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transmission/tests/libtransmission/bitfield-test.cc

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// This file Copyright (C) 2010-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <algorithm>
#include <array>
#include <limits>
#include <vector>
#include "transmission.h"
#include "crypto-utils.h"
#include "bitfield.h"
#include "utils.h" /* tr_free */
#include "gtest/gtest.h"
TEST(Bitfield, count)
{
auto constexpr IterCount = int{ 10000 };
for (auto i = 0; i < IterCount; ++i)
{
int const bit_count = 100 + tr_rand_int_weak(1000);
// generate a random bitfield
tr_bitfield bf(bit_count);
for (int j = 0, n = tr_rand_int_weak(bit_count); j < n; ++j)
{
bf.set(tr_rand_int_weak(bit_count));
}
int begin = tr_rand_int_weak(bit_count);
int end;
do
{
end = tr_rand_int_weak(bit_count);
} while (end == begin);
// ensure end <= begin
if (end < begin)
{
int const tmp = begin;
begin = end;
end = tmp;
}
// test the bitfield
unsigned long count1 = {};
for (auto j = begin; j < end; ++j)
{
if (bf.test(j))
{
++count1;
}
}
auto const count2 = bf.count(begin, end);
EXPECT_EQ(count1, count2);
}
auto bf = tr_bitfield{ 0 };
EXPECT_EQ(0, bf.count(0, 0));
EXPECT_EQ(0, bf.count(0, 1));
bf = tr_bitfield{ 100 };
EXPECT_EQ(0, bf.count(0, 0));
EXPECT_EQ(0, bf.count(0, 100));
bf.setHasAll();
EXPECT_EQ(0, bf.count(0, 0));
EXPECT_EQ(1, bf.count(0, 1));
EXPECT_EQ(100, bf.count(0, 100));
}
TEST(Bitfield, ctorFromFlagArray)
{
auto constexpr Tests = std::array<std::array<bool, 10>, 3>{ {
{ false, true, false, true, false, false, true, false, false, true }, // mixed
{ true, true, true, true, true, true, true, true, true, true }, // have all
{ false, false, false, false, false, false, false, false, false, false }, // have none
} };
for (auto const& flags : Tests)
{
size_t const true_count = std::count(std::begin(flags), std::end(flags), true);
size_t const n = std::size(flags);
bool const have_all = true_count == n;
bool const have_none = true_count == 0;
auto bf = tr_bitfield(n);
bf.setFromBools(std::data(flags), std::size(flags));
EXPECT_EQ(n, bf.size());
EXPECT_EQ(have_all, bf.hasAll());
EXPECT_EQ(have_none, bf.hasNone());
EXPECT_EQ(true_count, bf.count());
for (size_t i = 0; i < std::size(flags); ++i)
{
EXPECT_EQ(flags[i], bf.test(i));
}
}
}
TEST(Bitfield, setRaw)
{
auto constexpr TestByte = uint8_t{ 10 };
auto constexpr TestByteTrueBits = 2;
auto raw = std::vector<uint8_t>(100, TestByte);
auto bf = tr_bitfield(std::size(raw) * 8);
bf.setRaw(std::data(raw), std::size(raw));
EXPECT_EQ(TestByteTrueBits * std::size(raw), bf.count());
// The first byte of the bitfield corresponds to indices 0 - 7
// from high bit to low bit, respectively. The next one 8-15, etc.
// Spare bits at the end are set to zero.
auto test = uint8_t{};
for (int i = 0; i < 8; ++i)
{
if (bf.test(i))
{
test |= (1 << (7 - i));
}
}
EXPECT_EQ(TestByte, test);
EXPECT_EQ(raw, bf.raw());
// check that has-all bitfield gets all-true
bf = tr_bitfield(std::size(raw) * 8);
bf.setHasAll();
raw = bf.raw();
EXPECT_EQ(std::size(bf) / 8, std::size(raw));
EXPECT_EQ(std::numeric_limits<unsigned char>::max(), raw[0]);
// check that the spare bits t the end are zero
bf = tr_bitfield{ 1 };
uint8_t by = ~uint8_t{};
bf.setRaw(&by, 1);
EXPECT_TRUE(bf.hasAll());
EXPECT_FALSE(bf.hasNone());
EXPECT_EQ(1, bf.count());
raw = bf.raw();
EXPECT_EQ(1, std::size(raw));
EXPECT_EQ(1 << 7, raw[0]);
}
TEST(Bitfield, bitfields)
{
unsigned int bitcount = 500;
tr_bitfield field(bitcount);
// test tr_bitfield::set()
for (unsigned int i = 0; i < bitcount; i++)
{
if (i % 7 == 0)
{
field.set(i);
}
}
for (unsigned int i = 0; i < bitcount; i++)
{
EXPECT_EQ(field.test(i), (i % 7 == 0));
}
/* test tr_bitfield::setSpan */
field.setSpan(0, bitcount);
for (unsigned int i = 0; i < bitcount; i++)
{
EXPECT_TRUE(field.test(i));
}
/* test tr_bitfield::clearBit */
for (unsigned int i = 0; i < bitcount; i++)
{
if (i % 7 != 0)
{
field.unset(i);
}
}
for (unsigned int i = 0; i < bitcount; i++)
{
EXPECT_EQ(field.test(i), (i % 7 == 0));
}
/* test tr_bitfield::clearBitRange in the middle of a boundary */
field.setSpan(0, 64);
field.unsetSpan(4, 21);
for (unsigned int i = 0; i < 64; i++)
{
EXPECT_EQ(field.test(i), (i < 4 || i >= 21));
}
/* test tr_bitfield::clearBitRange on the boundaries */
field.setSpan(0, 64);
field.unsetSpan(8, 24);
for (unsigned int i = 0; i < 64; i++)
{
EXPECT_EQ(field.test(i), (i < 8 || i >= 24));
}
/* test tr_bitfield::clearBitRange when begin & end is on the same word */
field.setSpan(0, 64);
field.unsetSpan(4, 5);
for (unsigned int i = 0; i < 64; i++)
{
EXPECT_EQ(field.test(i), (i < 4 || i >= 5));
}
/* test tr_bitfield::setSpan */
field.unsetSpan(0, 64);
field.setSpan(4, 21);
for (unsigned int i = 0; i < 64; i++)
{
EXPECT_EQ(field.test(i), (4 <= i && i < 21));
}
/* test tr_bitfield::setSpan on the boundaries */
field.unsetSpan(0, 64);
field.setSpan(8, 24);
for (unsigned int i = 0; i < 64; i++)
{
EXPECT_EQ(field.test(i), (8 <= i && i < 24));
}
/* test tr_bitfield::setSpan when begin & end is on the same word */
field.unsetSpan(0, 64);
field.setSpan(4, 5);
for (unsigned int i = 0; i < 64; i++)
{
EXPECT_EQ(field.test(i), (4 <= i && i < 5));
}
/* test tr_bitfield::setSpan when end runs beyond the end of the bitfield */
field.setHasNone();
field.setSpan(100, 1000);
EXPECT_FALSE(field.hasNone());
EXPECT_FALSE(field.hasAll());
EXPECT_EQ(std::size(field) - 100, field.count());
/* test tr_bitfield::unsetSpan when it changes nothing */
field.setHasNone();
field.unsetSpan(0, 100);
EXPECT_TRUE(field.hasNone());
EXPECT_FALSE(field.hasAll());
EXPECT_EQ(0, field.count());
/* test tr_bitfield::setSpan when it changes nothing */
field.setHasAll();
field.setSpan(0, 100);
EXPECT_FALSE(field.hasNone());
EXPECT_TRUE(field.hasAll());
EXPECT_EQ(std::size(field), field.count());
/* test tr_bitfield::setSpan with an invalid span doesn't crash */
field.setHasAll();
field.setSpan(0, 0);
EXPECT_TRUE(field.hasAll());
}
TEST(Bitfield, hasAllNone)
{
{
tr_bitfield field(3);
EXPECT_TRUE(!field.hasAll());
EXPECT_TRUE(field.hasNone());
field.set(0);
EXPECT_TRUE(!field.hasAll());
EXPECT_TRUE(!field.hasNone());
field.unset(0);
field.set(1);
EXPECT_TRUE(!field.hasAll());
EXPECT_TRUE(!field.hasNone());
field.unset(1);
field.set(2);
EXPECT_TRUE(!field.hasAll());
EXPECT_TRUE(!field.hasNone());
field.set(0);
field.set(1);
EXPECT_TRUE(field.hasAll());
EXPECT_TRUE(!field.hasNone());
field.setHasNone();
EXPECT_TRUE(!field.hasAll());
EXPECT_TRUE(field.hasNone());
field.setHasAll();
EXPECT_TRUE(field.hasAll());
EXPECT_TRUE(!field.hasNone());
}
{
tr_bitfield field(0);
EXPECT_TRUE(!field.hasAll());
EXPECT_TRUE(!field.hasNone());
field.setHasNone();
EXPECT_TRUE(!field.hasAll());
EXPECT_TRUE(field.hasNone());
field.setHasAll();
EXPECT_TRUE(field.hasAll());
EXPECT_TRUE(!field.hasNone());
}
}
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