/// <summary>
/// Creates the file information on the basis of the path and <see cref="Win32FindData"/>
/// </summary>
/// <param name="pathInfo">Full path to the file</param>
/// <param name="win32FindData"><see cref="Win32FindData"/></param>
internal FileDetail(PathInfo pathInfo, Win32FindData win32FindData)
{
PathInfo = pathInfo;
CalculateSize(win32FindData);
}
/// <summary>
/// Calculates the size of the file from the handle
/// </summary>
/// <param name="win32FindData"></param>
private void CalculateSize(Win32FindData win32FindData)
{
Bytes = win32FindData.CalculateBytes();
}
internal static FileOrDirectory DetermineFileSystemEntry(Win32FindData findData)
{
return !ContainsFileAttribute(findData.dwFileAttributes, FileAttributes.Directory) ? FileOrDirectory.File : FileOrDirectory.Directory;
}
/// <summary>
/// Creates the file information on the basis of the path and <see cref="Win32FindData"/>
/// </summary>
/// <param name="fullName">Full path to the file</param>
/// <param name="win32FindData"><see cref="Win32FindData"/></param>
internal FileDetail(String fullName, Win32FindData win32FindData)
: this(new PathInfo(fullName), win32FindData)
{
}
/// <summary>
/// Returns the handle by given path and finddata
/// </summary>
/// <param name="uncPath">Specified path</param>
/// <param name="win32FindData">FindData to fill</param>
/// <param name="win32Error">Win32Error Code. 0 on success</param>
/// <returns><see cref="Win32FileHandle" /> of specified path</returns>
static Win32FileHandle FindFirstFileManaged(String uncPath, Win32FindData win32FindData, out Int32 win32Error)
{
var handle = Win32SafeNativeMethods.FindFirstFile(uncPath, win32FindData);
win32Error = Marshal.GetLastWin32Error();
return handle;
}
/// <summary>
/// Determined all files of a directory
/// </summary>
/// <param name="uncDirectoryPath">Path of the directory</param>
/// <param name="pattern">Search pattern. Uses Win32 native filtering.</param>
/// <param name="searchOption">
/// <see cref="SearchOption" />
/// </param>
/// <param name="enumerateOptions">The enumeration options for exception handling</param>
/// <returns>Collection of files</returns>
internal static IEnumerable<FileDetail> EnumerateFiles(String uncDirectoryPath, String pattern = "*", SearchOption searchOption = SearchOption.TopDirectoryOnly, SuppressExceptions enumerateOptions = SuppressExceptions.None)
{
// Match for start of search
string currentPath = PathTools.Combine(uncDirectoryPath, pattern);
// Find First file
var win32FindData = new Win32FindData();
int win32Error;
using (var fileHandle = FindFirstFileManaged(currentPath, win32FindData, out win32Error))
{
// Take care of invalid handles
if (fileHandle.IsInvalid && EnumerationHandleInvalidFileHandle(uncDirectoryPath, enumerateOptions, win32Error))
{
yield return null;
}
// Treffer auswerten
do
{
// Ignore . and .. directories
if (IsSystemDirectoryEntry(win32FindData))
{
continue;
}
// Create hit for current search result
string resultPath = PathTools.Combine(uncDirectoryPath, win32FindData.cFileName);
// Check for Directory
if (!ContainsFileAttribute(win32FindData.dwFileAttributes, FileAttributes.Directory))
{
yield return new FileDetail(resultPath, win32FindData);
}
else
{
// SubFolders?!
if (searchOption == SearchOption.AllDirectories)
{
foreach (var match in EnumerateFiles(resultPath, pattern, searchOption, enumerateOptions))
{
yield return match;
}
}
}
// Create new FindData object for next result
win32FindData = new Win32FindData();
} // Search for next entry
while (Win32SafeNativeMethods.FindNextFile(fileHandle, win32FindData));
}
}
/// <summary>
/// Returns the <see cref="Win32FindData" /> from specified <paramref name="pathInfo" />
/// </summary>
/// <param name="pathInfo">Path to the file system entry</param>
/// <returns>
/// <see cref="Win32FindData" />
/// </returns>
public static Win32FindData GetFindDataFromPath(PathInfo pathInfo)
{
var win32FindData = new Win32FindData();
int win32Error;
using (var fileHandle = FindFirstSafeFileHandle(pathInfo.FullNameUnc, win32FindData, out win32Error))
{
// Take care of invalid handles
if (fileHandle.IsInvalid)
{
NativeExceptionMapping(pathInfo.FullName, win32Error);
}
// Ignore . and .. directories
if (!IsSystemDirectoryEntry(win32FindData))
{
return win32FindData;
}
}
throw new Exception("PathNotFound " + pathInfo.FullName);
}
/// <summary>
/// Returns the <see cref="SafeFileHandle" /> and fills <see cref="Win32FindData" /> from the passes path.
/// </summary>
/// <param name="path">Path to the file system entry</param>
/// <param name="win32FindData"></param>
/// <param name="win32Error">Last error code. 0 if no error occurs</param>
/// <returns>
/// <see cref="SafeFileHandle" />
/// </returns>
static Win32FileHandle FindFirstSafeFileHandle(string path, Win32FindData win32FindData, out Int32 win32Error)
{
var result = Win32SafeNativeMethods.FindFirstFile(path, win32FindData);
win32Error = Marshal.GetLastWin32Error();
return result;
}
static Boolean IsSystemDirectoryEntry(Win32FindData win32FindData)
{
if (win32FindData.cFileName.Length >= 3)
{
return false;
}
return (win32FindData.cFileName == "." || win32FindData.cFileName == "..");
}
/// <summary>
/// Gets the <see cref="Win32FindData" /> from the passed path.
/// </summary>
/// <param name="pathInfo">Path</param>
/// <param name="pathFindData"><seealso cref="Win32FindData" />. Will be null if path does not exist.</param>
/// <returns>true if path is valid and <see cref="Win32FindData" /> is set</returns>
/// <remarks>
/// <see>
/// <cref>QuickIOCommon.NativeExceptionMapping</cref>
/// </see>
/// if invalid handle found.
/// </remarks>
public static bool TryGetFindDataFromPath(PathInfo pathInfo, out Win32FindData pathFindData)
{
var win32FindData = new Win32FindData();
int win32Error;
using (var fileHandle = FindFirstSafeFileHandle(pathInfo.FullNameUnc, win32FindData, out win32Error))
{
// Take care of invalid handles
if (fileHandle.IsInvalid)
{
NativeExceptionMapping(pathInfo.FullName, win32Error);
}
// Ignore . and .. directories
if (!IsSystemDirectoryEntry(win32FindData))
{
pathFindData = win32FindData;
return true;
}
}
pathFindData = null;
return false;
}
public static bool IsSymLink(Win32FindData win32FindData)
{
return
((uint)win32FindData.dwFileAttributes & (uint)FileAttrFlags.FILE_ATTRIBUTE_REPARSE_POINT) == (uint)FileAttrFlags.FILE_ATTRIBUTE_REPARSE_POINT
&&
((uint)win32FindData.dwReserved0 & SymLinkTag) == SymLinkTag;
}
