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);
}
public byte[] Dump()
{
ArrayList allbytes = new ArrayList();
int byteCount = 0;
for (int index = 0; index < this.keys.Count; index++)
{
string thisKey = (string)this.keys[index];
byte[] thisValue = (byte[])this.values[index];
byte[] keyprefix = new byte[BufferFile.INTSTORAGE];
byte[] keybytes = BplusTree.StringToBytes(thisKey);
BufferFile.Store(keybytes.Length, keyprefix, 0);
allbytes.Add(keyprefix);
allbytes.Add(keybytes);
byte[] valueprefix = new byte[BufferFile.INTSTORAGE];
BufferFile.Store(thisValue.Length, valueprefix, 0);
allbytes.Add(valueprefix);
allbytes.Add(thisValue);
}
foreach (object thing in allbytes)
{
byte[] thebytes = (byte[])thing;
byteCount += thebytes.Length;
}
int outindex = 0;
byte[] result = new byte[byteCount];
foreach (object thing in allbytes)
{
byte[] thebytes = (byte[])thing;
int thelength = thebytes.Length;
Array.Copy(thebytes, 0, result, outindex, thelength);
outindex += thelength;
}
if (outindex != byteCount)
{
throw new BplusTreeException("error counting bytes in dump " + outindex + "!=" + byteCount);
}
return(result);
}