File Parser for levels (#18)

Co-authored-by: Debucquoy Anthony (tonitch) <debucquoy.anthony@gmail.com>
Reviewed-on: #18
Reviewed-by: Mat_02 <diletomatteo@gmail.com>

app/src/main/java/school_project/Utils/Bitwise.java

@@ -0,0 +1,43 @@
+package school_project.Utils;
+
+import school_project.Vec2;
+
+public class Bitwise {
+
+    /**
+     * Check if the bit at pos is 1 or 0
+     * @param b byte to test
+     * @param pos position in b to check
+     * @return true if the bit at pos is 1 or false if it is 0
+     */
+    public static boolean IsBitSetAt(byte b, int pos){
+        pos = 7 - pos;
+        return (b & (1 << pos))!= 0;
+    }
+
+    /**
+     * Transform a byte (8 bit) to two Nible (4 bit) with a split in the middle
+     * Exemple:
+     * in = 01000101 (=69)
+     * out = { 00000100, 00000101 } (={4, 5})
+     *
+     * @param in the byte to split
+     * @return an arrya of 2 byte ret[0] = left part; ret[1] = right part
+     */
+    public static Vec2 ByteToNible(byte in){
+        Vec2 ret = new Vec2();
+        ret.x = (byte) (in >> 4);
+        ret.y = (byte) (in & 15); // apply the mask '00001111'
+        return ret;
+    }
+
+    /**
+     * Transform 2 byte into 1 with a left part ( 4 bits ) and a right part ( 4 bits)
+     * @param left first 4 bits
+     * @param right last 4 bits
+     * @return concatenated byte
+     */
+    public static byte NibbleToByte(byte left, byte right){
+        return (byte) ((left << 4) | right);
+    }
+}