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units.go
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units.go
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package units
import (
"fmt"
"strconv"
)
func handleOverflow(val int64, mult int64) (int64, error) {
result := val * mult
if val == 0 || mult == 0 || val == 1 || mult == 1 {
return result, nil
}
if val != 0 && (result/val) != mult {
return -1, fmt.Errorf("Overflow multiplying %d with %d", val, mult)
}
return result, nil
}
// ParseByteSizeString parses a human representation of an amount of
// data into a number of bytes.
func ParseByteSizeString(input string) (int64, error) {
// Empty input
if input == "" {
return 0, nil
}
// Find where the suffix begins
suffixLen := 0
for i, chr := range []byte(input) {
_, err := strconv.Atoi(string([]byte{chr}))
if err != nil {
suffixLen = len(input) - i
break
}
}
if suffixLen == len(input) {
return -1, fmt.Errorf("Invalid value: %s", input)
}
// Extract the suffix
suffix := input[len(input)-suffixLen:]
// Extract the value
value := input[0 : len(input)-suffixLen]
valueInt, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return -1, fmt.Errorf("Invalid integer: %s", input)
}
// Figure out the multiplicator
multiplicator := int64(0)
switch suffix {
case "", "B", " bytes":
multiplicator = 1
case "kB":
multiplicator = 1000
case "MB":
multiplicator = 1000 * 1000
case "GB":
multiplicator = 1000 * 1000 * 1000
case "TB":
multiplicator = 1000 * 1000 * 1000 * 1000
case "PB":
multiplicator = 1000 * 1000 * 1000 * 1000 * 1000
case "EB":
multiplicator = 1000 * 1000 * 1000 * 1000 * 1000 * 1000
case "KiB":
multiplicator = 1024
case "MiB":
multiplicator = 1024 * 1024
case "GiB":
multiplicator = 1024 * 1024 * 1024
case "TiB":
multiplicator = 1024 * 1024 * 1024 * 1024
case "PiB":
multiplicator = 1024 * 1024 * 1024 * 1024 * 1024
case "EiB":
multiplicator = 1024 * 1024 * 1024 * 1024 * 1024 * 1024
default:
return -1, fmt.Errorf("Invalid value: %s", input)
}
return handleOverflow(valueInt, multiplicator)
}
// ParseBitSizeString parses a human representation of an amount of
// data into a number of bits.
func ParseBitSizeString(input string) (int64, error) {
// Empty input
if input == "" {
return 0, nil
}
// Find where the suffix begins
suffixLen := 0
for i, chr := range []byte(input) {
_, err := strconv.Atoi(string([]byte{chr}))
if err != nil {
suffixLen = len(input) - i
break
}
}
if suffixLen == len(input) {
return -1, fmt.Errorf("Invalid value: %s", input)
}
// Extract the suffix
suffix := input[len(input)-suffixLen:]
// Extract the value
value := input[0 : len(input)-suffixLen]
valueInt, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return -1, fmt.Errorf("Invalid integer: %s", input)
}
// Figure out the multiplicator
multiplicator := int64(0)
switch suffix {
case "", "bit":
multiplicator = 1
case "kbit":
multiplicator = 1000
case "Mbit":
multiplicator = 1000 * 1000
case "Gbit":
multiplicator = 1000 * 1000 * 1000
case "Tbit":
multiplicator = 1000 * 1000 * 1000 * 1000
case "Pbit":
multiplicator = 1000 * 1000 * 1000 * 1000 * 1000
case "Ebit":
multiplicator = 1000 * 1000 * 1000 * 1000 * 1000 * 1000
case "Kibit":
multiplicator = 1024
case "Mibit":
multiplicator = 1024 * 1024
case "Gibit":
multiplicator = 1024 * 1024 * 1024
case "Tibit":
multiplicator = 1024 * 1024 * 1024 * 1024
case "Pibit":
multiplicator = 1024 * 1024 * 1024 * 1024 * 1024
case "Eibit":
multiplicator = 1024 * 1024 * 1024 * 1024 * 1024 * 1024
default:
return -1, fmt.Errorf("Unsupported suffix: %s", suffix)
}
return handleOverflow(valueInt, multiplicator)
}
// GetByteSizeString takes a number of bytes and precision and returns a
// human representation of the amount of data.
func GetByteSizeString(input int64, precision uint) string {
if input < 1000 {
return fmt.Sprintf("%dB", input)
}
value := float64(input)
for _, unit := range []string{"kB", "MB", "GB", "TB", "PB", "EB"} {
value = value / 1000
if value < 1000 {
return fmt.Sprintf("%.*f%s", precision, value, unit)
}
}
return fmt.Sprintf("%.*fEB", precision, value)
}
// GetByteSizeStringIEC takes a number of bytes and precision and returns a
// human representation of the amount of data using IEC units.
func GetByteSizeStringIEC(input int64, precision uint) string {
if input < 1024 {
return fmt.Sprintf("%dB", input)
}
value := float64(input)
for _, unit := range []string{"KiB", "MiB", "GiB", "TiB", "PiB", "EiB"} {
value = value / 1024
if value < 1024 {
return fmt.Sprintf("%.*f%s", precision, value, unit)
}
}
return fmt.Sprintf("%.*fEB", precision, value)
}