新增系统概况

libs/file.go

@@ -0,0 +1,88 @@
+/************************************************************
+** @Description: libs
+** @Author: george hao
+** @Date:   2018-08-13 11:17
+** @Last Modified by:  george hao
+** @Last Modified time: 2018-08-13 11:17
+*************************************************************/
+package libs
+
+import (
+	"fmt"
+	"math"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func Exist(path string) bool {
+	_, err := os.Stat(path)
+	return err == nil || os.IsExist(err)
+}
+
+func GetCurrentDirectory() (string, error) {
+	dir, err := filepath.Abs(filepath.Dir(os.Args[0]))
+	if err != nil {
+		return "", err
+	}
+	return filepath.Clean(strings.Replace(dir, "\\", "/", -1)), nil
+
+}
+
+func IsTextFile(data []byte) bool {
+	if len(data) == 0 {
+		return true
+	}
+	return strings.Contains(http.DetectContentType(data), "text/")
+}
+func IsImageFile(data []byte) bool {
+	return strings.Contains(http.DetectContentType(data), "image/")
+}
+func IsPDFFile(data []byte) bool {
+	return strings.Contains(http.DetectContentType(data), "application/pdf")
+}
+func IsVideoFile(data []byte) bool {
+	return strings.Contains(http.DetectContentType(data), "video/")
+}
+
+const (
+	Byte  = 1
+	KByte = Byte * 1024
+	MByte = KByte * 1024
+	GByte = MByte * 1024
+	TByte = GByte * 1024
+	PByte = TByte * 1024
+	EByte = PByte * 1024
+)
+
+var bytesSizeTable = map[string]uint64{
+	"b":  Byte,
+	"kb": KByte,
+	"mb": MByte,
+	"gb": GByte,
+	"tb": TByte,
+	"pb": PByte,
+	"eb": EByte,
+}
+
+func logn(n, b float64) float64 {
+	return math.Log(n) / math.Log(b)
+}
+func humanateBytes(s uint64, base float64, sizes []string) string {
+	if s < 10 {
+		return fmt.Sprintf("%d B", s)
+	}
+	e := math.Floor(logn(float64(s), base))
+	suffix := sizes[int(e)]
+	val := float64(s) / math.Pow(base, math.Floor(e))
+	f := "%.0f"
+	if val < 10 {
+		f = "%.1f"
+	}
+	return fmt.Sprintf(f+" %s", val, suffix)
+}
+func FileSize(s int64) string {
+	sizes := []string{"B", "KB", "MB", "GB", "TB", "PB", "EB"}
+	return humanateBytes(uint64(s), 1024, sizes)
+}