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Return 0 if binary exponent is too small

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This commit is contained in:
abolz 2018-06-15 11:32:32 +02:00
parent f5e5d47fac
commit 4e9b4f6d6a
2 changed files with 24 additions and 12 deletions
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5
include/rapidjson/internal/diyfp.h
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@ -142,7 +142,10 @@ struct DiyFp {
uint64_t u64;
}u;
RAPIDJSON_ASSERT(f <= kDpHiddenBit + kDpSignificandMask);
RAPIDJSON_ASSERT(e >= kDpDenormalExponent);
if (e < kDpDenormalExponent) {
// Underflow.
return 0.0;
}
RAPIDJSON_ASSERT(e < kDpMaxExponent);
const uint64_t be = (e == kDpDenormalExponent && (f & kDpHiddenBit) == 0) ? 0 :
static_cast<uint64_t>(e + kDpExponentBias);

9
test/unittest/readertest.cpp
View File

@ -392,6 +392,15 @@ static void TestParseDouble() {
"83723677529752585477247372368372368547354737253685475529752",
6223372036854775808.0);
TEST_DOUBLE(fullPrecision, "1e-325", 0.0);
TEST_DOUBLE(fullPrecision, "1e-324", 0.0);
TEST_DOUBLE(fullPrecision, "2e-324", 0.0);
TEST_DOUBLE(fullPrecision, "2.4703282292062327e-324", 0.0);
TEST_DOUBLE(fullPrecision, "2.4703282292062328e-324", 2.4703282292062328e-324);
TEST_DOUBLE(fullPrecision, "2.48e-324", 2.48e-324);
TEST_DOUBLE(fullPrecision, "2.5e-324", 2.5e-324);
#undef TEST_DOUBLE
}