package apple2 import ( "io" "io/ioutil" "net/http" "os" "strings" "github.com/ivanizag/apple2/romdumps" ) const ( internalPrefix = "/" httpPrefix = "http://" httpsPrefix = "https://" ) func isInternalResource(filename string) bool { return strings.HasPrefix(filename, internalPrefix) } func isHTTPResource(filename string) bool { return strings.HasPrefix(filename, httpPrefix) || strings.HasPrefix(filename, httpsPrefix) } func loadResource(filename string) ([]uint8, error) { var file io.Reader if isInternalResource(filename) { // load from embedded resource resource := strings.TrimPrefix(filename, internalPrefix) resourceFile, err := romdumps.Assets.Open(resource) if err != nil { return nil, err } defer resourceFile.Close() file = resourceFile } else if isHTTPResource(filename) { response, err := http.Get(filename) if err != nil { return nil, err } defer response.Body.Close() file = response.Body } else { diskFile, err := os.Open(filename) if err != nil { return nil, err } defer diskFile.Close() file = diskFile } data, err := ioutil.ReadAll(file) if err != nil { return nil, err } return data, nil }