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188 lines
7.9 KiB
188 lines
7.9 KiB
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Security.Permissions;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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namespace Net3_Proxy
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{
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public static class Extensions
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{
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public static T GetCustomAttribute<T>(this ParameterInfo element) where T : Attribute
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=> (T)GetCustomAttribute(element, typeof(T));
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public static T GetCustomAttribute<T>(this MethodInfo element) where T : Attribute
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=> (T)GetCustomAttribute(element, typeof(T));
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public static T GetCustomAttribute<T>(this ConstructorInfo element) where T : Attribute
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=> (T)GetCustomAttribute(element, typeof(T));
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public static Attribute GetCustomAttribute(this MemberInfo element, Type attributeType)
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=> Attribute.GetCustomAttribute(element, attributeType);
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public static Attribute GetCustomAttribute(this ConstructorInfo element, Type attributeType)
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=> Attribute.GetCustomAttribute(element, attributeType);
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public static Attribute GetCustomAttribute(this ParameterInfo element, Type attributeType)
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=> Attribute.GetCustomAttribute(element, attributeType);
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public static StringBuilder Clear(this StringBuilder sb)
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=> sb.Remove(0, sb.Length);
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public static bool HasFlag<E>(this E e, E o) where E : Enum
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{
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var ei = Convert.ToUInt64(e);
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var oi = Convert.ToUInt64(o);
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return (ei & oi) == oi;
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}
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}
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public static class DirectoryInfoExtensions
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{
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public static IEnumerable<FileInfo> EnumerateFiles(this DirectoryInfo self)
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{
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return self.EnumerateFiles("*", SearchOption.TopDirectoryOnly);
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}
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public static IEnumerable<FileInfo> EnumerateFiles(this DirectoryInfo self, string searchPattern)
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{
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return self.EnumerateFiles(searchPattern, SearchOption.TopDirectoryOnly);
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}
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public static IEnumerable<FileInfo> EnumerateFiles(this DirectoryInfo self, string searchPattern, SearchOption searchOption)
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{
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if (searchPattern == null)
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{
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throw new ArgumentNullException(nameof(searchPattern));
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}
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return CreateEnumerateFilesIterator(self, searchPattern, searchOption);
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}
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private static IEnumerable<FileInfo> CreateEnumerateFilesIterator(DirectoryInfo self, string searchPattern, SearchOption searchOption)
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{
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foreach (string fileName in Directory.GetFiles(self.FullName, searchPattern, searchOption))
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yield return new FileInfo(fileName);
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yield break;
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}
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}
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public static class StreamExtensions
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{
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[ComVisible(false)]
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[HostProtection(SecurityAction.LinkDemand, ExternalThreading = true)]
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public static Task CopyToAsync(this Stream src, Stream destination) => CopyToAsync(src, destination, 81920);
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[ComVisible(false)]
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[HostProtection(SecurityAction.LinkDemand, ExternalThreading = true)]
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public static Task CopyToAsync(this Stream src, Stream destination, int bufferSize) => CopyToAsync(src, destination, bufferSize, CancellationToken.None);
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[ComVisible(false)]
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[HostProtection(SecurityAction.LinkDemand, ExternalThreading = true)]
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public static Task CopyToAsync(this Stream src, Stream destination, int bufferSize, CancellationToken cancellationToken)
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{
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if (destination == null)
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{
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throw new ArgumentNullException(nameof(destination));
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}
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if (bufferSize <= 0)
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{
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throw new ArgumentOutOfRangeException(nameof(bufferSize), "Positive number required.");
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}
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if (!src.CanRead && !src.CanWrite)
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{
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throw new ObjectDisposedException(null, "Cannot access a closed Stream.");
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}
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if (!destination.CanRead && !destination.CanWrite)
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{
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throw new ObjectDisposedException("destination", "Cannot access a closed Stream.");
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}
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if (!src.CanRead)
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{
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throw new NotSupportedException("Stream does not support reading.");
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}
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if (!destination.CanWrite)
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{
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throw new NotSupportedException("Stream does not support writing.");
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}
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return CopyToAsyncInternal(src, destination, bufferSize, cancellationToken);
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}
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private static async Task CopyToAsyncInternal(Stream src, Stream destination, int bufferSize, CancellationToken cancellationToken)
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{
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byte[] buffer = new byte[bufferSize];
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int bytesRead;
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while ((bytesRead = await src.ReadAsync(buffer, 0, buffer.Length, cancellationToken)) != 0)
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{
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await destination.WriteAsync(buffer, 0, bytesRead, cancellationToken);
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}
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}
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[ComVisible(false)]
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[HostProtection(SecurityAction.LinkDemand, ExternalThreading = true)]
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public static Task<int> ReadAsync(this Stream src, byte[] buffer, int offset, int count)
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{
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return ReadAsync(src, buffer, offset, count, CancellationToken.None);
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}
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[ComVisible(false)]
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[HostProtection(SecurityAction.LinkDemand, ExternalThreading = true)]
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public static Task<int> ReadAsync(this Stream src, byte[] buffer, int offset, int count, CancellationToken cancellationToken)
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{
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if (!cancellationToken.IsCancellationRequested)
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{
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return BeginEndReadAsync(src, buffer, offset, count);
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}
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return new Task<int>(() => 0, cancellationToken);
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}
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private static Task<int> BeginEndReadAsync(Stream src, byte[] buffer, int offset, int count)
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=> Task<int>.Factory.FromAsync(
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(byte[] buffer_, int offset_, int count_, AsyncCallback callback, object state) =>
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src.BeginRead(buffer_, offset_, count_, callback, state),
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(IAsyncResult asyncResult) => src.EndRead(asyncResult),
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buffer,
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offset,
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count,
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new object());
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[ComVisible(false)]
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[HostProtection(SecurityAction.LinkDemand, ExternalThreading = true)]
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public static Task WriteAsync(this Stream src, byte[] buffer, int offset, int count)
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{
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return WriteAsync(src, buffer, offset, count, CancellationToken.None);
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}
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[ComVisible(false)]
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[HostProtection(SecurityAction.LinkDemand, ExternalThreading = true)]
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public static Task WriteAsync(this Stream src, byte[] buffer, int offset, int count, CancellationToken cancellationToken)
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{
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if (!cancellationToken.IsCancellationRequested)
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{
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return BeginEndWriteAsync(src, buffer, offset, count);
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}
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return new Task<int>(() => 0, cancellationToken);
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}
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private static Task BeginEndWriteAsync(Stream src, byte[] buffer, int offset, int count)
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=> Task.Factory.FromAsync(
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(byte[] buffer_, int offset_, int count_, AsyncCallback callback, object state) =>
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src.BeginWrite(buffer_, offset_, count_, callback, state),
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(IAsyncResult asyncResult) => src.EndWrite(asyncResult),
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buffer,
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offset,
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count,
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new object());
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}
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public static class SemaphoreSlimExtesnions
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{ // TODO: finish the WaitAsync members
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/*public static Task WaitAsync(this SemaphoreSlim self)
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{
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return null;
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}*/
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}
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}
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