1 // 2 // Copyright (C) 2021 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_BLOCK_EXTENT_WRITER_H_ 18 #define UPDATE_ENGINE_BLOCK_EXTENT_WRITER_H_ 19 20 #include <cstdint> 21 #include <vector> 22 23 #include "update_engine/payload_consumer/extent_writer.h" 24 #include "update_engine/update_metadata.pb.h" 25 26 namespace chromeos_update_engine { 27 28 // Cache data upto size of one extent before writing. 29 class BlockExtentWriter : public chromeos_update_engine::ExtentWriter { 30 public: 31 BlockExtentWriter() = default; 32 ~BlockExtentWriter() = default; 33 // Returns true on success. 34 bool Init(const google::protobuf::RepeatedPtrField<Extent>& extents, 35 uint32_t block_size) override; 36 // Returns true on success. 37 bool Write(const void* bytes, size_t count) final; 38 // Write data for 1 extent. |bytes| will be a pointer which points to data of 39 // size |extent.num_blocks()*block_size|. |extent| is the current extent we 40 // are writing to. 41 virtual bool WriteExtent(const void* bytes, 42 const Extent& extent, 43 size_t block_size) = 0; BlockSize()44 size_t BlockSize() const { return block_size_; } 45 46 private: 47 bool NextExtent(); 48 [[nodiscard]] size_t ConsumeWithBuffer(const uint8_t* bytes, size_t count); 49 // It's a non-owning pointer, because PartitionWriter owns the CowWruter. This 50 // allows us to use a single instance of CowWriter for all operations applied 51 // to the same partition. 52 google::protobuf::RepeatedPtrField<Extent> extents_; 53 size_t cur_extent_idx_; 54 std::vector<uint8_t> buffer_; 55 size_t block_size_; 56 }; 57 58 } // namespace chromeos_update_engine 59 60 #endif 61