[Bro-Dev] #908: Need for function bytestring_to_double

Bro Tracker bro at tracker.bro-ids.org
Thu Oct 25 17:14:29 PDT 2012

#908: Need for function bytestring_to_double
  Reporter:  carsten          |      Owner:
      Type:  Feature Request  |     Status:  needs information
  Priority:  Normal           |  Milestone:  Bro2.2
 Component:  Bro              |    Version:  git/master
Resolution:                   |   Keywords:

Comment (by matthias):

 Replying to [comment:7 jsiwek]:
 > > - there is a check that the length of bytestring equals the length of
 the internal representation of double in "if ( s->Len() != sizeof(d))".
 > Maybe it also needs a check that `sizeof(uint64) == sizeof(double)`
 since the bytes are copied to `uint64` storage first.

 I'm not entirely convinced that this is the right solution. In memory, a
 double is indeed 64 bits, however, double-precision registers are 80 bits
 on x86 [1]. Consequently, if a compiler decides to hold a double purely in
 a register, you will see truncation.


 [1] http://en.wikipedia.org/wiki/Extended_precision

Ticket URL: <http://tracker.bro-ids.org/bro/ticket/908#comment:9>
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