//
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// Copyright (C) 2018 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_BOOT_IMG_FILESYSTEM_H_
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#define UPDATE_ENGINE_PAYLOAD_GENERATOR_BOOT_IMG_FILESYSTEM_H_
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#include "update_engine/payload_generator/filesystem_interface.h"
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#include <memory>
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#include <string>
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#include <vector>
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namespace chromeos_update_engine {
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class BootImgFilesystem : public FilesystemInterface {
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public:
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// Creates an BootImgFilesystem from an Android boot.img file.
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static std::unique_ptr<BootImgFilesystem> CreateFromFile(
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const std::string& filename);
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~BootImgFilesystem() override = default;
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// FilesystemInterface overrides.
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size_t GetBlockSize() const override;
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size_t GetBlockCount() const override;
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// GetFiles will return one FilesystemInterface::File for kernel and one for
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// ramdisk.
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bool GetFiles(std::vector<File>* files) const override;
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bool LoadSettings(brillo::KeyValueStore* store) const override;
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private:
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friend class BootImgFilesystemTest;
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BootImgFilesystem() = default;
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File GetFile(const std::string& name, uint64_t offset, uint64_t size) const;
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// The boot.img file path.
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std::string filename_;
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// https://android.googlesource.com/platform/system/core/+/master/mkbootimg/include/bootimg/bootimg.h
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#define BOOT_MAGIC "ANDROID!"
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#define BOOT_MAGIC_SIZE 8
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struct boot_img_hdr {
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// Must be BOOT_MAGIC.
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uint8_t magic[BOOT_MAGIC_SIZE];
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uint32_t kernel_size; /* size in bytes */
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uint32_t kernel_addr; /* physical load addr */
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uint32_t ramdisk_size; /* size in bytes */
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uint32_t ramdisk_addr; /* physical load addr */
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uint32_t second_size; /* size in bytes */
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uint32_t second_addr; /* physical load addr */
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uint32_t tags_addr; /* physical addr for kernel tags */
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uint32_t page_size; /* flash page size we assume */
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} __attribute__((packed));
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// The boot image header.
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boot_img_hdr hdr_;
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DISALLOW_COPY_AND_ASSIGN(BootImgFilesystem);
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};
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_BOOT_IMG_FILESYSTEM_H_
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