// Copyright (c) 2009-2019 The Bitcoin Core developers
// Copyright (c) 2020-2022 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <test/fuzz/fuzz.h>

#include <pubkey.h>

#include <memory>
#include <unistd.h>

const std::function<std::string(const char *)> G_TRANSLATION_FUN = nullptr;

static bool read_stdin(std::vector<uint8_t> &data) {
    uint8_t buffer[1024];
    ssize_t length = 0;
    while ((length = read(STDIN_FILENO, buffer, 1024)) > 0) {
        data.insert(data.end(), buffer, buffer + length);

        if (data.size() > (1 << 20)) {
            return false;
        }
    }
    return length == 0;
}

static void initialize() {
    const static auto verify_handle = std::make_unique<ECCVerifyHandle>();
}

// This function is used by libFuzzer
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
    test_one_input(Span<const uint8_t>(data, size));
    return 0;
}

// This function is used by libFuzzer
extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
    initialize();
    return 0;
}

// Disabled under WIN32 due to clash with Cygwin's WinMain.
#ifndef WIN32
// Declare main(...) "weak" to allow for libFuzzer linking. libFuzzer provides
// the main(...) function.
__attribute__((weak))
#endif
int main(int argc, char **argv) {
    initialize();
#ifdef __AFL_INIT
    // Enable AFL deferred forkserver mode. Requires compilation using
    // afl-clang-fast++. See fuzzing.md for details.
    __AFL_INIT();
#endif

#ifdef __AFL_LOOP
    // Enable AFL persistent mode. Requires compilation using afl-clang-fast++.
    // See fuzzing.md for details.
    while (__AFL_LOOP(1000)) {
        std::vector<uint8_t> buffer;
        if (!read_stdin(buffer)) {
            continue;
        }
        test_one_input(buffer);
    }
#else
    std::vector<uint8_t> buffer;
    if (!read_stdin(buffer)) {
        return 0;
    }
    test_one_input(buffer);
#endif
    return 0;
}
