using now own shred impl with check if the complete drive is full of zeros after shredding

include/shred.h

@@ -0,0 +1,54 @@
+/**
+ * @file    shred.h
+ * @brief   shred drive
+ * @author  hendrik schutter
+ * @date    03.05.2020
+ */
+
+#ifndef SHRED_H_
+#define SHRED_H_
+
+#include "reHDD.h"
+
+#include <iostream>
+#include <fstream>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+
+#define CHUNK_SIZE 1024*1024*2 //amount of bytes that are overwritten at once
+#define SHRED_ITERATIONS 3 //overwrite the drive multiple times, last time with zeros
+
+//#define DEMO_DRIVE_SIZE 1024*1024*256 // 256MB
+
+typedef int fileDescriptor;
+
+class Shred
+{
+protected:
+
+public:
+
+    Shred();
+    ~Shred();
+    int shredDrive(Drive* drive, int* ipSignalFd);
+
+private:
+    fileDescriptor randomSrcFileDiscr;
+    fileDescriptor driveFileDiscr;
+    unsigned char caChunk[CHUNK_SIZE];
+    unsigned long ulDriveByteSize;
+    double d32Percent = 0.0;
+    double d32TmpPercent = 0.0;
+
+    inline double calcProgress(unsigned long ulDriveByteIndex, unsigned int uiIteration);
+    int iRewindDrive(fileDescriptor file);
+    unsigned long getDriveSizeInBytes(fileDescriptor file);
+    unsigned int uiCalcChecksum(fileDescriptor file);
+    void cleanup();
+
+};
+
+#endif  // SHRED_H_