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Limit exponents

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This commit is contained in:
abolz 2018-06-15 17:10:36 +02:00
parent 6cd5cd7b94
commit a2813b6739
1 changed files with 10 additions and 3 deletions
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13
include/rapidjson/internal/strtod.h
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@ -20,6 +20,7 @@
#include "diyfp.h"
#include "pow10.h"
#include <climits>
#include <limits>
RAPIDJSON_NAMESPACE_BEGIN
namespace internal {
@ -260,16 +261,22 @@ inline double StrtodFullPrecision(double d, int p, const char* decimals, size_t
}
// Trim right-most digits
const int kMaxDecimalDigit = 780;
const int kMaxDecimalDigit = 767 + 1;
if (dLen > kMaxDecimalDigit) {
dExp += dLen - kMaxDecimalDigit;
dLen = kMaxDecimalDigit;
}
// If too small, underflow to zero
if (dLen + dExp < -324)
// If too small, underflow to zero.
// Any x <= 10^-324 is interpreted as zero.
if (dLen + dExp <= -324)
return 0.0;
// If too large, overflow to infinity.
// Any x >= 10^309 is interpreted as +infinity.
if (dLen + dExp > 309)
return std::numeric_limits<double>::infinity();
if (StrtodDiyFp(decimals, dLen, dExp, &result))
return result;