text: /*
   *
   * Copyright 2015 gRPC authors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  #include "src/core/lib/gpr/murmur_hash.h"
  
  #include <string.h>
  
  #include <grpc/support/log.h>
  #include <grpc/support/string_util.h>
  
  #include "test/core/util/test_config.h"
  
  typedef uint32_t (*hash_func)(const void* key, size_t len, uint32_t seed);
  
  /* From smhasher:
     This should hopefully be a thorough and uambiguous test of whether a hash
     is correctly implemented on a given platform */
  
  static void verification_test(hash_func hash, uint32_t expected) {
    uint8_t key[256];
    uint32_t hashes[256];
    uint32_t final = 0;
    size_t i;
  
    memset(key, 0, sizeof(key));
    memset(hashes, 0, sizeof(hashes));
  
    /* Hash keys of the form {0}, {0,1}, {0,1,2}... up to N=255,using 256-N as
       the seed */
  
    for (i = 0; i < 256; i++) {
      key[i] = static_cast<uint8_t>(i);
      hashes[i] = hash(key, i, static_cast<uint32_t>(256u - i));
    }
  
    /* Then hash the result array */
  
    final = hash(hashes, sizeof(hashes), 0);
  
    /* The first four bytes of that hash, interpreted as a little-endian integer,
       is our
       verification value */
  
    if (expected != final) {
      gpr_log(GPR_INFO, "Verification value 0x%08X : Failed! (Expected 0x%08x)",
              final, expected);
      abort();
    } else {
      gpr_log(GPR_INFO, "Verification value 0x%08X : Passed!", final);
    }
  }
  
  int main(int argc, char** argv) {
    grpc::testing::TestEnvironment env(&argc, argv);
    /* basic tests to verify that things don't crash */
    gpr_murmur_hash3("", 0, 0);
    gpr_murmur_hash3("xyz", 3, 0);
    verification_test(gpr_murmur_hash3, 0xB0F57EE3);
    return 0;
  }
  