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Separate handling for pos/neg exp and improve pos exp overflow

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This commit is contained in:
Milo Yip 2015-04-24 22:50:42 +08:00
parent 93d13ad2ac
commit 735354efd3
2 changed files with 16 additions and 8 deletions
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23
include/rapidjson/reader.h
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@ -925,14 +925,21 @@ private:
if (s.Peek() >= '0' && s.Peek() <= '9') {
exp = s.Take() - '0';
while (s.Peek() >= '0' && s.Peek() <= '9') {
exp = exp * 10 + (s.Take() - '0');
if (exp > 308 && !expMinus) // exp > 308 should be rare, so it should be checked first.
RAPIDJSON_PARSE_ERROR(kParseErrorNumberTooBig, s.Tell());
else if (exp >= 429496729 && expMinus) { // Issue #313: prevent overflow exponent
while (s.Peek() >= '0' && s.Peek() <= '9') // Consume the rest of exponent
s.Take();
break;
if (expMinus) {
while (s.Peek() >= '0' && s.Peek() <= '9') {
exp = exp * 10 + (s.Take() - '0');
if (exp >= 429496729) { // Issue #313: prevent overflow exponent
while (s.Peek() >= '0' && s.Peek() <= '9') // Consume the rest of exponent
s.Take();
}
}
}
else { // positive exp
int maxExp = 308 - expFrac;
while (s.Peek() >= '0' && s.Peek() <= '9') {
exp = exp * 10 + (s.Take() - '0');
if (exp > maxExp)
RAPIDJSON_PARSE_ERROR(kParseErrorNumberTooBig, s.Tell());
}
}
}

1
test/unittest/readertest.cpp
View File

@ -229,6 +229,7 @@ static void TestParseDouble() {
TEST_DOUBLE(fullPrecision, "1e-00011111111111", 0.0); // Issue #313
TEST_DOUBLE(fullPrecision, "-1e-00011111111111", -0.0);
TEST_DOUBLE(fullPrecision, "1e-429496729", 0.0); // Maximum supported negative exponent
TEST_DOUBLE(fullPrecision, "0.017976931348623157e+310", 1.7976931348623157e+308); // Max double in another form
// Since