feat: improve Bufffer API

src/me/topchetoeu/jscript/filesystem/Buffer.java

@@ -24,6 +24,10 @@ public class Buffer {
         return n;
     }
 
+    public void append(byte b) {
+        write(length, new byte[] { b });
+    }
+
     public byte[] data() {
         var res = new byte[length];
         System.arraycopy(this.data, 0, res, 0, length);
@@ -38,4 +42,12 @@ public class Buffer {
         this.length = data.length;
         System.arraycopy(data, 0, this.data, 0, data.length);
     }
+    public Buffer(int capacity) {
+        this.data = new byte[capacity];
+        this.length = 0;
+    }
+    public Buffer() {
+        this.data = new byte[128];
+        this.length = 0;
+    }
 }

src/me/topchetoeu/jscript/filesystem/File.java

@@ -21,7 +21,7 @@ public interface File {
         return new String(res);
     }
     default String readLine() {
-        var res = new Buffer(new byte[0]);
+        var res = new Buffer();
         var buff = new byte[1];
 
         while (true) {

src/me/topchetoeu/jscript/filesystem/MemoryFilesystem.java

@@ -24,7 +24,7 @@ public class MemoryFilesystem implements Filesystem {
                 if (!folders.contains(_path.getParent())) throw new FilesystemException(path, FSCode.DOESNT_EXIST);
                 if (folders.contains(_path) || files.containsKey(_path)) throw new FilesystemException(path, FSCode.ALREADY_EXISTS);
                 if (folders.contains(_path)) throw new FilesystemException(path, FSCode.ALREADY_EXISTS);
-                files.put(_path, new Buffer(new byte[0]));
+                files.put(_path, new Buffer());
                 break;
             case FOLDER:
                 if (!folders.contains(_path.getParent())) throw new FilesystemException(path, FSCode.DOESNT_EXIST);