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Return infinity if binary exponent is too large

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This commit is contained in:
abolz 2018-06-15 12:59:05 +02:00
parent 7acbb87c2b
commit cb009f3050
1 changed files with 5 additions and 1 deletions
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6
include/rapidjson/internal/diyfp.h
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@ -20,6 +20,7 @@
#define RAPIDJSON_DIYFP_H_ #define RAPIDJSON_DIYFP_H_
#include "../rapidjson.h" #include "../rapidjson.h"
#include <limits>
#if defined(_MSC_VER) && defined(_M_AMD64) && !defined(__INTEL_COMPILER) #if defined(_MSC_VER) && defined(_M_AMD64) && !defined(__INTEL_COMPILER)
#include <intrin.h> #include <intrin.h>
@ -146,7 +147,10 @@ struct DiyFp {
// Underflow. // Underflow.
return 0.0; return 0.0;
} }
RAPIDJSON_ASSERT(e < kDpMaxExponent); if (e >= kDpMaxExponent) {
// Overflow.
return std::numeric_limits<double>::infinity();
}
const uint64_t be = (e == kDpDenormalExponent && (f & kDpHiddenBit) == 0) ? 0 : const uint64_t be = (e == kDpDenormalExponent && (f & kDpHiddenBit) == 0) ? 0 :
static_cast<uint64_t>(e + kDpExponentBias); static_cast<uint64_t>(e + kDpExponentBias);
u.u64 = (f & kDpSignificandMask) | (be << kDpSignificandSize); u.u64 = (f & kDpSignificandMask) | (be << kDpSignificandSize);