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 #ifndef LIBLP_READER_H_ 18 #define LIBLP_READER_H_ 19 20 #include <stddef.h> 21 22 #include <memory> 23 24 #include <liblp/liblp.h> 25 26 namespace android { 27 namespace fs_mgr { 28 29 // Parse an LpMetadataGeometry from a buffer. The buffer must be at least 30 // LP_METADATA_GEOMETRY_SIZE bytes in size. 31 bool ParseGeometry(const void* buffer, LpMetadataGeometry* geometry); 32 33 // Helper functions for manually reading geometry and metadata. 34 std::unique_ptr<LpMetadata> ParseMetadata(const LpMetadataGeometry& geometry, int fd); 35 std::unique_ptr<LpMetadata> ParseMetadata(const LpMetadataGeometry& geometry, const void* buffer, 36 size_t size); 37 bool ReadLogicalPartitionGeometry(int fd, LpMetadataGeometry* geometry); 38 bool ReadPrimaryGeometry(int fd, LpMetadataGeometry* geometry); 39 bool ReadBackupGeometry(int fd, LpMetadataGeometry* geometry); 40 41 // These functions assume a valid geometry and slot number, and do not obey 42 // auto-slot-suffixing. They are used for tests and for checking whether 43 // the metadata is coherent across primary and backup copies. 44 std::unique_ptr<LpMetadata> ReadPrimaryMetadata(int fd, const LpMetadataGeometry& geometry, 45 uint32_t slot_number); 46 std::unique_ptr<LpMetadata> ReadBackupMetadata(int fd, const LpMetadataGeometry& geometry, 47 uint32_t slot_number); 48 49 } // namespace fs_mgr 50 } // namespace android 51 52 #endif /* LIBLP_READER_H_ */ 53