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more TDB

This commit is contained in:
Hongze Cheng 2022-03-15 08:04:25 +00:00
parent 0c9eb0fbc6
commit be09ef45f2
1 changed files with 64 additions and 42 deletions
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94
source/libs/tdb/src/db/tdbBtree.c
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@ -736,18 +736,13 @@ static int tdbBtreeBalance(SBtCursor *pCur) {
}
#endif
#ifndef TDB_BTREE_CELL
typedef struct {
/* Data */
} SCellEncoder;
#ifndef TDB_BTREE_CELL // =========================================================
typedef struct {
int kLen;
u8 *pKey;
int vLen;
u8 *pVal;
u8 kOverflow;
u8 vOverflow;
SPgno pgno;
u8 *pTmpSpace;
} SCellDecoder;
@ -830,41 +825,68 @@ static int tdbBtreeEncodeCell(SPage *pPage, void *pKey, int kLen, void *pVal, in
return 0;
}
static int tdbBtreeDecodeCell(SPage *pPage, SCell *pCell, SCellDecoder *pDecoder) {
static int tdbBtreeDecodePayload(SPage *pPage, const u8 *pPayload, SCellDecoder *pDecoder) {
int nPayload;
ASSERT(pDecoder->pKey == NULL);
if (pDecoder->pVal) {
nPayload = pDecoder->kLen + pDecoder->vLen;
} else {
nPayload = pDecoder->kLen;
}
if (nPayload <= pPage->maxLocal) {
// General case without overflow
pDecoder->pKey = (void *)pPayload;
if (pDecoder->pVal) {
pDecoder->pVal = (void *)(pPayload + pDecoder->vLen);
}
}
{
// TODO: handle overflow case
ASSERT(0);
}
return 0;
}
static int tdbBtreeDecodeCell(SPage *pPage, const SCell *pCell, SCellDecoder *pDecoder) {
u16 flags;
u8 leaf;
int nHeader;
int ret;
// Decode kLen
if (pPage->kLen != -1) {
pDecoder->vLen = pPage->kLen;
} else {
pCell += tdbGetVarInt(pCell, &pDecoder->kLen);
}
// Decode vLen
if (pPage->vLen != -1) {
pDecoder->vLen = pPage->vLen;
} else {
pCell += tdbGetVarInt(pCell, &(pDecoder->vLen));
}
nHeader = 0;
flags = TDB_PAGE_FLAGS(pPage);
if (TDB_BTREE_PAGE_IS_LEAF(flags)) {
// For leaf page
// TODO
} else {
// For interior page
ASSERT(pDecoder->vLen == sizeof(SPgno));
leaf = TDB_BTREE_PAGE_IS_LEAF(flags);
pDecoder->pVal = pCell;
pDecoder->kOverflow = 0;
pCell = pCell + pPage->vLen;
pDecoder->pKey = pCell;
if (0) {
pDecoder->vOverflow = 1;
// 1. Decode header part
if (pPage->kLen == TDB_VARIANT_LEN) {
nHeader += tdbGetVarInt(pCell + nHeader, &(pDecoder->kLen));
} else {
pDecoder->vOverflow = 0;
pDecoder->kLen = pPage->kLen;
}
if (pPage->vLen == TDB_VARIANT_LEN) {
nHeader += tdbGetVarInt(pCell + nHeader, &(pDecoder->vLen));
} else {
pDecoder->vLen = pPage->vLen;
}
if (!leaf) {
ASSERT(pPage->vLen == sizeof(SPgno));
pDecoder->pgno = ((SPgno *)(pCell + nHeader))[0];
pDecoder->pVal = (u8 *)(&(pDecoder->pgno));
nHeader = nHeader + sizeof(SPgno);
}
// 2. Decode payload part
ret = tdbBtreeDecodePayload(pPage, pCell + nHeader, pDecoder);
if (ret < 0) {
return -1;
}
return 0;