зеркало из https://github.com/mozilla/gecko-dev.git
103 строки
3.0 KiB
C++
103 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Assertions.h"
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#include "mozilla/BloomFilter.h"
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#include <stddef.h>
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#include <stdio.h>
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using mozilla::BloomFilter;
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class FilterChecker
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{
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public:
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FilterChecker(uint32_t hash) : mHash(hash) { }
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uint32_t hash() const { return mHash; }
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private:
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uint32_t mHash;
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};
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int
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main()
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{
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BloomFilter<12, FilterChecker> *filter = new BloomFilter<12, FilterChecker>();
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MOZ_ASSERT(filter);
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FilterChecker one(1);
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FilterChecker two(0x20000);
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FilterChecker many(0x10000);
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FilterChecker multiple(0x20001);
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filter->add(&one);
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MOZ_ASSERT(filter->mightContain(&one),
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"Filter should contain 'one'");
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MOZ_ASSERT(!filter->mightContain(&multiple),
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"Filter claims to contain 'multiple' when it should not");
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MOZ_ASSERT(filter->mightContain(&many),
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"Filter should contain 'many' (false positive)");
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filter->add(&two);
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MOZ_ASSERT(filter->mightContain(&multiple),
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"Filter should contain 'multiple' (false positive)");
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// Test basic removals
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filter->remove(&two);
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MOZ_ASSERT(!filter->mightContain(&multiple),
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"Filter claims to contain 'multiple' when it should not after two "
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"was removed");
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// Test multiple addition/removal
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const size_t FILTER_SIZE = 255;
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for (size_t i = 0; i < FILTER_SIZE - 1; ++i)
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filter->add(&two);
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MOZ_ASSERT(filter->mightContain(&multiple),
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"Filter should contain 'multiple' after 'two' added lots of times "
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"(false positive)");
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for (size_t i = 0; i < FILTER_SIZE - 1; ++i)
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filter->remove(&two);
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MOZ_ASSERT(!filter->mightContain(&multiple),
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"Filter claims to contain 'multiple' when it should not after two "
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"was removed lots of times");
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// Test overflowing the filter buckets
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for (size_t i = 0; i < FILTER_SIZE + 1; ++i)
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filter->add(&two);
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MOZ_ASSERT(filter->mightContain(&multiple),
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"Filter should contain 'multiple' after 'two' added lots more "
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"times (false positive)");
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for (size_t i = 0; i < FILTER_SIZE + 1; ++i)
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filter->remove(&two);
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MOZ_ASSERT(filter->mightContain(&multiple),
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"Filter claims to not contain 'multiple' even though we should "
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"have run out of space in the buckets (false positive)");
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MOZ_ASSERT(filter->mightContain(&two),
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"Filter claims to not contain 'two' even though we should have "
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"run out of space in the buckets (false positive)");
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filter->remove(&one);
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MOZ_ASSERT(!filter->mightContain(&one),
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"Filter should not contain 'one', because we didn't overflow its "
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"bucket");
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filter->clear();
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MOZ_ASSERT(!filter->mightContain(&multiple),
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"clear() failed to work");
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return 0;
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}
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