public void LoadEntries()
{
SpanReader sr = new SpanReader(_buffer, Endian.Big);
sr.Position = (int)_offsetStart;
uint offsetAndCount = sr.ReadUInt32();
uint nodeCount = sr.ReadUInt16();
for (int i = 0; i < nodeCount; i++)
{
uint keyCount = GetBitsAt(ref sr, 0) & 0x7FFu;
uint nextOffset = GetBitsAt(ref sr, keyCount + 1);
for (uint j = 0; j < keyCount; j++)
{
uint offset = GetBitsAt(ref sr, j + 1);
var data = sr.GetReaderAtOffset((int)offset);
TKey key = new TKey();
key.Deserialize(ref data);
Entries.Add(key);
}
sr.Position += (int)nextOffset;
}
}
public void TraverseAndUnpack(EntryUnpacker unpacker)
{
SpanReader sr = new SpanReader(_buffer, Endian.Big);
sr.Position += _offsetStart;
uint offsetAndCount = sr.ReadUInt32();
uint nodeCount = sr.ReadUInt16();
for (int i = 0; i < nodeCount; i++)
{
uint high = CryptoUtils.GetBitsAt(ref sr, 0) & 0x7FFu;
uint nextOffset = CryptoUtils.GetBitsAt(ref sr, high + 1);
for (uint j = 0; j < high; j++) // high is pretty much entry count
{
uint offset = CryptoUtils.GetBitsAt(ref sr, j + 1);
var data = sr.GetReaderAtOffset((int)offset);
FileEntryKey key = new FileEntryKey();
key.OffsetFromTree = data.Position;
key.Deserialize(ref data);
unpacker.UnpackFromKey(key);
}
sr.Position += (int)nextOffset;
}
}
public SpanReader SearchWithComparison(ref SpanReader sr, uint count, TKey key, SearchResult res, SearchCompareMethod method)
{
uint high = GetBitsAt(ref sr, 0) & 0x7FFu;
uint low = 0;
uint index = 0;
res.upperBound = high;
SpanReader subData = default;
while (low < high)
{
uint mid = low + (high - low) / 2;
index = mid + 1;
uint offset = GetBitsAt(ref sr, index);
subData = sr.GetReaderAtOffset((int)offset);
int ret;
if (method == SearchCompareMethod.LessThan)
{
ret = LessThanKeyCompareOp(key, ref subData);
}
else if (method == SearchCompareMethod.EqualTo)
{
ret = EqualToKeyCompareOp(key, ref subData);
}
else
{
throw new ArgumentException($"Invalid search method provided '{method}'");
}
if (ret == 0)
{
res.lowerBound = mid;
res.index = mid;
return(subData);
}
else if (ret > 0)
{
low = index;
}
else if (ret < 0)
{
high = mid;
index = mid;
}
}
subData.Position = -1;
res.lowerBound = index;
res.index = ~0u;
if (count != 0 && index != res.upperBound)
{
uint offset = GetBitsAt(ref sr, index + 1);
subData = sr.GetReaderAtOffset((int)offset);
}
return(subData);
}
