b5dee24bb6
Device Mapper needs device sizes in binary (1024) multiples. Otherwise kernel checks can find that the specified thin-pool device sizes aren't a multiple of the specified thin-pool blocksize. The name for "RAMInBytes" is likely too narrow given the new consumers but... Also add "tebibyte" support to RAMInBytes. Docker-DCO-1.1-Signed-off-by: Mike Snitzer <snitzer@redhat.com> (github: snitm)
94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
package units
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import (
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"fmt"
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"regexp"
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"strconv"
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"strings"
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)
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// HumanSize returns a human-readable approximation of a size
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// using SI standard (eg. "44kB", "17MB")
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func HumanSize(size int64) string {
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i := 0
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var sizef float64
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sizef = float64(size)
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units := []string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"}
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for sizef >= 1000.0 {
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sizef = sizef / 1000.0
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i++
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}
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return fmt.Sprintf("%.4g %s", sizef, units[i])
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}
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// FromHumanSize returns an integer from a human-readable specification of a size
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// using SI standard (eg. "44kB", "17MB")
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func FromHumanSize(size string) (int64, error) {
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re, error := regexp.Compile("^(\\d+)([kKmMgGtTpP])?[bB]?$")
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if error != nil {
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return -1, fmt.Errorf("%s does not specify not a size", size)
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}
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matches := re.FindStringSubmatch(size)
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if len(matches) != 3 {
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return -1, fmt.Errorf("Invalid size: '%s'", size)
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}
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theSize, error := strconv.ParseInt(matches[1], 10, 0)
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if error != nil {
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return -1, error
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}
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unit := strings.ToLower(matches[2])
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if unit == "k" {
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theSize *= 1000
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} else if unit == "m" {
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theSize *= 1000 * 1000
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} else if unit == "g" {
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theSize *= 1000 * 1000 * 1000
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} else if unit == "t" {
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theSize *= 1000 * 1000 * 1000 * 1000
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} else if unit == "p" {
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theSize *= 1000 * 1000 * 1000 * 1000 * 1000
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}
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return theSize, nil
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}
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// Parses a human-readable string representing an amount of RAM
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// in bytes, kibibytes, mebibytes, gibibytes, or tebibytes and
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// returns the number of bytes, or -1 if the string is unparseable.
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// Units are case-insensitive, and the 'b' suffix is optional.
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func RAMInBytes(size string) (bytes int64, err error) {
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re, error := regexp.Compile("^(\\d+)([kKmMgGtT])?[bB]?$")
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if error != nil {
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return -1, error
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}
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matches := re.FindStringSubmatch(size)
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if len(matches) != 3 {
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return -1, fmt.Errorf("Invalid size: '%s'", size)
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}
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memLimit, error := strconv.ParseInt(matches[1], 10, 0)
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if error != nil {
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return -1, error
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}
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unit := strings.ToLower(matches[2])
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if unit == "k" {
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memLimit *= 1024
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} else if unit == "m" {
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memLimit *= 1024 * 1024
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} else if unit == "g" {
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memLimit *= 1024 * 1024 * 1024
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} else if unit == "t" {
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memLimit *= 1024 * 1024 * 1024 * 1024
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}
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return memLimit, nil
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}
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