Seek within an SDL_RWops data stream.
Sint64 SDL_RWseek(SDL_RWops *context,int whence); Sint64 offset,
|context||a pointer to an SDL_RWops structure|
|offset||an offset in bytes, relative to whence location; can be negative|
Returns the final offset in the data stream after the seek or -1 on error.
This function seeks to byte
offset, relative to
whence may be any of the following values:
RW_SEEK_SET: seek from the beginning of data
RW_SEEK_CUR: seek relative to current read point
RW_SEEK_END: seek relative to the end of data
If this stream can not seek, it will return -1.
SDL_RWseek() is actually a wrapper function that calls the SDL_RWops's
seek method appropriately, to simplify application development.
Prior to SDL 2.0.10, this function was a macro.
This function is available since SDL 2.0.10.