File::SetFilePosition

Sets the current read/write position for a file.

uint64 SetFilePosition(int64 position, FilePositioningMode mode = kFileBegin);

position	The position, in bytes, at which the next read or write operation will take place. The interpretation of this position depends on the value of the mode parameter.
mode	Specifies how the position parameter is interpreted using one of the file positioning modes listed below.

The SetFilePosition function sets the current position within the file, in bytes, at which the next read or write operation will take place. The mode parameter specifies the position relative to which the position parameter is applied and may be one of the following constants.

kFileBegin	The new position is relative to the beginning of the file.
kFileCurrent	The new position is relative to the current position.
kFileEnd	The new position is relative to the end of the file.

The return value is the new absolute read/write position.

File::GetFilePosition

File::GetFileSize