private static extern bool BackupRead(
SafeFileHandle hFile,
ref Win32StreamId pBuffer,
int numberOfBytesToRead,
out int numberOfBytesRead,
[MarshalAs(UnmanagedType.Bool)] bool abort,
[MarshalAs(UnmanagedType.Bool)] bool processSecurity,
ref IntPtr context);
public static IList <Win32StreamInfo> ListStreams(string filePath)
{
if (string.IsNullOrEmpty(filePath))
{
throw new ArgumentNullException("filePath");
}
if (-1 != filePath.IndexOfAny(Path.GetInvalidPathChars()))
{
throw new ArgumentException(Resources.Error_InvalidFileChars, "filePath");
}
var result = new List <Win32StreamInfo>();
using (SafeFileHandle hFile = SafeCreateFile(filePath, NativeFileAccess.GenericRead, FileShare.Read, IntPtr.Zero, FileMode.Open, NativeFileFlags.BackupSemantics, IntPtr.Zero))
using (var hName = new StreamName())
{
if (!hFile.IsInvalid)
{
var streamId = new Win32StreamId();
int dwStreamHeaderSize = Marshal.SizeOf(streamId);
bool finished = false;
IntPtr context = IntPtr.Zero;
int bytesRead;
string name;
try
{
while (!finished)
{
// Read the next stream header:
if (!BackupRead(hFile, ref streamId, dwStreamHeaderSize, out bytesRead, false, false, ref context))
{
finished = true;
}
else if (dwStreamHeaderSize != bytesRead)
{
finished = true;
}
else
{
// Read the stream name:
if (0 >= streamId.StreamNameSize)
{
name = null;
}
else
{
hName.EnsureCapacity(streamId.StreamNameSize);
if (!BackupRead(hFile, hName.MemoryBlock, streamId.StreamNameSize, out bytesRead, false, false, ref context))
{
name = null;
finished = true;
}
else
{
// Unicode chars are 2 bytes:
name = hName.ReadStreamName(bytesRead >> 1);
}
}
// Add the stream info to the result:
if (!string.IsNullOrEmpty(name))
{
result.Add(new Win32StreamInfo
{
StreamType = (FileStreamType)streamId.StreamId,
StreamAttributes = (FileStreamAttributes)streamId.StreamAttributes,
StreamSize = streamId.Size.ToInt64(),
StreamName = name
});
}
// Skip the contents of the stream:
int bytesSeekedLow, bytesSeekedHigh;
if (!finished && !BackupSeek(hFile, streamId.Size.Low, streamId.Size.High, out bytesSeekedLow, out bytesSeekedHigh, ref context))
{
finished = true;
}
}
}
}
finally
{
// Abort the backup:
BackupRead(hFile, hName.MemoryBlock, 0, out bytesRead, true, false, ref context);
}
}
}
return(result);
}
private static extern bool BackupRead(
SafeFileHandle hFile,
ref Win32StreamId pBuffer,
int numberOfBytesToRead,
out int numberOfBytesRead,
[MarshalAs(UnmanagedType.Bool)] bool abort,
[MarshalAs(UnmanagedType.Bool)] bool processSecurity,
ref IntPtr context);
public static IList<Win32StreamInfo> ListStreams(string filePath)
{
if (string.IsNullOrEmpty(filePath)) throw new ArgumentNullException("filePath");
if (-1 != filePath.IndexOfAny(Path.GetInvalidPathChars())) throw new ArgumentException(Resources.Error_InvalidFileChars, "filePath");
var result = new List<Win32StreamInfo>();
using (SafeFileHandle hFile = SafeCreateFile(filePath, NativeFileAccess.GenericRead, FileShare.Read, IntPtr.Zero, FileMode.Open, NativeFileFlags.BackupSemantics, IntPtr.Zero))
using (var hName = new StreamName())
{
if (!hFile.IsInvalid)
{
var streamId = new Win32StreamId();
int dwStreamHeaderSize = Marshal.SizeOf(streamId);
bool finished = false;
IntPtr context = IntPtr.Zero;
int bytesRead;
string name;
try
{
while (!finished)
{
// Read the next stream header:
if (!BackupRead(hFile, ref streamId, dwStreamHeaderSize, out bytesRead, false, false, ref context))
{
finished = true;
}
else if (dwStreamHeaderSize != bytesRead)
{
finished = true;
}
else
{
// Read the stream name:
if (0 >= streamId.StreamNameSize)
{
name = null;
}
else
{
hName.EnsureCapacity(streamId.StreamNameSize);
if (!BackupRead(hFile, hName.MemoryBlock, streamId.StreamNameSize, out bytesRead, false, false, ref context))
{
name = null;
finished = true;
}
else
{
// Unicode chars are 2 bytes:
name = hName.ReadStreamName(bytesRead >> 1);
}
}
// Add the stream info to the result:
if (!string.IsNullOrEmpty(name))
{
result.Add(new Win32StreamInfo
{
StreamType = (FileStreamType)streamId.StreamId,
StreamAttributes = (FileStreamAttributes)streamId.StreamAttributes,
StreamSize = streamId.Size.ToInt64(),
StreamName = name
});
}
// Skip the contents of the stream:
int bytesSeekedLow, bytesSeekedHigh;
if (!finished && !BackupSeek(hFile, streamId.Size.Low, streamId.Size.High, out bytesSeekedLow, out bytesSeekedHigh, ref context))
{
finished = true;
}
}
}
}
finally
{
// Abort the backup:
BackupRead(hFile, hName.MemoryBlock, 0, out bytesRead, true, false, ref context);
}
}
}
return result;
}
public static extern bool BackupRead(SafeFileHandle file, ref Win32StreamId buffer, int bytesToRead, out int bytesRead, [MarshalAs(UnmanagedType.Bool)] bool abort, [MarshalAs(UnmanagedType.Bool)] bool processSecurity, ref IntPtr context);
