C Minimal Perfect Hashing Library - C 語言的哈希函數庫

C Minimal Perfect Hashing Library (CMPH) 是一個可移植的基于 LGPL 協議發布的 C 語言的哈希函數庫。該庫封裝了最新而且最高效的算法，易用，穩定、快速。

示例代碼：

  #include <cmph.h>
  #include <string.h>
  // Create minimal perfect hash function from in-memory vector
  int main(int argc, char **argv)
  { 

      // Creating a filled vector
      unsigned int i = 0;
      const char *vector[] = {"aaaaaaaaaa", "bbbbbbbbbb", "cccccccccc", "dddddddddd", "eeeeeeeeee", 
          "ffffffffff", "gggggggggg", "hhhhhhhhhh", "iiiiiiiiii", "jjjjjjjjjj"};
      unsigned int nkeys = 10;
      FILE* mphf_fd = fopen("temp.mph", "w");
      // Source of keys
      cmph_io_adapter_t *source = cmph_io_vector_adapter((char **)vector, nkeys);

      //Create minimal perfect hash function using the brz algorithm.
      cmph_config_t *config = cmph_config_new(source);
      cmph_config_set_algo(config, CMPH_BRZ);
      cmph_config_set_mphf_fd(config, mphf_fd);
      cmph_t *hash = cmph_new(config);
      cmph_config_destroy(config);
      cmph_dump(hash, mphf_fd); 
      cmph_destroy(hash);   
      fclose(mphf_fd);

      //Find key
      mphf_fd = fopen("temp.mph", "r");
      hash = cmph_load(mphf_fd);
      while (i < nkeys) {
          const char *key = vector[i];
          unsigned int id = cmph_search(hash, key, (cmph_uint32)strlen(key));
          fprintf(stderr, "key:%s -- hash:%u\n", key, id);
          i++;
      }

      //Destroy hash
      cmph_destroy(hash);
      cmph_io_vector_adapter_destroy(source);   
      fclose(mphf_fd);
      return 0;
  }

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