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108 lines
2.3 KiB
C++
108 lines
2.3 KiB
C++
// Copyright (c) 2019, Paul Dreik
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// For the license information refer to format.h.
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#include <cstdint>
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#include <exception>
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#include <string>
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#include <fmt/format.h>
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#include "fuzzer-common.h"
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template <typename Item1, typename Item2>
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void invoke_fmt(const uint8_t* data, size_t size) {
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using fmt_fuzzer::nfixed;
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static_assert(sizeof(Item1) <= nfixed, "size1 exceeded");
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static_assert(sizeof(Item2) <= nfixed, "size2 exceeded");
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if (size <= nfixed + nfixed) return;
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const Item1 item1 = fmt_fuzzer::assignFromBuf<Item1>(data);
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data += nfixed;
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size -= nfixed;
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const Item2 item2 = fmt_fuzzer::assignFromBuf<Item2>(data);
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data += nfixed;
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size -= nfixed;
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auto format_str = fmt::string_view(fmt_fuzzer::as_chars(data), size);
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#if FMT_FUZZ_FORMAT_TO_STRING
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std::string message = fmt::format(format_str, item1, item2);
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#else
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fmt::memory_buffer message;
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fmt::format_to(message, format_str, item1, item2);
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#endif
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}
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// For dynamic dispatching to an explicit instantiation.
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template <typename Callback> void invoke(int index, Callback callback) {
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switch (index) {
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case 0:
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callback(bool());
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break;
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case 1:
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callback(char());
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break;
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case 2:
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using sc = signed char;
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callback(sc());
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break;
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case 3:
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using uc = unsigned char;
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callback(uc());
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break;
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case 4:
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callback(short());
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break;
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case 5:
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using us = unsigned short;
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callback(us());
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break;
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case 6:
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callback(int());
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break;
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case 7:
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callback(unsigned());
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break;
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case 8:
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callback(long());
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break;
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case 9:
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using ul = unsigned long;
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callback(ul());
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break;
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case 10:
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callback(float());
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break;
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case 11:
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callback(double());
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break;
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case 12:
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using LD = long double;
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callback(LD());
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break;
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case 13:
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using ptr = void*;
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callback(ptr());
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break;
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}
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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if (size <= 3) return 0;
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// Switch types depending on the first byte of the input.
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const auto first = data[0] & 0x0F;
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const auto second = (data[0] & 0xF0) >> 4;
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data++;
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size--;
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try {
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invoke(first, [=](auto param1) {
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invoke(second, [=](auto param2) {
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invoke_fmt<decltype(param1), decltype(param2)>(data, size);
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});
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});
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} catch (std::exception&) {
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}
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return 0;
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}
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