segfault variable creation c++ - c++

Question

So I'm having some troubles with a segfault right now.
The problem appears to be on line 122
file_stream.read(binaryData, fileSizeInt);
The message seems to be unable to create variable object.
I'm using the debugger on CLion, if this is of any help.
I'm fairly new to C++ so please bear with me on this. I've included my source code below, since I have no idea what will and wont be relevant.
#include <fstream>
#include <iostream>
#include <math.h>
using namespace std;
//string dataLocation = "/dev/rdisk2"; // Variable for the mounting point of the SD Card.
string dataLocation = "/Volumes/Untitled/data/smith_data_backup.dat"; // Test location
int sectorSize = 512;
int bytesRead = 0;
string outDir = "/Volumes/Untitled/data/readData/";
char data_stop[10] = "Data_Stop";
char* findHeader(char* inputData) {
int i = 1;
//look for the end of the header
while(true) {
//cout << data[i] << '\n';
if (inputData[i] == '}') {
// found the end of the header
cout << "found the end of the header" << '\n';
break;
}
if (i > 200) { // don't get into an infinite loop here
cout << "something went wrong here" << '\n';
break;
}
i++;
}
// copy the header to a new char array
char* header = new char[i+1];
memcpy(header, &inputData[0], (size_t) (i +1));
return header;
}
int main() {
ifstream file_stream;
file_stream.open(dataLocation);
for( int j = 0; j < 10; j++ ) {
char data[sectorSize]; // figure out a decent size for this.....
string date = "";
string time = "";
string site = "";
string intId = "";
string totalFiles = "";
string fileNo = "";
string fileSize = "";
try {
// read the data file... this will be fun
cout << "Reading the data file" << '\n';
file_stream.read(data, sectorSize);
bytesRead += sectorSize;
if (data[0] == '{') {
char *header = findHeader(data);
cout << header << '\n';
//loop over the header to find the date, time, site ID, Instrument ID, and expected file size.
int commasFound = 0;
for(int i = 1; header[i] != '}', i++;) {
// increment the number of commas that have been found
if (header[i] == ',') {
commasFound ++;
continue;
}
//check for the end f the header
if (header[i] == '}') {
break;
}
//for some reason the first one never gets added
if (i==2) {
date += header[1];
}
// append to appropriate strings based on the number of commas that have been passed in the header
if (commasFound == 0) {
date += header[i];
}
if (commasFound == 1 && time.length() < 6) {
time += header[i];
}
if (commasFound == 2) {
fileNo += header[i];
}
if (commasFound == 6) {
site += header[i];
}
if (commasFound == 8) {
intId += header[i];
}
if (commasFound == 16) {
fileSize += header[i];
}
if (commasFound == 17) {
totalFiles += header[i];
}
//paranoia of infinite loops
if (i > 150) {
break;
}
}
string formattedDate = "20" + date.substr(4,2) + date.substr(2,2) + date.substr(0,2);
cout << formattedDate << " " << time << " " << " " << site << " " << intId << " " << fileSize << " " << totalFiles<< " " << '\n';
// Read in the data size
int fileSizeInt = atoi(fileSize.c_str()) * atoi(fileSize.c_str());
char binaryData[fileSizeInt];
file_stream.read(binaryData, fileSizeInt);
bytesRead += fileSizeInt;
string dateDir = outDir + formattedDate.substr(0,4) + "/" + date.substr(2,2) + "/" + site + "/" + date.substr(0,2) + "/";
string fileName = dateDir + formattedDate + "_" + time + "_" + site + "_" + intId + "_Full_Data.dat";
//cout << fileName << '\n';
//create the directory with the date.
string mkdirCommand = "mkdir -p " + dateDir;
system(mkdirCommand.c_str());
cout << "size " << sizeof(binaryData) << '\n';
//write data to file
try {
cout << "Write the data file " << '\n';
cout << header << " " << strlen(header) << '\n';
ofstream outFile;
outFile.open(fileName.c_str());
outFile.write(header, strlen(header));
outFile.write(binaryData, sizeof(binaryData));
outFile.write(data_stop, sizeof(data_stop));
outFile.close();
} catch (ofstream::failure e ) {
cout << "Unable to write the file " << fileName << '\n';
}
//read till the start of the next sector
int nextSector = (int) ceil(((double) bytesRead)/512.0);
int startOfNextSector = nextSector * 512;
cout << startOfNextSector << '\n';
int bytesToRead = startOfNextSector - bytesRead;
char dump[bytesToRead];
file_stream.read(dump, bytesToRead);
bytesRead += bytesToRead;
// The first block may be empty, quick check to see if the first block needs to be skipped
} else if (j == 0 && data[0] != '{') {
cout << "Skipping the first block" << '\n';
continue;
} else {
//cout << "no start here....." << bytesRead << '\n';
}
}
catch (ifstream::failure& e) {
cout << "Error" << "\n";
break;
}
}
file_stream.close();
return 0;
}