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Fix horrific performance found by gmaxwell.

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This commit is contained in:
Matt Corallo 2012-01-03 00:03:07 -08:00
parent 96d3bcb996
commit f7a9a11391
1 changed files with 33 additions and 1 deletions
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34
src/serialize.h
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@ -819,6 +819,38 @@ struct secure_allocator : public std::allocator<T>
};
//
// Allocator that clears its contents before deletion.
//
template<typename T>
struct zero_after_free_allocator : public std::allocator<T>
{
// MSVC8 default copy constructor is broken
typedef std::allocator<T> base;
typedef typename base::size_type size_type;
typedef typename base::difference_type difference_type;
typedef typename base::pointer pointer;
typedef typename base::const_pointer const_pointer;
typedef typename base::reference reference;
typedef typename base::const_reference const_reference;
typedef typename base::value_type value_type;
zero_after_free_allocator() throw() {}
zero_after_free_allocator(const zero_after_free_allocator& a) throw() : base(a) {}
template <typename U>
zero_after_free_allocator(const zero_after_free_allocator<U>& a) throw() : base(a) {}
~zero_after_free_allocator() throw() {}
template<typename _Other> struct rebind
{ typedef zero_after_free_allocator<_Other> other; };
void deallocate(T* p, std::size_t n)
{
if (p != NULL)
memset(p, 0, sizeof(T) * n);
std::allocator<T>::deallocate(p, n);
}
};
//
// Double ended buffer combining vector and stream-like interfaces.
@ -828,7 +860,7 @@ struct secure_allocator : public std::allocator<T>
class CDataStream
{
protected:
typedef std::vector<char, secure_allocator<char> > vector_type;
typedef std::vector<char, zero_after_free_allocator<char> > vector_type;
vector_type vch;
unsigned int nReadPos;
short state;