/// <summary>
/// Opens the specified file.
/// </summary>
/// <param name="path">The full path of the file to open.</param>
/// <param name="mode">The file mode for the created stream.</param>
/// <param name="access">The access permissions for the returned stream.</param>
/// <param name="options">Options controlling attributes of a new file, or <c>null</c> for defaults (ignored if file exists).</param>
/// <returns>The new stream.</returns>
public SparseStream OpenFile(string path, FileMode mode, FileAccess access, NewFileOptions options)
{
using (new NtfsTransaction())
{
string attributeName;
AttributeType attributeType;
string dirEntryPath = ParsePath(path, out attributeName, out attributeType);
DirectoryEntry entry = GetDirectoryEntry(dirEntryPath);
if (entry == null)
{
if (mode == FileMode.Open)
{
throw new FileNotFoundException("No such file", path);
}
else
{
entry = CreateNewFile(dirEntryPath, options);
}
}
else if (mode == FileMode.CreateNew)
{
throw new IOException("File already exists");
}
if ((entry.Details.FileAttributes & FileAttributes.Directory) != 0 && attributeType == AttributeType.Data)
{
throw new IOException("Attempt to open directory as a file");
}
else
{
File file = GetFile(entry.Reference);
NtfsStream ntfsStream = file.GetStream(attributeType, attributeName);
if (ntfsStream == null)
{
if (mode == FileMode.Create || mode == FileMode.OpenOrCreate)
{
ntfsStream = file.CreateStream(attributeType, attributeName);
}
else
{
throw new FileNotFoundException("No such attribute on file", path);
}
}
SparseStream stream = new NtfsFileStream(this, entry, attributeType, attributeName, access);
if (mode == FileMode.Create || mode == FileMode.Truncate)
{
stream.SetLength(0);
}
return stream;
}
}
}
/// <summary>
/// Opens the specified file.
/// </summary>
/// <param name="path">The full path of the file to open.</param>
/// <param name="mode">The file mode for the created stream.</param>
/// <param name="access">The access permissions for the returned stream.</param>
/// <returns>The new stream.</returns>
public override Stream OpenFile(string path, FileMode mode, FileAccess access)
{
using (new NtfsTransaction())
{
string fileName = Utilities.GetFileFromPath(path);
string attributeName = null;
AttributeType attributeType = AttributeType.Data;
string[] fileNameElements = fileName.Split(new char[]{':'}, 3);
fileName = fileNameElements[0];
if(fileNameElements.Length > 1)
{
attributeName = fileNameElements[1];
if(string.IsNullOrEmpty(attributeName))
{
attributeName = null;
}
}
if(fileNameElements.Length > 2)
{
string typeName = fileNameElements[2];
AttributeDefinitionRecord typeDefn = _context.AttributeDefinitions.Lookup(typeName);
if(typeDefn == null)
{
throw new FileNotFoundException(string.Format(CultureInfo.InvariantCulture, "No such attribute type '{0}'", typeName), path);
}
attributeType = typeDefn.Type;
}
string dirName;
try
{
dirName = Utilities.GetDirectoryFromPath(path);
}
catch (ArgumentException)
{
throw new IOException("Invalid path: " + path);
}
string dirEntryPath;
try
{
dirEntryPath = Path.Combine(dirName, fileName);
}
catch (ArgumentException)
{
throw new IOException("Invalid path: " + path);
}
DirectoryEntry entry = GetDirectoryEntry(dirEntryPath);
if (entry == null)
{
if (mode == FileMode.Open)
{
throw new FileNotFoundException("No such file", path);
}
else
{
File file = File.CreateNew(_context);
try
{
DirectoryEntry parentDirEntry = GetDirectoryEntry(Path.GetDirectoryName(path));
Directory parentDir = GetDirectory(parentDirEntry.Reference);
entry = AddFileToDirectory(file, parentDir, Path.GetFileName(path));
RawSecurityDescriptor sd = DoGetSecurity(parentDir);
DoSetSecurity(file, SecurityDescriptor.CalcNewObjectDescriptor(sd, false));
entry.UpdateFrom(file);
parentDirEntry.UpdateFrom(parentDir);
}
finally
{
if (file.HardLinkCount == 0)
{
file.Delete();
}
}
}
}
else if (mode == FileMode.CreateNew)
{
throw new IOException("File already exists");
}
if ((entry.Details.FileAttributes & FileAttributes.Directory) != 0 && attributeType == AttributeType.Data)
{
throw new IOException("Attempt to open directory as a file");
}
else
{
File file = GetFile(entry.Reference);
NtfsStream ntfsStream = file.GetStream(attributeType, attributeName);
if (ntfsStream == null)
{
if (mode == FileMode.Create || mode == FileMode.OpenOrCreate)
{
ntfsStream = file.CreateStream(attributeType, attributeName);
}
else
{
throw new FileNotFoundException("No such attribute on file", path);
}
}
SparseStream stream = new NtfsFileStream(this, entry, attributeType, attributeName, access);
if (mode == FileMode.Create || mode == FileMode.Truncate)
{
stream.SetLength(0);
}
return stream;
}
}
}
