}
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internal static string CheckIfOpen(this WebSocketState state)
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{
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return state == WebSocketState.Connecting
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? "A WebSocket connection isn't established."
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: state == WebSocketState.Closing
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? "While closing the WebSocket connection."
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: state == WebSocketState.Closed
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? "The WebSocket connection has already been closed."
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: null;
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}
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internal static string CheckIfValidControlData(this byte[] data, string paramName)
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{
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return data.Length > 125
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? String.Format("'{0}' length must be less.", paramName)
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: null;
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}
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internal static string CheckIfValidSendData(this byte[] data)
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{
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return data == null
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? "'data' must not be null."
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: null;
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}
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internal static string CheckIfValidSendData(this string data)
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{
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return data == null
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? "'data' must not be null."
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: null;
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}
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internal static Stream Compress(this Stream stream, CompressionMethod method)
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{
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return method == CompressionMethod.Deflate
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? stream.compress()
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: stream;
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}
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internal static bool Contains<T>(this IEnumerable<T> source, Func<T, bool> condition)
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{
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foreach (T elm in source)
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if (condition(elm))
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return true;
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return false;
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}
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internal static void CopyTo(this Stream src, Stream dest, bool setDefaultPosition)
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{
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var readLen = 0;
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var bufferLen = 256;
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var buffer = new byte[bufferLen];
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while ((readLen = src.Read(buffer, 0, bufferLen)) > 0)
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{
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dest.Write(buffer, 0, readLen);
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}
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if (setDefaultPosition)
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dest.Position = 0;
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}
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internal static byte[] Decompress(this byte[] value, CompressionMethod method)
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{
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return method == CompressionMethod.Deflate
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? value.decompress()
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: value;
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}
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internal static byte[] DecompressToArray(this Stream stream, CompressionMethod method)
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{
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return method == CompressionMethod.Deflate
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? stream.decompressToArray()
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: stream.ToByteArray();
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}
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/// <summary>
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/// Determines whether the specified <see cref="int"/> equals the specified <see cref="char"/>,
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/// and invokes the specified Action<int> delegate at the same time.
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/// </summary>
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/// <returns>
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/// <c>true</c> if <paramref name="value"/> equals <paramref name="c"/>;
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/// otherwise, <c>false</c>.
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/// </returns>
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/// <param name="value">
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/// An <see cref="int"/> to compare.
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/// </param>
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/// <param name="c">
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/// A <see cref="char"/> to compare.
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/// </param>
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/// <param name="action">
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/// An Action<int> delegate that references the method(s) called at
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/// the same time as comparing. An <see cref="int"/> parameter to pass to
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/// the method(s) is <paramref name="value"/>.
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/// </param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// <paramref name="value"/> isn't between 0 and 255.
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/// </exception>
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internal static bool EqualsWith(this int value, char c, Action<int> action)
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{
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if (value < 0 || value > 255)
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throw new ArgumentOutOfRangeException("value");
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action(value);
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return value == c - 0;
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}
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internal static string GetMessage(this CloseStatusCode code)
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{
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return code == CloseStatusCode.ProtocolError
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? "A WebSocket protocol error has occurred."
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: code == CloseStatusCode.IncorrectData
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? "An incorrect data has been received."
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: code == CloseStatusCode.Abnormal
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? "An exception has occurred."
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: code == CloseStatusCode.InconsistentData
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? "An inconsistent data has been received."
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: code == CloseStatusCode.PolicyViolation
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? "A policy violation has occurred."
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: code == CloseStatusCode.TooBig
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? "A too big data has been received."
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: code == CloseStatusCode.IgnoreExtension
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? "WebSocket client did not receive expected extension(s)."
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: code == CloseStatusCode.ServerError
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? "WebSocket server got an internal error."
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: code == CloseStatusCode.TlsHandshakeFailure
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? "An error has occurred while handshaking."
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: String.Empty;
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}
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internal static string GetNameInternal(this string nameAndValue, string separator)
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{
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var i = nameAndValue.IndexOf(separator);
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return i > 0
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? nameAndValue.Substring(0, i).Trim()
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: null;
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}
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internal static string GetValueInternal(this string nameAndValue, string separator)
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{
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var i = nameAndValue.IndexOf(separator);
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return i >= 0 && i < nameAndValue.Length - 1
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? nameAndValue.Substring(i + 1).Trim()
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: null;
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}
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internal static bool IsCompressionExtension(this string value, CompressionMethod method)
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{
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return value.StartsWith(method.ToExtensionString());
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}
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internal static bool IsPortNumber(this int value)
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{
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return value > 0 && value < 65536;
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}
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internal static bool IsReserved(this ushort code)
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{
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return code == (ushort)CloseStatusCode.Undefined ||
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code == (ushort)CloseStatusCode.NoStatusCode ||
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code == (ushort)CloseStatusCode.Abnormal ||
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code == (ushort)CloseStatusCode.TlsHandshakeFailure;
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}
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internal static bool IsReserved(this CloseStatusCode code)
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{
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return code == CloseStatusCode.Undefined ||
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code == CloseStatusCode.NoStatusCode ||
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code == CloseStatusCode.Abnormal ||
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code == CloseStatusCode.TlsHandshakeFailure;
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}
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internal static bool IsText(this string value)
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{
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var len = value.Length;
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for (var i = 0; i < len; i++)
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{
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char c = value[i];
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if (c < 0x20 && !"\r\n\t".Contains(c))
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return false;
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if (c == 0x7f)
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return false;
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if (c == '\n' && ++i < len)
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{
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c = value[i];
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if (!" \t".Contains(c))
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return false;
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}
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}
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return true;
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}
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internal static bool IsToken(this string value)
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{
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foreach (char c in value)
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if (c < 0x20 || c >= 0x7f || _tspecials.Contains(c))
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return false;
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return true;
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}
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internal static string Quote(this string value)
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{
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return value.IsToken()
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? value
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: String.Format("\"{0}\"", value.Replace("\"", "\\\""));
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}
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internal static byte[] ReadBytes(this Stream stream, int length)
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{
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return stream.readBytes(new byte[length], 0, length);
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}
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internal static byte[] ReadBytes(this Stream stream, long length, int bufferLength)
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{
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using (var result = new MemoryStream())
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{
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var count = length / bufferLength;
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var rem = (int)(length % bufferLength);
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var buffer = new byte[bufferLength];
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var end = false;
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for (long i = 0; i < count; i++)
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{
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if (!stream.readBytes(buffer, 0, bufferLength, result))
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{
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end = true;
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break;
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}
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}
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if (!end && rem > 0)
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stream.readBytes(new byte[rem], 0, rem, result);
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return result.ToArray();
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}
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}
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internal static async Task<byte[]> ReadBytesAsync(this Stream stream, int length)
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{
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var buffer = new byte[length];
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var len = await stream.ReadAsync(buffer, 0, length).ConfigureAwait(false);
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var bytes = len < 1
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? new byte[0]
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: len < length
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? stream.readBytes(buffer, len, length - len)
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: buffer;
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return bytes;
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}
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internal static string RemovePrefix(this string value, params string[] prefixes)
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{
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var i = 0;
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foreach (var prefix in prefixes)
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{
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if (value.StartsWith(prefix))
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{
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i = prefix.Length;
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break;
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}
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}
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return i > 0
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? value.Substring(i)
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: value;
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}
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internal static T[] Reverse<T>(this T[] array)
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{
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var len = array.Length;
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T[] reverse = new T[len];
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var end = len - 1;
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for (var i = 0; i <= end; i++)
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reverse[i] = array[end - i];
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return reverse;
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}
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internal static IEnumerable<string> SplitHeaderValue(
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this string value, params char[] separator)
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{
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var len = value.Length;
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var separators = new string(separator);
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var buffer = new StringBuilder(32);
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var quoted = false;
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var escaped = false;
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char c;
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for (var i = 0; i < len; i++)
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{
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c = value[i];
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if (c == '"')
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{
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if (escaped)
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escaped = !escaped;
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else
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quoted = !quoted;
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}
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else if (c == '\\')
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{
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if (i < len - 1 && value[i + 1] == '"')
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escaped = true;
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}
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else if (separators.Contains(c))
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{
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if (!quoted)
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{
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yield return buffer.ToString();
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buffer.Length = 0;
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continue;
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}
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}
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else {
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}
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buffer.Append(c);
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}
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if (buffer.Length > 0)
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yield return buffer.ToString();
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}
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internal static byte[] ToByteArray(this Stream stream)
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{
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using (var output = new MemoryStream())
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{
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stream.Position = 0;
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stream.CopyTo(output);
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return output.ToArray();
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}
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}
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internal static byte[] ToByteArrayInternally(this ushort value, ByteOrder order)
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{
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var bytes = BitConverter.GetBytes(value);
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if (!order.IsHostOrder())
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Array.Reverse(bytes);
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return bytes;
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}
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internal static byte[] ToByteArrayInternally(this ulong value, ByteOrder order)
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{
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var bytes = BitConverter.GetBytes(value);
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if (!order.IsHostOrder())
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Array.Reverse(bytes);
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return bytes;
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}
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internal static string ToExtensionString(
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this CompressionMethod method, params string[] parameters)
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{
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if (method == CompressionMethod.None)
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return String.Empty;
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var m = String.Format("permessage-{0}", method.ToString().ToLower());
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if (parameters == null || parameters.Length == 0)
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return m;
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return String.Format("{0}; {1}", m, parameters.ToString("; "));
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}
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internal static List<TSource> ToList<TSource>(this IEnumerable<TSource> source)
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{
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return new List<TSource>(source);
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}
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internal static ushort ToUInt16(this byte[] src, ByteOrder srcOrder)
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{
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return BitConverter.ToUInt16(src.ToHostOrder(srcOrder), 0);
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}
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internal static ulong ToUInt64(this byte[] src, ByteOrder srcOrder)
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{
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return BitConverter.ToUInt64(src.ToHostOrder(srcOrder), 0);
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}
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internal static string TrimEndSlash(this string value)
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{
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value = value.TrimEnd('/');
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return value.Length > 0
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? value
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: "/";
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}
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internal static string Unquote(this string value)
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{
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var start = value.IndexOf('\"');
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var end = value.LastIndexOf('\"');
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if (start < end)
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value = value.Substring(start + 1, end - start - 1).Replace("\\\"", "\"");
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return value.Trim();
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}
|
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|
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internal static void WriteBytes(this Stream stream, byte[] value)
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{
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using (var src = new MemoryStream(value))
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{
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src.CopyTo(stream);
|
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}
|
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}
|
|
|
|
#endregion
|
|
|
|
#region Public Methods
|
|
|
|
/// <summary>
|
|
/// Determines whether the specified <see cref="string"/> contains any of characters
|
|
/// in the specified array of <see cref="char"/>.
|
|
/// </summary>
|
|
/// <returns>
|
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/// <c>true</c> if <paramref name="value"/> contains any of <paramref name="chars"/>;
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/// otherwise, <c>false</c>.
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/// </returns>
|
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/// <param name="value">
|
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/// A <see cref="string"/> to test.
|
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/// </param>
|
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/// <param name="chars">
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/// An array of <see cref="char"/> that contains characters to find.
|
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/// </param>
|
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public static bool Contains(this string value, params char[] chars)
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{
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return chars == null || chars.Length == 0
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? true
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|
: value == null || value.Length == 0
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? false
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: value.IndexOfAny(chars) != -1;
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}
|
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|
|
/// <summary>
|
|
/// Determines whether the specified <see cref="QueryParamCollection"/> contains the entry
|
|
/// with the specified <paramref name="name"/>.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// <c>true</c> if <paramref name="collection"/> contains the entry
|
|
/// with <paramref name="name"/>; otherwise, <c>false</c>.
|
|
/// </returns>
|
|
/// <param name="collection">
|
|
/// A <see cref="QueryParamCollection"/> to test.
|
|
/// </param>
|
|
/// <param name="name">
|
|
/// A <see cref="string"/> that represents the key of the entry to find.
|
|
/// </param>
|
|
public static bool Contains(this QueryParamCollection collection, string name)
|
|
{
|
|
return collection == null || collection.Count == 0
|
|
? false
|
|
: collection[name] != null;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Determines whether the specified <see cref="QueryParamCollection"/> contains the entry
|
|
/// with the specified both <paramref name="name"/> and <paramref name="value"/>.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// <c>true</c> if <paramref name="collection"/> contains the entry
|
|
/// with both <paramref name="name"/> and <paramref name="value"/>;
|
|
/// otherwise, <c>false</c>.
|
|
/// </returns>
|
|
/// <param name="collection">
|
|
/// A <see cref="QueryParamCollection"/> to test.
|
|
/// </param>
|
|
/// <param name="name">
|
|
/// A <see cref="string"/> that represents the key of the entry to find.
|
|
/// </param>
|
|
/// <param name="value">
|
|
/// A <see cref="string"/> that represents the value of the entry to find.
|
|
/// </param>
|
|
public static bool Contains(this QueryParamCollection collection, string name, string value)
|
|
{
|
|
if (collection == null || collection.Count == 0)
|
|
return false;
|
|
|
|
var values = collection[name];
|
|
if (values == null)
|
|
return false;
|
|
|
|
foreach (var v in values.Split(','))
|
|
if (v.Trim().Equals(value, StringComparison.OrdinalIgnoreCase))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Emits the specified <see cref="EventHandler"/> delegate if it isn't <see langword="null"/>.
|
|
/// </summary>
|
|
/// <param name="eventHandler">
|
|
/// A <see cref="EventHandler"/> to emit.
|
|
/// </param>
|
|
/// <param name="sender">
|
|
/// An <see cref="object"/> from which emits this <paramref name="eventHandler"/>.
|
|
/// </param>
|
|
/// <param name="e">
|
|
/// A <see cref="EventArgs"/> that contains no event data.
|
|
/// </param>
|
|
public static void Emit(this EventHandler eventHandler, object sender, EventArgs e)
|
|
{
|
|
if (eventHandler != null)
|
|
eventHandler(sender, e);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Emits the specified <c>EventHandler<TEventArgs></c> delegate
|
|
/// if it isn't <see langword="null"/>.
|
|
/// </summary>
|
|
/// <param name="eventHandler">
|
|
/// An <c>EventHandler<TEventArgs></c> to emit.
|
|
/// </param>
|
|
/// <param name="sender">
|
|
/// An <see cref="object"/> from which emits this <paramref name="eventHandler"/>.
|
|
/// </param>
|
|
/// <param name="e">
|
|
/// A <c>TEventArgs</c> that represents the event data.
|
|
/// </param>
|
|
/// <typeparam name="TEventArgs">
|
|
/// The type of the event data generated by the event.
|
|
/// </typeparam>
|
|
public static void Emit<TEventArgs>(
|
|
this EventHandler<TEventArgs> eventHandler, object sender, TEventArgs e)
|
|
where TEventArgs : EventArgs
|
|
{
|
|
if (eventHandler != null)
|
|
eventHandler(sender, e);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the collection of the HTTP cookies from the specified HTTP <paramref name="headers"/>.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// A <see cref="CookieCollection"/> that receives a collection of the HTTP cookies.
|
|
/// </returns>
|
|
/// <param name="headers">
|
|
/// A <see cref="QueryParamCollection"/> that contains a collection of the HTTP headers.
|
|
/// </param>
|
|
/// <param name="response">
|
|
/// <c>true</c> if <paramref name="headers"/> is a collection of the response headers;
|
|
/// otherwise, <c>false</c>.
|
|
/// </param>
|
|
public static CookieCollection GetCookies(this QueryParamCollection headers, bool response)
|
|
{
|
|
var name = response ? "Set-Cookie" : "Cookie";
|
|
return headers == null || !headers.Contains(name)
|
|
? new CookieCollection()
|
|
: CookieHelper.Parse(headers[name], response);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the description of the specified HTTP status <paramref name="code"/>.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// A <see cref="string"/> that represents the description of the HTTP status code.
|
|
/// </returns>
|
|
/// <param name="code">
|
|
/// One of <see cref="HttpStatusCode"/> enum values, indicates the HTTP status codes.
|
|
/// </param>
|
|
public static string GetDescription(this HttpStatusCode code)
|
|
{
|
|
return ((int)code).GetStatusDescription();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the name from the specified <see cref="string"/> that contains a pair of name and
|
|
/// value separated by a separator string.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// A <see cref="string"/> that represents the name if any; otherwise, <c>null</c>.
|
|
/// </returns>
|
|
/// <param name="nameAndValue">
|
|
/// A <see cref="string"/> that contains a pair of name and value separated by a separator
|
|
/// string.
|
|
/// </param>
|
|
/// <param name="separator">
|
|
/// A <see cref="string"/> that represents a separator string.
|
|
/// </param>
|
|
public static string GetName(this string nameAndValue, string separator)
|
|
{
|
|
return (nameAndValue != null && nameAndValue.Length > 0) &&
|
|
(separator != null && separator.Length > 0)
|
|
? nameAndValue.GetNameInternal(separator)
|
|
: null;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the name and value from the specified <see cref="string"/> that contains a pair of
|
|
/// name and value separated by a separator string.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// A <c>KeyValuePair<string, string></c> that represents the name and value if any.
|
|
/// </returns>
|
|
/// <param name="nameAndValue">
|
|
/// A <see cref="string"/> that contains a pair of name and value separated by a separator
|
|
/// string.
|
|
/// </param>
|
|
/// <param name="separator">
|
|
/// A <see cref="string"/> that represents a separator string.
|
|
/// </param>
|
|
public static KeyValuePair<string, string> GetNameAndValue(
|
|
this string nameAndValue, string separator)
|
|
{
|
|
var name = nameAndValue.GetName(separator);
|
|
var value = nameAndValue.GetValue(separator);
|
|
return name != null
|
|
? new KeyValuePair<string, string>(name, value)
|
|
: new KeyValuePair<string, string>(null, null);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the description of the specified HTTP status <paramref name="code"/>.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// A <see cref="string"/> that represents the description of the HTTP status code.
|
|
/// </returns>
|
|
/// <param name="code">
|
|
/// An <see cref="int"/> that represents the HTTP status code.
|
|
/// </param>
|
|
public static string GetStatusDescription(this int code)
|
|
{
|
|
switch (code)
|
|
{
|
|
case 100: return "Continue";
|
|
case 101: return "Switching Protocols";
|
|
case 102: return "Processing";
|
|
case 200: return "OK";
|
|
case 201: return "Created";
|
|
case 202: return "Accepted";
|
|
case 203: return "Non-Authoritative Information";
|
|
case 204: return "No Content";
|
|
case 205: return "Reset Content";
|
|
case 206: return "Partial Content";
|
|
case 207: return "Multi-Status";
|
|
case 300: return "Multiple Choices";
|
|
case 301: return "Moved Permanently";
|
|
case 302: return "Found";
|
|
case 303: return "See Other";
|
|
case 304: return "Not Modified";
|
|
case 305: return "Use Proxy";
|
|
case 307: return "Temporary Redirect";
|
|
case 400: return "Bad Request";
|
|
case 401: return "Unauthorized";
|
|
case 402: return "Payment Required";
|
|
case 403: return "Forbidden";
|
|
case 404: return "Not Found";
|
|
case 405: return "Method Not Allowed";
|
|
case 406: return "Not Acceptable";
|
|
case 407: return "Proxy Authentication Required";
|
|
case 408: return "Request Timeout";
|
|
case 409: return "Conflict";
|
|
case 410: return "Gone";
|
|
case 411: return "Length Required";
|
|
case 412: return "Precondition Failed";
|
|
case 413: return "Request Entity Too Large";
|
|
case 414: return "Request-Uri Too Long";
|
|
case 415: return "Unsupported Media Type";
|
|
case 416: return "Requested Range Not Satisfiable";
|
|
case 417: return "Expectation Failed";
|
|
case 422: return "Unprocessable Entity";
|
|
case 423: return "Locked";
|
|
case 424: return "Failed Dependency";
|
|
case 500: return "Internal Server Error";
|
|
case 501: return "Not Implemented";
|
|
case 502: return "Bad Gateway";
|
|
case 503: return "Service Unavailable";
|
|
case 504: return "Gateway Timeout";
|
|
case 505: return "Http Version Not Supported";
|
|
case 507: return "Insufficient Storage";
|
|
}
|
|
|
|
return String.Empty;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the value from the specified <see cref="string"/> that contains a pair of name and
|
|
/// value separated by a separator string.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// A <see cref="string"/> that represents the value if any; otherwise, <c>null</c>.
|
|
/// </returns>
|
|
/// <param name="nameAndValue">
|
|
/// A <see cref="string"/> that contains a pair of name and value separated by a separator
|
|
/// string.
|
|
/// </param>
|
|
/// <param name="separator">
|
|
/// A <see cref="string"/> that represents a separator string.
|
|
/// </param>
|
|
public static string GetValue(this string nameAndValue, string separator)
|
|
{
|
|
return (nameAndValue != null && nameAndValue.Length > 0) &&
|
|
(separator != null && separator.Length > 0)
|
|
? nameAndValue.GetValueInternal(separator)
|
|
: null;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Determines whether the specified <see cref="ByteOrder"/> is host
|
|
/// (this computer architecture) byte order.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// <c>true</c> if <paramref name="order"/> is host byte order;
|
|
/// otherwise, <c>false</c>.
|
|
/// </returns>
|
|
/// <param name="order">
|
|
/// One of the <see cref="ByteOrder"/> enum values, to test.
|
|
/// </param>
|
|
public static bool IsHostOrder(this ByteOrder order)
|
|
{
|
|
// true : !(true ^ true) or !(false ^ false)
|
|
// false: !(true ^ false) or !(false ^ true)
|
|
return !(BitConverter.IsLittleEndian ^ (order == ByteOrder.Little));
|
|
}
|
|
|
|
/// <summary>
|
|
/// Determines whether the specified <see cref="string"/> is a predefined scheme.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// <c>true</c> if <paramref name="value"/> is a predefined scheme; otherwise, <c>false</c>.
|
|
/// </returns>
|
|
/// <param name="value">
|
|
/// A <see cref="string"/> to test.
|
|
/// </param>
|
|
public static bool IsPredefinedScheme(this string value)
|
|
{
|
|
if (value == null || value.Length < 2)
|
|
return false;
|
|
|
|
var c = value[0];
|
|
if (c == 'h')
|
|
return value == "http" || value == "https";
|
|
|
|
if (c == 'w')
|
|
return value == "ws" || value == "wss";
|
|
|
|
if (c == 'f')
|
|
return value == "file" || value == "ftp";
|
|
|
|
if (c == 'n')
|
|
{
|
|
c = value[1];
|
|
return c == 'e'
|
|
? value == "news" || value == "net.pipe" || value == "net.tcp"
|
|
: value == "nntp";
|
|
}
|
|
|
|
return (c == 'g' && value == "gopher") || (c == 'm' && value == "mailto");
|
|
}
|
|
|
|
/// <summary>
|
|
/// Determines whether the specified <see cref="string"/> is a URI string.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// <c>true</c> if <paramref name="value"/> may be a URI string; otherwise, <c>false</c>.
|
|
/// </returns>
|
|
/// <param name="value">
|
|
/// A <see cref="string"/> to test.
|
|
/// </param>
|
|
public static bool MaybeUri(this string value)
|
|
{
|
|
if (value == null || value.Length == 0)
|
|
return false;
|
|
|
|
var i = value.IndexOf(':');
|
|
if (i == -1)
|
|
return false;
|
|
|
|
if (i >= 10)
|
|
return false;
|
|
|
|
return value.Substring(0, i).IsPredefinedScheme();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Retrieves a sub-array from the specified <paramref name="array"/>.
|
|
/// A sub-array starts at the specified element position.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// An array of T that receives a sub-array, or an empty array of T if any problems
|
|
/// with the parameters.
|
|
/// </returns>
|
|
/// <param name="array">
|
|
/// An array of T that contains the data to retrieve a sub-array.
|
|
/// </param>
|
|
/// <param name="startIndex">
|
|
/// An <see cref="int"/> that contains the zero-based starting position of a sub-array
|
|
/// in <paramref name="array"/>.
|
|
/// </param>
|
|
/// <param name="length">
|
|
/// An <see cref="int"/> that contains the number of elements to retrieve a sub-array.
|
|
/// </param>
|
|
/// <typeparam name="T">
|
|
/// The type of elements in the <paramref name="array"/>.
|
|
/// </typeparam>
|
|
public static T[] SubArray<T>(this T[] array, int startIndex, int length)
|
|
{
|
|
if (array == null || array.Length == 0)
|
|
return new T[0];
|
|
|
|
if (startIndex < 0 || length <= 0)
|
|
return new T[0];
|
|
|
|
if (startIndex + length > array.Length)
|
|
return new T[0];
|
|
|
|
if (startIndex == 0 && array.Length == length)
|
|
return array;
|
|
|
|
T[] subArray = new T[length];
|
|
Array.Copy(array, startIndex, subArray, 0, length);
|
|
|
|
return subArray;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Converts the order of the specified array of <see cref="byte"/> to the host byte order.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// An array of <see cref="byte"/> converted from <paramref name="src"/>.
|
|
/// </returns>
|
|
/// <param name="src">
|
|
/// An array of <see cref="byte"/> to convert.
|
|
/// </param>
|
|
/// <param name="srcOrder">
|
|
/// One of the <see cref="ByteOrder"/> enum values, indicates the byte order of
|
|
/// <paramref name="src"/>.
|
|
/// </param>
|
|
/// <exception cref="ArgumentNullException">
|
|
/// <paramref name="src"/> is <see langword="null"/>.
|
|
/// </exception>
|
|
public static byte[] ToHostOrder(this byte[] src, ByteOrder srcOrder)
|
|
{
|
|
if (src == null)
|
|
throw new ArgumentNullException("src");
|
|
|
|
return src.Length > 1 && !srcOrder.IsHostOrder()
|
|
? src.Reverse()
|
|
: src;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Converts the specified <paramref name="array"/> to a <see cref="string"/> that
|
|
/// concatenates the each element of <paramref name="array"/> across the specified
|
|
/// <paramref name="separator"/>.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// A <see cref="string"/> converted from <paramref name="array"/>,
|
|
/// or <see cref="String.Empty"/> if <paramref name="array"/> is empty.
|
|
/// </returns>
|
|
/// <param name="array">
|
|
/// An array of T to convert.
|
|
/// </param>
|
|
/// <param name="separator">
|
|
/// A <see cref="string"/> that represents the separator string.
|
|
/// </param>
|
|
/// <typeparam name="T">
|
|
/// The type of elements in <paramref name="array"/>.
|
|
/// </typeparam>
|
|
/// <exception cref="ArgumentNullException">
|
|
/// <paramref name="array"/> is <see langword="null"/>.
|
|
/// </exception>
|
|
public static string ToString<T>(this T[] array, string separator)
|
|
{
|
|
if (array == null)
|
|
throw new ArgumentNullException("array");
|
|
|
|
var len = array.Length;
|
|
if (len == 0)
|
|
return String.Empty;
|
|
|
|
if (separator == null)
|
|
separator = String.Empty;
|
|
|
|
var buff = new StringBuilder(64);
|
|
(len - 1).Times(i => buff.AppendFormat("{0}{1}", array[i].ToString(), separator));
|
|
|
|
buff.Append(array[len - 1].ToString());
|
|
return buff.ToString();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Executes the specified <c>Action<int></c> delegate <paramref name="n"/> times.
|
|
/// </summary>
|
|
/// <param name="n">
|
|
/// An <see cref="int"/> is the number of times to execute.
|
|
/// </param>
|
|
/// <param name="action">
|
|
/// An <c>Action<int></c> delegate that references the method(s) to execute.
|
|
/// An <see cref="int"/> parameter to pass to the method(s) is the zero-based count of
|
|
/// iteration.
|
|
/// </param>
|
|
public static void Times(this int n, Action<int> action)
|
|
{
|
|
if (n > 0 && action != null)
|
|
for (int i = 0; i < n; i++)
|
|
action(i);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Converts the specified <see cref="string"/> to a <see cref="Uri"/>.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// A <see cref="Uri"/> converted from <paramref name="uriString"/>, or <see langword="null"/>
|
|
/// if <paramref name="uriString"/> isn't successfully converted.
|
|
/// </returns>
|
|
/// <param name="uriString">
|
|
/// A <see cref="string"/> to convert.
|
|
/// </param>
|
|
public static Uri ToUri(this string uriString)
|
|
{
|
|
Uri res;
|
|
return Uri.TryCreate(
|
|
uriString, uriString.MaybeUri() ? UriKind.Absolute : UriKind.Relative, out res)
|
|
? res
|
|
: null;
|
|
}
|
|
|
|
/// <summary>
|
|
/// URL-decodes the specified <see cref="string"/>.
|
|
/// </summary>
|
|
/// <returns>
|
|
/// A <see cref="string"/> that receives the decoded string, or the <paramref name="value"/>
|
|
/// if it's <see langword="null"/> or empty.
|
|
/// </returns>
|
|
/// <param name="value">
|
|
/// A <see cref="string"/> to decode.
|
|
/// </param>
|
|
public static string UrlDecode(this string value)
|
|
{
|
|
return value == null || value.Length == 0
|
|
? value
|
|
: WebUtility.UrlDecode(value);
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
} |