public void ReadData <T> (ref BTreeValue entry, Deserializer <T> deserializer, out T value)
{
var keyType = entry.KeyType;
if (keyType == 0)
{
throw new InvalidDataException();
fixed(BTreeValue *pEntry = &entry)
ReadData(pEntry, keyType, deserializer, out value);
}
public void WriteKey(ref BTreeValue btreeValue, TangleKey key)
{
var prefixSize = Math.Min(key.Data.Count, BTreeValue.KeyPrefixSize);
fixed(byte *pPrefix = btreeValue.KeyPrefix)
Unsafe.WriteBytes(pPrefix, 0, key.Data.Array, key.Data.Offset, prefixSize);
if (prefixSize < key.Data.Count)
{
using (var keyRange = KeyStream.AccessRange(btreeValue.KeyOffset, btreeValue.KeyLength, MemoryMappedFileAccess.Write))
Unsafe.WriteBytes(keyRange.Pointer, 0, key.Data);
}
}
/// <summary>
/// Inserts a new value and leaf into the specified BTree node at the specified position. Existing value(s) and leaves are moved.
/// </summary>
/// <param name="nodeIndex">The index of the node to insert into.</param>
/// <param name="valueIndex">The index of the value to move forward.</param>
/// <param name="value">The BTreeValue containing information on the value. It must be fully filled in.</param>
/// <param name="leaf">The leaf associated with the new value.</param>
private void Insert(long nodeIndex, uint valueIndex, ref BTreeValue value, ref BTreeLeaf leaf)
{
using (var range = PrepareForInsert(nodeIndex, valueIndex)) {
var pNode = (BTreeNode *)range.Pointer;
var pValues = (BTreeValue *)(range.Pointer + BTreeNode.OffsetOfValues);
var pLeaves = (BTreeLeaf *)(range.Pointer + BTreeNode.OffsetOfLeaves);
pValues[valueIndex] = value;
pLeaves[valueIndex + 1] = leaf;
UnlockNode(range);
}
}
// BTreeValue must be fully prepared for the write operation:
// KeyOffset/KeyLength must be filled in.
// DataOffset/DataLength must be filled in.
// The BTreeValue's IsValid must be 0.
// newOffset must specify the offset within the data stream where the data is to be written.
// In most cases this should be equal to DataOffset, but in the case of AppendData it will be different.
private void WriteData(ref BTreeValue btreeValue, ArraySegment <byte> data, bool append, long?dataOffset, uint size)
{
if (btreeValue.KeyType != 0)
throw new InvalidDataException(); }