Add a new feature of limitSize.

rest/util_string.go

@@ -0,0 +1,36 @@
+package rest
+
+import (
+	"fmt"
+	"strconv"
+)
+
+//把一个大小转变成方便读的格式
+//human readable file size
+func HumanFileSize(bytes int64, si bool) string {
+	var thresh int64 = 1000
+	if si {
+		thresh = 1024
+	}
+	if bytes < 0 {
+		bytes = 0
+	}
+	if bytes < thresh {
+		return fmt.Sprintf("%dB", bytes)
+	}
+	var units = []string{"kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"}
+	if si {
+		units = []string{"KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"}
+	}
+	var u = 0
+	var tmp = float64(bytes)
+	var standard = float64(thresh)
+	for tmp >= standard && u < len(units)-1 {
+		tmp /= float64(standard)
+		u++
+	}
+
+	numStr := strconv.FormatFloat(tmp, 'f', 1, 64)
+
+	return fmt.Sprintf("%s%s", numStr, units[u])
+}