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/*
* GNU MP Memory Handlers
* (C) 1999-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/internal/gnump_engine.h>
#include <cstring>
#include <gmp.h>
namespace Botan {
namespace {
/*
* Allocator used by GNU MP
*/
Allocator* gmp_alloc = 0;
size_t gmp_alloc_refcnt = 0;
/*
* Allocation Function for GNU MP
*/
void* gmp_malloc(size_t n)
{
return gmp_alloc->allocate(n);
}
/*
* Reallocation Function for GNU MP
*/
void* gmp_realloc(void* ptr, size_t old_n, size_t new_n)
{
void* new_buf = gmp_alloc->allocate(new_n);
std::memcpy(new_buf, ptr, std::min(old_n, new_n));
gmp_alloc->deallocate(ptr, old_n);
return new_buf;
}
/*
* Deallocation Function for GNU MP
*/
void gmp_free(void* ptr, size_t n)
{
gmp_alloc->deallocate(ptr, n);
}
}
/*
* GMP_Engine Constructor
*/
GMP_Engine::GMP_Engine()
{
if(gmp_alloc == 0)
{
gmp_alloc = Allocator::get(true);
mp_set_memory_functions(gmp_malloc, gmp_realloc, gmp_free);
}
++gmp_alloc_refcnt;
}
GMP_Engine::~GMP_Engine()
{
--gmp_alloc_refcnt;
if(gmp_alloc_refcnt == 0)
{
mp_set_memory_functions(NULL, NULL, NULL);
gmp_alloc = 0;
}
}
}
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