public unsafe void PointerOffset_Negative()
{
void *v = (void *)1000;
v = Pointers.Offset(v, -42);
((int)v).Should().Be(958);
}
public unsafe void PointerOffset()
{
void *v = (void *)1000;
v = Pointers.Offset(v, 42);
((int)v).Should().Be(1042);
}
public unsafe BackupStreamInformation?GetNextInfo()
{
void *buffer = _buffer.VoidPointer;
Error.ThrowLastErrorIfFalse(
Imports.BackupRead(
hFile: _fileHandle,
lpBuffer: buffer,
nNumberOfBytesToRead: s_headerSize,
lpNumberOfBytesRead: out uint bytesRead,
bAbort: false,
bProcessSecurity: true,
context: ref _context));
// Exit if at the end
if (bytesRead == 0)
{
return(null);
}
WIN32_STREAM_ID *streamId = (WIN32_STREAM_ID *)buffer;
if (streamId->dwStreamNameSize > 0)
{
_buffer.EnsureByteCapacity(s_headerSize + streamId->dwStreamNameSize);
Error.ThrowLastErrorIfFalse(
Imports.BackupRead(
hFile: _fileHandle,
lpBuffer: Pointers.Offset(buffer, s_headerSize),
nNumberOfBytesToRead: streamId->dwStreamNameSize,
lpNumberOfBytesRead: out bytesRead,
bAbort: false,
bProcessSecurity: true,
context: ref _context));
}
if (streamId->Size > 0)
{
// Move to the next header, if any
if (!Imports.BackupSeek(
hFile: _fileHandle,
dwLowBytesToSeek: uint.MaxValue,
dwHighBytesToSeek: int.MaxValue,
lpdwLowByteSeeked: out _,
lpdwHighByteSeeked: out _,
context: ref _context))
{
Error.ThrowIfLastErrorNot(WindowsError.ERROR_SEEK);
}
}
return(new BackupStreamInformation
{
Name = streamId->cStreamName.CreateString(),
StreamType = streamId->dwStreamId,
Size = streamId->Size
});
}