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