package torrent import ( "io" "launchpad.net/gommap" ) type MMap struct { gommap.MMap } func (me MMap) Size() int64 { return int64(len(me.MMap)) } type MMapSpan []MMap func (me MMapSpan) span() (s span) { for _, mmap := range me { s = append(s, mmap) } return } func (me MMapSpan) Close() { for _, mMap := range me { mMap.UnsafeUnmap() } } func (me MMapSpan) Size() (ret int64) { for _, mmap := range me { ret += mmap.Size() } return } func (me MMapSpan) ReadAt(p []byte, off int64) (n int, err error) { me.span().ApplyTo(off, func(intervalOffset int64, interval sizer) (stop bool) { _n := copy(p, interval.(MMap).MMap[intervalOffset:]) p = p[_n:] n += _n return len(p) == 0 }) if len(p) != 0 { err = io.EOF } return } func (me MMapSpan) WriteAt(p []byte, off int64) (n int, err error) { me.span().ApplyTo(off, func(iOff int64, i sizer) (stop bool) { _n := copy(i.(MMap).MMap[iOff:], p) p = p[_n:] n += _n return len(p) == 0 }) if len(p) != 0 { err = io.ErrShortWrite } return }