/bloomfilter

This is a stand-alone bloomfilter implementation written in C. Simple but powerful

Primary LanguageC

BloomFilter_x64实现

仿照Cassandra中的BloomFilter实现,Hash选用MurmurHash2,通过双重散列公式生成散列函数

  Hash(key, i) = (H1(key) + i * H2(key)) % m

版本历史

BloomFilter使用例子

  static BaseBloomFilter stBloomFilter = {0};

  // 初始化BloomFilter(容纳100,000元素,假阳概率不超过万分之一):
  InitBloomFilter(&stBloomFilter, 0, 100000, 0.00001);
  // 重置BloomFilter:
  ResetBloomFilter(&stBloomFilter);
  // 释放BloomFilter:
  FreeBloomFilter(&stBloomFilter);

  // 向BloomFilter中新增一个数值(0-正常,1-加入数值过多):
  uint32_t dwValue;
  iRet = BloomFilter_Add(&stBloomFilter, &dwValue, sizeof(uint32_t));

  // 检查数值是否在BloomFilter内(0-存在,1-不存在):
  iRet = BloomFilter_Check(&stBloomFilter, &dwValue, sizeof(uint32_t));

  // (1.1新增) 将生成好的BloomFilter写入文件:
  iRet = SaveBloomFilterToFile(&stBloomFilter, "dump.bin")
  // (1.1新增) 从文件读取生成好的BloomFilter:
  iRet = LoadBloomFilterFromFile(&stBloomFilter, "dump.bin")