mirror of
https://github.com/flutter/flutter.git
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203 lines
6.8 KiB
C++
203 lines
6.8 KiB
C++
/*
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* Copyright (C) 2012 Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <gtest/gtest.h>
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#include "flutter/sky/engine/wtf/MathExtras.h"
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namespace {
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TEST(MathExtrasTest, Lrint)
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{
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EXPECT_EQ(-8, lrint(-7.5));
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EXPECT_EQ(-8, lrint(-8.5));
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EXPECT_EQ(0, lrint(-0.5));
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EXPECT_EQ(0, lrint(0.5));
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EXPECT_EQ(0, lrint(-0.5));
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EXPECT_EQ(1, lrint(1.3));
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EXPECT_EQ(2, lrint(1.7));
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EXPECT_EQ(0, lrint(0));
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EXPECT_EQ(0, lrint(-0));
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if (sizeof(long int) == 8) {
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// Largest double number with 0.5 precision and one halfway rounding case below.
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EXPECT_EQ(pow(2.0, 52), lrint(pow(2.0, 52) - 0.5));
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EXPECT_EQ(pow(2.0, 52) - 2, lrint(pow(2.0, 52) - 1.5));
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// Smallest double number with 0.5 precision and one halfway rounding case above.
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EXPECT_EQ(-pow(2.0, 52), lrint(-pow(2.0, 52) + 0.5));
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EXPECT_EQ(-pow(2.0, 52) + 2, lrint(-pow(2.0, 52) + 1.5));
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}
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}
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TEST(MathExtrasTest, clampToIntLong)
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{
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if (sizeof(long) == sizeof(int))
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return;
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long maxInt = std::numeric_limits<int>::max();
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long minInt = std::numeric_limits<int>::min();
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long overflowInt = maxInt + 1;
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long underflowInt = minInt - 1;
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EXPECT_GT(overflowInt, maxInt);
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EXPECT_LT(underflowInt, minInt);
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EXPECT_EQ(maxInt, clampTo<int>(maxInt));
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EXPECT_EQ(minInt, clampTo<int>(minInt));
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EXPECT_EQ(maxInt, clampTo<int>(overflowInt));
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EXPECT_EQ(minInt, clampTo<int>(underflowInt));
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}
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TEST(MathExtrasTest, clampToIntLongLong)
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{
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long long maxInt = std::numeric_limits<int>::max();
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long long minInt = std::numeric_limits<int>::min();
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long long overflowInt = maxInt + 1;
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long long underflowInt = minInt - 1;
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EXPECT_GT(overflowInt, maxInt);
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EXPECT_LT(underflowInt, minInt);
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EXPECT_EQ(maxInt, clampTo<int>(maxInt));
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EXPECT_EQ(minInt, clampTo<int>(minInt));
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EXPECT_EQ(maxInt, clampTo<int>(overflowInt));
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EXPECT_EQ(minInt, clampTo<int>(underflowInt));
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}
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TEST(MathExtrasTest, clampToIntegerFloat)
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{
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// This test is inaccurate as floats will round the min / max integer
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// due to the narrow mantissa. However it will properly checks within
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// (close to the extreme) and outside the integer range.
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float maxInt = std::numeric_limits<int>::max();
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float minInt = std::numeric_limits<int>::min();
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float overflowInt = maxInt * 1.1;
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float underflowInt = minInt * 1.1;
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EXPECT_GT(overflowInt, maxInt);
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EXPECT_LT(underflowInt, minInt);
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// If maxInt == 2^31 - 1 (ie on I32 architecture), the closest float used to represent it is 2^31.
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EXPECT_NEAR(clampToInteger(maxInt), maxInt, 1);
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EXPECT_EQ(minInt, clampToInteger(minInt));
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EXPECT_NEAR(clampToInteger(overflowInt), maxInt, 1);
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EXPECT_EQ(minInt, clampToInteger(underflowInt));
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}
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TEST(MathExtrasTest, clampToIntegerDouble)
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{
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double maxInt = std::numeric_limits<int>::max();
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double minInt = std::numeric_limits<int>::min();
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double overflowInt = maxInt + 1;
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double underflowInt = minInt - 1;
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EXPECT_GT(overflowInt, maxInt);
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EXPECT_LT(underflowInt, minInt);
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EXPECT_EQ(maxInt, clampToInteger(maxInt));
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EXPECT_EQ(minInt, clampToInteger(minInt));
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EXPECT_EQ(clampToInteger(overflowInt), maxInt);
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EXPECT_EQ(clampToInteger(underflowInt), minInt);
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}
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TEST(MathExtrasTest, clampToFloat)
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{
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double maxFloat = std::numeric_limits<float>::max();
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double minFloat = -maxFloat;
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double overflowFloat = maxFloat * 1.1;
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double underflowFloat = minFloat * 1.1;
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EXPECT_GT(overflowFloat, maxFloat);
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EXPECT_LT(underflowFloat, minFloat);
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EXPECT_EQ(maxFloat, clampToFloat(maxFloat));
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EXPECT_EQ(minFloat, clampToFloat(minFloat));
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EXPECT_EQ(maxFloat, clampToFloat(overflowFloat));
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EXPECT_EQ(minFloat, clampToFloat(underflowFloat));
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EXPECT_EQ(maxFloat, clampToFloat(std::numeric_limits<float>::infinity()));
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EXPECT_EQ(minFloat, clampToFloat(-std::numeric_limits<float>::infinity()));
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}
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TEST(MathExtrasTest, clampToUnsignedLong)
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{
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if (sizeof(unsigned long) == sizeof(unsigned))
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return;
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unsigned long maxUnsigned = std::numeric_limits<unsigned>::max();
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unsigned long overflowUnsigned = maxUnsigned + 1;
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EXPECT_GT(overflowUnsigned, maxUnsigned);
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EXPECT_EQ(maxUnsigned, clampTo<unsigned>(maxUnsigned));
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EXPECT_EQ(maxUnsigned, clampTo<unsigned>(overflowUnsigned));
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EXPECT_EQ(0u, clampTo<unsigned>(-1));
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}
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TEST(MathExtrasTest, clampToUnsignedLongLong)
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{
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unsigned long long maxUnsigned = std::numeric_limits<unsigned>::max();
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unsigned long long overflowUnsigned = maxUnsigned + 1;
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EXPECT_GT(overflowUnsigned, maxUnsigned);
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EXPECT_EQ(maxUnsigned, clampTo<unsigned>(maxUnsigned));
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EXPECT_EQ(maxUnsigned, clampTo<unsigned>(overflowUnsigned));
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EXPECT_EQ(0u, clampTo<unsigned>(-1));
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}
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// Make sure that various +-inf cases are handled properly (they aren't
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// by default on VS).
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TEST(MathExtrasTest, infinityMath)
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{
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double posInf = std::numeric_limits<double>::infinity();
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double negInf = -std::numeric_limits<double>::infinity();
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double nan = std::numeric_limits<double>::quiet_NaN();
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EXPECT_EQ(M_PI_4, atan2(posInf, posInf));
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EXPECT_EQ(3.0 * M_PI_4, atan2(posInf, negInf));
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EXPECT_EQ(-M_PI_4, atan2(negInf, posInf));
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EXPECT_EQ(-3.0 * M_PI_4, atan2(negInf, negInf));
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EXPECT_EQ(0.0, fmod(0.0, posInf));
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EXPECT_EQ(7.0, fmod(7.0, posInf));
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EXPECT_EQ(-7.0, fmod(-7.0, posInf));
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EXPECT_EQ(0.0, fmod(0.0, negInf));
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EXPECT_EQ(7.0, fmod(7.0, negInf));
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EXPECT_EQ(-7.0, fmod(-7.0, negInf));
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EXPECT_EQ(1.0, pow(5.0, 0.0));
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EXPECT_EQ(1.0, pow(-5.0, 0.0));
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EXPECT_EQ(1.0, pow(nan, 0.0));
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}
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} // namespace
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