/
hashdir.go
99 lines (87 loc) · 1.76 KB
/
hashdir.go
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package gohashdir
import (
"errors"
"fmt"
"log"
"os"
"path/filepath"
"strconv"
)
const SLASH string = "/"
const HASH_FORMAT = "%016x"
func uint64ToHashPath(width int, n uint64) (string, error) {
if width < 1 {
return "", errors.New("Width cannot be less than zero")
}
s := fmt.Sprintf(HASH_FORMAT, n)
return StringToDirsString(width, s)
}
func StringToDirsString(width int, s string) (string, error) {
if width < 1 {
return "", errors.New("Width cannot be less than zero")
}
dirs := ""
for i, c := range s {
if i != 0 && i%width == 0 {
dirs += SLASH
}
ch, err := strconv.Unquote(strconv.QuoteRune(c))
if err != nil {
return "", err
}
dirs += ch
}
dirs += SLASH
return filepath.FromSlash(dirs), nil
}
func baseDirExists(baseDir string) error {
_, err := os.Stat(baseDir)
if err != nil {
return err
}
return nil
}
func makeDir(dir string) (existed bool, err error) {
var stat os.FileInfo
stat, err = os.Stat(dir)
if os.IsNotExist(err) {
existed = false
err = os.MkdirAll(dir, 0755)
if err != nil {
dir = ""
}
} else {
if stat != nil {
existed = true
}
}
return
}
func HashDirString(baseDir string, width int, s string) (dir string, existed bool, err error) {
err = baseDirExists(baseDir)
if err != nil {
return
}
dir, err = StringToDirsString(width, s)
if err != nil {
return
}
dir = baseDir + "/" + dir
existed, err = makeDir(dir)
log.Println(dir)
return
}
func HashDir(baseDir string, width int, n uint64) (dir string, existed bool, err error) {
if width < 1 {
return "", false, errors.New("Width cannot be less than zero")
}
err = baseDirExists(baseDir)
if err != nil {
return
}
existed = false
dir, err = uint64ToHashPath(width, n)
dir = baseDir + "/" + dir
existed, err = makeDir(dir)
return
}