Function NewWrapReader

wrapio/wrap.go:75–83

NewWrapReader creates a WrapReader starting at offset off, and wrapping at offset wrapAt.

(r io.ReaderAt, off int64, wrapAt int64)

// NewWrapReader creates a WrapReader starting at offset off, and wrapping at offset wrapAt.
func NewWrapReader(r io.ReaderAt, off int64, wrapAt int64) *WrapReader {
	return &WrapReader{
		&wrapper{
			doat:   r.ReadAt,
			off:    (off % wrapAt),
			wrapAt: wrapAt,
		},
	}
}

// Read reads into p starting at the current offset, wrapping if it reaches the end.
// The current offset is shifted forward by the amount read.