public static unsafe int ReadFile(FileHandle fileHandle, byte[] bufferToReceiveData)
{
int bytesRead;
bool readSuccess;
fixed(byte *pointerToBufferForReading = bufferToReceiveData)
readSuccess = Win32.ReadFile(fileHandle, pointerToBufferForReading, bufferToReceiveData.Length, out bytesRead, IntPtr.Zero) != 0;
if (!readSuccess)
{
throw new FileSystemException(fileHandle.FileFullName, new Win32Exception(Marshal.GetLastWin32Error()).Message);
}
return(bytesRead);
}
public static unsafe long GetFilePointer(FileHandle fileHandle)
{
int lowOffsetDword = 0, highOffsetDword = 0;
lowOffsetDword = Win32.SetFilePointer(fileHandle, lowOffsetDword, &highOffsetDword, (int)SeekOrigin.Current);
if (lowOffsetDword != (int)Win32.INVALID_HANDLE_VALUE)
{
return(Data.JoinToLong(highOffsetDword, lowOffsetDword));
}
var errorCode = Marshal.GetLastWin32Error();
if (errorCode != Win32.NO_ERROR)
{
throw new FileSystemException(fileHandle.FileFullName, new Win32Exception(errorCode).Message);
}
return(Data.JoinToLong(highOffsetDword, lowOffsetDword));
}
public static unsafe bool SetFilePointer(FileHandle fileHandle, long offset)
{
var lowOffsetDword = (int)offset;
var highOffsetDword = (int)(offset >> 32);
lowOffsetDword = Win32.SetFilePointer(fileHandle, lowOffsetDword, &highOffsetDword, (int)SeekOrigin.Begin);
if (lowOffsetDword != (int)Win32.INVALID_HANDLE_VALUE)
{
return(true);
}
var errorCode = Marshal.GetLastWin32Error();
if (errorCode != Win32.NO_ERROR)
{
throw new FileSystemException(fileHandle.FileFullName, new Win32Exception(errorCode).Message);
}
return(true);
}
