tools/qa/cppunit/test_bigint.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <cppunit/TestFixture.h>
  21 #include <cppunit/extensions/HelperMacros.h>
  22
  23 #include <tools/bigint.hxx>
  24
  25 #include <limits>
  26
  27 namespace tools
  28 {
  29 class BigIntTest : public CppUnit::TestFixture
  30 {
  31 public:
  32     void testConstructionFromLongLong();
  33     void testLenB1();
  34
  35     CPPUNIT_TEST_SUITE(BigIntTest);
  36     CPPUNIT_TEST(testConstructionFromLongLong);
  37     CPPUNIT_TEST(testLenB1);
  38     CPPUNIT_TEST_SUITE_END();
  39 };
  40
  41 void BigIntTest::testConstructionFromLongLong()
  42 {
  43     // small positive number
  44     {
  45         BigInt bi(static_cast<sal_Int64>(42));
  46         CPPUNIT_ASSERT(!bi.IsZero());
  47         CPPUNIT_ASSERT(!bi.IsNeg());
  48         CPPUNIT_ASSERT(!bi.IsBig());
  49         CPPUNIT_ASSERT_EQUAL(static_cast<sal_Int32>(42), static_cast<sal_Int32>(bi));
  50     }
  51
  52     // small negative number
  53     {
  54         BigInt bi(static_cast<sal_Int64>(-42));
  55         CPPUNIT_ASSERT(!bi.IsZero());
  56         CPPUNIT_ASSERT(bi.IsNeg());
  57         CPPUNIT_ASSERT(!bi.IsBig());
  58         CPPUNIT_ASSERT_EQUAL(static_cast<sal_Int32>(-42), static_cast<sal_Int32>(bi));
  59     }
  60
  61     // positive number just fitting to sal_Int32
  62     {
  63         BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int32>::max()));
  64         CPPUNIT_ASSERT(!bi.IsZero());
  65         CPPUNIT_ASSERT(!bi.IsNeg());
  66         CPPUNIT_ASSERT(!bi.IsBig());
  67         CPPUNIT_ASSERT_EQUAL(std::numeric_limits<sal_Int32>::max(), static_cast<sal_Int32>(bi));
  68     }
  69
  70     // negative number just fitting to sal_Int32
  71     {
  72         BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int32>::min()));
  73         CPPUNIT_ASSERT(!bi.IsZero());
  74         CPPUNIT_ASSERT(bi.IsNeg());
  75         CPPUNIT_ASSERT(!bi.IsBig());
  76         CPPUNIT_ASSERT_EQUAL(std::numeric_limits<sal_Int32>::min(), static_cast<sal_Int32>(bi));
  77     }
  78
  79     // positive number not fitting to sal_Int32
  80     {
  81         BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int32>::max()) + 1);
  82         CPPUNIT_ASSERT(!bi.IsZero());
  83         CPPUNIT_ASSERT(!bi.IsNeg());
  84         CPPUNIT_ASSERT(bi.IsBig());
  85     }
  86
  87     // negative number not fitting to sal_Int32
  88     {
  89         BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int32>::min()) - 1);
  90         CPPUNIT_ASSERT(!bi.IsZero());
  91         CPPUNIT_ASSERT(bi.IsNeg());
  92         CPPUNIT_ASSERT(bi.IsBig());
  93     }
  94
  95     // max possible sal_Int64 negative number
  96     {
  97         BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int64>::min()));
  98         CPPUNIT_ASSERT(!bi.IsZero());
  99         CPPUNIT_ASSERT(bi.IsNeg());
 100         CPPUNIT_ASSERT(bi.IsBig());
 101         CPPUNIT_ASSERT_EQUAL(std::numeric_limits<sal_Int64>::min(), static_cast<sal_Int64>(bi));
 102     }
 103
 104     // max possible sal_Int64 positive number
 105     {
 106         BigInt bi(static_cast<sal_Int64>(std::numeric_limits<sal_Int64>::max()));
 107         CPPUNIT_ASSERT(!bi.IsZero());
 108         CPPUNIT_ASSERT(!bi.IsNeg());
 109         CPPUNIT_ASSERT(bi.IsBig());
 110         CPPUNIT_ASSERT_EQUAL(std::numeric_limits<sal_Int64>::max(), static_cast<sal_Int64>(bi));
 111     }
 112 }
 113
 114 void BigIntTest::testLenB1()
 115 {
 116     BigInt dy(2634022912);
 117     sal_Int64 md(-4177526784);
 118     sal_Int64 mn(2634022912);
 119     dy *= md;
 120     dy -= (mn - 1) / 2;
 121     dy /= mn;
 122
 123     CPPUNIT_ASSERT_EQUAL(sal_Int64(-4177526784), sal_Int64(dy));
 124 }
 125
 126 CPPUNIT_TEST_SUITE_REGISTRATION(BigIntTest);
 127 }
 128
 129 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */