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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <stdint.h>
#include <random>
#include <string>
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/i18n/icu_util.h"
#include "components/search_engines/search_terms_data.h"
#include "components/search_engines/template_url.h"
#include "components/search_engines/template_url_parser.h"
class PseudoRandomFilter : public TemplateURLParser::ParameterFilter {
public:
explicit PseudoRandomFilter(uint32_t seed) : generator_(seed), pool_(0, 1) {}
~PseudoRandomFilter() override = default;
bool KeepParameter(const std::string&, const std::string&) override {
// Return true 254/255 times, ie: as if pool_ only returned uint8_t.
return pool_(generator_) % (UINT8_MAX + 1);
}
private:
std::mt19937 generator_;
// Use a uint16_t here instead of uint8_t because uniform_int_distribution
// does not support 8 bit types on Windows.
std::uniform_int_distribution<uint16_t> pool_;
};
struct FuzzerFixedParams {
uint32_t seed_;
};
base::AtExitManager at_exit_manager; // used by ICU integration
extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) {
CHECK(base::i18n::InitializeICU());
CHECK(base::CommandLine::Init(*argc, *argv));
return 0;
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
if (size < sizeof(FuzzerFixedParams)) {
return 0;
}
const FuzzerFixedParams* params =
reinterpret_cast<const FuzzerFixedParams*>(data);
size -= sizeof(FuzzerFixedParams);
const char* char_data = reinterpret_cast<const char*>(params + 1);
PseudoRandomFilter filter(params->seed_);
TemplateURLParser::Parse(SearchTermsData(), char_data, size, &filter);
return 0;
}
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