internal static unsafe TFileStream CreateTFileStream(string filePath, FileMode mode = FileMode.Open, FileAccess access = FileAccess.Read, FileShare share = FileShare.Read)
{
FileStream fs = new FileStream(filePath, mode, access, share);
SafeFileHandle handle = fs.SafeFileHandle;
IntPtr ptr = handle.DangerousGetHandle();
_handlesToStreams.Add(ptr, fs);
TFileStream result = new TFileStream();
result.RawFilePos = 0;
result.hFile = ptr;
result.StreamFlags = StreamFlags.None;
result.StreamGetPos = Marshal.GetFunctionPointerForDelegate((STREAM_GETPOS)GetPos);
result.StreamRead = Marshal.GetFunctionPointerForDelegate((STREAM_READ)Read);
result.StreamWrite = Marshal.GetFunctionPointerForDelegate((STREAM_WRITE)Write);
result.StreamGetSize = Marshal.GetFunctionPointerForDelegate((STREAM_GETSIZE)GetSize);
result.StreamSetSize = Marshal.GetFunctionPointerForDelegate((STREAM_SETSIZE)SetSize);
return(result);
}
private static unsafe bool Write(TFileStream* pStream, ref ulong pByteOffset, void* pvBuffer, uint dwBytesToWrite)
{
// Not supported in v1
return false;
}
private static unsafe bool SetSize(TFileStream* pStream, ulong FileSize)
{
// Not supported in v1
return false;
}
private static unsafe bool Read(TFileStream* pStream, ref ulong byteOffset, void* pwBuffer, uint dwBytesToRead)
{
Debug.Assert(dwBytesToRead < int.MaxValue, "Unsupported case; must read < 2GiB worth of data per chunk.");
if (pStream == null)
return false;
FileStream fs;
if (!_handlesToStreams.TryGetValue(pStream->hFile, out fs))
return false;
byte[] tmpBuf = new byte[dwBytesToRead];
if (byteOffset != 0)
{
long pos = unchecked((long)byteOffset);
fs.Seek(pos, SeekOrigin.Begin);
}
fs.Read(tmpBuf, 0, unchecked((int)dwBytesToRead));
IntPtr dest = new IntPtr(pwBuffer);
Marshal.Copy(tmpBuf, 0, dest, unchecked((int)dwBytesToRead));
byteOffset = (ulong)fs.Position;
return true;
}
private static unsafe bool GetSize(TFileStream* pStream, ref ulong FileSize)
{
if (pStream == null)
return false;
FileStream fs;
if (!_handlesToStreams.TryGetValue(pStream->hFile, out fs))
return false;
FileSize = (ulong)fs.Length;
return true;
}
private static unsafe bool GetPos(TFileStream* pStream, ref ulong byteOffset)
{
if (pStream == null)
return false;
FileStream fs;
if (!_handlesToStreams.TryGetValue(pStream->hFile, out fs))
return false;
long pos = fs.Position;
byteOffset = (ulong)pos;
return true;
}
internal static unsafe TFileStream CreateTFileStream(string filePath, FileMode mode = FileMode.Open, FileAccess access = FileAccess.Read, FileShare share = FileShare.Read)
{
FileStream fs = new FileStream(filePath, mode, access, share);
SafeFileHandle handle = fs.SafeFileHandle;
IntPtr ptr = handle.DangerousGetHandle();
_handlesToStreams.Add(ptr, fs);
TFileStream result = new TFileStream();
result.RawFilePos = 0;
result.hFile = ptr;
result.StreamFlags = StreamFlags.None;
result.StreamGetPos = Marshal.GetFunctionPointerForDelegate((STREAM_GETPOS)GetPos);
result.StreamRead = Marshal.GetFunctionPointerForDelegate((STREAM_READ)Read);
result.StreamWrite = Marshal.GetFunctionPointerForDelegate((STREAM_WRITE)Write);
result.StreamGetSize = Marshal.GetFunctionPointerForDelegate((STREAM_GETSIZE)GetSize);
result.StreamSetSize = Marshal.GetFunctionPointerForDelegate((STREAM_SETSIZE)SetSize);
return result;
}