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/*************************************************
* GNU MP Memory Handlers Source File *
* (C) 1999-2008 The Botan Project *
*************************************************/
#include <botan/eng_gmp.h>
#include <cstring>
#include <gmp.h>
namespace Botan {
namespace {
/*************************************************
* Allocator used by GNU MP *
*************************************************/
Allocator* gmp_alloc = 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);
}
}
/*************************************************
* Set the GNU MP memory functions *
*************************************************/
void GMP_Engine::set_memory_hooks()
{
if(gmp_alloc == 0)
{
gmp_alloc = Allocator::get(true);
mp_set_memory_functions(gmp_malloc, gmp_realloc, gmp_free);
}
}
}
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