src/test/scriptnum_tests.cpp

   1 // Copyright (c) 2012-2015 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include <test/scriptnum10.h>
   6 #include <script/script.h>
   7 #include <test/test_bitcoin.h>
   8
   9 #include <boost/test/unit_test.hpp>
  10 #include <limits.h>
  11 #include <stdint.h>
  12
  13 BOOST_FIXTURE_TEST_SUITE(scriptnum_tests, BasicTestingSetup)
  14
  15 /** A selection of numbers that do not trigger int64_t overflow
  16  *  when added/subtracted. */
  17 static const int64_t values[] = { 0, 1, -2, 127, 128, -255, 256, (1LL << 15) - 1, -(1LL << 16), (1LL << 24) - 1, (1LL << 31), 1 - (1LL << 32), 1LL << 40 };
  18
  19 static const int64_t offsets[] = { 1, 0x79, 0x80, 0x81, 0xFF, 0x7FFF, 0x8000, 0xFFFF, 0x10000};
  20
  21 static bool verify(const CScriptNum10& bignum, const CScriptNum& scriptnum)
  22 {
  23     return bignum.getvch() == scriptnum.getvch() && bignum.getint() == scriptnum.getint();
  24 }
  25
  26 static void CheckCreateVch(const int64_t& num)
  27 {
  28     CScriptNum10 bignum(num);
  29     CScriptNum scriptnum(num);
  30     BOOST_CHECK(verify(bignum, scriptnum));
  31
  32     CScriptNum10 bignum2(bignum.getvch(), false);
  33     CScriptNum scriptnum2(scriptnum.getvch(), false);
  34     BOOST_CHECK(verify(bignum2, scriptnum2));
  35
  36     CScriptNum10 bignum3(scriptnum2.getvch(), false);
  37     CScriptNum scriptnum3(bignum2.getvch(), false);
  38     BOOST_CHECK(verify(bignum3, scriptnum3));
  39 }
  40
  41 static void CheckCreateInt(const int64_t& num)
  42 {
  43     CScriptNum10 bignum(num);
  44     CScriptNum scriptnum(num);
  45     BOOST_CHECK(verify(bignum, scriptnum));
  46     BOOST_CHECK(verify(CScriptNum10(bignum.getint()), CScriptNum(scriptnum.getint())));
  47     BOOST_CHECK(verify(CScriptNum10(scriptnum.getint()), CScriptNum(bignum.getint())));
  48     BOOST_CHECK(verify(CScriptNum10(CScriptNum10(scriptnum.getint()).getint()), CScriptNum(CScriptNum(bignum.getint()).getint())));
  49 }
  50
  51
  52 static void CheckAdd(const int64_t& num1, const int64_t& num2)
  53 {
  54     const CScriptNum10 bignum1(num1);
  55     const CScriptNum10 bignum2(num2);
  56     const CScriptNum scriptnum1(num1);
  57     const CScriptNum scriptnum2(num2);
  58     CScriptNum10 bignum3(num1);
  59     CScriptNum10 bignum4(num1);
  60     CScriptNum scriptnum3(num1);
  61     CScriptNum scriptnum4(num1);
  62
  63     // int64_t overflow is undefined.
  64     bool invalid = (((num2 > 0) && (num1 > (std::numeric_limits<int64_t>::max() - num2))) ||
  65                     ((num2 < 0) && (num1 < (std::numeric_limits<int64_t>::min() - num2))));
  66     if (!invalid)
  67     {
  68         BOOST_CHECK(verify(bignum1 + bignum2, scriptnum1 + scriptnum2));
  69         BOOST_CHECK(verify(bignum1 + bignum2, scriptnum1 + num2));
  70         BOOST_CHECK(verify(bignum1 + bignum2, scriptnum2 + num1));
  71     }
  72 }
  73
  74 static void CheckNegate(const int64_t& num)
  75 {
  76     const CScriptNum10 bignum(num);
  77     const CScriptNum scriptnum(num);
  78
  79     // -INT64_MIN is undefined
  80     if (num != std::numeric_limits<int64_t>::min())
  81         BOOST_CHECK(verify(-bignum, -scriptnum));
  82 }
  83
  84 static void CheckSubtract(const int64_t& num1, const int64_t& num2)
  85 {
  86     const CScriptNum10 bignum1(num1);
  87     const CScriptNum10 bignum2(num2);
  88     const CScriptNum scriptnum1(num1);
  89     const CScriptNum scriptnum2(num2);
  90
  91     // int64_t overflow is undefined.
  92     bool invalid = ((num2 > 0 && num1 < std::numeric_limits<int64_t>::min() + num2) ||
  93                     (num2 < 0 && num1 > std::numeric_limits<int64_t>::max() + num2));
  94     if (!invalid)
  95     {
  96         BOOST_CHECK(verify(bignum1 - bignum2, scriptnum1 - scriptnum2));
  97         BOOST_CHECK(verify(bignum1 - bignum2, scriptnum1 - num2));
  98     }
  99
 100     invalid = ((num1 > 0 && num2 < std::numeric_limits<int64_t>::min() + num1) ||
 101                (num1 < 0 && num2 > std::numeric_limits<int64_t>::max() + num1));
 102     if (!invalid)
 103     {
 104         BOOST_CHECK(verify(bignum2 - bignum1, scriptnum2 - scriptnum1));
 105         BOOST_CHECK(verify(bignum2 - bignum1, scriptnum2 - num1));
 106     }
 107 }
 108
 109 static void CheckCompare(const int64_t& num1, const int64_t& num2)
 110 {
 111     const CScriptNum10 bignum1(num1);
 112     const CScriptNum10 bignum2(num2);
 113     const CScriptNum scriptnum1(num1);
 114     const CScriptNum scriptnum2(num2);
 115
 116     BOOST_CHECK((bignum1 == bignum1) == (scriptnum1 == scriptnum1));
 117     BOOST_CHECK((bignum1 != bignum1) ==  (scriptnum1 != scriptnum1));
 118     BOOST_CHECK((bignum1 < bignum1) ==  (scriptnum1 < scriptnum1));
 119     BOOST_CHECK((bignum1 > bignum1) ==  (scriptnum1 > scriptnum1));
 120     BOOST_CHECK((bignum1 >= bignum1) ==  (scriptnum1 >= scriptnum1));
 121     BOOST_CHECK((bignum1 <= bignum1) ==  (scriptnum1 <= scriptnum1));
 122
 123     BOOST_CHECK((bignum1 == bignum1) == (scriptnum1 == num1));
 124     BOOST_CHECK((bignum1 != bignum1) ==  (scriptnum1 != num1));
 125     BOOST_CHECK((bignum1 < bignum1) ==  (scriptnum1 < num1));
 126     BOOST_CHECK((bignum1 > bignum1) ==  (scriptnum1 > num1));
 127     BOOST_CHECK((bignum1 >= bignum1) ==  (scriptnum1 >= num1));
 128     BOOST_CHECK((bignum1 <= bignum1) ==  (scriptnum1 <= num1));
 129
 130     BOOST_CHECK((bignum1 == bignum2) ==  (scriptnum1 == scriptnum2));
 131     BOOST_CHECK((bignum1 != bignum2) ==  (scriptnum1 != scriptnum2));
 132     BOOST_CHECK((bignum1 < bignum2) ==  (scriptnum1 < scriptnum2));
 133     BOOST_CHECK((bignum1 > bignum2) ==  (scriptnum1 > scriptnum2));
 134     BOOST_CHECK((bignum1 >= bignum2) ==  (scriptnum1 >= scriptnum2));
 135     BOOST_CHECK((bignum1 <= bignum2) ==  (scriptnum1 <= scriptnum2));
 136
 137     BOOST_CHECK((bignum1 == bignum2) ==  (scriptnum1 == num2));
 138     BOOST_CHECK((bignum1 != bignum2) ==  (scriptnum1 != num2));
 139     BOOST_CHECK((bignum1 < bignum2) ==  (scriptnum1 < num2));
 140     BOOST_CHECK((bignum1 > bignum2) ==  (scriptnum1 > num2));
 141     BOOST_CHECK((bignum1 >= bignum2) ==  (scriptnum1 >= num2));
 142     BOOST_CHECK((bignum1 <= bignum2) ==  (scriptnum1 <= num2));
 143 }
 144
 145 static void RunCreate(const int64_t& num)
 146 {
 147     CheckCreateInt(num);
 148     CScriptNum scriptnum(num);
 149     if (scriptnum.getvch().size() <= CScriptNum::nDefaultMaxNumSize)
 150         CheckCreateVch(num);
 151     else
 152     {
 153         BOOST_CHECK_THROW (CheckCreateVch(num), scriptnum10_error);
 154     }
 155 }
 156
 157 static void RunOperators(const int64_t& num1, const int64_t& num2)
 158 {
 159     CheckAdd(num1, num2);
 160     CheckSubtract(num1, num2);
 161     CheckNegate(num1);
 162     CheckCompare(num1, num2);
 163 }
 164
 165 BOOST_AUTO_TEST_CASE(creation)
 166 {
 167     for(size_t i = 0; i < sizeof(values) / sizeof(values[0]); ++i)
 168     {
 169         for(size_t j = 0; j < sizeof(offsets) / sizeof(offsets[0]); ++j)
 170         {
 171             RunCreate(values[i]);
 172             RunCreate(values[i] + offsets[j]);
 173             RunCreate(values[i] - offsets[j]);
 174         }
 175     }
 176 }
 177
 178 BOOST_AUTO_TEST_CASE(operators)
 179 {
 180     for(size_t i = 0; i < sizeof(values) / sizeof(values[0]); ++i)
 181     {
 182         for(size_t j = 0; j < sizeof(offsets) / sizeof(offsets[0]); ++j)
 183         {
 184             RunOperators(values[i], values[i]);
 185             RunOperators(values[i], -values[i]);
 186             RunOperators(values[i], values[j]);
 187             RunOperators(values[i], -values[j]);
 188             RunOperators(values[i] + values[j], values[j]);
 189             RunOperators(values[i] + values[j], -values[j]);
 190             RunOperators(values[i] - values[j], values[j]);
 191             RunOperators(values[i] - values[j], -values[j]);
 192             RunOperators(values[i] + values[j], values[i] + values[j]);
 193             RunOperators(values[i] + values[j], values[i] - values[j]);
 194             RunOperators(values[i] - values[j], values[i] + values[j]);
 195             RunOperators(values[i] - values[j], values[i] - values[j]);
 196         }
 197     }
 198 }
 199
 200 BOOST_AUTO_TEST_SUITE_END()