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95 lines
3.8 KiB
95 lines
3.8 KiB
//
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// StreamUtility.cs
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//
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// Author: Kees van Spelde <sicos2002@hotmail.com>
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//
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// Copyright (c) 2013-2018 Magic-Sessions. (www.magic-sessions.com)
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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 NON INFRINGEMENT. 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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using System;
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using System.IO;
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using System.Text;
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namespace MsgReader.Helpers
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{
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/// <summary>
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/// Utility to help reading bytes and strings of a <see cref="Stream"/>
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/// </summary>
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internal static class StreamUtility
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{
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#region ReadLineAsBytes
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/// <summary>
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/// Read a line from the stream.
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/// A line is interpreted as all the bytes read until a CRLF or LF is encountered.<br/>
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/// CRLF pair or LF is not included in the string.
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/// </summary>
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/// <param name="stream">The stream from which the line is to be read</param>
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/// <returns>A line read from the stream returned as a byte array or <see langword="null"/> if no bytes were readable from the stream</returns>
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/// <exception cref="ArgumentNullException">If <paramref name="stream"/> is <see langword="null"/></exception>
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public static byte[] ReadLineAsBytes(Stream stream)
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{
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if (stream == null)
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throw new ArgumentNullException(nameof(stream));
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using (var memoryStream = new MemoryStream())
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{
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while (true)
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{
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var justRead = stream.ReadByte();
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if (justRead == -1 && memoryStream.Length > 0)
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break;
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// Check if we started at the end of the stream we read from
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// and we have not read anything from it yet
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if (justRead == -1 && memoryStream.Length == 0)
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return null;
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var readChar = (char) justRead;
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// Do not write \r or \n
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if (readChar != '\r' && readChar != '\n')
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memoryStream.WriteByte((byte) justRead);
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// Last point in CRLF pair
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if (readChar == '\n')
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break;
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}
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return memoryStream.ToArray();
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}
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}
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#endregion
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#region ReadLineAsAscii
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/// <summary>
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/// Read a line from the stream. <see cref="ReadLineAsBytes"/> for more documentation.
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/// </summary>
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/// <param name="stream">The stream to read from</param>
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/// <returns>A line read from the stream or <see langword="null"/> if nothing could be read from the stream</returns>
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/// <exception cref="ArgumentNullException">If <paramref name="stream"/> is <see langword="null"/></exception>
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public static string ReadLineAsAscii(Stream stream)
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{
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var readFromStream = ReadLineAsBytes(stream);
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return readFromStream != null ? Encoding.ASCII.GetString(readFromStream) : null;
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}
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#endregion
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}
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} |