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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/testapp.h>
#include <vespa/vespalib/util/crc.h>
#include <vector>
using namespace vespalib;
class Test : public TestApp
{
public:
int Main() override;
void testCorrectNess();
void testBenchmark(size_t bufSz, size_t numRep);
};
int
Test::Main()
{
TEST_INIT("crc_test");
testCorrectNess();
testBenchmark(1024, 1000*1000);
TEST_DONE();
}
void
Test::testCorrectNess()
{
const char *a[7] = { "", "a", "ab", "abc", "abcd", "abcde", "doc:crawler:http://www.ntnu.no/" };
uint32_t expected[7] = {0, 0xe8b7be43, 0x9e83486d, 0x352441c2, 0xed82cd11, 0x8587d865, 0x86287fc5};
for (size_t i(0); i < sizeof(a)/sizeof(a[0]); i++) {
uint32_t vespaCrc32 = crc_32_type::crc(a[i], strlen(a[i]));
EXPECT_EQUAL(vespaCrc32, expected[i]);
vespalib::crc_32_type calculator2;
calculator2.process_bytes(a[i], strlen(a[i]));
EXPECT_EQUAL(vespaCrc32, calculator2.checksum());
}
vespalib::crc_32_type calculator;
uint32_t accum_expected[7] = {0, 0xe8b7be43, 0x690e2297, 0x8d7284f9, 0x7ed0c389, 0x61bc2a26, 0x1816e339};
for (size_t i(0); i < sizeof(a)/sizeof(a[0]); i++) {
calculator.process_bytes(a[i], strlen(a[i]));
EXPECT_EQUAL(calculator.checksum(), accum_expected[i]);
}
}
void
Test::testBenchmark(size_t bufSz, size_t numRep)
{
std::vector<char> a(numRep+bufSz);
for(size_t i(0), m(a.size()); i < m; i++) {
a[i] = i&0xff;
}
uint32_t sum(0);
for (size_t i(0); i < (numRep); i++) {
//sum ^= crc_32_type::crc(&a[i], bufSz);
vespalib::crc_32_type calculator;
calculator.process_bytes(&a[i], bufSz);
sum ^=calculator.checksum();
}
printf("sum = %x\n", sum);
}
TEST_APPHOOK(Test)
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