for left > 0 {
		// Read expected hash...
		h.Reset()
		n, err := io.ReadFull(r, hashBuf)
		if err != nil {
			// Read's failed for object with right size, file is corrupt.
			return err
		}
		// Subtract hash length..
		left -= int64(n)
		if left < shardSize {
			shardSize = left
		}

		read, err := io.CopyBuffer(h, io.LimitReader(r, shardSize), *bufp)
		if err != nil {

		// console.Debugf("compacting %v, removing %d children\n", candidate, removing)

		flat.Compacted = true
		d.deleteRecursive(candidate)
		d.replaceHashed(candidate, nil, *flat)

		// Remove top entry and subtract removed children.
		remove -= removing
		leaves = leaves[1:]
	}
}

// StringAll returns a detailed string representation of all entries in the cache.
func (d *dataUsageCache) StringAll() string {