internal: move packages under this directory (#5836)

* Rename pkg -> internal

* Rename routes -> route

* Move route -> internal/route

* Rename models -> db

* Move db -> internal/db

* Fix route2 -> route

* Move cmd -> internal/cmd

* Bump version

1 files changed, 77 insertions, 0 deletions

diff --git a/internal/tool/file.go b/internal/tool/file.go
new file mode 100644
index 00000000..6ca4136a
--- /dev/null
+++ b/internal/tool/file.go
@@ -0,0 +1,77 @@
+// Copyright 2017 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package tool
+
+import (
+	"fmt"
+	"math"
+	"net/http"
+	"strings"
+)
+
+// IsTextFile returns true if file content format is plain text or empty.
+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)
+}
+
+// FileSize calculates the file size and generate user-friendly string.
+func FileSize(s int64) string {
+	sizes := []string{"B", "KB", "MB", "GB", "TB", "PB", "EB"}
+	return humanateBytes(uint64(s), 1024, sizes)
+}