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#include <cstddef>
#include <cstdint>
#include <ranges>
#include "helpers/common.h"
#include "simdutf.h"
void autodetect(std::span<const char> chardata) {
std::vector<simdutf::encoding_type> results;
const auto implementations = get_supported_implementations();
for (const simdutf::implementation* impl : implementations) {
results.push_back(
impl->autodetect_encoding(chardata.data(), chardata.size()));
}
auto neq = [](const auto& a, const auto& b) { return a != b; };
if (std::ranges::adjacent_find(results, neq) != results.end()) {
std::cerr << "output differs between implementations\n";
for (std::size_t i = 0; i < implementations.size(); ++i) {
std::cerr << "implementation " << implementations[i] << " gave "
<< results.at(i) << '\n';
}
std::abort();
}
}
void detect(std::span<const char> chardata) {
std::vector<int> results;
const auto implementations = get_supported_implementations();
for (const simdutf::implementation* impl : implementations) {
results.push_back(impl->detect_encodings(chardata.data(), chardata.size()));
}
auto neq = [](const auto& a, const auto& b) { return a != b; };
if (std::ranges::adjacent_find(results, neq) != results.end()) {
std::cerr << "in detect_encodings(const char*, std::size_t):\n";
std::cerr << "output differs between implementations\n";
for (std::size_t i = 0; i < implementations.size(); ++i) {
std::cerr << "implementation " << implementations[i]->name() << " gave "
<< results.at(i) << '\n';
}
std::cerr << " std::vector<unsigned char> data{";
for (unsigned char x : chardata) {
std::cerr << +x << ", ";
};
std::cerr << "};\n";
std::abort();
}
}
void validate_ascii(std::span<const char> chardata) {
// use int, not bool to avoid vector<bool>
std::vector<int> results;
const auto implementations = get_supported_implementations();
for (const simdutf::implementation* impl : implementations) {
results.push_back(+impl->validate_ascii(chardata.data(), chardata.size()));
}
auto neq = [](const auto& a, const auto& b) { return a != b; };
if (std::ranges::adjacent_find(results, neq) != results.end()) {
std::cerr << "in validate_ascii(const char*, std::size_t):\n";
std::cerr << "output differs between implementations\n";
for (std::size_t i = 0; i < implementations.size(); ++i) {
std::cerr << "implementation " << implementations[i]->name() << " gave "
<< results.at(i) << '\n';
}
std::cerr << " std::vector<unsigned char> data{";
for (unsigned char x : chardata) {
std::cerr << +x << ", ";
};
std::cerr << "};\n";
std::abort();
}
}
void validate_ascii_with_err(std::span<const char> chardata) {
// use int, not bool to avoid vector<bool>
std::vector<simdutf::result> results;
const auto implementations = get_supported_implementations();
for (const simdutf::implementation* impl : implementations) {
results.push_back(
impl->validate_ascii_with_errors(chardata.data(), chardata.size()));
}
auto neq = [](const auto& a, const auto& b) { return a != b; };
if (std::ranges::adjacent_find(results, neq) != results.end()) {
std::cerr << "in validate_ascii(const char*, std::size_t):\n";
std::cerr << "output differs between implementations\n";
for (std::size_t i = 0; i < implementations.size(); ++i) {
std::cerr << "implementation " << implementations[i]->name() << " gave "
<< results.at(i) << '\n';
}
std::cerr << " std::vector<unsigned char> data{";
for (unsigned char x : chardata) {
std::cerr << +x << ", ";
};
std::cerr << "};\n";
std::abort();
}
}
void utf16_endianess(std::span<const char16_t> data) {
std::vector<std::string> results;
const auto implementations = get_supported_implementations();
for (const simdutf::implementation* impl : implementations) {
std::vector<char16_t> out(data.size());
impl->change_endianness_utf16(data.data(), data.size(), out.data());
results.push_back(FNV1A_hash::as_str(out));
}
auto neq = [](const auto& a, const auto& b) { return a != b; };
if (std::ranges::adjacent_find(results, neq) != results.end()) {
std::cerr << "in utf16_endianess(const char*, std::size_t):\n";
std::cerr << "output differs between implementations\n";
for (std::size_t i = 0; i < implementations.size(); ++i) {
std::cerr << "implementation " << implementations[i]->name() << " gave "
<< results.at(i) << '\n';
}
std::cerr << " std::vector<char16_t> data{";
for (int x : data) {
std::cerr << +x << ", ";
};
std::cerr << "};\n";
std::abort();
}
}
void convert_latin1_to_utf8_safe(std::span<const char> chardata,
const std::size_t outputsize) {
// convert with a limited output buffer
std::vector<char> limited_output(outputsize);
const auto limited_ret = simdutf::convert_latin1_to_utf8_safe(
chardata.data(), chardata.size(), limited_output.data(), outputsize);
// convert with a sufficiently large output buffer
std::vector<char> large_output(2 * chardata.size());
const auto large_ret = simdutf::convert_latin1_to_utf8(
chardata.data(), chardata.size(), large_output.data());
if (large_ret != 0) {
// conversion was possible with a large buffer.
if (large_ret <= outputsize) {
// the limited buffer was large enough, ensure we got the same result
assert(limited_ret == large_ret);
assert(std::ranges::equal(limited_output | std::views::take(large_ret),
large_output | std::views::take(large_ret)));
} else {
// the number of written bytes for a limited buffer must not exceed what
// the large buffer got.
assert(limited_ret <= large_ret);
// the written data should be equal
assert(std::ranges::equal(limited_output | std::views::take(limited_ret),
large_output | std::views::take(limited_ret)));
}
} else {
// conversion with a big buffer failed - is there anything we can check or
// assert for the limited buffer? I don't think so.
}
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
// pick one of the functions, based on the fuzz data.
// the first byte is which action to take. step forward
// several bytes so the input is aligned.
if (size < 4) {
return 0;
}
constexpr auto Ncases = 9u;
constexpr auto actionmask = std::bit_ceil(Ncases) - 1;
const auto action = data[0] & actionmask;
const std::uint16_t u16 = data[1] + (data[2] << 8);
data += 4;
size -= 4;
const std::span<const char> chardata{(const char*)data, size};
const std::span<const char16_t> u16data{(const char16_t*)data,
size / sizeof(char16_t)};
switch (action) {
case 0:
autodetect(chardata);
break;
case 1:
detect(chardata);
break;
case 2:
validate_ascii(chardata);
break;
case 3:
validate_ascii_with_err(chardata);
break;
case 4:
utf16_endianess(u16data);
break;
case 5: {
[[maybe_unused]] auto ret =
simdutf::trim_partial_utf16le(u16data.data(), u16data.size());
assert(ret == u16data.size() || ret + 1 == u16data.size());
} break;
case 6: {
[[maybe_unused]] auto ret =
simdutf::trim_partial_utf16be(u16data.data(), u16data.size());
assert(ret == u16data.size() || ret + 1 == u16data.size());
} break;
case 7: {
[[maybe_unused]] const std::size_t N = chardata.size();
[[maybe_unused]] const auto ret =
simdutf::trim_partial_utf8(chardata.data(), chardata.size());
if ((ret + 3 < N) || (ret > N)) {
std::cerr << "ret=" << ret << " N=" << N << '\n';
std::abort();
}
} break;
case 8:
convert_latin1_to_utf8_safe(chardata, u16);
break;
}
return 0;
}
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