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#include <iostream>
#include <fstream>
#include <string>
void joinFile(char *chunkName, char *fileOutput);
void chunkFile(std::string, std::string, unsigned long);
int getFileSize(std::ifstream);
int main(){
std::string answer;
std::cout << "do you need to chunk or join?" << std::endl;
std::cin >> answer;
if (answer == "chunk"){
std::cout << "what's the name of the file" << std::endl;
std::string name; std::cin >> name;
std::cout << "what is the size (bytes) you want it to be chunked in?" << std::endl;
unsigned long size;std::cin >> size;
chunkFile(name, "nsugh", size);
}
else if( answer == "join") {
std::cout << "what's the name of the list of files" << std::endl;
std::string name; std::cin >> name;
std::cout << "sorry this is still under construction " << std::endl;
}
else {
std::cout << "please type a valid response.";
}
}
// Chunks a file by breaking it up into chunks of "chunkSize" bytes.
void chunkFile(std::string fullFilePath, std::string chunkName, unsigned long chunkSize) {
using namespace std;
ifstream fileStream;
fileStream.open(fullFilePath, ios::in | ios::binary);
// File open a success
if (fileStream.is_open()) {
ofstream output;
int counter = 1;
string fullChunkName;
// Create a buffer to hold each chunk
char *buffer = new char[chunkSize];
// Keep reading until end of file
while (!fileStream.eof()) {
// Build the chunk file name. Usually drive:\\chunkName.ext.N
// N represents the Nth chunk
fullChunkName.clear();
fullChunkName.append(chunkName);
fullChunkName.append(".");
// Convert counter integer into string and append to name.
char intBuf[10];
itoa(counter,intBuf,10);
fullChunkName.append(intBuf);
// Open new chunk file name for output
output.open(fullChunkName.c_str(),ios::out | ios::trunc | ios::binary);
// If chunk file opened successfully, read from input and
// write to output chunk. Then close.
if (output.is_open()) {
fileStream.read(buffer,chunkSize);
// gcount() returns number of bytes read from stream.
output.write(buffer,fileStream.gcount());
output.close();
counter++;
}
}
// Cleanup buffer
delete(buffer);
// Close input file stream.
fileStream.close();
cout << "Chunking complete! " << counter - 1 << " files created." << endl;
}
else { cout << "Error opening file!" << endl; }
}
// Finds chunks by "chunkName" and creates file specified in fileOutput
void joinFile(std::string chunkName, std::string fileOutput) {
using namespace std;
string fileName;
// Create our output file
ofstream outputfile;
outputfile.open(fileOutput, ios::out | ios::binary);
// If successful, loop through chunks matching chunkName
if (outputfile.is_open()) {
bool filefound = true;
int counter = 1;
int fileSize = 0;
while (filefound) {
filefound = false;
// Build the filename
fileName.clear();
fileName.append(chunkName);
fileName.append(".");
char intBuf[10];
_itoa(counter,intBuf,10);
fileName.append(intBuf);
// Open chunk to read
ifstream fileInput;
fileInput.open(fileName.c_str(), ios::in | ios::binary);
// If chunk opened successfully, read it and write it to
// output file.
if (fileInput.is_open()) {
filefound = true;
fileSize = getFileSize(&fileInput);
char *inputBuffer = new char[fileSize];
fileInput.read(inputBuffer,fileSize);
outputfile.write(inputBuffer,fileSize);
delete(inputBuffer);
fileInput.close();
}
counter++;
}
// Close output file.
outputfile.close();
cout << "File assembly complete!" << endl;
}
else { cout << "Error: Unable to open file for output." << endl; }
}
// Simply gets the file size of file.
int getFileSize(std::ifstream *file) {
file->seekg(0,std::ios::end);
int filesize = file->tellg();
file->seekg(std::ios::beg);
return filesize;
}
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