// see if http://www.declaresub.com/wiki/index.php/Alternate_Data_Streams (QueryInformationFile) performs better and is more accurate
internal long GetSize()
{
long size = 0;
const int bufferSize = 4096;
using (System.IO.FileStream fs = Alphaleonis.Win32.Filesystem.File.OpenBackupRead(fileName)){
/*using (System.IO.FileStream fs = Alphaleonis.Win32.Filesystem.File.Open(fileName,
* Alphaleonis.Win32.Filesystem.FileMode.Open, Alphaleonis.Win32.Filesystem.FileAccess.Read,
* Alphaleonis.Win32.Filesystem.FileShare.ReadWrite)){*/
IntPtr context = IntPtr.Zero;
IntPtr buffer = Marshal.AllocHGlobal(bufferSize);
try{
while (true)
{
uint numRead;
if (!BackupRead(fs.SafeFileHandle, buffer, (uint)Marshal.SizeOf(typeof(Win32StreamID)), out numRead, false, true, ref context))
{
Logger.Append(Severity.WARNING, "Error getting size information for item " + fileName);
}
if (numRead > 0)
{
Win32StreamID streamID = (Win32StreamID)Marshal.PtrToStructure(buffer, typeof(Win32StreamID));
// string name = null;
if (streamID.dwStreamNameSize > 0)
{
if (!BackupRead(fs.SafeFileHandle, buffer, (uint)Math.Min(bufferSize, streamID.dwStreamNameSize), out numRead, false, true, ref context))
{
Logger.Append(Severity.WARNING, "Error getting size information for item " + fileName);
}
// name = Marshal.PtrToStringUni(buffer, (int)numRead / 2);
}
size += streamID.Size;
if (streamID.Size > 0)
{
uint lo, hi;
BackupSeek(fs.SafeFileHandle, uint.MaxValue, int.MaxValue, out lo, out hi, ref context);
size += lo + hi;
}
}
else
{
break;
}
}
}
finally{
Marshal.FreeHGlobal(buffer);
uint numRead;
if (!BackupRead(fs.SafeFileHandle, IntPtr.Zero, 0, out numRead, true, false, ref context))
{
Logger.Append(Severity.ERROR, "Error closing handle after getting size information for item " + fileName);
}
}
} // end using
return(size);
}
private static IEnumerable <StreamInfo> GetStreams(SafeFileHandle fh)
{
const int bufferSize = 4096;
IntPtr context = IntPtr.Zero;
IntPtr buffer = Marshal.AllocHGlobal(bufferSize);
try
{
while (true)
{
uint numRead;
if (!BackupRead(fh, buffer, (uint)Marshal.SizeOf(typeof(Win32StreamID)),
out numRead, false, true, ref context))
{
throw new IOException("Cannot read stream info");
}
if (numRead > 0)
{
Win32StreamID streamID = (Win32StreamID)Marshal.PtrToStructure(buffer, typeof(Win32StreamID));
string name = null;
if (streamID.dwStreamNameSize > 0)
{
if (!BackupRead(fh, buffer, (uint)Math.Min(bufferSize, streamID.dwStreamNameSize),
out numRead, false, true, ref context))
{
throw new IOException("Cannot read stream info");
}
name = Marshal.PtrToStringUni(buffer, (int)numRead / 2);
}
if (!string.IsNullOrEmpty(name))
{
yield return(new StreamInfo(name, streamID.dwStreamId, streamID.Size));
}
if (streamID.Size > 0)
{
uint lo, hi;
BackupSeek(fh, uint.MaxValue, int.MaxValue, out lo, out hi, ref context);
}
}
else
{
break;
}
}
}
finally
{
Marshal.FreeHGlobal(buffer);
uint numRead;
if (!BackupRead(fh, IntPtr.Zero, 0, out numRead, true, false, ref context))
{
throw new IOException("Cannot read stream info");
}
}
}
