test/test_hash_key.cpp

Sun, 06 Nov 2022 16:07:32 +0100

author
Mike Becker <universe@uap-core.de>
date
Sun, 06 Nov 2022 16:07:32 +0100
changeset 604
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parent 603
c49104015a6b
permissions
-rw-r--r--

change hash functions

1) for zero-terminated strings, the terminator is no longer included in the hash
2) for NULL there is now a special hash value different from the hash for empty data

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "cx/hash_key.h"
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30
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31 #include <gtest/gtest.h>
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32
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33 TEST(cx_hash_key, functions) {
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34 auto str = "my key";
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35 auto len = strlen(str);
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36
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37 auto str_key = cx_hash_key_str(str);
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38 auto bytes_key = cx_hash_key_bytes(
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39 reinterpret_cast<unsigned char const *>(str), len);
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40 auto obj_key = cx_hash_key(
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41 reinterpret_cast<void const *>(str), len);
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42
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43 EXPECT_EQ(str_key.hash, bytes_key.hash);
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44 EXPECT_EQ(obj_key.hash, bytes_key.hash);
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45 EXPECT_EQ(str_key.len, len);
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46 EXPECT_EQ(bytes_key.len, len);
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47 EXPECT_EQ(bytes_key.len, len);
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48 EXPECT_EQ(str_key.data.cstr, str);
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49 EXPECT_EQ(bytes_key.data.cbytes, reinterpret_cast<unsigned char const *>(str));
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50 EXPECT_EQ(bytes_key.data.cobj, reinterpret_cast<void const *>(str));
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51 }
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52
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53 TEST(cx_hash_key, empty_string) {
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54 auto str = "";
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55
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56 auto str_key = cx_hash_key_str(str);
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57 auto bytes_key = cx_hash_key_bytes(
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58 reinterpret_cast<unsigned char const *>(str), 0);
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59 auto obj_key = cx_hash_key(
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60 reinterpret_cast<void const *>(str), 0);
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61
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62 EXPECT_EQ(bytes_key.hash, 4152238450u);
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63 EXPECT_EQ(str_key.hash, 4152238450u);
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64 EXPECT_EQ(obj_key.hash, 4152238450u);
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65 EXPECT_EQ(str_key.len, 0);
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66 EXPECT_EQ(bytes_key.len, 0);
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67 EXPECT_EQ(bytes_key.len, 0);
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68 EXPECT_EQ(str_key.data.cstr, str);
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69 EXPECT_EQ(bytes_key.data.cbytes, reinterpret_cast<unsigned char const *>(str));
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70 EXPECT_EQ(bytes_key.data.cobj, reinterpret_cast<void const *>(str));
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71 }
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72
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73 TEST(cx_hash_key, null_ptr) {
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74 auto str_key = cx_hash_key_str(nullptr);
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75 auto bytes_key = cx_hash_key_bytes(nullptr, 0);
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76 auto obj_key = cx_hash_key(nullptr, 0);
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77
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78 EXPECT_EQ(bytes_key.hash, 1574210520u);
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79 EXPECT_EQ(str_key.hash, 1574210520u);
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80 EXPECT_EQ(obj_key.hash, 1574210520u);
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81 EXPECT_EQ(str_key.len, 0);
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82 EXPECT_EQ(bytes_key.len, 0);
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83 EXPECT_EQ(bytes_key.len, 0);
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84 EXPECT_EQ(str_key.data.cstr, nullptr);
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85 EXPECT_EQ(bytes_key.data.cbytes, nullptr);
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86 EXPECT_EQ(bytes_key.data.cobj, nullptr);
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87 }

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