1 // 2 // Copyright (C) 2017 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 UPDATE_ENGINE_PAYLOAD_GENERATOR_DEFLATE_UTILS_H_ 18 #define UPDATE_ENGINE_PAYLOAD_GENERATOR_DEFLATE_UTILS_H_ 19 20 #include <puffin/puffdiff.h> 21 #include <vector> 22 23 #include "update_engine/payload_generator/filesystem_interface.h" 24 #include "update_engine/payload_generator/payload_generation_config.h" 25 26 namespace chromeos_update_engine { 27 namespace deflate_utils { 28 29 // Gets the files from the partition and processes all its files. Processing 30 // includes: 31 // - splitting large Squashfs containers into its smaller files. 32 bool PreprocessParitionFiles(const PartitionConfig& part, 33 std::vector<FilesystemInterface::File>* result, 34 bool extract_deflates); 35 36 // Spreads all extents in |over_extents| over |base_extents|. Here we assume the 37 // |over_extents| are non-overlapping and sorted by their offset. 38 // 39 // |base_extents|: 40 // | ----------------------- ------ -------------- 41 // |over_extents|: 42 // | ========== ==== ========== ====== 43 // |over_extents| is transforms to: 44 // | ========== ==== = ====== === ====== 45 // 46 bool ShiftExtentsOverExtents(const std::vector<Extent>& base_extents, 47 std::vector<Extent>* over_extents); 48 49 // Spreads all extents in |over_extents| over |base_extents|. Here we assume the 50 // |over_extents| are non-overlapping and sorted by their offset. An item in 51 // |over_extents| is removed if it is spread in two or more extents in 52 // |base_extents|. 53 // 54 // |base_extents|: 55 // | ----------------------- ------ -------------- 56 // |over_extents|: 57 // | ========== ==== ========== ====== 58 // |over_extents| is transforms to: 59 // | ========== ==== ====== 60 // 61 bool ShiftBitExtentsOverExtents(const std::vector<Extent>& base_extents, 62 std::vector<puffin::BitExtent>* over_extents); 63 64 // Finds all deflate locations in |deflates| that are inside an Extent in 65 // |extents|. This function should not change the order of deflates. 66 std::vector<puffin::BitExtent> FindDeflates( 67 const std::vector<Extent>& extents, 68 const std::vector<puffin::BitExtent>& deflates); 69 70 // Creates a new list of deflate locations (|out_deflates|) from |in_deflates| 71 // by assuming all extents in the |extents| have been put together 72 // linearly. This function assumes that all deflate locations given in 73 // |in_deflates| are located somewhere in the |extents|. |out_deflates| should 74 // be empty on call. 75 // 76 // |extents|: 77 // | ----------------------- ------ -------------- 78 // |in_deflates|: 79 // | ======== ==== ==== ====== 80 // |out_deflates|: 81 // | ======== ==== ==== ====== 82 // 83 bool CompactDeflates(const std::vector<Extent>& extents, 84 const std::vector<puffin::BitExtent>& in_deflates, 85 std::vector<puffin::BitExtent>* out_deflates); 86 87 // Combines |FindDeflates| and |CompcatDeflates| for ease of use. 88 bool FindAndCompactDeflates(const std::vector<Extent>& extents, 89 const std::vector<puffin::BitExtent>& in_deflates, 90 std::vector<puffin::BitExtent>* out_deflates); 91 92 // Expands a BitExtents to a ByteExtent. 93 puffin::ByteExtent ExpandToByteExtent(const puffin::BitExtent& extent); 94 95 } // namespace deflate_utils 96 } // namespace chromeos_update_engine 97 #endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_DEFLATE_UTILS_H_ 98
