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// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright OpenBMC Authors
#include <boost/asio/buffer.hpp>
#include <algorithm>
#include <climits>
#include <cstdint>
#include <functional>
#include <vector>
#ifdef HAVE_ZSTD
#include "zstd_compressor.hpp"
#include "zstd_decompressor.hpp"
#include "zstd_test_arrays.hpp"
#include <cstddef>
#include <optional>
#include <random>
#include <span>
#include <gmock/gmock.h>
#include <gtest/gtest.h>
using ::testing::ElementsAreArray;
namespace bmcweb
{
namespace
{
TEST(ZstdCompressor, EmptyFile)
{
ZstdCompressor comp;
ASSERT_TRUE(comp.init(0U));
std::vector<uint8_t> out;
bool more = false;
std::vector<uint8_t> empty;
std::optional<std::span<const uint8_t>> segmentOut =
comp.compress(empty, more);
ASSERT_TRUE(segmentOut);
if (!segmentOut)
{
return;
}
EXPECT_THAT(*segmentOut, ElementsAreArray(zstd::empty));
}
TEST(ZstdCompressor, AllZeros)
{
for (size_t chunkSize : {1U, 2U, 4U, 8U, 1024U, 1048576U})
{
ZstdCompressor comp;
constexpr size_t fileSize = 1048576U;
ASSERT_TRUE(comp.init(fileSize));
std::vector<uint8_t> out;
std::vector<uint8_t> zeros(chunkSize, 0x00);
for (size_t i = 0; i < fileSize; i += chunkSize)
{
bool more = i != fileSize - chunkSize;
std::optional<std::span<const uint8_t>> segmentOut =
comp.compress(zeros, more);
ASSERT_TRUE(segmentOut);
if (!segmentOut)
{
return;
}
out.insert(out.end(), segmentOut->begin(), segmentOut->end());
}
EXPECT_THAT(out, ElementsAreArray(zstd::zeros));
}
}
TEST(ZstdCompressor, AllOnes)
{
ZstdCompressor comp;
ASSERT_TRUE(comp.init(1048576U));
std::vector<uint8_t> out;
std::vector<uint8_t> zeros(1024U, 0xFF);
for (size_t i = 0; i < 1024U; i++)
{
bool more = i < 1023U;
std::optional<std::span<const uint8_t>> segmentOut =
comp.compress(zeros, more);
ASSERT_TRUE(segmentOut);
if (!segmentOut)
{
return;
}
out.insert(out.end(), segmentOut->begin(), segmentOut->end());
}
EXPECT_THAT(out, ElementsAreArray(zstd::ones));
}
TEST(Zstd, RoundTrip)
{
using random_bytes_engine =
std::independent_bits_engine<std::default_random_engine, CHAR_BIT,
unsigned char>;
// This is a unit test, we WANT reproducible tests
// NOLINTNEXTLINE(cert-msc51-cpp, cert-msc32-c)
random_bytes_engine rbe;
std::vector<unsigned char> data(1048576U);
std::ranges::generate(data, std::ref(rbe));
for (size_t chunkSize : {1U, 2U, 4U, 8U, 1024U, 1048576U})
{
ZstdCompressor comp;
std::vector<uint8_t> compressed;
ASSERT_TRUE(comp.init(data.size()));
for (size_t i = 0; i < data.size(); i += chunkSize)
{
bool more = i != data.size() - chunkSize;
std::optional<std::span<const uint8_t>> segmentOut =
comp.compress(std::span(data).subspan(i, chunkSize), more);
ASSERT_TRUE(segmentOut);
if (!segmentOut)
{
return;
}
compressed.insert(compressed.end(), segmentOut->begin(),
segmentOut->end());
}
ZstdDecompressor decomp;
std::optional<boost::asio::const_buffer> segmentOut =
decomp.decompress(boost::asio::buffer(compressed));
ASSERT_TRUE(segmentOut);
if (!segmentOut)
{
continue;
}
std::span<const uint8_t> decompressedSpan = std::span<const uint8_t>(
static_cast<const uint8_t*>(segmentOut->data()),
segmentOut->size());
EXPECT_THAT(decompressedSpan, ElementsAreArray(data));
}
}
} // namespace
} // namespace bmcweb
#endif
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