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// Copyright (c) 2020-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <span.h>
#include <streams.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <array>
#include <cstddef>
#include <cstdint>
#include <iostream>
#include <optional>
#include <vector>
FUZZ_TARGET(buffered_file)
{
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
FuzzedFileProvider fuzzed_file_provider{fuzzed_data_provider};
std::optional<BufferedFile> opt_buffered_file;
AutoFile fuzzed_file{
fuzzed_file_provider.open(),
ConsumeRandomLengthByteVector<std::byte>(fuzzed_data_provider),
};
try {
auto n_buf_size = fuzzed_data_provider.ConsumeIntegralInRange<uint64_t>(0, 4096);
auto n_rewind_in = fuzzed_data_provider.ConsumeIntegralInRange<uint64_t>(0, 4096);
opt_buffered_file.emplace(fuzzed_file, n_buf_size, n_rewind_in);
} catch (const std::ios_base::failure&) {
}
if (opt_buffered_file && !fuzzed_file.IsNull()) {
bool setpos_fail = false;
LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 100)
{
CallOneOf(
fuzzed_data_provider,
[&] {
std::array<std::byte, 4096> arr{};
try {
opt_buffered_file->read({arr.data(), fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, 4096)});
} catch (const std::ios_base::failure&) {
}
},
[&] {
opt_buffered_file->SetLimit(fuzzed_data_provider.ConsumeIntegralInRange<uint64_t>(0, 4096));
},
[&] {
if (!opt_buffered_file->SetPos(fuzzed_data_provider.ConsumeIntegralInRange<uint64_t>(0, 4096))) {
setpos_fail = true;
}
},
[&] {
if (setpos_fail) {
// Calling FindByte(...) after a failed SetPos(...) call may result in an infinite loop.
return;
}
try {
opt_buffered_file->FindByte(std::byte(fuzzed_data_provider.ConsumeIntegral<uint8_t>()));
} catch (const std::ios_base::failure&) {
}
},
[&] {
ReadFromStream(fuzzed_data_provider, *opt_buffered_file);
});
}
opt_buffered_file->GetPos();
}
}
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