add jpeg unit tests

steganography_test.go

@@ -5,21 +5,24 @@ import (
 	"bytes"
 	"image"
 	"image/color"
+	"image/jpeg"
 	"log"
 	"os"
 	"testing"
 )
 
-var rawInputFile = "./examples/stegosaurus.png"
-var encodedInputFile = "./examples/encoded_stegosaurus.png"
+var rawInputFilePng = "./examples/stegosaurus.png"
+var rawInputFileJpg = "./examples/stegosaurus.jpg"
+var encodedInputFilePng = "./examples/encoded_stegosaurus.png"
+var encodedInputFileJpg = "./examples/encoded_stegosaurus.jpg"
 
 var bitmessage = []uint8{84, 104, 101, 113, 117, 97, 100, 114, 117, 112, 101, 100, 97, 108, 83, 116, 101, 103, 111, 115, 97, 117, 114, 117, 115, 105, 115, 111, 110, 101, 111, 102, 116, 104, 101, 109, 111, 115, 116, 101, 97, 115, 105, 108, 121, 105, 100, 101, 110, 116, 105, 102, 105, 97, 98, 108, 101, 100, 105, 110, 111, 115, 97, 117, 114, 103, 101, 110, 101, 114, 97, 44, 100, 117, 101, 116, 111, 116, 104, 101, 100, 105, 115, 116, 105, 110, 99, 116, 105, 118, 101, 100, 111, 117, 98, 108, 101, 114, 111, 119, 111, 102, 107, 105, 116, 101, 45, 115, 104, 97, 112, 101, 100, 112, 108, 97, 116, 101, 115, 114, 105, 115, 105, 110, 103, 118, 101, 114, 116, 105, 99, 97, 108, 108, 121, 97, 108, 111, 110, 103, 116, 104, 101, 114, 111, 117, 110, 100, 101, 100, 98, 97, 99, 107, 97, 110, 100, 116, 104, 101, 116, 119, 111, 112, 97, 105, 114, 115, 111, 102, 108, 111, 110, 103, 115, 112, 105, 107, 101, 115, 101, 120, 116, 101, 110, 100, 105, 110, 103, 104, 111, 114, 105, 122, 111, 110, 116, 97, 108, 108, 121, 110, 101, 97, 114, 116, 104, 101, 101, 110, 100, 111, 102, 116, 104, 101, 116, 97, 105, 108, 46, 65, 108, 116, 104, 111, 117, 103, 104, 108, 97, 114, 103, 101, 105, 110, 100, 105, 118, 105, 100, 117, 97, 108, 115, 99, 111, 117, 108, 100, 103, 114, 111, 119, 117, 112, 116, 111, 57, 109, 40, 50, 57, 46, 53, 102, 116, 41, 105, 110, 108, 101, 110, 103, 116, 104, 91, 52, 93, 97, 110, 100, 53, 46, 51, 116, 111, 55, 109, 101, 116, 114, 105, 99, 116, 111, 110, 115, 40, 53, 46, 56, 116, 111, 55, 46, 55, 115, 104, 111, 114, 116, 116, 111, 110, 115, 41, 105, 110, 119, 101, 105, 103, 104, 116, 44, 91, 53, 93, 91, 54, 93, 116, 104, 101, 118, 97, 114, 105, 111, 117, 115, 115, 112, 101, 99, 105, 101, 115, 111, 102, 83, 116, 101, 103, 111, 115, 97, 117, 114, 117, 115, 119, 101, 114, 101, 100, 119, 97, 114, 102, 101, 100, 98, 121, 99, 111, 110, 116, 101, 109, 112, 111, 114, 97, 114, 105, 101, 115, 44, 116, 104, 101, 103, 105, 97, 110, 116, 115, 97, 117, 114, 111, 112, 111, 100, 115, 46, 83, 111, 109, 101, 102, 111, 114, 109, 111, 102, 97, 114, 109, 111, 114, 97, 112, 112, 101, 97, 114, 115, 116, 111, 104, 97, 118, 101, 98, 101, 101, 110, 110, 101, 99, 101, 115, 115, 97, 114, 121, 44, 97, 115, 83, 116, 101, 103, 111, 115, 97, 117, 114, 117, 115, 115, 112, 101, 99, 105, 101, 115, 99, 111, 101, 120, 105, 115, 116, 101, 100, 119, 105, 116, 104, 108, 97, 114, 103, 101, 112, 114, 101, 100, 97, 116, 111, 114, 121, 116, 104, 101, 114, 111, 112, 111, 100, 100, 105, 110, 111, 115, 97, 117, 114, 115, 44, 115, 117, 99, 104, 97, 115, 65, 108, 108, 111, 115, 97, 117, 114, 117, 115, 97, 110, 100, 67, 101, 114, 97, 116, 111, 115, 97, 117, 114, 117, 115, 46}
 
-func TestEncodeFromFile(t *testing.T) {
+func TestEncodeFromPngFile(t *testing.T) {
 
-	inFile, err := os.Open(rawInputFile)
+	inFile, err := os.Open(rawInputFilePng)
 	if err != nil {
-		log.Printf("Error opening file %s: %v", rawInputFile, err)
+		log.Printf("Error opening file %s: %v", rawInputFilePng, err)
 		t.FailNow()
 
 	}
@@ -38,20 +41,79 @@ func TestEncodeFromFile(t *testing.T) {
 		t.FailNow()
 
 	}
-	outFile, err := os.Create(encodedInputFile)
+	outFile, err := os.Create(encodedInputFilePng)
 	if err != nil {
-		log.Printf("Error creating file %s: %v", encodedInputFile, err)
+		log.Printf("Error creating file %s: %v", encodedInputFilePng, err)
 		t.FailNow()
 
 	}
 	w.WriteTo(outFile)
 	defer outFile.Close()
 }
 
-func TestDecodeFromFile(t *testing.T) {
-	inFile, err := os.Open(encodedInputFile)
+func TestEncodeFromJpgFile(t *testing.T) {
+
+	inFile, err := os.Open(rawInputFileJpg)
+	if err != nil {
+		log.Printf("Error opening file %s: %v", rawInputFileJpg, err)
+		t.FailNow()
+
+	}
+	defer inFile.Close()
+
+	reader := bufio.NewReader(inFile)
+	img, err := jpeg.Decode(reader)
+	if err != nil {
+		log.Printf("Error decoding. %v", err)
+		t.FailNow()
+	}
+	w := new(bytes.Buffer)
+	err = Encode(w, img, bitmessage) // Encode the message into the image file
+	if err != nil {
+		log.Printf("Error Encoding file %v", err)
+		t.FailNow()
+
+	}
+	outFile, err := os.Create(encodedInputFileJpg)
+	if err != nil {
+		log.Printf("Error creating file %s: %v", encodedInputFileJpg, err)
+		t.FailNow()
+
+	}
+	w.WriteTo(outFile)
+	defer outFile.Close()
+}
+
+func TestDecodeFromPngFile(t *testing.T) {
+	inFile, err := os.Open(encodedInputFilePng)
+	if err != nil {
+		log.Printf("Error opening file %s: %v", encodedInputFilePng, err)
+		t.FailNow()
+	}
+	defer inFile.Close()
+
+	reader := bufio.NewReader(inFile)
+	img, _, err := image.Decode(reader)
+	if err != nil {
+		log.Print("Error decoding file")
+		t.FailNow()
+	}
+
+	sizeOfMessage := GetMessageSizeFromImage(img)
+
+	msg := Decode(sizeOfMessage, img) // Read the message from the picture file
+
+	if !bytes.Equal(msg, bitmessage) {
+		log.Println(string(msg))
+		log.Print("messages dont match")
+		t.FailNow()
+	}
+}
+
+func TestDecodeFromJpgFile(t *testing.T) {
+	inFile, err := os.Open(encodedInputFileJpg)
 	if err != nil {
-		log.Printf("Error opening file %s: %v", encodedInputFile, err)
+		log.Printf("Error opening file %s: %v", encodedInputFileJpg, err)
 		t.FailNow()
 	}
 	defer inFile.Close()