src/test/scriptnum_tests.cpp

   1 // Copyright (c) 2012-2014 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 "bignum.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 static const int64_t values[] = \
  16 { 0, 1, CHAR_MIN, CHAR_MAX, UCHAR_MAX, SHRT_MIN, USHRT_MAX, INT_MIN, INT_MAX, UINT_MAX, LONG_MIN, LONG_MAX };
  17 static const int64_t offsets[] = { 1, 0x79, 0x80, 0x81, 0xFF, 0x7FFF, 0x8000, 0xFFFF, 0x10000};
  18
  19 static bool verify(const CBigNum& bignum, const CScriptNum& scriptnum)
  20 {
  21     return bignum.getvch() == scriptnum.getvch() && bignum.getint() == scriptnum.getint();
  22 }
  23
  24 static void CheckCreateVch(const int64_t& num)
  25 {
  26     CBigNum bignum(num);
  27     CScriptNum scriptnum(num);
  28     BOOST_CHECK(verify(bignum, scriptnum));
  29
  30     CBigNum bignum2(bignum.getvch());
  31     CScriptNum scriptnum2(scriptnum.getvch(), false);
  32     BOOST_CHECK(verify(bignum2, scriptnum2));
  33
  34     CBigNum bignum3(scriptnum2.getvch());
  35     CScriptNum scriptnum3(bignum2.getvch(), false);
  36     BOOST_CHECK(verify(bignum3, scriptnum3));
  37 }
  38
  39 static void CheckCreateInt(const int64_t& num)
  40 {
  41     CBigNum bignum(num);
  42     CScriptNum scriptnum(num);
  43     BOOST_CHECK(verify(bignum, scriptnum));
  44     BOOST_CHECK(verify(bignum.getint(), CScriptNum(scriptnum.getint())));
  45     BOOST_CHECK(verify(scriptnum.getint(), CScriptNum(bignum.getint())));
  46     BOOST_CHECK(verify(CBigNum(scriptnum.getint()).getint(), CScriptNum(CScriptNum(bignum.getint()).getint())));
  47 }
  48
  49
  50 static void CheckAdd(const int64_t& num1, const int64_t& num2)
  51 {
  52     const CBigNum bignum1(num1);
  53     const CBigNum bignum2(num2);
  54     const CScriptNum scriptnum1(num1);
  55     const CScriptNum scriptnum2(num2);
  56     CBigNum bignum3(num1);
  57     CBigNum bignum4(num1);
  58     CScriptNum scriptnum3(num1);
  59     CScriptNum scriptnum4(num1);
  60
  61     // int64_t overflow is undefined.
  62     bool invalid = (((num2 > 0) && (num1 > (std::numeric_limits<int64_t>::max() - num2))) ||
  63                     ((num2 < 0) && (num1 < (std::numeric_limits<int64_t>::min() - num2))));
  64     if (!invalid)
  65     {
  66         BOOST_CHECK(verify(bignum1 + bignum2, scriptnum1 + scriptnum2));
  67         BOOST_CHECK(verify(bignum1 + bignum2, scriptnum1 + num2));
  68         BOOST_CHECK(verify(bignum1 + bignum2, scriptnum2 + num1));
  69     }
  70 }
  71
  72 static void CheckNegate(const int64_t& num)
  73 {
  74     const CBigNum bignum(num);
  75     const CScriptNum scriptnum(num);
  76
  77     // -INT64_MIN is undefined
  78     if (num != std::numeric_limits<int64_t>::min())
  79         BOOST_CHECK(verify(-bignum, -scriptnum));
  80 }
  81
  82 static void CheckSubtract(const int64_t& num1, const int64_t& num2)
  83 {
  84     const CBigNum bignum1(num1);
  85     const CBigNum bignum2(num2);
  86     const CScriptNum scriptnum1(num1);
  87     const CScriptNum scriptnum2(num2);
  88     bool invalid = false;
  89
  90     // int64_t overflow is undefined.
  91     invalid = ((num2 > 0 && num1 < std::numeric_limits<int64_t>::min() + num2) ||
  92                (num2 < 0 && num1 > std::numeric_limits<int64_t>::max() + num2));
  93     if (!invalid)
  94     {
  95         BOOST_CHECK(verify(bignum1 - bignum2, scriptnum1 - scriptnum2));
  96         BOOST_CHECK(verify(bignum1 - bignum2, scriptnum1 - num2));
  97     }
  98
  99     invalid = ((num1 > 0 && num2 < std::numeric_limits<int64_t>::min() + num1) ||
 100                (num1 < 0 && num2 > std::numeric_limits<int64_t>::max() + num1));
 101     if (!invalid)
 102     {
 103         BOOST_CHECK(verify(bignum2 - bignum1, scriptnum2 - scriptnum1));
 104         BOOST_CHECK(verify(bignum2 - bignum1, scriptnum2 - num1));
 105     }
 106 }
 107
 108 static void CheckCompare(const int64_t& num1, const int64_t& num2)
 109 {
 110     const CBigNum bignum1(num1);
 111     const CBigNum bignum2(num2);
 112     const CScriptNum scriptnum1(num1);
 113     const CScriptNum scriptnum2(num2);
 114
 115     BOOST_CHECK((bignum1 == bignum1) == (scriptnum1 == scriptnum1));
 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
 122     BOOST_CHECK((bignum1 == bignum1) == (scriptnum1 == num1));
 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
 129     BOOST_CHECK((bignum1 == bignum2) ==  (scriptnum1 == scriptnum2));
 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
 136     BOOST_CHECK((bignum1 == bignum2) ==  (scriptnum1 == num2));
 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 }
 143
 144 static void RunCreate(const int64_t& num)
 145 {
 146     CheckCreateInt(num);
 147     CScriptNum scriptnum(num);
 148     if (scriptnum.getvch().size() <= CScriptNum::nDefaultMaxNumSize)
 149         CheckCreateVch(num);
 150     else
 151     {
 152         BOOST_CHECK_THROW (CheckCreateVch(num), scriptnum_error);
 153     }
 154 }
 155
 156 static void RunOperators(const int64_t& num1, const int64_t& num2)
 157 {
 158     CheckAdd(num1, num2);
 159     CheckSubtract(num1, num2);
 160     CheckNegate(num1);
 161     CheckCompare(num1, num2);
 162 }
 163
 164 BOOST_AUTO_TEST_CASE(creation)
 165 {
 166     for(size_t i = 0; i < sizeof(values) / sizeof(values[0]); ++i)
 167     {
 168         for(size_t j = 0; j < sizeof(offsets) / sizeof(offsets[0]); ++j)
 169         {
 170             RunCreate(values[i]);
 171             RunCreate(values[i] + offsets[j]);
 172             RunCreate(values[i] - offsets[j]);
 173         }
 174     }
 175 }
 176
 177 BOOST_AUTO_TEST_CASE(operators)
 178 {
 179     for(size_t i = 0; i < sizeof(values) / sizeof(values[0]); ++i)
 180     {
 181         for(size_t j = 0; j < sizeof(offsets) / sizeof(offsets[0]); ++j)
 182         {
 183             RunOperators(values[i], values[i]);
 184             RunOperators(values[i], -values[i]);
 185             RunOperators(values[i], values[j]);
 186             RunOperators(values[i], -values[j]);
 187             RunOperators(values[i] + values[j], 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[i] + 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         }
 196     }
 197 }
 198
 199 BOOST_AUTO_TEST_SUITE_END()