public static void GenBFFileFromFixedBlockOfOldFile(string oldFile, string bfFile)
{
var buff = new byte[BlockSize];
var fLength = 0;
using (var fs = new FileStream(oldFile, FileMode.Open, FileAccess.Read, FileShare.Read))
{
fLength = (int)fs.Length;
var nBlocks = fLength / BlockSize;
var m = nBlocks * BloomFilterRatio;
m += m % 8 == 0 ? 0 : 8 - (m % 8);
var hList = BloomFilter.DefaultHashFuncs();
var bf = new BloomFilter(m, hList);
var byteRead = 0;
for (var i = 0; i < nBlocks; ++i)
{
byteRead = fs.Read(buff, 0, BlockSize);
if (byteRead != BlockSize)
{
throw new InvalidDataException();
}
bf.Add(buff, 0, byteRead);
}
// Serialize bf.
using (var file = File.Create(bfFile))
{
Serializer.Serialize(file, bf);
}
}
}
static BloomFilter GenerateBF(List<int> values)
{
var n = values.Count;
var m = n * 12;
m += m % 8 == 0 ? 0 : 8 - (m % 8);
var hList = BloomFilter.DefaultHashFuncs();
var bf = new BloomFilter(m, hList);
foreach (var value in values)
{
var byteArr = BitConverter.GetBytes(value);
bf.Add(byteArr);
}
return bf;
}
