Add check that operators have 6 arguments when using Matrix (#708)

* Fix bug when cm operator didn't have 6 arguments

* Add same if clause to tm operator

* Update ChunkParser.java

Author: LonelyMidoriya

wcag-validation/src/main/java/org/verapdf/gf/model/factory/chunks/ChunkParser.java

@@ -248,8 +248,12 @@ public void parseChunk(Operator rawOperator, List<COSBase> arguments) {
 				}
 				break;
 			case Operators.TM:
-				textMatrix = new Matrix(arguments);
-				textLineMatrix = textMatrix.clone();
+                if (arguments.size() == 6) {
+                    textMatrix = new Matrix(arguments);
+                    textLineMatrix = textMatrix.clone();
+                } else {
+                    LOGGER.log(Level.WARNING, "tm operator does not have 6 arguments");
+                }
 				break;
             case Operators.TR:
                 if (arguments.size() == 1 && arguments.get(0).getType().isNumber()) {
@@ -457,7 +461,11 @@ public void parseChunk(Operator rawOperator, List<COSBase> arguments) {
 				processS();
 				break;
 			case Operators.CM_CONCAT:
-				graphicsState.getCTM().concatenate(new Matrix(arguments));
+                if (arguments.size() == 6) {
+                    graphicsState.getCTM().concatenate(new Matrix(arguments));
+                } else {
+                    LOGGER.log(Level.WARNING, "cm operator does not have 6 arguments");
+                }
 				break;
 			case Operators.Q_GRESTORE:
 				if (!graphicsStateStack.isEmpty()) {