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StreamExtensions mit UnitTests versehen

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This commit is contained in:
Andreas Müller
2021-12-19 22:21:05 +01:00
parent 37650db1e1
commit e5b9959d8e
3 changed files with 172 additions and 15 deletions
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47
AMWD.Common/Extensions/StreamExtensions.cs
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@@ -1,27 +1,36 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace AMWD.Common.Extensions
namespace System.IO
{
/// <summary>
/// Provides extension methods for the <see cref="Stream"/>.
/// </summary>
public static class StreamExtensions
{
public static string ReadLine(this Stream stream, Encoding encoding = null, string eol = null)
/// <summary>
/// Reads a line from a <see cref="Stream"/>.
/// </summary>
/// <param name="stream">The stream to read from.</param>
/// <param name="encoding">The encoding to use.</param>
/// <param name="eol">The character determinating a line end.</param>
/// <returns></returns>
public static string ReadLine(this Stream stream, Encoding encoding = null, char? eol = null)
{
if (encoding == null)
encoding = Encoding.Default;
if (eol == null)
eol = Environment.NewLine;
eol = Environment.NewLine.Last();
if (!stream.CanRead)
return null;
var bytes = new List<byte>();
string s;
char ch;
do
{
int result = stream.ReadByte();
@@ -30,37 +39,45 @@ namespace AMWD.Common.Extensions
byte b = (byte)result;
bytes.Add(b);
s = encoding.GetString(new[] { b });
ch = (char)result;
}
while (!eol.Contains(s));
while (ch != eol);
return encoding.GetString(bytes.ToArray()).Trim();
}
public static async Task<string> ReadLineAsync(this Stream stream, Encoding encoding = null, string eol = null, CancellationToken cancellationToken = default)
/// <summary>
/// Reads a line from a <see cref="Stream"/> asynchronous.
/// </summary>
/// <param name="stream">The stream to read from.</param>
/// <param name="encoding">The encoding to use.</param>
/// <param name="eol">The character determinating a line end.</param>
/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
/// <returns></returns>
public static async Task<string> ReadLineAsync(this Stream stream, Encoding encoding = null, char? eol = null, CancellationToken cancellationToken = default)
{
if (encoding == null)
encoding = Encoding.Default;
if (eol == null)
eol = Environment.NewLine;
eol = Environment.NewLine.Last();
if (!stream.CanRead)
return null;
var bytes = new List<byte>();
string s;
char ch;
do
{
byte[] buffer = new byte[1];
int count = await stream.ReadAsync(buffer, 0, buffer.Length);
int count = await stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken);
if (count == 0)
break;
bytes.Add(buffer[0]);
s = encoding.GetString(buffer);
ch = (char)buffer[0];
}
while (!eol.Contains(s));
while (ch != eol);
return encoding.GetString(bytes.ToArray()).Trim();
}