| public AllocateSpace ( uint size ) : long? | ||
| size | uint | The number of bytes to allocate. |
| return | long? | |
private long CreateNode()
{
long offset = IndexStream.AllocateSpace(BTreeNode.TotalSize).Value;
var newIndex = (offset - BTreeHeader.Size) / BTreeNode.TotalSize;
return(newIndex);
}
private long?AllocateDataSpace(ref uint size)
{
if (EnableFreelist)
{
if (size < FreelistNode.Size)
{
size = FreelistNode.Size;
}
}
size = ((size + 3) / 4) * 4;
var result = FreelistTake(ref size);
if (!result.HasValue)
{
result = DataStream.AllocateSpace(size);
}
return(result);
}
public void WriteNewKey(BTreeValue *pEntry, TangleKey key)
{
if (key.Data.Count > BTreeValue.KeyPrefixSize)
{
pEntry->KeyOffset = (uint)KeyStream.AllocateSpace((uint)key.Data.Count).Value;
}
else
{
pEntry->KeyOffset = 0;
}
pEntry->KeyLength = (ushort)key.Data.Count;
// It's important that we zero out these fields so that when we write the data,
// it's done in append mode instead of replace mode
pEntry->DataOffset = 0;
pEntry->DataLength = 0;
pEntry->ExtraDataBytes = 0;
WriteKey(ref *pEntry, key);
}