public LeafReader(SBBF03 sb, BTreeLeaf leaf)
{
File = sb;
Leaf = leaf;
Offset = 0;
Visited = new List <int>(new[] { leaf.Index });
}
public override void Read(SBBF03 sbb, int blockIndex)
{
base.Read(sbb, blockIndex);
if (!(sbb is BTreeDb4))
{
throw new Exception("Expected BTreeDb4!");
}
Keys = new List <Key>();
Values = new List <int>();
BTreeDb4 db = (BTreeDb4)sbb;
var unpacked = DataConverter.Unpack("^Cii", db.Reader.ReadBytes(9), 0);
Level = (byte)(char)unpacked[0];
NumKeys = (int)unpacked[1];
LeftBlock = (int)unpacked[2];
Values.Add(LeftBlock);
for (int i = 0; i < NumKeys; i++)
{
Key key = sbb.Reader.ReadBytes(db.KeySize);
var unpacked2 = DataConverter.Unpack("^i", db.Reader.ReadBytes(4), 0);
int block = (int)unpacked2[0];
Keys.Add(key);
Values.Add(block);
}
}
public static byte[] GetBlockSignature(SBBF03 sbb)
{
byte[] signature = new byte[2];
sbb.Reader.Read(signature, 0, signature.Length);
sbb.Reader.BaseStream.Seek(-signature.Length, SeekOrigin.Current);
return(signature);
}
public override void Read(SBBF03 sb, int blockIndex)
{
byte[] data = FreeBlock.RawData.Take(FreeBlock.RawData.Length - 4).ToArray();
var unpacked = DataConverter.Unpack("^i", data.Skip(data.Length - 4).ToArray(), 0);
int value = (int)unpacked[0];
NextBlock = value != -1 ? (int?)value : null;
}
public override void Read(SBBF03 sb, int blockIndex)
{
base.Read(sb, blockIndex);
RawData = sb.Reader.ReadBytes(sb.BlockSize - 2);
var unpacked = DataConverter.Unpack("^i", RawData.Take(4).ToArray(), 0);
Value = (int)unpacked[0];
NextFreeBlock = Value != -1 ? Value : 0;
}
public override void Read(SBBF03 sb, int blockIndex)
{
base.Read(sb, blockIndex);
Data = sb.Reader.ReadBytes(sb.BlockSize - 6);
var unpacked = DataConverter.Unpack("^i", sb.Reader.ReadBytes(4), 0);
int value = (int)unpacked[0];
NextBlock = value != -1 ? value : 0;
}
public virtual void Read(SBBF03 sbb, int blockIndex)
{
byte[] signature = GetBlockSignature(sbb);
sbb.Reader.BaseStream.Seek(signature.Length, SeekOrigin.Current);
if (signature[0] == '\x00' && signature[1] == '\x00')
{
throw new Exception();
}
if (!Signature.SequenceEqual(signature))
{
throw new Exception("Signatures don't match!");
}
Index = blockIndex;
}
