Function SafeAdd

Libraries/unrar/arcread.cpp:131–134

Return f in case of signed integer overflow or negative parameters or v1+v2 otherwise. We use it for file offsets, which are signed for compatibility with off_t in POSIX file functions and third party code. Signed integer overflow is the undefined behavior according to C++ standard and it causes fuzzers to complain.

// Signed integer overflow is the undefined behavior according to
// C++ standard and it causes fuzzers to complain.
inline int64 SafeAdd(int64 v1,int64 v2,int64 f)
{
  return v1>=0 && v2>=0 && v1<=MAX_INT64-v2 ? v1+v2 : f;
}


size_t Archive::ReadHeader15()