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more TDB

This commit is contained in:
Hongze Cheng 2022-03-11 06:57:03 +00:00
parent 24bf28e293
commit bc00eb0e87
2 changed files with 34 additions and 2 deletions
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31
source/libs/tdb/src/db/tdbPage.c
View File

@ -51,7 +51,18 @@ int tdbPageDestroy(SPage *pPage, void (*xFree)(void *arg, void *ptr), void *arg)
} }
int tdbPageInsertCell(SPage *pPage, int idx, SCell *pCell, int szCell) { int tdbPageInsertCell(SPage *pPage, int idx, SCell *pCell, int szCell) {
int ret;
SCell *pTarget;
if (pPage->nOverflow || szCell + TDB_PAGE_CELL_OFFSET_SIZE(pPage) > pPage->nFree) {
// TODO // TODO
} else {
ret = tdbPageAllocate(pPage, szCell, &pTarget);
if (ret < 0) {
return -1;
}
}
return 0; return 0;
} }
@ -61,7 +72,20 @@ int tdbPageDropCell(SPage *pPage, int idx) {
} }
static int tdbPageAllocate(SPage *pPage, int size, SCell **ppCell) { static int tdbPageAllocate(SPage *pPage, int size, SCell **ppCell) {
// TODO SCell *pCell;
int szOffset;
szOffset = TDB_PAGE_CELL_OFFSET_SIZE(pPage);
ASSERT(pPage->nFree > size + szOffset);
if (pPage->pFreeEnd - pPage->pFreeStart > size + szOffset) {
pPage->pFreeEnd -= size;
pPage->pFreeStart += szOffset;
pCell = pPage->pFreeEnd;
} else {
}
return 0; return 0;
} }
@ -69,3 +93,8 @@ static int tdbPageFree(SPage *pPage, int idx, SCell *pCell, int size) {
// TODO // TODO
return 0; return 0;
} }
static int tdbPageDefragment(SPage *pPage) {
// TODO
return 0;
}

3
source/libs/tdb/src/inc/tdbPage.h
View File

@ -44,8 +44,11 @@ struct SPage {
SPageHdr *pPageHdr; SPageHdr *pPageHdr;
SPageFtr *pPageFtr; SPageFtr *pPageFtr;
u16 *aCellIdx; u16 *aCellIdx;
u8 *pFreeStart;
u8 *pFreeEnd;
int kLen; int kLen;
int vLen; int vLen;
int nFree;
int maxLocal; int maxLocal;
int minLocal; int minLocal;
int nOverflow; int nOverflow;