1 // Copyright 2019 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 /////////////////////////////////////////////////////////////////////////////// 16 17 #ifndef TINK_STREAMINGAEAD_SHARED_RANDOM_ACCESS_STREAM_H_ 18 #define TINK_STREAMINGAEAD_SHARED_RANDOM_ACCESS_STREAM_H_ 19 20 #include "tink/random_access_stream.h" 21 #include "tink/util/buffer.h" 22 #include "tink/util/status.h" 23 #include "tink/util/statusor.h" 24 25 namespace crypto { 26 namespace tink { 27 namespace streamingaead { 28 29 // A RandomAccessStream that wraps another RandomAccessStream 30 // as a non-owned pointer. 31 // The wrapper forwards all calls to the wrapped RandomAccessStream, 32 // which must remain alive as long as as the wrapper is in use. 33 class SharedRandomAccessStream : public crypto::tink::RandomAccessStream { 34 public: 35 // Constructs an RandomAccessStream that wraps 'random_access_stream', 36 // and will forward all the method calls to this wrapped stream. SharedRandomAccessStream(crypto::tink::RandomAccessStream * random_access_stream)37 explicit SharedRandomAccessStream( 38 crypto::tink::RandomAccessStream* random_access_stream) 39 : random_access_stream_(random_access_stream) {} 40 41 ~SharedRandomAccessStream() override = default; 42 PRead(int64_t position,int count,crypto::tink::util::Buffer * dest_buffer)43 crypto::tink::util::Status PRead( 44 int64_t position, int count, 45 crypto::tink::util::Buffer* dest_buffer) override { 46 return random_access_stream_->PRead(position, count, dest_buffer); 47 } 48 size()49 crypto::tink::util::StatusOr<int64_t> size() override { 50 return random_access_stream_->size(); 51 } 52 53 private: 54 crypto::tink::RandomAccessStream* random_access_stream_; 55 }; 56 57 } // namespace streamingaead 58 } // namespace tink 59 } // namespace crypto 60 61 #endif // TINK_STREAMINGAEAD_SHARED_RANDOM_ACCESS_STREAM_H_ 62