public Value *TryAppend(USlice buffer)
{
Contract.Requires(buffer.Data != null &&
buffer.Count >= Value.SizeOf &&
((Key *)buffer.Data)->Size == buffer.Count - Value.SizeOf);
var entry = (Value *)TryAllocate(buffer.Count);
if (entry == null)
{
return(null); // the page is full
}
UnmanagedHelpers.CopyUnsafe((byte *)entry, buffer.Data, buffer.Count);
return(entry);
}
public Key *TryAppend(USlice buffer)
{
Contract.Requires(buffer.Data != null &&
buffer.Count >= Key.SizeOf &&
((Key *)buffer.Data)->Size == buffer.Count - Key.SizeOf);
var entry = (Key *)TryAllocate(buffer.Count);
if (entry == null)
{
return(null); // this page is full
}
UnmanagedHelpers.CopyUnsafe((byte *)entry, buffer.Data, buffer.Count);
entry->Header = ((ushort)EntryType.Key) << Entry.TYPE_SHIFT;
return(entry);
}
public unsafe void Add(ulong sequence, USlice userKey, USlice userValue)
{
// allocate the key
var tmp = MemoryDatabaseHandler.PackUserKey(m_scratch, userKey);
Key *key = m_keys.Append(tmp);
Contract.Assert(key != null, "key == null");
// allocate the value
uint size = userValue.Count;
Value *value = m_values.Allocate(size, sequence, null, key);
Contract.Assert(value != null, "value == null");
UnmanagedHelpers.CopyUnsafe(&(value->Data), userValue);
key->Values = value;
m_list.Add(new IntPtr(key));
}