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/*************************************************
* Basic Allocators Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/defalloc.h>
#include <botan/libstate.h>
#include <botan/util.h>
#include <cstdlib>
#include <cstring>
namespace Botan {
namespace {
/*************************************************
* Perform Memory Allocation *
*************************************************/
void* do_malloc(u32bit n, bool do_lock)
{
void* ptr = std::malloc(n);
if(!ptr)
return 0;
if(do_lock)
lock_mem(ptr, n);
std::memset(ptr, 0, n);
return ptr;
}
/*************************************************
* Perform Memory Deallocation *
*************************************************/
void do_free(void* ptr, u32bit n, bool do_lock)
{
if(!ptr)
return;
std::memset(ptr, 0, n);
if(do_lock)
unlock_mem(ptr, n);
std::free(ptr);
}
}
/*************************************************
* Malloc_Allocator's Allocation *
*************************************************/
void* Malloc_Allocator::alloc_block(u32bit n)
{
return do_malloc(n, false);
}
/*************************************************
* Malloc_Allocator's Deallocation *
*************************************************/
void Malloc_Allocator::dealloc_block(void* ptr, u32bit n)
{
do_free(ptr, n, false);
}
/*************************************************
* Locking_Allocator's Allocation *
*************************************************/
void* Locking_Allocator::alloc_block(u32bit n)
{
return do_malloc(n, true);
}
/*************************************************
* Locking_Allocator's Deallocation *
*************************************************/
void Locking_Allocator::dealloc_block(void* ptr, u32bit n)
{
do_free(ptr, n, true);
}
/*************************************************
* Get an allocator *
*************************************************/
Allocator* Allocator::get(bool locking)
{
std::string type = "";
if(!locking)
type = "malloc";
Allocator* alloc = global_state().get_allocator(type);
if(alloc)
return alloc;
throw Exception("Couldn't find an allocator to use in get_allocator");
}
}
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