1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <stdint.h>
18 #include <map>
19 #include <memory>
20 #include <string>
21 
22 #include <android-base/unique_fd.h>
23 #include <liblp/liblp.h>
24 #include <sparse/sparse.h>
25 
26 namespace android {
27 namespace fs_mgr {
28 
29 // Helper function to serialize geometry and metadata to a normal file, for
30 // flashing or debugging.
31 std::unique_ptr<LpMetadata> ReadFromImageFile(int fd);
32 
33 // We use an object to build the image file since it requires that data
34 // pointers be held alive until the sparse file is destroyed. It's easier
35 // to do this when the data pointers are all in one place.
36 class ImageBuilder {
37   public:
38     ImageBuilder(const LpMetadata& metadata, uint32_t block_size,
39                  const std::map<std::string, std::string>& images, bool sparsify);
40 
41     bool Build();
42     bool Export(const std::string& file);
43     bool ExportFiles(const std::string& dir);
44     bool IsValid() const;
45 
46     using SparsePtr = std::unique_ptr<sparse_file, decltype(&sparse_file_destroy)>;
device_images()47     const std::vector<SparsePtr>& device_images() const { return device_images_; }
48 
49   private:
50     bool AddData(sparse_file* file, const std::string& blob, uint64_t sector);
51     bool AddPartitionImage(const LpMetadataPartition& partition, const std::string& file);
52     int OpenImageFile(const std::string& file);
53     bool SectorToBlock(uint64_t sector, uint32_t* block);
54     uint64_t BlockToSector(uint64_t block) const;
55     bool CheckExtentOrdering();
56     uint64_t ComputePartitionSize(const LpMetadataPartition& partition) const;
57 
58     const LpMetadata& metadata_;
59     const LpMetadataGeometry& geometry_;
60     uint32_t block_size_;
61     bool sparsify_;
62 
63     std::vector<SparsePtr> device_images_;
64     std::string all_metadata_;
65     std::map<std::string, std::string> images_;
66     std::vector<android::base::unique_fd> temp_fds_;
67 };
68 
69 }  // namespace fs_mgr
70 }  // namespace android
71