109 lines
3.5 KiB
C#
109 lines
3.5 KiB
C#
/***************************************************************************
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* FileOperations.cs
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* -------------------
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* begin : May 1, 2002
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* copyright : (C) The RunUO Software Team
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* email : info@runuo.com
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*
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* $Id$
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*
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***************************************************************************/
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/***************************************************************************
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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***************************************************************************/
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using System;
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using System.IO;
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#if !MONO
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using System.Runtime.InteropServices;
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using Microsoft.Win32.SafeHandles;
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#endif
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namespace Server
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{
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public static class FileOperations
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{
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public const int KB = 1024;
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public const int MB = 1024 * KB;
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public static int BufferSize{ get; set; } = 1 * MB;
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public static int Concurrency{ get; set; } = 1;
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public static bool Unbuffered{ get; set; } = true;
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public static bool AreSynchronous => Concurrency < 1;
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public static bool AreAsynchronous => Concurrency > 0;
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public static FileStream OpenSequentialStream(string path, FileMode mode, FileAccess access, FileShare share)
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{
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FileOptions options = FileOptions.SequentialScan;
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if (Concurrency > 0)
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options |= FileOptions.Asynchronous;
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#if MONO
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return new FileStream( path, mode, access, share, BufferSize, options );
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#else
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if (Unbuffered)
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options |= NoBuffering;
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else
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return new FileStream(path, mode, access, share, BufferSize, options);
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SafeFileHandle fileHandle =
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UnsafeNativeMethods.CreateFile(path, (int)access, share, IntPtr.Zero, mode, (int)options, IntPtr.Zero);
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if (fileHandle.IsInvalid) throw new IOException();
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return new UnbufferedFileStream(fileHandle, access, BufferSize, Concurrency > 0);
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#endif
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}
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#if !MONO
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private class UnbufferedFileStream : FileStream
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{
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private SafeFileHandle fileHandle;
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public UnbufferedFileStream(SafeFileHandle fileHandle, FileAccess access, int bufferSize, bool isAsync)
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: base(fileHandle, access, bufferSize, isAsync) =>
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this.fileHandle = fileHandle;
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public override void Write(byte[] array, int offset, int count)
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{
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base.Write(array, offset, BufferSize);
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}
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public override IAsyncResult BeginWrite(byte[] array, int offset, int numBytes, AsyncCallback userCallback,
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object stateObject) =>
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base.BeginWrite(array, offset, BufferSize, userCallback, stateObject);
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protected override void Dispose(bool disposing)
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{
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if (!fileHandle.IsClosed) fileHandle.Close();
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base.Dispose(disposing);
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}
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}
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#endif
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#if !MONO
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private const FileOptions NoBuffering = (FileOptions)0x20000000;
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internal static class UnsafeNativeMethods
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{
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[DllImport("Kernel32", CharSet = CharSet.Unicode, SetLastError = true)]
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internal static extern SafeFileHandle CreateFile(string lpFileName, int dwDesiredAccess, FileShare dwShareMode,
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IntPtr securityAttrs, FileMode dwCreationDisposition, int dwFlagsAndAttributes, IntPtr hTemplateFile);
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}
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#endif
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}
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}
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