func SaveThumbnailAndImage(imgr io.ReadSeeker, maxw, maxh int, tdir, dir, fname string) (tname, name string, err error) {
var resized bool
tname, resized, err = saveThumbnail(imgr, maxw, maxh, tdir, fname)
if err != nil {
return
}
var source io.Reader
var file *os.File
if resized {
imgr.Seek(0, 0)
var s224 = sha256.New224()
if _, err = io.Copy(s224, imgr); err != nil {
return
}
hash := make([]byte, 0, sha256.Size224)
hash = s224.Sum(hash)
name = fmt.Sprintf("%x%s", hash, path.Ext(tname))
imgr.Seek(0, 0)
if _, err = os.Stat(dir + name); err == nil {
return
} else if !os.IsNotExist(err) {
return
}
source = imgr
} else {
var sourcefile *os.File
if sourcefile, err = os.Open(util.AddDirTrailSlash(tdir) + tname); err != nil {
return
}
defer sourcefile.Close()
source = sourcefile
name = tname
}
if file, err = os.Create(dir + name); err != nil {
return
}
defer file.Close()
_, err = io.Copy(file, source)
return
}
func saveThumbnail(imgr io.ReadSeeker, maxw, maxh int, dir, fname string) (name string, resized bool, err error) {
dir = util.AddDirTrailSlash(dir)
fname = strings.TrimSpace(fname)
var (
img image.Image
imgf string
imgc image.Config
file *os.File
rdr io.Reader = imgr
)
if imgc, imgf, err = image.DecodeConfig(imgr); err != nil {
return
}
if imgf == "jpeg" {
imgf = "jpg"
}
if imgc.Width*imgc.Height > 100000000 {
// image is bigger than 100megapixels
err = ErrImageExceedSize
return
} else if imgc.Width > maxw || imgc.Height > maxh {
imgr.Seek(0, 0)
if img, _, err = image.Decode(imgr); err != nil {
return
}
img = resize.Thumbnail(uint(maxw), uint(maxh), img, resize.Bicubic)
resized = true
}
if fname == "" {
var s224 = sha256.New224()
if img != nil {
buf := &bytes.Buffer{}
writer := io.MultiWriter(s224, buf)
if err = EncodeImg(writer, img, imgf); err != nil {
return
}
img = nil
rdr = buf
} else {
if _, err = io.Copy(s224, imgr); err != nil {
return
}
imgr.Seek(0, 0)
}
hash := make([]byte, 0, sha256.Size224)
hash = s224.Sum(hash)
name = fmt.Sprintf("%x.%s", hash, imgf)
if _, err = os.Stat(dir + name); err == nil {
return
} else if !os.IsNotExist(err) {
return
}
} else {
name = fname + "." + imgf
if _, err = os.Stat(dir + name); err == nil {
err = os.ErrExist
return
} else if !os.IsNotExist(err) {
return
}
}
if file, err = os.Create(dir + name); err != nil {
return
}
defer file.Close()
if img != nil {
EncodeImg(file, img, imgf)
} else {
_, err = io.Copy(file, rdr)
}
return
}