public void Load(byte[] serialization)
{
int index = 0;
int byteCount = serialization.Length;
if (this.values.Count != 0 || this.keys.Count != 0)
{
throw new BplusTreeException("load into nonempty xBucket not permitted");
}
while (index < byteCount)
{
// get key prefix and key
int keylength = BufferFile.Retrieve(serialization, index);
index += BufferFile.INTSTORAGE;
byte[] keybytes = new byte[keylength];
Array.Copy(serialization, index, keybytes, 0, keylength);
string keystring = BplusTree.BytesToString(keybytes);
index += keylength;
// get value prefix and value
int valuelength = BufferFile.Retrieve(serialization, index);
index += BufferFile.INTSTORAGE;
byte[] valuebytes = new byte[valuelength];
Array.Copy(serialization, index, valuebytes, 0, valuelength);
// record new key and value
this.keys.Add(keystring);
this.values.Add(valuebytes);
index += valuelength;
}
if (index != byteCount)
{
throw new BplusTreeException("bad byte count in serialization " + byteCount);
}
}
public override string PrefixForByteCount(string s, int maxbytecount)
{
byte[] inputbytes = BplusTree.StringToBytes(s);
System.Security.Cryptography.MD5 D = System.Security.Cryptography.MD5.Create();
byte[] digest = D.ComputeHash(inputbytes);
byte[] resultbytes = new byte[maxbytecount];
// copy digest translating to printable ascii
for (int i = 0; i < maxbytecount; i++)
{
int r = digest[i % digest.Length];
if (r > 127)
{
r = 256 - r;
}
if (r < 0)
{
r = -r;
}
//Console.WriteLine(" before "+i+" "+r);
r = r % 79 + 40; // printable ascii
//Console.WriteLine(" "+i+" "+r);
resultbytes[i] = (byte)r;
}
string result = BplusTree.BytesToString(resultbytes);
return(result);
}
