xxq250
/
homework-jianmu
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity

more TDB

This commit is contained in:
Hongze Cheng 2022-03-20 15:39:51 +00:00
parent 7d5030bc7f
commit 7a5985ae46
1 changed files with 26 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
source/libs/tdb/src/page/tdbPage.c
View File

@ -91,8 +91,8 @@ void tdbPageInit(SPage *pPage) {
int tdbPageInsertCell(SPage *pPage, int idx, SCell *pCell, int szCell) {
int nFree;
int ret;
int nCells;
int iOvfl;
int lidx; // local idx
SCell *pNewCell;
@ -100,32 +100,45 @@ int tdbPageInsertCell(SPage *pPage, int idx, SCell *pCell, int szCell) {
nFree = TDB_PAGE_NFREE(pPage);
nCells = TDB_PAGE_NCELLS(pPage);
iOvfl = 0;
for (; iOvfl < pPage->nOverflow; iOvfl++) {
if (pPage->aiOvfl[iOvfl] >= idx) {
break;
}
}
lidx = idx - iOvfl;
if (nFree >= szCell + TDB_PAGE_OFFSET_SIZE(pPage)) {
// page must has enough space to hold the cell locally
ret = tdbPageAllocate(pPage, szCell, &pNewCell);
ASSERT(ret == 0);
tdbPageAllocate(pPage, szCell, &pNewCell);
memcpy(pNewCell, pCell, szCell);
if (pPage->nOverflow == 0) {
lidx = idx;
} else {
// TODO
// lidx = ;
}
// no overflow cell exists in this page
u8 *src = pPage->pCellIdx + TDB_PAGE_OFFSET_SIZE(pPage) * lidx;
u8 *dest = src + TDB_PAGE_OFFSET_SIZE(pPage);
memmove(dest, src, pPage->pFreeStart - dest);
TDB_PAGE_CELL_OFFSET_AT_SET(pPage, lidx, TDB_PAGE_OFFSET_SIZE(pPage) * lidx);
TDB_PAGE_NCELLS_SET(pPage, nCells + 1);
ASSERT(pPage->pFreeStart == pPage->pCellIdx + TDB_PAGE_OFFSET_SIZE(pPage) * (nCells + 1));
} else {
// TODO: page not has enough space
pPage->apOvfl[pPage->nOverflow] = pCell;
pPage->aiOvfl[pPage->nOverflow] = idx;
// add the cell as an overflow cell
for (int i = pPage->nOverflow; i > iOvfl; i--) {
pPage->apOvfl[i] = pPage->apOvfl[i - 1];
pPage->aiOvfl[i] = pPage->aiOvfl[i - 1];
}
pPage->apOvfl[iOvfl] = pCell;
pPage->aiOvfl[iOvfl] = idx;
pPage->nOverflow++;
iOvfl++;
}
for (; iOvfl < pPage->nOverflow; iOvfl++) {
pPage->aiOvfl[iOvfl]++;
}
return 0;