md5sum/test/stream.cc

#include "md5.h"
#include "helper.h"
#include "gtest/gtest.h"

using md5::MD5;

TEST(md5sum, stream) {
    const auto test_data = build_test_data(256 * 256);

    MD5 md5;
    for (size_t size = 1; size <= 256; ++size) {
        auto expect = MD5::Hash(test_data.data(), size * 256);

        for (size_t times = 0; times < 256; ++times) {
            const auto offset = test_data.data() + times * size;
            md5.Update(offset, size); // update multiple times
        }
        EXPECT_EQ(md5.Final().Digest(), expect);
        md5.Reset(); // reset for next round

        for (size_t times = 0; times < 256; ++times) {
            const auto offset = test_data.data() + times * size;
            md5.Update(std::string_view {offset, size}); // update multiple times
        }
        EXPECT_EQ(md5.Final().Digest(), expect);
        md5.Reset(); // reset for next round
    }
}

TEST(md5sum, overflow) {
    const auto test_data = build_test_data(64 * 1024 * 1024); // 64 MiB

    MD5 md5;
    for (int num = 0; num < 65; ++num) { // 4 GiB + 64 MiB
        md5.Update(test_data);
    }
    md5.Update(test_data.c_str(), 343); // 343 Bytes

    EXPECT_EQ(md5.Final().Digest(), "9593e87ff33818d6f8fd563282dfcbce");
}