public 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 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 (
var hFile = SafeCreateFile(filePath, NativeFileAccess.GenericRead, FileShare.Read, IntPtr.Zero, FileMode.Open,
NativeFileAttributesAndFlags.BackupSemantics, IntPtr.Zero)) {
using (var hName = new StreamName()) {
if (!hFile.IsInvalid) {
var streamId = new Win32StreamId();
var dwStreamHeaderSize = Marshal.SizeOf(streamId);
var finished = false;
var context = IntPtr.Zero;
int bytesRead;
string name;
try {
while (!finished) {
// Read the next stream header:
if (!Kernel32.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 (!Kernel32.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,
StreamName = name
});
}
// Skip the contents of the stream:
int bytesSeekedLow,
bytesSeekedHigh;
if (!finished &&
!Kernel32.BackupSeek(hFile, (int)(streamId.Size & 0xffffffff), (int)(streamId.Size >> 32), out bytesSeekedLow,
out bytesSeekedHigh, ref context)) {
finished = true;
}
}
}
} finally {
// Abort the backup:
Kernel32.BackupRead(hFile, hName.MemoryBlock, 0, out bytesRead, true, false, ref context);
}
}
}
}
return result;
}
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 (
var hFile = SafeCreateFile(filePath, NativeFileAccess.GenericRead, FileShare.Read, IntPtr.Zero, FileMode.Open,
NativeFileAttributesAndFlags.BackupSemantics, IntPtr.Zero)) {
using (var hName = new StreamName()) {
if (!hFile.IsInvalid)
{
var streamId = new Win32StreamId();
var dwStreamHeaderSize = Marshal.SizeOf(streamId);
var finished = false;
var context = IntPtr.Zero;
int bytesRead;
string name;
try {
while (!finished)
{
// Read the next stream header:
if (!Kernel32.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 (!Kernel32.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,
StreamName = name
});
}
// Skip the contents of the stream:
int bytesSeekedLow,
bytesSeekedHigh;
if (!finished &&
!Kernel32.BackupSeek(hFile, (int)(streamId.Size & 0xffffffff), (int)(streamId.Size >> 32), out bytesSeekedLow,
out bytesSeekedHigh, ref context))
{
finished = true;
}
}
}
} finally {
// Abort the backup:
Kernel32.BackupRead(hFile, hName.MemoryBlock, 0, out bytesRead, true, false, ref context);
}
}
}
}
return(result);
}