Added file decoding

reused protocol file type detection

go.mod

@@ -73,6 +73,8 @@ require (
 	go.uber.org/zap v1.13.0
 	golang.org/x/crypto v0.0.0-20191122220453-ac88ee75c92c
 	golang.org/x/image v0.0.0-20200927104501-e162460cd6b5 // indirect
+	golang.org/x/net v0.0.0-20191119073136-fc4aabc6c914 // indirect
+	golang.org/x/text v0.3.3 // indirect
 	golang.org/x/time v0.0.0-20191024005414-555d28b269f0 // indirect
 	golang.org/x/tools v0.0.0-20200211045251-2de505fc5306 // indirect
 	google.golang.org/genproto v0.0.0-20191115221424-83cc0476cb11 // indirect

go.sum

@@ -861,6 +861,8 @@ golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=

images/files.go

@@ -1,10 +1,16 @@
 package images
 
 import (
+	"errors"
 	"image"
+	"image/gif"
 	"image/jpeg"
+	"image/png"
 	"io"
+	"net/http"
 	"os"
+
+	"golang.org/x/image/webp"
 )
 
 func Get(fileName string) (image.Image, error) {
@@ -14,19 +20,28 @@ func Get(fileName string) (image.Image, error) {
 	}
 	defer file.Close()
 
-	switch getFileType(file) {
-	case JPEG:
-		err = decodeJpeg(file)
-		break
-	case PNG:
-		err = decodePng(file)
-		break
-	case WEBP:
-		err = decodeWebp(file)
-		break
+	fb := make([]byte, 12)
+	file.Read(fb)
+	ft := GetFileType(fb)
+	if ft == UNKNOWN {
+		return nil, errors.New("unsupported file type")
 	}
 
-	img, err := jpeg.Decode(file)
+	var img image.Image
+	switch ft {
+	case JPEG:
+		img, err = jpeg.Decode(file)
+		break
+	case PNG:
+		img, err = png.Decode(file)
+		break
+	case GIF:
+		img, err = gif.Decode(file)
+		break
+	case WEBP:
+		img, err = webp.Decode(file)
+		break
+	}
 	if err != nil {
 		return nil, err
 	}
@@ -34,6 +49,45 @@ func Get(fileName string) (image.Image, error) {
 	return img, nil
 }
 
+func GetFileType(buf []byte) FileType {
+	switch {
+	case isJpeg(buf):
+		return JPEG
+	case isPng(buf):
+		return PNG
+	case isGif(buf):
+		return GIF
+	case isWebp(buf):
+		return WEBP
+	default:
+		return UNKNOWN
+	}
+}
+
+func isJpeg(buf []byte) bool {
+	return len(buf) > 2 &&
+		buf[0] == 0xFF &&
+		buf[1] == 0xD8 &&
+		buf[2] == 0xFF
+}
+
+func isPng(buf []byte) bool {
+	return len(buf) > 3 &&
+		buf[0] == 0x89 && buf[1] == 0x50 &&
+		buf[2] == 0x4E && buf[3] == 0x47
+}
+
+func isGif(buf []byte) bool {
+	return len(buf) > 2 &&
+		buf[0] == 0x47 && buf[1] == 0x49 && buf[2] == 0x46
+}
+
+func isWebp(buf []byte) bool {
+	return len(buf) > 11 &&
+		buf[8] == 0x57 && buf[9] == 0x45 &&
+		buf[10] == 0x42 && buf[11] == 0x50
+}
+
 func Render(img image.Image, imgDetail *Details) error {
 	out, err := os.Create(imgDetail.FileName)
 	if err != nil {
@@ -52,26 +106,6 @@ func Render(img image.Image, imgDetail *Details) error {
 	return nil
 }
 
-func getFileType(file *os.File) FileType {
-	// TODO
-	return JPEG
-}
-
-func decodeJpeg(file *os.File) error {
-	// TODO
-	return nil
-}
-
-func decodePng(file *os.File) error {
-	// TODO
-	return nil
-}
-
-func decodeWebp(file *os.File) error {
-	// TODO
-	return nil
-}
-
 func renderJpeg(w io.Writer, m image.Image, imgDetail *Details) error {
 	o := new(jpeg.Options)
 	o.Quality = imgDetail.Quality

images/meta.go

@@ -6,8 +6,10 @@ import (
 )
 
 const (
+	UNKNOWN FileType = 1 + iota
+
 	// Raster image types
-	JPEG FileType = 1 + iota
+	JPEG
 	PNG
 	GIF
 	WEBP

protocol/images/type.go

@@ -1,42 +1,19 @@
 package images
 
 import (
+	"github.com/status-im/status-go/images"
 	"github.com/status-im/status-go/protocol/protobuf"
 )
 
-func jpeg(buf []byte) bool {
-	return len(buf) > 2 &&
-		buf[0] == 0xFF &&
-		buf[1] == 0xD8 &&
-		buf[2] == 0xFF
-}
-
-func png(buf []byte) bool {
-	return len(buf) > 3 &&
-		buf[0] == 0x89 && buf[1] == 0x50 &&
-		buf[2] == 0x4E && buf[3] == 0x47
-}
-
-func gif(buf []byte) bool {
-	return len(buf) > 2 &&
-		buf[0] == 0x47 && buf[1] == 0x49 && buf[2] == 0x46
-}
-
-func webp(buf []byte) bool {
-	return len(buf) > 11 &&
-		buf[8] == 0x57 && buf[9] == 0x45 &&
-		buf[10] == 0x42 && buf[11] == 0x50
-}
-
 func ImageType(buf []byte) protobuf.ImageMessage_ImageType {
-	switch {
-	case jpeg(buf):
+	switch images.GetFileType(buf){
+	case images.JPEG:
 		return protobuf.ImageMessage_JPEG
-	case png(buf):
+	case images.PNG:
 		return protobuf.ImageMessage_PNG
-	case gif(buf):
+	case images.GIF:
 		return protobuf.ImageMessage_GIF
-	case webp(buf):
+	case images.WEBP:
 		return protobuf.ImageMessage_WEBP
 	default:
 		return protobuf.ImageMessage_UNKNOWN_IMAGE_TYPE