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using MediaBrowser.Common.Logging;
using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
namespace MediaBrowser.Controller.IO
{
/// <summary>
/// Provides low level File access that is much faster than the File/Directory api's
/// </summary>
public static class FileData
{
public const int MAX_PATH = 260;
public const int MAX_ALTERNATE = 14;
public static IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);
/// <summary>
/// Gets information about a path
/// </summary>
public static WIN32_FIND_DATA GetFileData(string path)
{
WIN32_FIND_DATA data;
IntPtr handle = FindFirstFile(path, out data);
bool getFilename = false;
if (handle == INVALID_HANDLE_VALUE && !Path.HasExtension(path))
{
if (!path.EndsWith("*"))
{
Logger.LogInfo("Handle came back invalid for {0}. Since this is a directory we'll try appending \\*.", path);
FindClose(handle);
handle = FindFirstFile(Path.Combine(path, "*"), out data);
getFilename = true;
}
}
if (handle == IntPtr.Zero)
{
throw new IOException("FindFirstFile failed");
}
if (getFilename)
{
data.cFileName = Path.GetFileName(path);
}
FindClose(handle);
data.Path = path;
return data;
}
/// <summary>
/// Gets all file system entries within a foler
/// </summary>
public static IEnumerable<WIN32_FIND_DATA> GetFileSystemEntries(string path, string searchPattern)
{
return GetFileSystemEntries(path, searchPattern, true, true);
}
/// <summary>
/// Gets all files within a folder
/// </summary>
public static IEnumerable<WIN32_FIND_DATA> GetFiles(string path, string searchPattern)
{
return GetFileSystemEntries(path, searchPattern, true, false);
}
/// <summary>
/// Gets all sub-directories within a folder
/// </summary>
public static IEnumerable<WIN32_FIND_DATA> GetDirectories(string path, string searchPattern)
{
return GetFileSystemEntries(path, searchPattern, false, true);
}
/// <summary>
/// Gets all file system entries within a foler
/// </summary>
public static IEnumerable<WIN32_FIND_DATA> GetFileSystemEntries(string path, string searchPattern, bool includeFiles, bool includeDirectories)
{
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 (IncludeInOutput(lpFindFileData.cFileName, lpFindFileData.dwFileAttributes, includeFiles, includeDirectories))
{
yield return lpFindFileData;
}
while (FindNextFile(handle, out lpFindFileData) != IntPtr.Zero)
{
if (IncludeInOutput(lpFindFileData.cFileName, lpFindFileData.dwFileAttributes, includeFiles, includeDirectories))
{
lpFindFileData.Path = Path.Combine(path, lpFindFileData.cFileName);
yield return lpFindFileData;
}
}
FindClose(handle);
}
private static bool IncludeInOutput(string cFileName, FileAttributes attributes, bool includeFiles, bool includeDirectories)
{
if (cFileName.Equals(".", StringComparison.OrdinalIgnoreCase))
{
return false;
}
if (cFileName.Equals("..", StringComparison.OrdinalIgnoreCase))
{
return false;
}
if (!includeFiles && !attributes.HasFlag(FileAttributes.Directory))
{
return false;
}
if (!includeDirectories && attributes.HasFlag(FileAttributes.Directory))
{
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);
private const char SpaceChar = ' ';
private static readonly char[] InvalidFileNameChars = Path.GetInvalidFileNameChars();
/// <summary>
/// Takes a filename and removes invalid characters
/// </summary>
public static string GetValidFilename(string filename)
{
foreach (char c in InvalidFileNameChars)
{
filename = filename.Replace(c, SpaceChar);
}
return filename;
}
}
[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;
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 CreationTimeUtc
{
get
{
return ParseFileTime(ftCreationTime);
}
}
public DateTime LastAccessTimeUtc
{
get
{
return ParseFileTime(ftLastAccessTime);
}
}
public DateTime LastWriteTimeUtc
{
get
{
return ParseFileTime(ftLastWriteTime);
}
}
private DateTime ParseFileTime(FILETIME filetime)
{
long highBits = filetime.dwHighDateTime;
highBits = highBits << 32;
return DateTime.FromFileTimeUtc(highBits + (long)filetime.dwLowDateTime);
}
public string Path { get; set; }
}
}
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