//go:build !linux

package httpdl

import "os"

// allocate is the portable fallback: fallocate is Linux-specific, so on other
// platforms prealloc/falloc degrade to a plain truncate.
func allocate(f *os.File, mode string, size int64) error {
	if mode == "none" {
		return nil
	}
	return f.Truncate(size)
}