initj

esiconv/main.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"log"
+	"os"
+	"path"
+
+	"github.com/kayteh/esi"
+)
+
+func main() {
+	convPath := os.Args[1]
+	outPath := os.Args[2]
+
+	fin, err := os.Open(convPath)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	fout, err := os.OpenFile(outPath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	img, _, err := image.Decode(fin)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	fin.Close()
+
+	ext := path.Ext(outPath)
+	switch ext[1:] {
+	case "esi":
+		err = esi.Encode(fout, img)
+	case "png":
+		err = png.Encode(fout, img)
+	case "jpg":
+		fallthrough
+	case "jpeg":
+		err = jpeg.Encode(fout, img, nil)
+	case "gif":
+		err = gif.Encode(fout, img, nil)
+	default:
+		log.Fatalf("extension %s unknown", ext)
+	}
+
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	fout.Close()
+}