more TDB

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

@@ -26,6 +26,14 @@ typedef struct {
   pgsz_t offset;
 } SBtIdx;
 
+// Btree page header definition
+typedef struct {
+  uint8_t  flags;
+  uint16_t ncells;
+  pgsz_t   pldOffset;  // payload offset
+  /* TODO */
+} SBtPgHdr;
+
 static int btreeCreate(SBTree **pBt);
 static int btreeDestroy(SBTree *pBt);
 static int btreeCursorMoveToChild(SBtCursor *pBtCur, pgno_t pgno);
@@ -69,9 +77,10 @@ int btreeCursorClose(SBtCursor *pBtCur) {
 }
 
 int btreeCursorMoveTo(SBtCursor *pBtCur, int kLen, const void *pKey) {
-  SPage *pPage;
+  SPage *   pPage;
-  pgno_t childPgno;
+  SBtPgHdr *pBtPgHdr;
-  int    idx;
+  pgno_t    childPgno;
+  int       idx;
 
   // 1. Move the cursor to the root page
 

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

@@ -20,6 +20,18 @@
 extern "C" {
 #endif
 
+typedef struct __attribute__((__packed__)) {
+  char    hdrInfo[16];  // info string
+  pgsz_t  szPage;       // page size of current file
+  int32_t cno;          // commit number counter
+  pgno_t  freePgno;     // freelist page number
+  uint8_t resv[100];    // reserved space
+} SPgFileHdr;
+
+#define TDB_PG_FILE_HDR_SIZE 128
+
+TD_STATIC_ASSERT(sizeof(SPgFileHdr) == TDB_PG_FILE_HDR_SIZE, "Page file header size if not 128");
+
 struct SPgFile {
   char *    fname;                    // backend file name
   uint8_t   fileid[TDB_FILE_ID_LEN];  // file id

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

@@ -93,12 +93,16 @@ typedef TD_DLIST(SPgFile) SPgFileList;
     }                             \
   } while (0)
 
-#include "btree.h"
-#include "pgcache.h"
-#include "pgfile.h"
-#include "tdbEnv.h"
 #include "tdbUtil.h"
 
+#include "btree.h"
+
+#include "pgcache.h"
+
+#include "pgfile.h"
+
+#include "tdbEnv.h"
+
 #ifdef __cplusplus
 }
 #endif

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

@@ -20,6 +20,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 201112L
+#define TD_STATIC_ASSERT(op, info) static_assert(op, info)
+#else
+#define TD_STATIC_ASSERT(op, info)
+#endif
+
 #define TDB_ROUND8(x) (((x) + 7) & ~7)
 
 int tdbGnrtFileID(const char *fname, uint8_t *fileid, bool unique);