From a82f77cd33275262684a8beda8d3e12c6950d9be Mon Sep 17 00:00:00 2001
From: Stefan Suhren <suhren.stefan@fh-swf.de>
Date: Wed, 1 Apr 2015 17:01:57 +0200
Subject: First steps with CryptClassCaesar

---
 src/crypt/cryptclasscaesar.cpp | 36 +++++++++++++++++++++++++++++++++++-
 src/crypt/cryptclasscaesar.h   | 10 ++++++++++
 2 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/src/crypt/cryptclasscaesar.cpp b/src/crypt/cryptclasscaesar.cpp
index 23914a2..c1094ef 100644
--- a/src/crypt/cryptclasscaesar.cpp
+++ b/src/crypt/cryptclasscaesar.cpp
@@ -1,8 +1,12 @@
 #include "cryptclasscaesar.h"
 
+const int CryptClassCaesar::lowerBound = 0x30;
+const int CryptClassCaesar::upperBound = 0x7A;
+
 CryptClassCaesar::CryptClassCaesar()
 {
-
+    oldKey = -1;
+    buildMap();
 }
 
 CryptClassCaesar::~CryptClassCaesar()
@@ -13,9 +17,39 @@ CryptClassCaesar::~CryptClassCaesar()
 void CryptClassCaesar::encrypt()
 {
     qDebug("CryptClassCaesar::encrypt");
+    buildMap();
+
+    QByteArray tmp = getClearText();
+
+    for (int i = 0; i < tmp.size(); i++)
+    {
+        tmp[i] = substitutionsMap[tmp[i]];
+    }
+
+    setCryptText((unsigned char*) tmp.data(), tmp.size());
+
 }
 
 void CryptClassCaesar::decrypt()
 {
     qDebug("CryptClassCaesar::encrypt");
 }
+
+void CryptClassCaesar::buildMap()
+{
+    if (oldKey == getKey().toInt())
+    {
+        return;
+    }
+
+    oldKey = getKey().toInt();
+
+    substitutionsMap.clear();
+
+    for (int i = 0; i < (upperBound - lowerBound); i++)
+    {
+        substitutionsMap.insert((char)(lowerBound + i),
+                                (char)(lowerBound + (i + oldKey) % (upperBound - lowerBound)));
+
+    }
+}
diff --git a/src/crypt/cryptclasscaesar.h b/src/crypt/cryptclasscaesar.h
index 6262d9e..d419232 100644
--- a/src/crypt/cryptclasscaesar.h
+++ b/src/crypt/cryptclasscaesar.h
@@ -3,6 +3,7 @@
 
 #include "cryptclassbase.h"
 #include <QMap>
+#include <QDebug>
 
 class CryptClassCaesar : public CryptClassBase
 {
@@ -14,6 +15,15 @@ public:
 public:
     void encrypt();
     void decrypt();
+
+private:
+    void buildMap();
+
+    int oldKey;
+    QMap<char, char> substitutionsMap;
+
+    const static int lowerBound;
+    const static int upperBound;
 };
 
 #endif // CRYPTCLASSCAESAR_H
-- 
cgit v1.2.3-70-g09d2