/commoncpp2-1.8.1/tests/ccxx_tests.cpp

#include <cppunit/extensions/TestFactoryRegistry.h>
#include <cppunit/CompilerOutputter.h>
#include <cppunit/ui/text/TestRunner.h>
#include <string>
#include <iomanip>

//#include "SHATumblerTest.h"

//CPPUNIT_TEST_SUITE_REGISTRATION(SHATumblerTest);

using namespace std;

#define ULONG unsigned long

ULONG crc32_table[256]; // Lookup table array

// Reflection is a requirement for the official CRC-32 standard.
// You can create CRCs without it, but they won't conform to the standard.
ULONG Reflect(ULONG ref, char ch)
{// Used only by Init_CRC32_Table()

	ULONG value(0);

	// Swap bit 0 for bit 7
	// bit 1 for bit 6, etc.
	for(int i = 1; i < (ch + 1); i++) {
		if(ref & 1)
			value |= 1 << (ch - i);
		ref >>= 1;
	}
	return value;
}

// Call this function only once to initialize the CRC table.
void Init_CRC32_Table()
{// Called by OnInitDialog()

	// This is the official polynomial used by CRC-32
	// in PKZip, WinZip and Ethernet.
	ULONG ulPolynomial = 0x04c11db7;

	// 256 values representing ASCII character codes.
	for(int i = 0; i <= 0xFF; i++) {
		crc32_table[i]=Reflect(i, 8) << 24;
		for (int j = 0; j < 8; j++)
			crc32_table[i] = (crc32_table[i] << 1) ^ (crc32_table[i] & (1 << 31) ? ulPolynomial : 0);
		crc32_table[i] = Reflect(crc32_table[i], 32);
	//cout << i << ":" << crc32_table[i] << endl;
	}
}

// Once the lookup table has been filled in by the two functions above,
// this function creates all CRCs using only the lookup table.
int Get_CRC(string &text)
{// Called by OnChangeText()

	// Be sure to use unsigned variables,
	// because negative values introduce high bits
	// where zero bits are required.

	// Start out with all bits set high.
	ULONG  ulCRC(0xffffffff);
	int len;
	unsigned char* buffer;

	// Get the length.
	// Note that if the text contains NULL characters
	// processing ends at the first NULL and the CRC value is invalid.
	// See the 32 Bit File Demonstration source code
	// for a method of dealing with NULL characters in files.
	len = text.length();
	// Save the text in the buffer.
	buffer = (unsigned char*)text.c_str();
	// Perform the algorithm on each character
	// in the string, using the lookup table values.
	while(len--)
		ulCRC = (ulCRC >> 8) ^ crc32_table[(ulCRC & 0xFF) ^ *buffer++];
	// Exclusive OR the result with the beginning value.
	return ulCRC ^ 0xffffffff;
}

int main(int argc, char * argv[])
{
  // if command line contains "-selftest" then this is the post build check
  // => the output must be in the compiler error format.
  bool selfTest = (argc > 1)  && (std::string("-selftest") == argv[1]);

  // new
  CppUnit::TestFactoryRegistry &registry = CppUnit::TestFactoryRegistry::getRegistry();
  CppUnit::TextUi::TestRunner runner;
  runner.addTest(registry.makeTest());

  if(selfTest)
  { // Change the default outputter to a compiler error format outputter
	// The test runner owns the new outputter.
	runner.setOutputter(
	  CppUnit::CompilerOutputter::defaultOutputter(&runner.result(), std::cerr)
	);
  }

  bool wasSucessful = runner.run("", false);

  //Init_CRC32_Table();
  //cout << hex << setw(8) << Get_CRC(string("pippo"));

  return !wasSucessful; // inverted as 0 is success 1 is failure
}