Gary Sharp
216 lines
9.4 KiB
C#
216 lines
9.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using Microsoft.Win32.SafeHandles;
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using System.Runtime.InteropServices;
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using System.IO;
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using System.Web.Mvc;
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namespace Disco.Services.Logging
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{
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public static class Utilities
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{
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public static List<SelectListItem> ToSelectListItems(this List<Models.LogEventType> items)
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{
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return items.Select(et => new SelectListItem() { Value = et.Id.ToString(), Text = et.Name }).ToList();
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}
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#region Win32 APIs
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/// <summary>
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/// The CreateFile function creates or opens a file, file stream, directory, physical disk, volume, console buffer, tape drive,
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/// communications resource, mailslot, or named pipe. The function returns a handle that can be used to access an object.
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/// </summary>
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/// <param name="lpFileName"></param>
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/// <param name="dwDesiredAccess"> access to the object, which can be read, write, or both</param>
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/// <param name="dwShareMode">The sharing mode of an object, which can be read, write, both, or none</param>
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/// <param name="SecurityAttributes">A pointer to a SECURITY_ATTRIBUTES structure that determines whether or not the returned handle can
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/// be inherited by child processes. Can be null</param>
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/// <param name="dwCreationDisposition">An action to take on files that exist and do not exist</param>
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/// <param name="dwFlagsAndAttributes">The file attributes and flags. </param>
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/// <param name="hTemplateFile">A handle to a template file with the GENERIC_READ access right. The template file supplies file attributes
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/// and extended attributes for the file that is being created. This parameter can be null</param>
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/// <returns>If the function succeeds, the return value is an open handle to a specified file. If a specified file exists before the function
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/// all and dwCreationDisposition is CREATE_ALWAYS or OPEN_ALWAYS, a call to GetLastError returns ERROR_ALREADY_EXISTS, even when the function
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/// succeeds. If a file does not exist before the call, GetLastError returns 0 (zero).
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/// If the function fails, the return value is INVALID_HANDLE_VALUE. To get extended error information, call GetLastError.
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/// </returns>
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[DllImport("kernel32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
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private static extern SafeFileHandle CreateFile(
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string lpFileName,
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EFileAccess dwDesiredAccess,
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EFileShare dwShareMode,
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IntPtr SecurityAttributes,
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ECreationDisposition dwCreationDisposition,
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EFileAttributes dwFlagsAndAttributes,
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IntPtr hTemplateFile
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);
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[Flags]
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private enum EFileAccess : uint
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{
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Delete = 0x10000,
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ReadControl = 0x20000,
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WriteDAC = 0x40000,
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WriteOwner = 0x80000,
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Synchronize = 0x100000,
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StandardRightsRequired = 0xF0000,
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StandardRightsRead = ReadControl,
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StandardRightsWrite = ReadControl,
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StandardRightsExecute = ReadControl,
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StandardRightsAll = 0x1F0000,
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SpecificRightsAll = 0xFFFF,
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AccessSystemSecurity = 0x1000000, // AccessSystemAcl access type
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MaximumAllowed = 0x2000000, // MaximumAllowed access type
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GenericRead = 0x80000000,
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GenericWrite = 0x40000000,
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GenericExecute = 0x20000000,
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GenericAll = 0x10000000
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}
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[Flags]
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private enum EFileShare : uint
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{
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/// <summary>
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///
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/// </summary>
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None = 0x00000000,
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/// <summary>
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/// Enables subsequent open operations on an object to request read access.
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/// Otherwise, other processes cannot open the object if they request read access.
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/// If this flag is not specified, but the object has been opened for read access, the function fails.
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/// </summary>
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Read = 0x00000001,
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/// <summary>
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/// Enables subsequent open operations on an object to request write access.
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/// Otherwise, other processes cannot open the object if they request write access.
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/// If this flag is not specified, but the object has been opened for write access, the function fails.
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/// </summary>
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Write = 0x00000002,
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/// <summary>
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/// Enables subsequent open operations on an object to request delete access.
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/// Otherwise, other processes cannot open the object if they request delete access.
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/// If this flag is not specified, but the object has been opened for delete access, the function fails.
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/// </summary>
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Delete = 0x00000004
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}
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private enum ECreationDisposition : uint
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{
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/// <summary>
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/// Creates a new file. The function fails if a specified file exists.
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/// </summary>
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New = 1,
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/// <summary>
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/// Creates a new file, always.
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/// If a file exists, the function overwrites the file, clears the existing attributes, combines the specified file attributes,
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/// and flags with FILE_ATTRIBUTE_ARCHIVE, but does not set the security descriptor that the SECURITY_ATTRIBUTES structure specifies.
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/// </summary>
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CreateAlways = 2,
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/// <summary>
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/// Opens a file. The function fails if the file does not exist.
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/// </summary>
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OpenExisting = 3,
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/// <summary>
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/// Opens a file, always.
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/// If a file does not exist, the function creates a file as if dwCreationDisposition is CREATE_NEW.
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/// </summary>
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OpenAlways = 4,
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/// <summary>
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/// Opens a file and truncates it so that its size is 0 (zero) bytes. The function fails if the file does not exist.
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/// The calling process must open the file with the GENERIC_WRITE access right.
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/// </summary>
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TruncateExisting = 5
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}
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[Flags]
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private enum EFileAttributes : uint
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{
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None = 0x0000000,
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Readonly = 0x00000001,
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Hidden = 0x00000002,
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System = 0x00000004,
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Directory = 0x00000010,
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Archive = 0x00000020,
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Device = 0x00000040,
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Normal = 0x00000080,
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Temporary = 0x00000100,
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SparseFile = 0x00000200,
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ReparsePoint = 0x00000400,
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Compressed = 0x00000800,
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Offline = 0x00001000,
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NotContentIndexed = 0x00002000,
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Encrypted = 0x00004000,
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Write_Through = 0x80000000,
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Overlapped = 0x40000000,
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NoBuffering = 0x20000000,
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RandomAccess = 0x10000000,
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SequentialScan = 0x08000000,
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DeleteOnClose = 0x04000000,
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BackupSemantics = 0x02000000,
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PosixSemantics = 0x01000000,
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OpenReparsePoint = 0x00200000,
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OpenNoRecall = 0x00100000,
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FirstPipeInstance = 0x00080000
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}
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private const int FSCTL_SET_COMPRESSION = 0x9C040;
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private const short COMPRESSION_FORMAT_DEFAULT = 1;
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[DllImport("kernel32.dll", SetLastError = true)]
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private static extern int DeviceIoControl(
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SafeFileHandle hDevice,
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int dwIoControlCode,
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ref short lpInBuffer,
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int nInBufferSize,
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IntPtr lpOutBuffer,
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int nOutBufferSize,
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ref int lpBytesReturned,
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IntPtr lpOverlapped);
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#endregion
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public static void CompressDirectory(string DirectoryPath)
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{
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if (DirectoryPath.Length > 250)
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throw new InvalidOperationException(string.Format("Directory Path to Long (>250) to Compress: {0}", DirectoryPath));
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DirectoryInfo dirInfo = new DirectoryInfo(DirectoryPath);
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if (dirInfo.Exists)
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{
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if ((dirInfo.Attributes & FileAttributes.Compressed) != FileAttributes.Compressed)
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{
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var dirHandle = CreateFile(DirectoryPath, EFileAccess.GenericWrite, EFileShare.Read, IntPtr.Zero, ECreationDisposition.OpenExisting, EFileAttributes.None, IntPtr.Zero);
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if (dirHandle.IsInvalid)
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{
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Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
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}
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else
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{
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EnableCompression(dirHandle);
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dirHandle.Close();
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}
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}
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}
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else
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{
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throw new InvalidOperationException(string.Format("Directory doesn't exist: {0}", DirectoryPath));
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}
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}
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private static void EnableCompression(SafeFileHandle handle)
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{
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int lpBytesReturned = 0;
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short lpInBuffer = COMPRESSION_FORMAT_DEFAULT;
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int result = DeviceIoControl(handle, FSCTL_SET_COMPRESSION,
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ref lpInBuffer, sizeof(short), IntPtr.Zero, 0,
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ref lpBytesReturned, IntPtr.Zero);
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if (result != 0)
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{
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Marshal.ThrowExceptionForHR(Marshal.GetLastWin32Error());
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}
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}
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}
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}
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