package restic import ( "context" "io" "github.com/restic/restic/internal/debug" ) type backendReaderAt struct { be Backend h Handle } func (brd backendReaderAt) ReadAt(p []byte, offset int64) (n int, err error) { return ReadAt(context.TODO(), brd.be, brd.h, offset, p) } // ReaderAt returns an io.ReaderAt for a file in the backend. func ReaderAt(be Backend, h Handle) io.ReaderAt { return backendReaderAt{be: be, h: h} } // ReadAt reads from the backend handle h at the given position. func ReadAt(ctx context.Context, be Backend, h Handle, offset int64, p []byte) (n int, err error) { debug.Log("ReadAt(%v) at %v, len %v", h, offset, len(p)) rd, err := be.Load(ctx, h, len(p), offset) if err != nil { return 0, err } n, err = io.ReadFull(rd, p) e := rd.Close() if err == nil { err = e } debug.Log("ReadAt(%v) ReadFull returned %v bytes", h, n) return n, err }