more TDB

source/libs/tdb/src/db/tdbBtree.c

@@ -22,11 +22,11 @@ struct SBTree {
   SPager *       pPager;
   FKeyComparator kcmpr;
   u8             fanout;
+  int            pageSize;
   int            maxLocal;
   int            minLocal;
   int            maxLeaf;
   int            minLeaf;
-  int            nPayload;
 };
 
 typedef struct SPgHdr {
@@ -85,6 +85,16 @@ int tdbBtreeOpen(SPgno rtPgno, int keyLen, int valLen, SPager *pPager, FKeyCompa
     ASSERT(0);
     // TODO: pBt->fanout = 0;
   }
+  // pBt->pageSize
+  pBt->pageSize = tdbPagerGetPageSize(pPager);
+  // pBt->maxLocal
+  pBt->maxLocal = (pBt->pageSize - sizeof(SPageHdr)) / pBt->fanout;
+  // pBt->minLocal
+  pBt->minLocal = (pBt->pageSize - sizeof(SPageHdr)) / pBt->fanout / 2;
+  // pBt->maxLeaf
+  pBt->maxLeaf = pBt->pageSize - sizeof(SPageHdr);
+  // pBt->minLeaf
+  pBt->minLeaf = pBt->minLocal;
 
   *ppBt = pBt;
   return 0;
@@ -277,11 +287,11 @@ static int tdbDefaultKeyCmprFn(const void *pKey1, int keyLen1, const void *pKey2
   return cret;
 }
 
-static void tdbBtreeZeroPage(SPageHandle *pPage, int flags) {
+static void tdbBtreeZeroPage(SMemPage *pPage, int flags) {
   // TODO
 }
 
-static int tdbBtreeInitPage(SPageHandle *pPage) {
+static int tdbBtreeInitPage(SMemPage *pPage) {
   // TODO
   return 0;
 }

source/libs/tdb/src/db/tdbEnv.c

@@ -48,7 +48,7 @@ int tdbEnvOpen(const char *rootDir, int pageSize, int cacheSize, STEnv **ppEnv)
 
   pEnv->jfd = -1;
 
-  ret = tdbPCacheOpen(pageSize, cacheSize, sizeof(SPageHandle), &(pEnv->pCache));
+  ret = tdbPCacheOpen(pageSize, cacheSize, sizeof(SMemPage), &(pEnv->pCache));
   if (ret < 0) {
     return -1;
   }

source/libs/tdb/src/db/tdbPCache.c

@@ -268,3 +268,5 @@ static int tdbPCacheOpenImpl(SPCache *pCache) {
 
   return 0;
 }
+
+int tdbPCacheGetPageSize(SPCache *pCache) { return pCache->pageSize; }

source/libs/tdb/src/db/tdbPager.c

@@ -87,6 +87,7 @@ int tdbPagerOpen(SPCache *pCache, const char *fileName, SPager **ppPager) {
   }
 
   pPager->jfd = -1;
+  pPager->pageSize = tdbPCacheGetPageSize(pCache);
 
   *ppPager = pPager;
   return 0;
@@ -239,3 +240,5 @@ static int tdbPagerReadPage(SPager *pPager, SPage *pPage) {
   }
   return 0;
 }
+
+int tdbPagerGetPageSize(SPager *pPager) { return pPager->pageSize; }

source/libs/tdb/src/inc/tdbPCache.h

@@ -45,6 +45,7 @@ int    tdbPCacheClose(SPCache *pCache);
 SPage *tdbPCacheFetch(SPCache *pCache, const SPgid *pPgid, bool alcNewPage);
 void   tdbPCacheFetchFinish(SPCache *pCache, SPage *pPage);
 void   tdbPCacheRelease(SPage *pPage);
+int    tdbPCacheGetPageSize(SPCache *pCache);
 
 #ifdef __cplusplus
 }

source/libs/tdb/src/inc/tdbPage.h

@@ -21,17 +21,13 @@ extern "C" {
 #endif
 
 typedef struct __attribute__((__packed__)) {
-  u8  flags;
+  u16 flags;
   u16 nCells;
   u16 cellCont;
   u16 freeCell;
   u16 nFree;
 } SPageHdr;
 
-typedef struct __attribute__((__packed__)) {
-  SPgno nPgno;
-} SOfPageHdr;
-
 typedef struct {
   void *    pData;
   SPageHdr *pPageHdr;
@@ -41,7 +37,7 @@ typedef struct {
   int       vLen;
   int       maxLocal;
   int       minLocal;
-} SPageHandle;
+} SMemPage;
 
 #ifdef __cplusplus
 }

source/libs/tdb/src/inc/tdbPager.h

@@ -28,6 +28,7 @@ int    tdbPagerWrite(SPager *pFile, SPage *pPage);
 int    tdbPagerAllocPage(SPager *pFile, SPage **ppPage, SPgno *ppgno);
 int    tdbPagerBegin(SPager *pFile);
 int    tdbPagerCommit(SPager *pFile);
+int    tdbPagerGetPageSize(SPager *pPager);
 
 #ifdef __cplusplus
 }