From 60b29ca3d886a3a81e36a10761e697980f71f695 Mon Sep 17 00:00:00 2001
From: Kacper Kruczek <neronim66@gmail.com>
Date: Sun, 1 Jul 2018 15:27:15 +0200
Subject: [PATCH] 03 mono
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

zeby ograniczyć ilość obliczeń
---
 03-rozwiazanie.js |  5 +++--
 crc.js            | 30 +++++++++++++++---------------
 polynomial.js     |  9 ++++++++-
 3 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/03-rozwiazanie.js b/03-rozwiazanie.js
index 26f800f..23fdf1a 100644
--- a/03-rozwiazanie.js
+++ b/03-rozwiazanie.js
@@ -1,6 +1,7 @@
 const crc = require("./crc.js");
-let message = process.argv[3];
-let flag = process.argv[2];
+const message = process.argv[3];
+const flag = process.argv[2];
+
 switch (flag) {
     case '-e':
         console.log(crc.encode(message).encoded);
diff --git a/crc.js b/crc.js
index d5f2180..75a90ce 100644
--- a/crc.js
+++ b/crc.js
@@ -1,9 +1,8 @@
-let Polynomial = require('./polynomial.js');
+const Polynomial = require('./polynomial.js');
 
-let L = new Polynomial.Class(2, new Array(16).fill(1));
-let X = new Polynomial.Class(2, [0, 1]);
-let X16 = new Polynomial.Class(2, [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]); //jako ze można to od razu wymnożyć
-let G = new Polynomial.Class(2, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1]); //jako ze można to od razu wymnożyć
+const L = new Polynomial.Class(2, new Array(16).fill(1));
+const X16 = new Polynomial.Class(2, [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]); //jako ze można to od razu wymnożyć
+const G = new Polynomial.Class(2, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1]); //jako ze można to od razu wymnożyć
 
 const to_bin = a => {
     var result = "";
@@ -17,7 +16,7 @@ const to_ascii = a => {
     a = a.join('');
     a = parseInt(a, 2);
     //nie znalazłem innego sposobu w js na osiągniecie tego efektu..
-    // if (a < 126) //ponieważ wieksze liczby nie należą do typowego Ascii
+    // if (a < 126) //ponieważ wieksze liczby nie należą do typowego Ascii//porzucone ze wzgledu na decode
     return String.fromCharCode(a);
     // else {
     //     return "0x" + a.toString(16);
@@ -26,6 +25,12 @@ const to_ascii = a => {
 
 
 }
+const mod8format = array => {
+    while (array.length % 8 != 0) {
+        array.push(0);
+    }
+    return array;
+}
 
 const fcs = m => {
     let bits = m.map(to_bin); //message in binary
@@ -35,7 +40,7 @@ const fcs = m => {
 
     fcs = Polynomial.add(fcs,
         Polynomial.multiply(
-            Polynomial.power(X, m.length * 8),
+            Polynomial.Mono(m.length * 8, 1, 2),
             L
         )
     )
@@ -45,19 +50,14 @@ const fcs = m => {
     return fcs.coefficients;
 }
 
-function mod8format(lst) {
-    while (lst.length % 8 != 0) {
-        lst.push(0);
-    }
-    return lst;
-}
 
-function check(m) {
+
+const check = m => {
 
     let bits = m.map(to_bin); //message in binary
     bits = bits.join('').split('').reverse(); //reverse binary decoded message
 
-    let fcs = Polynomial.power(X, bits.length);
+    let fcs = Polynomial.Mono(bits.length, 1, 2);
 
 
     let C = new Polynomial.Class(2, bits);
diff --git a/polynomial.js b/polynomial.js
index b7aef67..70626b6 100644
--- a/polynomial.js
+++ b/polynomial.js
@@ -170,4 +170,11 @@ function gcd(p1, p2) {
 }
 
 
-exports.gcd = gcd;
\ No newline at end of file
+exports.gcd = gcd;
+
+function Mono(n, c, mod) {
+    let coef = new Array(n).fill(0);
+    coef.push(c);
+    return new Polynomial(mod, coef);
+}
+exports.Mono = Mono;
\ No newline at end of file