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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. using byte = unsigned char;
  5.  
  6. std::vector<uint16_t> GetIntArrayFromByteArray(const std::vector<byte>& byteArray)
  7. {
  8.     const int inputSize = byteArray.size();
  9.     const bool inputIsOddCount = inputSize % 2 != 0;
  10.     const int finalSize = (int)(inputSize/2.0 + 0.5);
  11.     // Ignore the last odd item in loop and handle it later
  12.     const int loopLength = inputIsOddCount ? inputSize - 1 : inputSize;
  13.  
  14.     std::vector<uint16_t> intArray;
  15.     // Reserve space for all items
  16.     intArray.reserve(finalSize);
  17.     for (int i = 0; i < loopLength; i += 2) 
  18.     {
  19.       intArray.push_back((uint16_t)((byteArray[i] << 8) | byteArray[i + 1]));
  20.     }
  21.  
  22.     // If the input was odd-count, we still have one byte to add, along with a zero
  23.     if(inputIsOddCount) 
  24.     {
  25.       // The zero in this expression is redundant but illustrative
  26.       intArray.push_back((uint16_t)((byteArray[inputSize-1] << 8) | 0));
  27.     }
  28.     return intArray;
  29. }
  30.  
  31. int main() {
  32. 	const std::vector<byte> numbers{2,0,0,0,1,0,0,1,4};
  33. 	const std::vector<uint16_t> result(GetIntArrayFromByteArray(numbers));
  34.  
  35. 	for(uint16_t num: result) {
  36. 		std::cout << num << "\n";
  37. 	}
  38.  
  39. 	return 0;
  40. }
  41.  
  42.  
Success #stdin #stdout 0s 4376KB
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https://ideone.com/sTZH4B
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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