iostream.h (2566B)
1 // Copyright (c) 2014 Sandstorm Development Group, Inc. and contributors 2 // Licensed under the MIT License: 3 // 4 // Permission is hereby granted, free of charge, to any person obtaining a copy 5 // of this software and associated documentation files (the "Software"), to deal 6 // in the Software without restriction, including without limitation the rights 7 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 // copies of the Software, and to permit persons to whom the Software is 9 // furnished to do so, subject to the following conditions: 10 // 11 // The above copyright notice and this permission notice shall be included in 12 // all copies or substantial portions of the Software. 13 // 14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 20 // THE SOFTWARE. 21 22 /* 23 * Compatibility layer for stdlib iostream 24 */ 25 26 #pragma once 27 28 #include "../io.h" 29 #include <iostream> 30 31 KJ_BEGIN_HEADER 32 33 namespace kj { 34 namespace std { 35 36 class StdOutputStream: public kj::OutputStream { 37 38 public: 39 explicit StdOutputStream(::std::ostream& stream) : stream_(stream) {} 40 ~StdOutputStream() noexcept(false) {} 41 42 virtual void write(const void* src, size_t size) override { 43 // Always writes the full size. 44 45 stream_.write((char*)src, size); 46 } 47 48 virtual void write(ArrayPtr<const ArrayPtr<const byte>> pieces) override { 49 // Equivalent to write()ing each byte array in sequence, which is what the 50 // default implementation does. Override if you can do something better, 51 // e.g. use writev() to do the write in a single syscall. 52 53 for (auto piece : pieces) { 54 write(piece.begin(), piece.size()); 55 } 56 } 57 58 private: 59 ::std::ostream& stream_; 60 61 }; 62 63 class StdInputStream: public kj::InputStream { 64 65 public: 66 explicit StdInputStream(::std::istream& stream) : stream_(stream) {} 67 ~StdInputStream() noexcept(false) {} 68 69 virtual size_t tryRead( 70 void* buffer, size_t minBytes, size_t maxBytes) override { 71 // Like read(), but may return fewer than minBytes on EOF. 72 73 stream_.read((char*)buffer, maxBytes); 74 return stream_.gcount(); 75 } 76 77 private: 78 ::std::istream& stream_; 79 80 }; 81 82 } // namespace std 83 } // namespace kj 84 85 KJ_END_HEADER