added code for mp3 and jpeg parsing

added interface for data sources

data/formats/jpeg/test.cpp

@@ -0,0 +1,24 @@
+#include "JPEGDEC.h"
+#include <iostream>
+#include "testimage.h"
+
+// gcc -D__LINUX__ jpeg.c JPEGDEC.cpp test.cpp
+
+int drawJPEG(JPEGDRAW* pDraw) {
+	return 1;
+}
+
+int main(void) {
+	
+	JPEGDEC jpeg;
+	int res = jpeg.openRAM(aaa_jpg, aaa_jpg_len, drawJPEG);
+	
+	std::cout << res << std::endl;
+	
+	if (res) {
+		jpeg.setPixelType(RGB565_BIG_ENDIAN);
+		jpeg.decode(0, 0, 0);//40, 100, JPEG_SCALE_QUARTER | JPEG_EXIF_THUMBNAIL);
+		jpeg.close();
+	}
+	
+}