1 // 2 // Copyright (C) 2020 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 #pragma once 18 19 #include <libsnapshot/cow_reader.h> 20 21 namespace android { 22 namespace snapshot { 23 24 class IByteStream { 25 public: ~IByteStream()26 virtual ~IByteStream() {} 27 28 // Read up to |length| bytes, storing the number of bytes read in the out- 29 // parameter. If the end of the stream is reached, 0 is returned. 30 virtual bool Read(void* buffer, size_t length, size_t* read) = 0; 31 32 // Size of the stream. 33 virtual size_t Size() const = 0; 34 }; 35 36 class IDecompressor { 37 public: ~IDecompressor()38 virtual ~IDecompressor() {} 39 40 // Factory methods for decompression methods. 41 static std::unique_ptr<IDecompressor> Uncompressed(); 42 static std::unique_ptr<IDecompressor> Gz(); 43 static std::unique_ptr<IDecompressor> Brotli(); 44 45 // |output_bytes| is the expected total number of bytes to sink. 46 virtual bool Decompress(size_t output_bytes) = 0; 47 set_stream(IByteStream * stream)48 void set_stream(IByteStream* stream) { stream_ = stream; } set_sink(IByteSink * sink)49 void set_sink(IByteSink* sink) { sink_ = sink; } 50 51 protected: 52 IByteStream* stream_ = nullptr; 53 IByteSink* sink_ = nullptr; 54 }; 55 56 } // namespace snapshot 57 } // namespace android 58