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Switched to low-level io methods for better performance

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pull/702/head
LukePulverenti Luke Pulverenti luke pulverenti 13 years ago
parent 6fbeee841f
commit 758d18a652
19 changed files with 205 additions and 85 deletions
Show Stats Download Patch File Download Diff File

44
MediaBrowser.Controller/Events/ItemResolveEventArgs.cs
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@ -2,6 +2,7 @@
using System.Collections.Generic;
using System.IO;
using MediaBrowser.Model.Entities;
using MediaBrowser.Controller.IO;
namespace MediaBrowser.Controller.Events
{
@ -10,18 +11,25 @@ namespace MediaBrowser.Controller.Events
/// </summary>
public class ItemResolveEventArgs : PreBeginResolveEventArgs
{
public IEnumerable<KeyValuePair<string, FileAttributes>> FileSystemChildren { get; set; }
public IEnumerable<KeyValuePair<string, WIN32_FIND_DATA>> FileSystemChildren { get; set; }
public KeyValuePair<string, FileAttributes>? GetFolderByName(string name)
public KeyValuePair<string, WIN32_FIND_DATA>? GetFileSystemEntry(string path, bool? isFolder)
{
foreach (KeyValuePair<string, FileAttributes> entry in FileSystemChildren)
foreach (KeyValuePair<string, WIN32_FIND_DATA> entry in FileSystemChildren)
{
if (!entry.Value.HasFlag(FileAttributes.Directory))
if (isFolder.HasValue)
{
continue;
if (isFolder.Value && entry.Value.IsDirectory)
{
continue;
}
else if (!isFolder.Value && !entry.Value.IsDirectory)
{
continue;
}
}
if (System.IO.Path.GetFileName(entry.Key).Equals(name, StringComparison.OrdinalIgnoreCase))
if (entry.Key.Equals(path, StringComparison.OrdinalIgnoreCase))
{
return entry;
}
@ -29,14 +37,21 @@ namespace MediaBrowser.Controller.Events
return null;
}
public KeyValuePair<string, FileAttributes>? GetFileByName(string name)
public KeyValuePair<string, WIN32_FIND_DATA>? GetFileSystemEntryByName(string name, bool? isFolder)
{
foreach (KeyValuePair<string, FileAttributes> entry in FileSystemChildren)
foreach (KeyValuePair<string, WIN32_FIND_DATA> entry in FileSystemChildren)
{
if (entry.Value.HasFlag(FileAttributes.Directory))
if (isFolder.HasValue)
{
continue;
if (isFolder.Value && entry.Value.IsDirectory)
{
continue;
}
else if (!isFolder.Value && !entry.Value.IsDirectory)
{
continue;
}
}
if (System.IO.Path.GetFileName(entry.Key).Equals(name, StringComparison.OrdinalIgnoreCase))
@ -50,12 +65,12 @@ namespace MediaBrowser.Controller.Events
public bool ContainsFile(string name)
{
return GetFileByName(name) != null;
return GetFileSystemEntryByName(name, false) != null;
}
public bool ContainsFolder(string name)
{
return GetFolderByName(name) != null;
return GetFileSystemEntryByName(name, true) != null;
}
}
@ -71,7 +86,8 @@ namespace MediaBrowser.Controller.Events
public bool Cancel { get; set; }
public FileAttributes FileAttributes { get; set; }
public FileAttributes FileAttributes { get { return FileData.dwFileAttributes; } }
public WIN32_FIND_DATA FileData { get; set; }
public bool IsFolder
{

6
MediaBrowser.Controller/IO/DirectoryWatchers.cs
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@ -83,7 +83,7 @@ namespace MediaBrowser.Controller.IO
List<string> paths = affectedPaths;
affectedPaths = new List<string>();
await ProcessPathChanges(paths);
await ProcessPathChanges(paths).ConfigureAwait(false);
}
private async Task ProcessPathChanges(IEnumerable<string> paths)
@ -105,11 +105,11 @@ namespace MediaBrowser.Controller.IO
return folder != null && folder.IsRoot;
}))
{
await Kernel.Instance.ReloadRoot();
await Kernel.Instance.ReloadRoot().ConfigureAwait(false);
}
else
{
await Task.WhenAll(itemsToRefresh.Select(i => Kernel.Instance.ReloadItem(i)));
await Task.WhenAll(itemsToRefresh.Select(i => Kernel.Instance.ReloadItem(i))).ConfigureAwait(false);
}
}

96
MediaBrowser.Controller/IO/FileData.cs
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@ -0,0 +1,96 @@
using System;
using System.IO;
using System.Runtime.InteropServices;
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);
return data;
}
[DllImport("kernel32")]
private static extern IntPtr FindFirstFile(string fileName, 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;
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);
}
}
}

48
MediaBrowser.Controller/Library/ItemController.cs
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@ -20,13 +20,13 @@ namespace MediaBrowser.Controller.Library
/// This gives listeners a chance to cancel the operation and cause the path to be ignored.
/// </summary>
public event EventHandler<PreBeginResolveEventArgs> PreBeginResolvePath;
private bool OnPreBeginResolvePath(Folder parent, string path, FileAttributes attributes)
private bool OnPreBeginResolvePath(Folder parent, string path, WIN32_FIND_DATA fileData)
{
PreBeginResolveEventArgs args = new PreBeginResolveEventArgs()
{
Path = path,
Parent = parent,
FileAttributes = attributes,
FileData = fileData,
Cancel = false
};
@ -111,39 +111,41 @@ namespace MediaBrowser.Controller.Library
/// </summary>
public async Task<BaseItem> GetItem(Folder parent, string path)
{
return await GetItemInternal(parent, path, File.GetAttributes(path)).ConfigureAwait(false);
WIN32_FIND_DATA fileData = FileData.GetFileData(path);
return await GetItemInternal(parent, path, fileData).ConfigureAwait(false);
}
/// <summary>
/// Resolves a path into a BaseItem
/// </summary>
private async Task<BaseItem> GetItemInternal(Folder parent, string path, FileAttributes attributes)
private async Task<BaseItem> GetItemInternal(Folder parent, string path, WIN32_FIND_DATA fileData)
{
if (!OnPreBeginResolvePath(parent, path, attributes))
if (!OnPreBeginResolvePath(parent, path, fileData))
{
return null;
}
IEnumerable<KeyValuePair<string, FileAttributes>> fileSystemChildren;
IEnumerable<KeyValuePair<string, WIN32_FIND_DATA>> fileSystemChildren;
// Gather child folder and files
if (attributes.HasFlag(FileAttributes.Directory))
if (fileData.IsDirectory)
{
fileSystemChildren = Directory.GetFileSystemEntries(path, "*", SearchOption.TopDirectoryOnly).Select(f => new KeyValuePair<string, FileAttributes>(f, File.GetAttributes(f)));
fileSystemChildren = Directory.GetFileSystemEntries(path, "*", SearchOption.TopDirectoryOnly).Select(f => new KeyValuePair<string, WIN32_FIND_DATA>(f, FileData.GetFileData(f)));
bool isVirtualFolder = parent != null && parent.IsRoot;
fileSystemChildren = FilterChildFileSystemEntries(fileSystemChildren, isVirtualFolder);
}
else
{
fileSystemChildren = new KeyValuePair<string, FileAttributes>[] { };
fileSystemChildren = new KeyValuePair<string, WIN32_FIND_DATA>[] { };
}
ItemResolveEventArgs args = new ItemResolveEventArgs()
{
Path = path,
FileAttributes = attributes,
FileSystemChildren = fileSystemChildren,
FileData = fileData,
Parent = parent,
Cancel = false
};
@ -175,9 +177,9 @@ namespace MediaBrowser.Controller.Library
/// <summary>
/// Finds child BaseItems for a given Folder
/// </summary>
private async Task AttachChildren(Folder folder, IEnumerable<KeyValuePair<string, FileAttributes>> fileSystemChildren)
private async Task AttachChildren(Folder folder, IEnumerable<KeyValuePair<string, WIN32_FIND_DATA>> fileSystemChildren)
{
KeyValuePair<string, FileAttributes>[] fileSystemChildrenArray = fileSystemChildren.ToArray();
KeyValuePair<string, WIN32_FIND_DATA>[] fileSystemChildrenArray = fileSystemChildren.ToArray();
int count = fileSystemChildrenArray.Length;
@ -203,15 +205,15 @@ namespace MediaBrowser.Controller.Library
/// <summary>
/// Transforms shortcuts into their actual paths
/// </summary>
private List<KeyValuePair<string, FileAttributes>> FilterChildFileSystemEntries(IEnumerable<KeyValuePair<string, FileAttributes>> fileSystemChildren, bool flattenShortcuts)
private List<KeyValuePair<string, WIN32_FIND_DATA>> FilterChildFileSystemEntries(IEnumerable<KeyValuePair<string, WIN32_FIND_DATA>> fileSystemChildren, bool flattenShortcuts)
{
List<KeyValuePair<string, FileAttributes>> returnFiles = new List<KeyValuePair<string, FileAttributes>>();
List<KeyValuePair<string, WIN32_FIND_DATA>> returnFiles = new List<KeyValuePair<string, WIN32_FIND_DATA>>();
// Loop through each file
foreach (KeyValuePair<string, FileAttributes> file in fileSystemChildren)
foreach (KeyValuePair<string, WIN32_FIND_DATA> file in fileSystemChildren)
{
// Folders
if (file.Value.HasFlag(FileAttributes.Directory))
if (file.Value.IsDirectory)
{
returnFiles.Add(file);
}
@ -220,28 +222,28 @@ namespace MediaBrowser.Controller.Library
else if (Shortcut.IsShortcut(file.Key))
{
string newPath = Shortcut.ResolveShortcut(file.Key);
FileAttributes newPathAttributes = File.GetAttributes(newPath);
WIN32_FIND_DATA newPathData = FileData.GetFileData(newPath);
// Find out if the shortcut is pointing to a directory or file
if (newPathAttributes.HasFlag(FileAttributes.Directory))
if (newPathData.IsDirectory)
{
// If we're flattening then get the shortcut's children
if (flattenShortcuts)
{
IEnumerable<KeyValuePair<string, FileAttributes>> newChildren = Directory.GetFileSystemEntries(newPath, "*", SearchOption.TopDirectoryOnly).Select(f => new KeyValuePair<string, FileAttributes>(f, File.GetAttributes(f)));
IEnumerable<KeyValuePair<string, WIN32_FIND_DATA>> newChildren = Directory.GetFileSystemEntries(newPath, "*", SearchOption.TopDirectoryOnly).Select(f => new KeyValuePair<string, WIN32_FIND_DATA>(f, FileData.GetFileData(f)));
returnFiles.AddRange(FilterChildFileSystemEntries(newChildren, false));
}
else
{
returnFiles.Add(new KeyValuePair<string, FileAttributes>(newPath, newPathAttributes));
returnFiles.Add(new KeyValuePair<string, WIN32_FIND_DATA>(newPath, newPathData));
}
}
else
{
returnFiles.Add(new KeyValuePair<string, FileAttributes>(newPath, newPathAttributes));
returnFiles.Add(new KeyValuePair<string, WIN32_FIND_DATA>(newPath, newPathData));
}
}
else
@ -335,8 +337,8 @@ namespace MediaBrowser.Controller.Library
ItemResolveEventArgs args = new ItemResolveEventArgs();
args.Path = path;
args.FileAttributes = File.GetAttributes(path);
args.FileSystemChildren = Directory.GetFileSystemEntries(path, "*", SearchOption.TopDirectoryOnly).Select(f => new KeyValuePair<string, FileAttributes>(f, File.GetAttributes(f)));
args.FileData = FileData.GetFileData(path);
args.FileSystemChildren = Directory.GetFileSystemEntries(path, "*", SearchOption.TopDirectoryOnly).Select(f => new KeyValuePair<string, WIN32_FIND_DATA>(f, FileData.GetFileData(f)));
await Kernel.Instance.ExecuteMetadataProviders(item, args).ConfigureAwait(false);

1
MediaBrowser.Controller/MediaBrowser.Controller.csproj
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@ -55,6 +55,7 @@
<Compile Include="FFMpeg\FFProbe.cs" />
<Compile Include="FFMpeg\FFProbeResult.cs" />
<Compile Include="IO\DirectoryWatchers.cs" />
<Compile Include="IO\FileData.cs" />
<Compile Include="IO\Shortcut.cs" />
<Compile Include="Library\ItemController.cs" />
<Compile Include="Kernel.cs" />

2
MediaBrowser.Controller/Providers/AudioInfoProvider.cs
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@ -1,4 +1,5 @@
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
@ -6,7 +7,6 @@ using System.Threading.Tasks;
using MediaBrowser.Controller.Events;
using MediaBrowser.Controller.FFMpeg;
using MediaBrowser.Model.Entities;
using System.Collections.Generic;
namespace MediaBrowser.Controller.Providers
{

2
MediaBrowser.Controller/Providers/FolderProviderFromXml.cs
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@ -21,7 +21,7 @@ namespace MediaBrowser.Controller.Providers
public async override Task Fetch(BaseEntity item, ItemResolveEventArgs args)
{
var metadataFile = args.GetFileByName("folder.xml");
var metadataFile = args.GetFileSystemEntryByName("folder.xml", false);
if (metadataFile.HasValue)
{

9
MediaBrowser.Controller/Providers/ImageFromMediaLocationProvider.cs
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@ -6,6 +6,7 @@ using System.Linq;
using System.Threading.Tasks;
using MediaBrowser.Controller.Events;
using MediaBrowser.Model.Entities;
using MediaBrowser.Controller.IO;
namespace MediaBrowser.Controller.Providers
{
@ -47,9 +48,9 @@ namespace MediaBrowser.Controller.Providers
/// </summary>
private void PopulateImages(BaseEntity item, ItemResolveEventArgs args)
{
foreach (KeyValuePair<string, FileAttributes> file in args.FileSystemChildren)
foreach (KeyValuePair<string, WIN32_FIND_DATA> file in args.FileSystemChildren)
{
if (file.Value.HasFlag(FileAttributes.Directory))
if (file.Value.IsDirectory)
{
continue;
}
@ -80,9 +81,9 @@ namespace MediaBrowser.Controller.Providers
{
List<string> backdropFiles = new List<string>();
foreach (KeyValuePair<string, FileAttributes> file in args.FileSystemChildren)
foreach (KeyValuePair<string, WIN32_FIND_DATA> file in args.FileSystemChildren)
{
if (file.Value.HasFlag(FileAttributes.Directory))
if (file.Value.IsDirectory)
{
continue;
}

2
MediaBrowser.Controller/Providers/LocalTrailerProvider.cs
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@ -24,7 +24,7 @@ namespace MediaBrowser.Controller.Providers
{
BaseItem baseItem = item as BaseItem;
var trailerPath = args.GetFolderByName("trailers");
var trailerPath = args.GetFileSystemEntryByName("trailers", true);
if (trailerPath.HasValue)
{

7
MediaBrowser.Controller/Providers/VideoInfoProvider.cs
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@ -66,12 +66,7 @@ namespace MediaBrowser.Controller.Providers
return false;
}
if (string.IsNullOrEmpty(video.FrameRate))
{
return false;
}
if (video.Height == 0 || video.Width == 0 || video.BitRate == 0)
if (video.FrameRate == 0 || video.Height == 0 || video.Width == 0 || video.BitRate == 0)
{
return false;
}

31
MediaBrowser.Controller/Resolvers/BaseItemResolver.cs
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@ -3,6 +3,8 @@ using System.IO;
using System.Threading.Tasks;
using MediaBrowser.Controller.Events;
using MediaBrowser.Model.Entities;
using MediaBrowser.Controller.IO;
using System.Collections.Generic;
namespace MediaBrowser.Controller.Resolvers
{
@ -55,7 +57,7 @@ namespace MediaBrowser.Controller.Resolvers
EnsureName(item);
// Make sure DateCreated and DateModified have values
EnsureDates(item);
EnsureDates(item, args);
}
return item;
@ -74,18 +76,33 @@ namespace MediaBrowser.Controller.Resolvers
/// <summary>
/// Ensures DateCreated and DateModified have values
/// </summary>
private void EnsureDates(T item)
private void EnsureDates(T item, ItemResolveEventArgs args)
{
// If the subclass didn't supply dates, add them here
if (item.DateCreated == DateTime.MinValue)
if (!Path.IsPathRooted(item.Path))
{
item.DateCreated = Path.IsPathRooted(item.Path) ? File.GetCreationTime(item.Path) : DateTime.Now;
return;
}
if (item.DateModified == DateTime.MinValue)
WIN32_FIND_DATA fileData = args.FileData;
// See if a different path came out of the resolver than what went in
if (!args.Path.Equals(item.Path, StringComparison.OrdinalIgnoreCase))
{
item.DateModified = Path.IsPathRooted(item.Path) ? File.GetLastWriteTime(item.Path) : DateTime.Now;
KeyValuePair<string, WIN32_FIND_DATA>? childData = args.GetFileSystemEntry(item.Path, null);
if (childData != null)
{
fileData = childData.Value.Value;
}
else
{
fileData = FileData.GetFileData(item.Path);
}
}
item.DateCreated = fileData.CreationTime;
item.DateModified = fileData.LastWriteTime;
}
}

5
MediaBrowser.Controller/Resolvers/VideoResolver.cs
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@ -2,6 +2,7 @@
using System.ComponentModel.Composition;
using System.IO;
using MediaBrowser.Controller.Events;
using MediaBrowser.Controller.IO;
using MediaBrowser.Model.Entities;
namespace MediaBrowser.Controller.Resolvers
@ -50,9 +51,9 @@ namespace MediaBrowser.Controller.Resolvers
}
// Also check the subfolders for bluray or dvd
foreach (KeyValuePair<string, FileAttributes> folder in args.FileSystemChildren)
foreach (KeyValuePair<string, WIN32_FIND_DATA> folder in args.FileSystemChildren)
{
if (!folder.Value.HasFlag(FileAttributes.Directory))
if (!folder.Value.IsDirectory)
{
continue;
}

13
MediaBrowser.Controller/Xml/BaseItemXmlParser.cs
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@ -33,17 +33,6 @@ namespace MediaBrowser.Controller.Xml
}
}
}
// If dates weren't supplied in metadata, use values from the xml file
if (item.DateCreated == DateTime.MinValue)
{
item.DateCreated = File.GetCreationTime(metadataFile);
}
if (item.DateModified == DateTime.MinValue)
{
item.DateModified = File.GetLastWriteTime(metadataFile);
}
}
/// <summary>
@ -414,7 +403,7 @@ namespace MediaBrowser.Controller.Xml
break;
case "FrameRate":
item.FrameRate = reader.ReadElementContentAsString();
item.FrameRate = reader.ReadFloatSafe();
break;
case "ScanType":

2
MediaBrowser.Model/Entities/Video.cs
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@ -12,7 +12,7 @@ namespace MediaBrowser.Model.Entities
public int Height { get; set; }
public int Width { get; set; }
public string ScanType { get; set; }
public string FrameRate { get; set; }
public float FrameRate { get; set; }
public int BitRate { get; set; }
public string Codec { get; set; }
}

2
MediaBrowser.Movies/Providers/MovieProviderFromXml.cs
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@ -23,7 +23,7 @@ namespace MediaBrowser.Movies.Providers
public async override Task Fetch(BaseEntity item, ItemResolveEventArgs args)
{
var metadataFile = args.GetFileByName("movie.xml");
var metadataFile = args.GetFileSystemEntryByName("movie.xml", false);
if (metadataFile.HasValue)
{

9
MediaBrowser.Movies/Resolvers/MovieResolver.cs
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@ -5,6 +5,7 @@ using System.IO;
using System.Linq;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Events;
using MediaBrowser.Controller.IO;
using MediaBrowser.Controller.Resolvers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Movies.Entities;
@ -24,7 +25,7 @@ namespace MediaBrowser.Movies.Resolvers
return null;
}
var metadataFile = args.GetFileByName("movie.xml");
var metadataFile = args.GetFileSystemEntryByName("movie.xml", false);
if (metadataFile.HasValue || Path.GetFileName(args.Path).IndexOf("[tmdbid=", StringComparison.OrdinalIgnoreCase) != -1)
{
@ -57,8 +58,8 @@ namespace MediaBrowser.Movies.Resolvers
ItemResolveEventArgs childArgs = new ItemResolveEventArgs()
{
Path = child.Key,
FileAttributes = child.Value,
FileSystemChildren = new KeyValuePair<string, FileAttributes>[] { }
FileData = child.Value,
FileSystemChildren = new KeyValuePair<string, WIN32_FIND_DATA>[] { }
};
var item = base.Resolve(childArgs);
@ -78,7 +79,7 @@ namespace MediaBrowser.Movies.Resolvers
private void PopulateBonusFeatures(Movie item, ItemResolveEventArgs args)
{
var trailerPath = args.GetFolderByName("specials");
var trailerPath = args.GetFileSystemEntryByName("specials", true);
if (trailerPath.HasValue)
{

2
MediaBrowser.TV/Providers/SeriesProviderFromXml.cs
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@ -23,7 +23,7 @@ namespace MediaBrowser.TV.Providers
public async override Task Fetch(BaseEntity item, ItemResolveEventArgs args)
{
var metadataFile = args.GetFileByName("series.xml");
var metadataFile = args.GetFileSystemEntryByName("series.xml", false);
if (metadataFile.HasValue)
{

2
MediaBrowser.TV/Resolvers/SeriesResolver.cs
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@ -26,7 +26,7 @@ namespace MediaBrowser.TV.Resolvers
return null;
}
var metadataFile = args.GetFileByName("series.xml");
var metadataFile = args.GetFileSystemEntryByName("series.xml", false);
if (metadataFile.HasValue || Path.GetFileName(args.Path).IndexOf("[tvdbid=", StringComparison.OrdinalIgnoreCase) != -1 || TVUtils.IsSeriesFolder(args.Path, args.FileSystemChildren))
{

7
MediaBrowser.TV/TVUtils.cs
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@ -1,7 +1,8 @@
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using MediaBrowser.Controller.IO;
namespace MediaBrowser.TV
{
@ -52,11 +53,11 @@ namespace MediaBrowser.TV
return seasonPathExpressions.Any(r => r.IsMatch(path));
}
public static bool IsSeriesFolder(string path, IEnumerable<KeyValuePair<string, FileAttributes>> fileSystemChildren)
public static bool IsSeriesFolder(string path, IEnumerable<KeyValuePair<string, WIN32_FIND_DATA>> fileSystemChildren)
{
foreach (var child in fileSystemChildren)
{
if (child.Value.HasFlag(FileAttributes.Directory))
if (child.Value.IsDirectory)
{
if (IsSeasonFolder(child.Key))
{

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