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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 <atomic>
#include <gmp.h>
namespace Botan {
namespace {
/*
* For keeping track of existing GMP_Engines and only
* resetting the memory when none are in use.
*/
std::atomic<size_t> gmp_alloc_refcnt(0);
/*
* Allocation Function for GNU MP
*/
void* gmp_malloc(size_t n)
{
// Maintain alignment, mlock goes for sizeof(T) alignment
if(n % 8 == 0)
return secure_allocator<u64bit>().allocate(n / 8);
else if(n % 4 == 0)
return secure_allocator<u32bit>().allocate(n / 4);
else if(n % 2 == 0)
return secure_allocator<u16bit>().allocate(n / 2);
return secure_allocator<byte>().allocate(n);
}
/*
* Deallocation Function for GNU MP
*/
void gmp_free(void* ptr, size_t n)
{
secure_allocator<byte>().deallocate(static_cast<byte*>(ptr), n);
}
/*
* Reallocation Function for GNU MP
*/
void* gmp_realloc(void* ptr, size_t old_n, size_t new_n)
{
void* new_buf = gmp_malloc(new_n);
std::memcpy(new_buf, ptr, std::min(old_n, new_n));
gmp_free(ptr, old_n);
return new_buf;
}
}
/*
* GMP_Engine Constructor
*/
GMP_Engine::GMP_Engine()
{
/*
if(gmp_alloc_refcnt == 0)
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);
*/
}
}
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