internal T GetKey(int recnum, out bool deleted)
{
lock (_lock)
{
deleted = false;
long off = recnum * 8L;
var b = new byte[8];
_recfileread.Seek(off, SeekOrigin.Begin);
_recfileread.Read(b, 0, 8);
off = Helper.ToInt64(b, 0);
// seek offset in file
var hdr = new byte[_rowheader.Length];
_dataread.Seek(off, System.IO.SeekOrigin.Begin);
// read header
_dataread.Read(hdr, 0, _rowheader.Length);
if (CheckHeader(hdr))
{
deleted = IsDeleted(hdr);
byte kl = hdr[3];
var kbyte = new byte[kl];
_dataread.Read(kbyte, 0, kl);
return(_T.GetObject(kbyte, 0, kl));
}
return(default(T));
}
}
public IEnumerable <KeyValuePair <T, byte[]> > Traverse()
{
long offset = 0;
offset = _fileheader.Length;
while (offset < _writefile.Length)
{
long pointer = offset;
byte[] key;
bool deleted = false;
offset = NextOffset(offset, out key, out deleted);
KeyValuePair <T, byte[]> kv = new KeyValuePair <T, byte[]>(_T.GetObject(key, 0, key.Length), internalReadData(pointer));
if (deleted == false)
{
yield return(kv);
}
}
}
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;
for (int i = 0; i < count; i++)
{
int idx = index + _rowSize * i;
byte ks = b[idx];
T key = _T.GetObject(b, idx + 1, ks);
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);
}
}
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;
// TODO : needed??
//if (File.Exists(_FileName + ".pagelist"))
//{
// var bn = File.ReadAllBytes(_FileName + ".pagelist");
// int blknum = Helper.ToInt32(bn, 0);
// byte[] bb = _strings.GetData(blknum, out _pagelistalllocblock);
// keys = (object[])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);
}
}
