24 lines
802 B
C++
24 lines
802 B
C++
#include "DataFixture.h"
|
|
|
|
namespace cpputils {
|
|
Data DataFixture::generate(size_t size, long long int seed) {
|
|
Data result(size);
|
|
long long int val = seed;
|
|
for(size_t i=0; i<size/sizeof(long long int); ++i) {
|
|
//MMIX linear congruential generator
|
|
val *= 6364136223846793005L;
|
|
val += 1442695040888963407;
|
|
reinterpret_cast<long long int*>(result.data())[i] = val;
|
|
}
|
|
uint64_t alreadyWritten = (size/sizeof(long long int))*sizeof(long long int);
|
|
val *= 6364136223846793005L;
|
|
val += 1442695040888963407;
|
|
char *remainingBytes = reinterpret_cast<char*>(&val);
|
|
//Fill remaining bytes
|
|
for(size_t i=0; i<size-alreadyWritten; ++i) {
|
|
reinterpret_cast<char*>(result.data())[alreadyWritten + i] = remainingBytes[i];
|
|
}
|
|
return result;
|
|
}
|
|
}
|