public Page <T> LoadPageFromPageNumber(int number) { lock (_fileLock) { SeekPage(number); byte[] b = new byte[_PageLength]; _file.Read(b, 0, _PageLength); if (b[0] == _BlockHeader[0] && b[1] == _BlockHeader[1] && b[2] == _BlockHeader[2] && b[3] == _BlockHeader[3]) { // create node here Page <T> page = new Page <T>(); short count = Helper.ToInt16(b, 5); if (count > _PageNodeCount) { throw new Exception("Count > node size"); } page.DiskPageNumber = number; page.RightPageNumber = Helper.ToInt32(b, 11); int index = _BlockHeader.Length; object[] keys = null; for (int i = 0; i < count; i++) { int idx = index + _rowSize * i; byte ks = b[idx]; T key; if (_externalStrings == false) { key = _T.GetObject(b, idx + 1, ks); } else { if (keys == null) { int blknum = Helper.ToInt32(b, idx + 1, false); byte[] bb = _strings.GetData(blknum, out page.allocblocks); keys = (object[])BJSON.ToObject(bb); } key = (T)keys[i]; } int offset = Helper.ToInt32(b, idx + 1 + _maxKeySize); int duppage = Helper.ToInt32(b, idx + 1 + _maxKeySize + 4); page.tree.Add(key, new KeyInfo(offset, duppage)); } return(page); } else { throw new Exception("Page read error header invalid, number = " + number); } } }
private int LoadPageListData(int page, SafeSortedList <T, PageInfo> PageList) { lock (_fileLock) { // load page list data int nextpage = -1; SeekPage(page); byte[] b = new byte[_PageLength]; _file.Read(b, 0, _PageLength); if (b[0] == _BlockHeader[0] && b[1] == _BlockHeader[1] && b[2] == _BlockHeader[2] && b[3] == _BlockHeader[3]) { short count = Helper.ToInt16(b, 5); if (count > _PageNodeCount) { throw new Exception("Count > node size"); } nextpage = Helper.ToInt32(b, 11); int index = _BlockHeader.Length; object[] keys = null; if (File.Exists(_FileName + ".pagelist")) { var bn = File.ReadAllBytes(_FileName + ".pagelist"); int blknum = Helper.ToInt32(bn, 0); byte[] bb = _strings.GetData(blknum, _pagelistalllocblock); keys = (object[])fastBinaryJSON.BJSON.ToObject(bb); } for (int i = 0; i < count; i++) { int idx = index + _rowSize * i; byte ks = b[idx]; T key; if (_externalStrings == false) { key = _T.GetObject(b, idx + 1, ks); } else { if (keys == null) { key = _T.GetObject(b, idx + 1, ks); // do old way until better way } else { key = (T)keys[i]; } } int pagenum = Helper.ToInt32(b, idx + 1 + _maxKeySize); // add counts int unique = Helper.ToInt32(b, idx + 1 + _maxKeySize + 4); // FEATURE : add dup count PageList.Add(key, new PageInfo(pagenum, unique, 0)); } } else { throw new Exception("Page List header is invalid"); } return(nextpage); } }