QuickHash Library C++ Interface

The following sample demonstrates how to use the CCRC16 class to calculate the CRC16 checksum for a file.

#include <fstream>
#include <iostream>
#include <QuickHash.h>

using namespace std;
using namespace QuickHash;

bool CalculateFileChecksum( const char* filename, char* checksumhex )
{
    fstream file( filename, ios::in | ios::binary );
    
    if( !file )
    {
        cout << "\nCould not open file: " << filename;
        return false;
    }
    
    const unsigned int BUFF_SIZE = 1024;
    unsigned char buff[ BUFF_SIZE ];
    
    //Instantiate a CCRC16 object
    
    CCRC16 hash;
    
    //Calculate the checksum by calling Update for each block of the file
    
    while( !file.eof() )
    {
        file.read( ( char* )buff, BUFF_SIZE );
        hash.Update( buff, file.gcount() );
    }
    
    //Do final changes and get the checksum in hex format
    
    hash.FinalHex( checksumhex ); // FinalHex reinitializes the hash object for the next use
    
    file.close();
    
    return true;
}

int main()
{
    char buff[ 10 ];
    
    char checksumhex[ CCRC16::HEXDIGESTSIZE ]; //0 terminated
    
    do
    {
        //Get the file name from the user
        
	cout << "\nEnter a file name:\n";
        
        char filename[ 256 ];
        cin.getline( filename, 256 );
        
        //Calculate the checksum
        
        if( CalculateFileChecksum( filename, checksumhex ) )
            cout << "\nChecksum: " << checksumhex;
        
        //Continue?
        
        cout << "\nContinue (Y/N)?";
        cin.getline( buff, 10 );
        
    } while ( *buff == 'y' || *buff == 'Y' );
    
    return 0;
}

 


 

 

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