78 lines
1.6 KiB
Go
78 lines
1.6 KiB
Go
// Copyright 2017 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package base
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import (
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"fmt"
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"math"
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"net/http"
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"strings"
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)
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// IsTextFile returns true if file content format is plain text or empty.
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func IsTextFile(data []byte) bool {
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if len(data) == 0 {
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return true
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}
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return strings.Contains(http.DetectContentType(data), "text/")
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}
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func IsImageFile(data []byte) bool {
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return strings.Contains(http.DetectContentType(data), "image/")
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}
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func IsPDFFile(data []byte) bool {
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return strings.Contains(http.DetectContentType(data), "application/pdf")
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}
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func IsVideoFile(data []byte) bool {
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return strings.Contains(http.DetectContentType(data), "video/")
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}
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const (
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Byte = 1
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KByte = Byte * 1024
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MByte = KByte * 1024
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GByte = MByte * 1024
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TByte = GByte * 1024
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PByte = TByte * 1024
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EByte = PByte * 1024
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)
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var bytesSizeTable = map[string]uint64{
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"b": Byte,
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"kb": KByte,
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"mb": MByte,
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"gb": GByte,
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"tb": TByte,
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"pb": PByte,
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"eb": EByte,
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}
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func logn(n, b float64) float64 {
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return math.Log(n) / math.Log(b)
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}
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func humanateBytes(s uint64, base float64, sizes []string) string {
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if s < 10 {
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return fmt.Sprintf("%d B", s)
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}
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e := math.Floor(logn(float64(s), base))
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suffix := sizes[int(e)]
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val := float64(s) / math.Pow(base, math.Floor(e))
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f := "%.0f"
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if val < 10 {
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f = "%.1f"
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}
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return fmt.Sprintf(f+" %s", val, suffix)
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}
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// FileSize calculates the file size and generate user-friendly string.
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func FileSize(s int64) string {
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sizes := []string{"B", "KB", "MB", "GB", "TB", "PB", "EB"}
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return humanateBytes(uint64(s), 1024, sizes)
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}
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