public static extern bool BackupRead(IntPtr hFile, ref WIN32_STREAM_ID pBuffer, int lBytes, ref int lRead, bool bAbort, bool bSecurity, ref IntPtr context);
public static extern bool BackupRead(IntPtr hFile, ref WIN32_STREAM_ID pBuffer, uint nNumberOfBytesToRead, out uint lpNumberOfBytesRead, bool bAbort, bool bProcessSecurity, ref IntPtr lpContext);
public StreamInfo?GetNextInfo()
{
uint bytesRead;
if (!BackupRead(
hFile: fileHandle,
lpBuffer: buffer,
nNumberOfBytesToRead: structureSize,
lpNumberOfBytesRead: out bytesRead,
bAbort: false,
bProcessSecurity: true,
context: ref this.context))
{
int error = Marshal.GetLastWin32Error();
throw GetIoExceptionForError(error);
}
// Exit if at the end
if (bytesRead == 0)
{
return(null);
}
WIN32_STREAM_ID streamId = (WIN32_STREAM_ID)Marshal.PtrToStructure(buffer.DangerousGetHandle(), typeof(WIN32_STREAM_ID));
string name = null;
if (streamId.dwStreamNameSize > 0)
{
buffer.EnsureByteCapacity(streamId.dwStreamNameSize);
if (!BackupRead(
hFile: fileHandle,
lpBuffer: buffer,
nNumberOfBytesToRead: streamId.dwStreamNameSize,
lpNumberOfBytesRead: out bytesRead,
bAbort: false,
bProcessSecurity: true,
context: ref this.context))
{
int error = Marshal.GetLastWin32Error();
throw GetIoExceptionForError(error);
}
name = Marshal.PtrToStringUni(buffer.DangerousGetHandle(), (int)bytesRead / 2);
}
if (streamId.Size > 0)
{
// Move to the next header, if any
uint low, high;
if (!BackupSeek(
hFile: fileHandle,
dwLowBytesToSeek: uint.MaxValue,
dwHighBytesToSeek: int.MaxValue,
lpdwLowByteSeeked: out low,
lpdwHighByteSeeked: out high,
context: ref context))
{
int error = Marshal.GetLastWin32Error();
if (error != WinError.ERROR_SEEK)
{
throw GetIoExceptionForError(error);
}
}
}
return(new StreamInfo
{
Name = name,
Type = streamId.dwStreamId,
Size = streamId.Size
});
}
public static extern bool BackupRead(SafeFileHandle hFile, ref WIN32_STREAM_ID pBuffer, uint lBytes, ref uint lRead,
bool bAbort, bool bSecurity, ref IntPtr context);
public static extern bool BackupRead(IntPtr hFile, ref WIN32_STREAM_ID pBuffer, uint nNumberOfBytesToRead, out uint lpNumberOfBytesRead, bool bAbort, bool bProcessSecurity, ref IntPtr lpContext);
[DllImport("kernel32")] public static extern bool BackupRead(IntPtr hFile, ref WIN32_STREAM_ID pBuffer, int lBytes, ref int lRead, bool bAbort, bool bSecurity, ref int Context);
public static extern bool BackupRead(IntPtr hFile, ref WIN32_STREAM_ID pBuffer, int lBytes, ref int lRead, bool bAbort, bool bSecurity, ref IntPtr context);
public BackupStreamInformation?GetNextInfo()
{
uint bytesRead;
if (!BackupDesktopMethods.Direct.BackupRead(
hFile: _fileHandle,
lpBuffer: _buffer,
nNumberOfBytesToRead: WIN32_STREAM_ID_SIZE,
lpNumberOfBytesRead: out bytesRead,
bAbort: false,
bProcessSecurity: true,
context: ref _context))
{
throw ErrorHelper.GetIoExceptionForLastError();
}
// Exit if at the end
if (bytesRead == 0)
{
return(null);
}
WIN32_STREAM_ID streamId = Marshal.PtrToStructure <WIN32_STREAM_ID>(_buffer.DangerousGetHandle());
string name = null;
if (streamId.dwStreamNameSize > 0)
{
_buffer.EnsureByteCapacity(streamId.dwStreamNameSize);
if (!BackupDesktopMethods.Direct.BackupRead(
hFile: _fileHandle,
lpBuffer: _buffer,
nNumberOfBytesToRead: streamId.dwStreamNameSize,
lpNumberOfBytesRead: out bytesRead,
bAbort: false,
bProcessSecurity: true,
context: ref _context))
{
throw ErrorHelper.GetIoExceptionForLastError();
}
name = Marshal.PtrToStringUni(_buffer.DangerousGetHandle(), (int)bytesRead / 2);
}
if (streamId.Size > 0)
{
// Move to the next header, if any
uint low, high;
if (!BackupDesktopMethods.Direct.BackupSeek(
hFile: _fileHandle,
dwLowBytesToSeek: uint.MaxValue,
dwHighBytesToSeek: int.MaxValue,
lpdwLowByteSeeked: out low,
lpdwHighByteSeeked: out high,
context: ref _context))
{
WindowsError error = ErrorHelper.GetLastError();
if (error != WindowsError.ERROR_SEEK)
{
throw ErrorHelper.GetIoExceptionForError(error);
}
}
}
return(new BackupStreamInformation
{
Name = name,
StreamType = streamId.dwStreamId,
Size = streamId.Size
});
}
