GiSTnode* MXTree::ReadNode(const GiSTpath& path) const
{
char *firstBuffer = new char[store->PageSize()];
int startPage = (path.IsRoot() ? rootPage : path.Page());
store->Read(startPage, firstBuffer);
int pageNum = ceil((float)(((MXTnodeHeader *)firstBuffer)->numEntries*(EntrySize()+sizeof(GiSTpage))+sizeof(MXTnodeHeader))/(float)PAGE_SIZE);
GiSTnode *node = new MXTnode(pageNum);
node->SetTree((GiST *)this);
node->Path() = path;
if (pageNum > 1) {
char *buffer = new char[store->PageSize()*pageNum];
memset(buffer, 0, store->PageSize()*pageNum);
memcpy(buffer, firstBuffer, store->PageSize());
((MXTfile *)store)->Read(startPage+1, buffer+store->PageSize(), pageNum-1); // do the deed
node->Unpack(buffer);
delete[] buffer;
} else {
node->Unpack(firstBuffer);
}
delete[] firstBuffer;
return node;
}
GiSTnode*
GiST::ReadNode (const GiSTpath& path) const
{
char *buf = new char[store->PageSize()];
GiSTnode *node = NewNode((GiST *)this);
store->Read(path.Page(), buf); // do the deed
node->Unpack(buf);
#ifdef PRINTING_OBJECTS
if (debug) {
cout << "READ PAGE " << path.Page() << ":\n";
node->Print(cout);
}
#endif
node->Path() = path;
delete []buf;
return node;
}