fix chunk.ModifiedTsNs (#4264)

* fix

* fix mtime s > ns

---------

Co-authored-by: zemul <zhouzemiao@ihuman.com>

weed/images/cropping.go

@@ -1,47 +1,47 @@
-package images
-
-import (
-	"bytes"
-	"image"
-	"image/gif"
-	"image/jpeg"
-	"image/png"
-	"io"
-
-	"github.com/disintegration/imaging"
-
-	"github.com/seaweedfs/seaweedfs/weed/glog"
-)
-
-func Cropped(ext string, read io.ReadSeeker, x1, y1, x2, y2 int) (cropped io.ReadSeeker, err error) {
-	srcImage, _, err := image.Decode(read)
-	if err != nil {
-		glog.Error(err)
-		return read, err
-	}
-
-	bounds := srcImage.Bounds()
-	if x2 > bounds.Dx() || y2 > bounds.Dy() {
-		read.Seek(0, 0)
-		return read, nil
-	}
-
-	rectangle := image.Rect(x1, y1, x2, y2)
-	dstImage := imaging.Crop(srcImage, rectangle)
-	var buf bytes.Buffer
-	switch ext {
-	case ".jpg", ".jpeg":
-		if err = jpeg.Encode(&buf, dstImage, nil); err != nil {
-			glog.Error(err)
-		}
-	case ".png":
-		if err = png.Encode(&buf, dstImage); err != nil {
-			glog.Error(err)
-		}
-	case ".gif":
-		if err = gif.Encode(&buf, dstImage, nil); err != nil {
-			glog.Error(err)
-		}
-	}
-	return bytes.NewReader(buf.Bytes()), err
-}
+package images
+
+import (
+	"bytes"
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"io"
+
+	"github.com/disintegration/imaging"
+
+	"github.com/seaweedfs/seaweedfs/weed/glog"
+)
+
+func Cropped(ext string, read io.ReadSeeker, x1, y1, x2, y2 int) (cropped io.ReadSeeker, err error) {
+	srcImage, _, err := image.Decode(read)
+	if err != nil {
+		glog.Error(err)
+		return read, err
+	}
+
+	bounds := srcImage.Bounds()
+	if x2 > bounds.Dx() || y2 > bounds.Dy() {
+		read.Seek(0, 0)
+		return read, nil
+	}
+
+	rectangle := image.Rect(x1, y1, x2, y2)
+	dstImage := imaging.Crop(srcImage, rectangle)
+	var buf bytes.Buffer
+	switch ext {
+	case ".jpg", ".jpeg":
+		if err = jpeg.Encode(&buf, dstImage, nil); err != nil {
+			glog.Error(err)
+		}
+	case ".png":
+		if err = png.Encode(&buf, dstImage); err != nil {
+			glog.Error(err)
+		}
+	case ".gif":
+		if err = gif.Encode(&buf, dstImage, nil); err != nil {
+			glog.Error(err)
+		}
+	}
+	return bytes.NewReader(buf.Bytes()), err
+}