blog_proto_writefunc.go

func writeOps(outfile string) error {
	f, err := os.OpenFile(outfile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
	if err != nil {
		log.Fatalf("Failed to create file %s", err.Error())
	}
	defer f.Close()

	op1 := &typedefs.Patch_Copy{Start: 10, End: 100}
	op2 := &typedefs.Patch_Insert{RawBytes: []byte{'a', 'b', 'c', 'd', 'e', 'a', 'b', 'c', 'd', 'e'}}
	ops := []*typedefs.Patch{
		{Op: &typedefs.Patch_CopyOp{CopyOp: op1}},
		{Op: &typedefs.Patch_InsertOp{InsertOp: op2}},
	}
	patchins := &typedefs.Instructions{Operations: ops}

	out, err := proto.Marshal(patchins)
	if err != nil {
		return err
	}
	_, err = f.Write(out)
	if err != nil {
		return err
	}

	return nil
}