chromium/third_party/perfetto/src/protozero/filtering/string_filter.cc

/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "src/protozero/filtering/string_filter.h"

#include <cstring>
#include <regex>
#include <string_view>

#include "perfetto/base/compiler.h"
#include "perfetto/base/logging.h"
#include "perfetto/ext/base/string_view.h"
#include "perfetto/public/compiler.h"

namespace protozero {
namespace {

Matches;

static constexpr std::string_view kRedacted = …;
static constexpr char kRedactedDash = …;

// Returns a pointer to the first character after the tgid pipe character in
// the atrace string given by [ptr, end). Returns null if no such character
// exists.
//
// Examples:
// E|1024 -> nullptr
// foobarbaz -> nullptr
// B|1024|x -> pointer to x
const char* FindAtracePayloadPtr(const char* ptr, const char* end) { … }

bool StartsWith(const char* ptr,
                const char* end,
                const std::string& starts_with) { … }

void RedactMatches(const Matches& matches) { … }

}  // namespace

void StringFilter::AddRule(Policy policy,
                           std::string_view pattern_str,
                           std::string atrace_payload_starts_with) { … }

bool StringFilter::MaybeFilterInternal(char* ptr, size_t len) const { … }

}  // namespace protozero