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8345475bc3
Avoid custom overflow code; simply use 128-bit math to maintain precision and return a saturated 64-bit value as the final result. Disallow use of negative values in the `fee_mult_max` and `fee_div_max` fields. This change could potentially cause submissions with negative values that would have previously succeeded to now fail.
63 lines
2.4 KiB
C++
63 lines
2.4 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012-2016 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#include <BeastConfig.h>
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#include <ripple/basics/mulDiv.h>
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#include <ripple/beast/unit_test.h>
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namespace ripple {
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namespace test {
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struct mulDiv_test : beast::unit_test::suite
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{
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void run()
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{
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const auto max = std::numeric_limits<std::uint64_t>::max();
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const std::uint64_t max32 = std::numeric_limits<std::uint32_t>::max();
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auto result = mulDiv(85, 20, 5);
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BEAST_EXPECT(result.first && result.second == 340);
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result = mulDiv(20, 85, 5);
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BEAST_EXPECT(result.first && result.second == 340);
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result = mulDiv(0, max - 1, max - 3);
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BEAST_EXPECT(result.first && result.second == 0);
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result = mulDiv(max - 1, 0, max - 3);
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BEAST_EXPECT(result.first && result.second == 0);
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result = mulDiv(max, 2, max / 2);
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BEAST_EXPECT(result.first && result.second == 4);
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result = mulDiv(max, 1000, max / 1000);
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BEAST_EXPECT(result.first && result.second == 1000000);
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result = mulDiv(max, 1000, max / 1001);
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BEAST_EXPECT(result.first && result.second == 1001000);
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result = mulDiv(max32 + 1, max32 + 1, 5);
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BEAST_EXPECT(result.first && result.second == 3689348814741910323);
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// Overflow
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result = mulDiv(max - 1, max - 2, 5);
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BEAST_EXPECT(!result.first && result.second == max);
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}
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};
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BEAST_DEFINE_TESTSUITE(mulDiv, ripple_basics, ripple);
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} // namespace test
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} // namespace ripple
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