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/*
*
* 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 <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "test/core/util/test_config.h"
#include <string.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;
}
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