#ifdef CHANGED
#include "bitmap.h"
#include "pageprovider.h"
#include "system.h"

PageProvider::PageProvider(int n) {
    DEBUG ('p', "PageProvider constructor, pages: %i\n", n);
	page = new BitMap(n);
    page->Mark(0);
}

PageProvider::~PageProvider(){
	delete page;
}

int PageProvider::GetEmptyPage() {
	int newPage = page->Find();
    if(newPage == -1)
        return -1;
    memset(machine->mainMemory+newPage * PageSize, 0, PageSize);
    DEBUG ('p', "PageProvider: GetEmpryPage() allocated page: %i\n", newPage);
    return newPage;
}

void PageProvider::ReleasePage(int n) {
    DEBUG ('p', "Release page: %d\n", n);
    page->Clear(n);
}

int PageProvider::NumAvailPage() {
    return page->NumClear();
}

#endif //CHANGED