1 // Copyright 2015 The Android Open Source Project 2 // 3 // This software is licensed under the terms of the GNU General Public 4 // License version 2, as published by the Free Software Foundation, and 5 // may be copied, distributed, and modified under those terms. 6 // 7 // This program is distributed in the hope that it will be useful, 8 // but WITHOUT ANY WARRANTY; without even the implied warranty of 9 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 // GNU General Public License for more details. 11 12 #include "android/base/files/MemStream.h" 13 14 #include "android/base/files/StreamSerializing.h" 15 16 #include <algorithm> 17 #include <utility> 18 19 namespace android { 20 namespace base { 21 22 MemStream::MemStream(int reserveSize) { 23 mData.reserve(reserveSize); 24 } 25 26 MemStream::MemStream(Buffer&& data) : mData(std::move(data)) {} 27 28 ssize_t MemStream::read(void* buffer, size_t size) { 29 const auto sizeToRead = std::min<int>(size, readSize()); 30 memcpy(buffer, mData.data() + mReadPos, sizeToRead); 31 mReadPos += sizeToRead; 32 return sizeToRead; 33 } 34 35 ssize_t MemStream::write(const void* buffer, size_t size) { 36 mData.insert(mData.end(), (const char*)buffer, (const char*)buffer + size); 37 return size; 38 } 39 40 int MemStream::writtenSize() const { 41 return (int)mData.size(); 42 } 43 44 int MemStream::readPos() const { 45 return mReadPos; 46 } 47 48 int MemStream::readSize() const { 49 return mData.size() - mReadPos; 50 } 51 52 void MemStream::save(Stream* stream) const { 53 saveBuffer(stream, mData); 54 } 55 56 void MemStream::load(Stream* stream) { 57 loadBuffer(stream, &mData); 58 mReadPos = 0; 59 } 60 61 } // namespace base 62 } // namespace android 63
