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#include <stdio.h>
#include <string.h>
#include "h_object.h"
#include "h_util.h"
HStaticSmallAllocator::HStaticSmallAllocator(size_t aPageSize) :
HSmallAllocator(aPageSize)
{
char* tData = new char[sizeof(HDataPage) + aPageSize];
first = (HDataPage*)tData;
first->free = aPageSize;
first->next = NULL;
}
void HStaticSmallAllocator::tide()
{
HDataPage* p1;
for (HDataPage* p = first->next; p != NULL; p = p1) {
p1 = p->next;
delete p;
}
memset(&first->next, 0, pageSize + sizeof(void*));
first->free = pageSize;
first->next = NULL;
}
//====[ HSmallAllocator ]======================================================
HSmallAllocator::HSmallAllocator(size_t aPageSize) :
first(NULL),
pageSize(aPageSize)
{}
HSmallAllocator::~HSmallAllocator()
{
tide();
}
char* HSmallAllocator::placeStr(const char* str)
{
if (str == NULL)
str = "";
size_t len = strlen(str) + 1;
void* p = allocateSpace(len);
if (p == NULL)
return NULL;
memcpy(p, str, len);
return (char*)p;
}
void* HSmallAllocator::placeData(const void* data, size_t len)
{
void* p = allocateSpace(len);
if (p == NULL)
return NULL;
if (data != NULL)
memcpy(p, data, len);
return p;
}
void* HSmallAllocator::allocateSpace(size_t bytes)
{
HDataPage* p;
if (bytes > pageSize) {
size_t dataLen = sizeof(HDataPage) + bytes;
char* data = new char[dataLen];
memset(data, 0, dataLen);
if (first == NULL)
first = (HDataPage*)data;
else {
for (p = first; p->next != NULL; p = p->next)
;
p->next = (HDataPage*)data;
}
return data + sizeof(HDataPage);
}
for (p = first; p != NULL; p = p->next)
if (p->free >= bytes)
break;
if (p == NULL || p->free < bytes) {
size_t dataLen = sizeof(HDataPage) + pageSize;
char* data = new char[dataLen];
memset(data, 0, dataLen);
p = (HDataPage*)data;
p->free = pageSize;
p->next = first;
first = p;
}
char* res = (char*)(p + 1) + pageSize - p->free; p->free -= bytes;
return res;
}
void HSmallAllocator::tide()
{
HDataPage* p1;
for (HDataPage* p = first; p != 0; p = p1) {
p1 = p->next;
delete p;
}
first = NULL;
}
//=============================================================================
void* operator new(size_t bytes, HSmallAllocator& owner)
{
return owner.allocateSpace(bytes);
}
//=============================================================================
void* HSmallAllocatorObject::operator new(size_t bytes, HSmallAllocator& owner)
{
return owner.allocateSpace(bytes);
}
void* HSmallAllocatorObject::operator new[](size_t bytes, HSmallAllocator& owner) {
return owner.allocateSpace(bytes);
}
//=============================================================================
void* HSmartSmallAllocatorObject::operator new(size_t bytes, HSmallAllocator& owner)
{
char* result = (char*)owner.allocateSpace(bytes + sizeof(void*));
*(HSmallAllocator**)result = &owner;
return result + sizeof(void*);
}
void* HSmartSmallAllocatorObject::operator new[](size_t bytes, HSmallAllocator& owner) {
char* result = (char*)owner.allocateSpace(bytes + sizeof(void*));
*(HSmallAllocator**)result = &owner;
return result + sizeof(void*);
}
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