public static unsafe bool TryReadFileHeader(FileHeader *header, VoronPathSetting path)
{
var fd = Syscall.open(path.FullPath, OpenFlags.O_RDONLY, FilePermissions.S_IRUSR);
try
{
if (fd == -1)
{
var lastError = Marshal.GetLastWin32Error();
if (((Errno)lastError) == Errno.EACCES)
{
return(false);
}
Syscall.ThrowLastError(lastError);
}
int remaining = sizeof(FileHeader);
var ptr = ((byte *)header);
while (remaining > 0)
{
var read = Syscall.read(fd, ptr, (ulong)remaining);
if (read == -1)
{
var err = Marshal.GetLastWin32Error();
Syscall.ThrowLastError(err);
}
if (read == 0)
{
return(false); // truncated file?
}
remaining -= (int)read;
ptr += read;
}
return(true);
}
finally
{
if (fd != -1)
{
Syscall.close(fd);
fd = -1;
}
}
}