private unsafe static void SetBlockHeader(int length, DeltaLogEntryType type, byte *dest)
{
ref var header = ref GetHeader((long)dest);
/// <summary>
/// Get next entry
/// </summary>
/// <param name="physicalAddress"></param>
/// <param name="entryLength"></param>
/// <param name="type"></param>
/// <returns></returns>
public unsafe bool GetNext(out long physicalAddress, out int entryLength, out DeltaLogEntryType type)
{
while (true)
{
physicalAddress = 0;
entryLength = 0;
currentAddress = nextAddress;
type = DeltaLogEntryType.DELTA;
var _currentPage = currentAddress >> LogPageSizeBits;
var _currentFrame = _currentPage % frameSize;
var _currentOffset = currentAddress & PageSizeMask;
var _headAddress = long.MaxValue;
if (disposed)
{
return(false);
}
var _endAddress = endAddress;
if (tailAddress > _endAddress)
{
_endAddress = tailAddress;
}
if (currentAddress >= _endAddress)
{
return(false);
}
if (BufferAndLoad(currentAddress, _currentPage, _currentFrame, _headAddress, _endAddress))
{
continue;
}
physicalAddress = frame.GetPhysicalAddress(_currentFrame, _currentOffset);
// Get and check entry length
entryLength = GetHeader(physicalAddress).Length;
type = GetHeader(physicalAddress).Type;
if (entryLength == 0)
{
currentAddress = (1 + (currentAddress >> LogPageSizeBits)) << LogPageSizeBits;
if (Utility.MonotonicUpdate(ref nextAddress, currentAddress, out _))
{
return(false);
}
else
{
continue;
}
}
int recordSize = (int)(Align(_currentOffset + HeaderSize + entryLength) - _currentOffset);
if (entryLength < 0 || (_currentOffset + recordSize > PageSize))
{
currentAddress = (1 + (currentAddress >> LogPageSizeBits)) << LogPageSizeBits;
if (Utility.MonotonicUpdate(ref nextAddress, currentAddress, out _))
{
return(false);
}
else
{
continue;
}
}
// Verify checksum
if (!VerifyBlockChecksum((byte *)physicalAddress, entryLength))
{
currentAddress = (1 + (currentAddress >> LogPageSizeBits)) << LogPageSizeBits;
if (Utility.MonotonicUpdate(ref nextAddress, currentAddress, out _))
{
return(false);
}
else
{
continue;
}
}
physicalAddress += HeaderSize;
if ((currentAddress & PageSizeMask) + recordSize == PageSize)
{
currentAddress = (1 + (currentAddress >> LogPageSizeBits)) << LogPageSizeBits;
}
else
{
currentAddress += recordSize;
}
if (Utility.MonotonicUpdate(ref nextAddress, currentAddress, out long oldCurrentAddress))
{
currentAddress = oldCurrentAddress;
return(true);
}
}
}
