Function getDataReader

functional_tests.go:347–362

read data from file if it exists or optionally create a buffer of particular size

(fileName string)

// read data from file if it exists or optionally create a buffer of particular size
func getDataReader(fileName string) io.ReadCloser {
	if mintDataDir == "" {
		size := int64(dataFileMap[fileName])
		if _, ok := dataFileCRC32[fileName]; !ok {
			dataFileCRC32[fileName] = mustCrcReader(newRandomReader(size, size))
		}
		return io.NopCloser(newRandomReader(size, size))
	}
	reader, _ := os.Open(getMintDataDirFilePath(fileName))
	if _, ok := dataFileCRC32[fileName]; !ok {
		dataFileCRC32[fileName] = mustCrcReader(reader)
		reader.Close()
		reader, _ = os.Open(getMintDataDirFilePath(fileName))
	}
	return reader
}

// randString generates random names and prepends them with a known prefix.
func randString(n int, src rand.Source, prefix string) string {