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/*
* Copyright 2006 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.
*/
#pragma once
#include <sys/types.h>
#include <string>
#include <string_view>
#include <vector>
#include "rangeset.h"
// This class holds the content of a block map file.
class BlockMapData {
public:
// A "block map" which looks like this (from uncrypt/uncrypt.cpp):
//
// /dev/block/platform/msm_sdcc.1/by-name/userdata # block device
// 49652 4096 # file size in bytes, block size
// 3 # count of block ranges
// 1000 1008 # block range 0
// 2100 2102 # ... block range 1
// 30 33 # ... block range 2
//
// Each block range represents a half-open interval; the line "30 33" reprents the blocks
// [30, 31, 32].
static BlockMapData ParseBlockMapFile(const std::string& block_map_path);
explicit operator bool() const {
return !path_.empty();
}
std::string path() const {
return path_;
}
uint64_t file_size() const {
return file_size_;
}
uint32_t block_size() const {
return block_size_;
}
RangeSet block_ranges() const {
return block_ranges_;
}
private:
BlockMapData() = default;
BlockMapData(const std::string& path, uint64_t file_size, uint32_t block_size,
RangeSet block_ranges)
: path_(path),
file_size_(file_size),
block_size_(block_size),
block_ranges_(std::move(block_ranges)) {}
std::string path_;
uint64_t file_size_ = 0;
uint32_t block_size_ = 0;
RangeSet block_ranges_;
};
/*
* Use this to keep track of mapped segments.
*/
class MemMapping {
public:
~MemMapping();
// Map a file into a private, read-only memory segment. If 'filename' begins with an '@'
// character, it is a map of blocks to be mapped, otherwise it is treated as an ordinary file.
bool MapFile(const std::string& filename);
size_t ranges() const {
return ranges_.size();
};
unsigned char* addr; // start of data
size_t length; // length of data
private:
struct MappedRange {
void* addr;
size_t length;
};
bool MapBlockFile(const std::string& filename);
bool MapFD(int fd);
std::vector<MappedRange> ranges_;
};
// Reboots the device into the specified target, by additionally handling quiescent reboot mode.
// All unknown targets reboot into Android.
bool Reboot(std::string_view target);
// Triggers a shutdown.
bool Shutdown(std::string_view target);
// Returns a null-terminated char* array, where the elements point to the C-strings in the given
// vector, plus an additional nullptr at the end. This is a helper function that facilitates
// calling C functions (such as getopt(3)) that expect an array of C-strings.
std::vector<char*> StringVectorToNullTerminatedArray(const std::vector<std::string>& args);
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