wp

atree/atree.go

@@ -22,21 +22,27 @@ const (
 	pageTypeIdx = PageSize - 5
 
 	// index page
-	indexRecordsQtyIdx   = PageSize - 8
-	isDataPageNumbersIdx = PageSize - 6
+	indexCRC32Idx      = IndexPageSize - 4
+	isLastLevelIdx     = IndexPageSize - 5
+	indexRecordsQtyIdx = IndexPageSize - 7
+
+	indexRecordSize = 8
 
 	// data page
-	timestampsSizeIdx = PageSize - 13
-	valuesSizeIdx     = PageSize - 11
-	prevPageIdx       = PageSize - 9
+	dataCRC32Idx      = DataPageSize - 4
+	prevPageIdx       = DataPageSize - 8
+	valuesSizeIdx     = DataPageSize - 10
+	timestampsSizeIdx = DataPageSize - 12
 
 	timestampSize  = 4
 	pairSize       = timestampSize + PageNoSize
 	indexFooterIdx = indexRecordsQtyIdx
 	dataFooterIdx  = timestampsSizeIdx
 
-	PageSize   = 8192
-	PageNoSize = 4
+	PageSize      = 8192
+	DataPageSize  = 8192
+	IndexPageSize = 1024
+	PageNoSize    = 4
 	//
 	DataPagePayloadSize int = dataFooterIdx
 )
@@ -161,7 +167,7 @@ func (s *Atree) findDataPage(rootPageNo uint32, timestamp uint32) (uint32, []byt
 		s.releasePage(indexPageNo)
 
 		// fix
-		if buf[isDataPageNumbersIdx] == 1 {
+		if buf[isLastLevelIdx] == 1 {
 			buf, err := s.fetchDataPage(foundPageNo)
 			if err != nil {
 				return 0, nil, fmt.Errorf("fetchDataPage(%d): %s", foundPageNo, err)
@@ -206,7 +212,7 @@ func (s *Atree) FindPathToLastPage(rootPageNo uint32) (_ PathToDataPage, err err
 		foundPageNo := getLastPageNo(buf)
 
 		// fix
-		if buf[isDataPageNumbersIdx] == 1 {
+		if buf[isLastLevelIdx] == 1 {
 			return PathToDataPage{
 				Legs:       legs,
 				LastPageNo: foundPageNo,