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- // Copyright 2014 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "butil/hash.h"
- #include <string>
- #include <vector>
- #include <gtest/gtest.h>
- namespace butil {
- TEST(HashTest, String) {
- std::string str;
- // Empty string (should hash to 0).
- str = "";
- EXPECT_EQ(0u, Hash(str));
- // Simple test.
- str = "hello world";
- EXPECT_EQ(2794219650u, Hash(str));
- // Change one bit.
- str = "helmo world";
- EXPECT_EQ(1006697176u, Hash(str));
- // Insert a null byte.
- str = "hello world";
- str[5] = '\0';
- EXPECT_EQ(2319902537u, Hash(str));
- // Test that the bytes after the null contribute to the hash.
- str = "hello worle";
- str[5] = '\0';
- EXPECT_EQ(553904462u, Hash(str));
- // Extremely long string.
- // Also tests strings with high bit set, and null byte.
- std::vector<char> long_string_buffer;
- for (int i = 0; i < 4096; ++i)
- long_string_buffer.push_back((i % 256) - 128);
- str.assign(&long_string_buffer.front(), long_string_buffer.size());
- EXPECT_EQ(2797962408u, Hash(str));
- // All possible lengths (mod 4). Tests separate code paths. Also test with
- // final byte high bit set (regression test for http://crbug.com/90659).
- // Note that the 1 and 3 cases have a weird bug where the final byte is
- // treated as a signed char. It was decided on the above bug discussion to
- // enshrine that behaviour as "correct" to avoid invalidating existing hashes.
- // Length mod 4 == 0.
- str = "hello w\xab";
- EXPECT_EQ(615571198u, Hash(str));
- // Length mod 4 == 1.
- str = "hello wo\xab";
- EXPECT_EQ(623474296u, Hash(str));
- // Length mod 4 == 2.
- str = "hello wor\xab";
- EXPECT_EQ(4278562408u, Hash(str));
- // Length mod 4 == 3.
- str = "hello worl\xab";
- EXPECT_EQ(3224633008u, Hash(str));
- }
- TEST(HashTest, CString) {
- const char* str;
- // Empty string (should hash to 0).
- str = "";
- EXPECT_EQ(0u, Hash(str, strlen(str)));
- // Simple test.
- str = "hello world";
- EXPECT_EQ(2794219650u, Hash(str, strlen(str)));
- // Ensure that it stops reading after the given length, and does not expect a
- // null byte.
- str = "hello world; don't read this part";
- EXPECT_EQ(2794219650u, Hash(str, strlen("hello world")));
- }
- } // namespace butil
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