app/src/main/java/school_project/MapParser.java

@@ -1,16 +1,28 @@
 package school_project;
 
+import school_project.Utils.Bitwise;
+
 import java.io.*;
-import java.lang.reflect.Array;
 import java.util.Arrays;
 
 public class MapParser {
+
+    /**
+     * Parse the file and create a Map with its shape and pieces setup
+     * @param file file to parse
+     * @return Map Object parsed with file data
+     * @see "TODO: Add Specification when done"
+     */
     public static Map ParseMapFile(File file) throws IllegalArgumentException, IllegalAccessException, IOException {
-        System.out.println(file.getAbsolutePath());
+        Map ret;
+
+        // Get the file and check that this file exists and can be read
         FileInputStream fileStream = new FileInputStream(file);
         if(!file.isFile()) throw new IllegalArgumentException("The argument should be a file");
         if(!file.canRead()) throw new IllegalAccessException("This file can't be read");
 
+        // Read the file an array of byte, then look for the HEADER (SMS) and then the FOOTER (SME)
+        // Then Put everything that is in between in level_data[]
         byte[] bytes = fileStream.readAllBytes();
         int start_position = 0, end_position = 0;
         for (int i = 0; i < bytes.length; i++) {
@@ -26,32 +38,64 @@ public class MapParser {
                 break;
             }
         }
-
         byte[] level_data = Arrays.copyOfRange(bytes, start_position, end_position);
-        int width_map = level_data[0], height_map = level_data[1];
-        byte[] map_data = Arrays.copyOfRange(level_data, 2, 2 + width_map * height_map / 8 + (height_map * width_map % 8 != 0 ? 1 : 0));
-        byte piece_count = level_data[3 + width_map * height_map / 8 + (height_map * width_map % 8 != 0 ? 1 : 0)];
-        byte[] pieces_datas = Arrays.copyOfRange(level_data, 4 + width_map * height_map / 8 + (height_map * width_map % 8 != 0 ? 1 : 0), level_data.length-1);
+
+        // Get the 2 first byte as the map width and height
+        // Then get the map data. This map data is every bit of the byte that represent either a true if it is a 1 or false if it is a 0
+        int map_width = level_data[0], map_height = level_data[1];
+        byte[] map_data = Arrays.copyOfRange(level_data, 2, 2 + map_width * map_height / 8 + (map_height * map_width % 8 != 0 ? 1 : 0));
+        boolean[][] map_matrix = BuildMatrixFromBytes(map_width, map_height, map_data);
+        ret = new Map(map_matrix);
+
+        // Get the amount of pieces
+        // For each of these pieces, get the size of the piece on 1 octet, 4 byte are for width then 4 byte are for height
+        // the same method as the map is used to get the piece shape.
+        byte piece_count = level_data[3 + map_width * map_height / 8 + (map_height * map_width % 8 != 0 ? 1 : 0)];
+        byte[] pieces_data = Arrays.copyOfRange(level_data, 4 + map_width * map_height / 8 + (map_height * map_width % 8 != 0 ? 1 : 0), level_data.length-1);
         for (int piece_index = 0; piece_index < piece_count; piece_index++) {
-
-
-
+            byte[] _piece_size = Bitwise.ByteToNible(pieces_data[piece_index]);
+            byte _piece_width = _piece_size[0], _piece_height = _piece_size[1];
+            byte[] _piece_data = Arrays.copyOfRange(pieces_data, piece_index + 1, 1 + _piece_width * _piece_height / 8 + (_piece_height * _piece_width % 8 != 0 ? 1 : 0));
+            boolean[][] _piece_matrix = BuildMatrixFromBytes(_piece_width, _piece_height, _piece_data);
+            Piece _piece = new Piece(_piece_matrix);
+            ret.AddShape(_piece);
+            piece_index = piece_index + _piece_width * _piece_height / 8 + (_piece_height * _piece_width % 8 != 0 ? 1 : 0);
         }
+
+        // Close the file and return the generated map
         fileStream.close();
-        return new Map(); //TODO: Send the parsed map
+        return ret;
     }
 
-//    public static void SaveMapFile(File file){
-//    }
+    /**
+     * Build a boolean Matrix From a byte array
+     * Each Byte is composed of 8 bit, each bit is 1 or 0
+     *  if the bit is 0 then it's a false for this cell
+     *  else it's true for this cell
+     * @param matrix_width width of the matrix
+     * @param matrix_height height of the matrix
+     * @param matrix_data byte array of the data to export
+     * @return boolean Matrix of the data decompiled
+     */
+    private static boolean[][] BuildMatrixFromBytes(int matrix_width, int matrix_height, byte[] matrix_data){
+        boolean[][] ret = new boolean[matrix_height][matrix_width];
 
+        // Transforming the bit from matrix_data's byte into boolean array for better manipulation
+        boolean[] b_array = new boolean[matrix_height * matrix_width];
+        int index = 0;
+        for(byte b: matrix_data){
+            for (int i = 0; i < 8; i++) { // because 8 bit in a byte
+                b_array[index] = Bitwise.IsBitSetAt(b, i);
+                index++;
+            }
+        }
 
-    private static boolean[][] BuildMatrixFromBytes(int map_width, int map_height, byte[] map_data){
-        boolean[][] ret = new boolean[map_height][map_width];
-        //TODO tonitch: cursor 2
-
+        // Transforming b_array to a 2D matrix
+        for (int x = 0; x < matrix_height; x++) {
+            for (int y = 0; y < matrix_width; y++) {
+                ret[x][y] = b_array[y + x * 8];
+            }
+        }
+        return ret;
     }
-    public static void main(String[] args) throws IOException, IllegalAccessException {
-        ParseMapFile(new File("test.smap"));
-    }
-
 }

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

@@ -0,0 +1,30 @@
+package school_project.Utils;
+
+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 byte[] ByteToNible(byte in){
+        byte[] ret = new byte[2];
+        ret[0] = (byte) (in >> 4);
+        ret[1] = (byte) (in & 15); // apply the mask '00001111'
+        return ret;
+    }
+}