jellyfin/MediaBrowser.Controller/IO/FileData.cs

171 lines
4.8 KiB
C#
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using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.ConstrainedExecution;
using Microsoft.Win32.SafeHandles;
using System.Collections.Generic;
using System.Linq;
namespace MediaBrowser.Controller.IO
{
public static class FileData
{
public const int MAX_PATH = 260;
public const int MAX_ALTERNATE = 14;
public static WIN32_FIND_DATA GetFileData(string fileName)
{
WIN32_FIND_DATA data;
IntPtr handle = FindFirstFile(fileName, out data);
if (handle == IntPtr.Zero)
throw new IOException("FindFirstFile failed");
FindClose(handle);
data.Path = fileName;
return data;
}
public static IEnumerable<WIN32_FIND_DATA> GetFileSystemEntries(string path, string searchPattern)
{
string lpFileName = Path.Combine(path, searchPattern);
WIN32_FIND_DATA lpFindFileData;
var handle = FindFirstFile(lpFileName, out lpFindFileData);
if (handle == IntPtr.Zero)
{
int hr = Marshal.GetLastWin32Error();
if (hr != 2 && hr != 0x12)
{
throw new IOException("GetFileSystemEntries failed");
}
yield break;
}
if (IsValid(lpFindFileData.cFileName))
{
yield return lpFindFileData;
}
while (FindNextFile(handle, out lpFindFileData) != IntPtr.Zero)
{
if (IsValid(lpFindFileData.cFileName))
{
lpFindFileData.Path = Path.Combine(path, lpFindFileData.cFileName);
yield return lpFindFileData;
}
}
FindClose(handle);
}
private static bool IsValid(string cFileName)
{
if (cFileName.Equals(".", StringComparison.OrdinalIgnoreCase))
{
return false;
}
if (cFileName.Equals("..", StringComparison.OrdinalIgnoreCase))
{
return false;
}
return true;
}
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr FindFirstFile(string fileName, out WIN32_FIND_DATA data);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr FindNextFile(IntPtr hFindFile, out WIN32_FIND_DATA data);
[DllImport("kernel32")]
private static extern bool FindClose(IntPtr hFindFile);
}
[StructLayout(LayoutKind.Sequential)]
public struct FILETIME
{
public uint dwLowDateTime;
public uint dwHighDateTime;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct WIN32_FIND_DATA
{
public FileAttributes dwFileAttributes;
public FILETIME ftCreationTime;
public FILETIME ftLastAccessTime;
public FILETIME ftLastWriteTime;
public int nFileSizeHigh;
public int nFileSizeLow;
public int dwReserved0;
public int dwReserved1;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = FileData.MAX_PATH)]
public string cFileName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = FileData.MAX_ALTERNATE)]
public string cAlternate;
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public bool IsHidden
{
get
{
return dwFileAttributes.HasFlag(FileAttributes.Hidden);
}
}
public bool IsSystemFile
{
get
{
return dwFileAttributes.HasFlag(FileAttributes.System);
}
}
public bool IsDirectory
{
get
{
return dwFileAttributes.HasFlag(FileAttributes.Directory);
}
}
public DateTime CreationTime
{
get
{
return ParseFileTime(ftCreationTime);
}
}
public DateTime LastAccessTime
{
get
{
return ParseFileTime(ftLastAccessTime);
}
}
public DateTime LastWriteTime
{
get
{
return ParseFileTime(ftLastWriteTime);
}
}
private DateTime ParseFileTime(FILETIME filetime)
{
long highBits = filetime.dwHighDateTime;
highBits = highBits << 32;
return DateTime.FromFileTime(highBits + (long)filetime.dwLowDateTime);
}
public string Path { get; set; }
}
}