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  1. #include <iostream>
  2. #include <fstream>
  3. #include <cstring>
  4. #include <string>
  5.  
  6. int str2num(const char* str) {
  7.     int num = 0;
  8.     for (int i = 0; str[i] != '\0'; ++i) {
  9.         num = num * 10 + str[i] - '0';
  10.     }
  11.     return num;
  12. }
  13.  
  14. std::string num2str(int num) {
  15.     std::string str;
  16.     if (num == 0) {
  17.         str = "0";
  18.     } else {
  19.         while (num > 0) {
  20.             str += num % 10 + '0';
  21.             num /= 10;
  22.         }
  23.     }
  24.     while (str.size() < 2) {
  25.         str += '0';
  26.     }
  27.     for (int i = 0; i < (int)str.size()/2; ++i) {
  28.         std::swap(str[i], str[(int)str.size()-1-i]);
  29.     }
  30.     return str;
  31. }
  32.  
  33. void getFileName(const std::string& path, std::string& fileName) {
  34.     int pos = (int)path.size() - 1;
  35.     for (; pos >= 0; --pos) {
  36.         if (path[pos] == '/') {
  37.             break;
  38.         }
  39.     }
  40.     fileName = path.substr(pos+1);
  41. }
  42.  
  43. void formatDirPath(std::string& dirPath) {
  44.     if (!dirPath.empty() || dirPath.back() != '/') {
  45.         dirPath += '/';
  46.     }
  47. }
  48.  
  49. int getFileSize(std::ifstream& fin) {
  50.     fin.seekg(0, fin.end);
  51.     int fileSize = fin.tellg();
  52.     fin.seekg(0);
  53.     return fileSize;
  54. }
  55.  
  56. void readBinFile(const std::string& path, int& bufferSize, char*& buffer) {
  57.     std::ifstream fin(path, std::ios::binary);
  58.     if (!fin.is_open()) {
  59.         std::cout << "Cannot open " << path << '\n';
  60.         return;
  61.     }
  62.     bufferSize = getFileSize(fin);
  63.     buffer = new char[bufferSize];
  64.     fin.read(buffer, bufferSize);
  65.     fin.close();
  66. }
  67.  
  68. void writeBinFile(const std::string& path, int bufferSize, int start, int maxchar, char* buffer) {
  69.     std::ofstream fout(path, std::ios::binary);
  70.     if (!fout.is_open()) {
  71.         std::cout << "Cannot open " << path << '\n';
  72.         return;
  73.     }
  74.     fout.write(buffer+start, std::min(maxchar, bufferSize - start));
  75.     fout.close();
  76. }
  77.  
  78. int main(int argc, char** argv) {
  79.     std::string filePath;
  80.     std::string outDir;
  81.     int numPart = -1;
  82.     int sizePart = -1; 
  83.  
  84.     const int numArg = 7;
  85.     if (argc != numArg) {
  86.         std::cout << "Invalid arguments\n";
  87.         return 0;
  88.     } else {
  89.         for (int i = 1; i < numArg; i+=2) {
  90.             if (strcmp(argv[i], "-s") == 0) {
  91.                 filePath = argv[i+1];
  92.             } else if (strcmp(argv[i], "-d") == 0) {
  93.                 outDir = argv[i+1];
  94.             } else if (strcmp(argv[i], "-numpart") == 0) {
  95.                 numPart = str2num(argv[i+1]);
  96.             } else if (strcmp(argv[i], "-sizeapart") == 0) {
  97.                 sizePart = str2num(argv[i+1]);
  98.             }
  99.         }
  100.         if (filePath.empty()) {
  101.             std::cout << "Source file not found in arguments!\n";
  102.             return 0;
  103.         } 
  104.         if (outDir.empty()) {
  105.             std::cout << "Destination not found in arguments!\n";
  106.             return 0;
  107.         }
  108.         if (numPart == -1 && sizePart == -1) {
  109.             std::cout << "numpart and sizeapart not found in arguments!\n";
  110.             return 0;
  111.         }
  112.     }
  113.  
  114.     std::ifstream fin(filePath, std::ios::binary);
  115.     if (!fin.is_open()) {
  116.         std::cout << "Cannot open " << filePath << '\n';
  117.         return 0;
  118.     }
  119.     if (numPart == -1) {
  120.         numPart = (getFileSize(fin) + sizePart - 1) / sizePart;
  121.     } else {
  122.         sizePart = (getFileSize(fin) + numPart - 1) / numPart;
  123.     }
  124.     fin.close();
  125.  
  126.     std::string fileName;
  127.     getFileName(filePath, fileName);
  128.  
  129.     formatDirPath(outDir);
  130.  
  131.     int bufferSize;
  132.     char* buffer = nullptr;
  133.     readBinFile(filePath, bufferSize, buffer);
  134.  
  135.     for (int i = 1; i <= numPart; ++i) {
  136.         std::string outPath = outDir + fileName + ".part" + num2str(i);
  137.         writeBinFile(outPath, bufferSize, sizePart * (i-1), sizePart, buffer);
  138.     }
  139.  
  140.     delete[] buffer;
  141.  
  142.     return 0;
  143. }
Success #stdin #stdout 0.01s 5548KB
comments (?)
stdin 
Standard input is empty
stdout 
Invalid arguments
https://ideone.com/qT6NOb
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
secret

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