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103 lines
2.2 KiB
C++
103 lines
2.2 KiB
C++
// Copyright (c) 2019, Paul Dreik
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// For the license information refer to format.h.
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#include <fmt/chrono.h>
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#include <cstdint>
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#include <type_traits>
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#include <vector>
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#include "fuzzer-common.h"
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template <typename T>
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void invoke_fmt(const uint8_t* data, size_t size, unsigned arg_name_size) {
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static_assert(sizeof(T) <= fixed_size, "fixed_size too small");
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if (size <= fixed_size) return;
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const T value = assign_from_buf<T>(data);
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data += fixed_size;
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size -= fixed_size;
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if (arg_name_size <= 0 || arg_name_size >= size) return;
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data_to_string arg_name(data, arg_name_size, true);
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data += arg_name_size;
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size -= arg_name_size;
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data_to_string format_str(data, size);
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try {
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#if FMT_FUZZ_FORMAT_TO_STRING
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std::string message =
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fmt::format(format_str.get(), fmt::arg(arg_name.data(), value));
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#else
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fmt::memory_buffer out;
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fmt::format_to(std::back_inserter(out), format_str.get(),
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fmt::arg(arg_name.data(), value));
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#endif
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} catch (std::exception&) {
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}
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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 type, Callback callback) {
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switch (type) {
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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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}
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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 type = data[0] & 0x0F;
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const unsigned arg_name_size = (data[0] & 0xF0) >> 4;
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data++;
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size--;
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invoke(type, [=](auto arg) {
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invoke_fmt<decltype(arg)>(data, size, arg_name_size);
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});
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return 0;
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}
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