eae55c1be8
There were two places where we were doing unaligned reads: one when computing the hash for the material identifier, and one when parsing the chunk in ShaderReplacer. We also had a potential overflow since civetweb does not add a trailing null to incoming WebSockets messages.
53 lines
2.0 KiB
C++
53 lines
2.0 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <gtest/gtest.h>
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#include <utils/Hash.h>
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using namespace utils;
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TEST(HashTest, murmur) {
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const uint32_t seed = 1701;
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const uint32_t words[3] = { 0x12345678, 0x00c0ffee, 0xbadf000d};
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const uint32_t result1 = hash::murmur3(words, 1, seed);
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const uint32_t result2 = hash::murmur3(words, 3, seed);
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const uint32_t result3 = hash::murmur3(&words[2], 1, seed);
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EXPECT_NE(result1, result2);
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EXPECT_NE(result2, result3);
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// Ensure that the byte-based hash function gives consistent results,
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// regardless of alignment and surrounding bytes.
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const uint8_t bytes_a0[] = { 0x78, 0x56, 0x34, 0x12, 0xff, 0xaa, 0xbb };
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const uint8_t bytes_a1[] = { 0xcc, 0x78, 0x56, 0x34, 0x12, 0xdd, 0xee };
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const uint8_t bytes_a2[] = { 0xff, 0xaa, 0x78, 0x56, 0x34, 0x12, 0xbb };
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const uint8_t bytes_a3[] = { 0xcc, 0xdd, 0xee, 0x78, 0x56, 0x34, 0x12 };
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const uint32_t result4 = hash::murmurSlow(&bytes_a0[0], 4, seed);
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const uint32_t result5 = hash::murmurSlow(&bytes_a1[1], 4, seed);
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const uint32_t result6 = hash::murmurSlow(&bytes_a2[2], 4, seed);
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const uint32_t result7 = hash::murmurSlow(&bytes_a3[3], 4, seed);
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const uint32_t result8 = hash::murmurSlow(&bytes_a0[0], 5, seed);
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EXPECT_EQ(result1, result4); // <== passes only on little endian machines.
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EXPECT_EQ(result4, result5);
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EXPECT_EQ(result4, result6);
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EXPECT_EQ(result4, result7);
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EXPECT_NE(result4, result8);
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}
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