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tools.go
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/
tools.go
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package utils
import (
"bytes"
"encoding/hex"
"image"
// 解析 gif 图片信息
_ "image/gif"
// 解析 jpg 图片信息
_ "image/jpeg"
// 解析 png 图片信息
_ "image/png"
l "log"
"math/rand"
"time"
)
var log Logger = l.Default()
// Logger 日志接口
type Logger interface {
Println(v ...interface{})
Printf(format string, v ...interface{})
}
// SetLogger 设置日志记录器
func SetLogger(logger Logger) {
log = logger
}
// ImageSize 获取图片尺寸
func ImageSize(file []byte) (width, height int, err error) {
reader := bytes.NewReader(file)
img, _, err := image.DecodeConfig(reader)
if err != nil {
return
}
return img.Width, img.Height, err
}
// RandHex 生成随机十六进制字符串
func RandHex(n int) []byte {
rand.Seed(time.Now().Unix())
if n <= 0 {
return []byte{}
}
var need int
if n&1 == 0 {
need = n
} else {
need = n + 1
}
size := need / 2
dst := make([]byte, need)
src := dst[size:]
if _, err := rand.Read(src[:]); err != nil {
return []byte{}
}
hex.Encode(dst, src)
return dst[:n]
}