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// Copyright 2017 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.
#ifndef COMPONENTS_ZUCCHINI_ELEMENT_DETECTION_H_
#define COMPONENTS_ZUCCHINI_ELEMENT_DETECTION_H_
#include <stddef.h>
#include <memory>
#include "base/callback.h"
#include "components/zucchini/buffer_view.h"
#include "components/zucchini/image_utils.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace zucchini {
class Disassembler;
// Attempts to detect an executable located at start of |image|. If found,
// returns the corresponding disassembler. Otherwise returns null.
std::unique_ptr<Disassembler> MakeDisassemblerWithoutFallback(
ConstBufferView image);
// Attempts to create a disassembler corresponding to |exe_type| and initialize
// it with |image|, On failure, returns null.
std::unique_ptr<Disassembler> MakeDisassemblerOfType(ConstBufferView image,
ExecutableType exe_type);
// Attempts to detect an element associated with |image| and returns it, or
// returns nullopt if no element is detected.
using ElementDetector =
base::RepeatingCallback<absl::optional<Element>(ConstBufferView image)>;
// Implementation of ElementDetector using disassemblers.
absl::optional<Element> DetectElementFromDisassembler(ConstBufferView image);
// A class to scan through an image and iteratively detect elements.
class ElementFinder {
public:
ElementFinder(ConstBufferView image, ElementDetector&& detector);
ElementFinder(const ElementFinder&) = delete;
const ElementFinder& operator=(const ElementFinder&) = delete;
~ElementFinder();
// Scans for the next executable using |detector|. Returns the next element
// found, or nullopt if no more element can be found.
absl::optional<Element> GetNext();
private:
ConstBufferView image_;
ElementDetector detector_;
offset_t pos_ = 0;
};
} // namespace zucchini
#endif // COMPONENTS_ZUCCHINI_ELEMENT_DETECTION_H_
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