public long Deserialize(byte[] buffer, int offset, int length)
{
if (length != 8)
{
throw new ArgumentException("Invalid length: " + length);
}
return(BufferHelper.ReadBufferInt64(buffer, offset));
}
byte[] FixedLengthSerialize(TreeNode <K, V> node)
{
var entrySize = this.keySerializer.Length + this.valueSerializer.Length;
var size = 16
+ node.Entries.Length * entrySize
+ node.ChildrenIds.Length * 4;
if (size >= (1024 * 64))
{
throw new Exception("Serialized node size too large: " + size);
}
var buffer = new byte[size];
// First 4 bytes of the buffer is parent id of this node
BufferHelper.WriteBuffer(node.ParentId, buffer, 0);
// Followed by 4 bytes of how many entries
BufferHelper.WriteBuffer((uint)node.EntriesCount, buffer, 4);
// Followed by 4 bytes of how manu child references
BufferHelper.WriteBuffer((uint)node.ChildrenNodeCount, buffer, 8);
// Start writing entries && child refs
for (var i = 0; i < node.EntriesCount; i++)
{
// Write entry
var entry = node.GetEntry(i);
Buffer.BlockCopy(this.keySerializer.Serialize(entry.Item1), 0, buffer, 12 + i * entrySize, this.keySerializer.Length);
Buffer.BlockCopy(this.valueSerializer.Serialize(entry.Item2), 0, buffer, 12 + i * entrySize + this.keySerializer.Length, this.valueSerializer.Length);
}
// Start writing child references
var childrenIds = node.ChildrenIds;
for (var i = 0; i < node.ChildrenNodeCount; i++)
{
// Write child refs
BufferHelper.WriteBuffer(childrenIds[i], buffer, 12 + entrySize * node.EntriesCount + (i * 4));
}
// Return generated buffer
return(buffer);
}
TreeNode <K, V> VariableKeyLengthDeserialize(uint assignId, byte[] buffer)
{
// First 4 bytes uint32 is parent id
var parentId = BufferHelper.ReadBufferUInt32(buffer, 0);
// Followed by 4 bytes uint32 of by how many entries this node has
var entriesCount = BufferHelper.ReadBufferUInt32(buffer, 4);
// Followed by 4 bytes uint32 of how many child reference this node has
var childrenCount = BufferHelper.ReadBufferUInt32(buffer, 8);
// Deserialize entries
var entries = new Tuple <K, V> [entriesCount];
var p = 12;
for (var i = 0; i < entriesCount; i++)
{
var keyLength = BufferHelper.ReadBufferInt32(buffer, p);
var key = this.keySerializer.Deserialize(buffer
, p + 4
, keyLength);
var value = this.valueSerializer.Deserialize(buffer
, p + 4 + keyLength
, this.valueSerializer.Length);
entries[i] = new Tuple <K, V>(key, value);
p += 4 + keyLength + valueSerializer.Length;
}
// Decode child refs..
var children = new uint[childrenCount];
for (var i = 0; i < childrenCount; i++)
{
// Decode child refs..
children[i] = BufferHelper.ReadBufferUInt32(buffer, (int)(p + (i * 4)));
}
// Reconstuct the node
return(new TreeNode <K, V>(nodeManager, assignId, parentId, entries, children));
}
public void SetHeader(int field, long value)
{
if (isDisposed)
{
throw new ObjectDisposedException("Block");
}
if (field < 0)
{
throw new IndexOutOfRangeException();
}
// Update cache if this field is cached
if (field < cachedHeaderValue.Length)
{
cachedHeaderValue[field] = value;
}
// Write in cached buffer
BufferHelper.WriteBuffer((long)value, firstSector, field * 8);
isFirstSectorDirty = true;
}