sparsefile

func Decode ¶

func Decode(in io.Reader, destPath string) error

Decode reads an SPF1‑encoded sparse file from in and reconstructs the original sparse layout at destPath. It recreates the file with the recorded logical size and writes only the stored extents at their original offsets so that holes remain sparse on supported filesystems.

func Encode ¶

func Encode(path string, out io.Writer) error

Encode reads a potentially sparse file from the given path and writes a compact representation of its non‑hole data extents to out using the custom SPF1 format. The output format is:

magic(4) | size(uint64) | count(uint64) |
repeated count times: offset(uint64) | length(uint64) | raw data bytes.