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0030550: Coding - Integer overflow in Standard_CString HashCodes

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0030551: Foundation Classes - Integer overflow in NCollection_CellFilter HashCode

Signed integers are not used in hash code functions now to prevent undefined behavior on left shift operations with signed integers.
A possibility of negative values of hash codes is eliminated.
INT_MAX → IntegerLast() in hash code functions.
All found hash code functions behaves uniformly now: they return a value in the range [1, theUpperBound]. Relevant comments are added to such functions.
This commit is contained in:
tiv
2019-03-28 12:42:41 +03:00
committed by bugmaster
parent 833034f301
commit 2b2be3fb82
89 changed files with 878 additions and 580 deletions
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10
src/TDF/TDF_LabelMapHasher.hxx
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@@ -22,11 +22,13 @@
class TDF_LabelMapHasher
{
public:
//! Returns a HasCode value for the Key <K> in the range 0..Upper.
static Standard_Integer HashCode(const TDF_Label& aLab, const Standard_Integer Upper)
//! Computes a hash code for the given label, in the range [1, theUpperBound]
//! @param theLabel the label which hash code is to be computed
//! @param theUpperBound the upper bound of the range a computing hash code must be within
//! @return a computed hash code, in the range [1, theUpperBound]
static Standard_Integer HashCode(const TDF_Label& theLabel, const Standard_Integer theUpperBound)
{
return ::HashCode((Standard_Address)aLab.myLabelNode, Upper);
return ::HashCode(theLabel.myLabelNode, theUpperBound);
}
//! Returns True when the two keys are the same. Two