1// Copyright 2011 Google Inc. 2// All rights reserved. 3// 4// Redistribution and use in source and binary forms, with or without 5// modification, are permitted provided that the following conditions are 6// met: 7// 8// * Redistributions of source code must retain the above copyright 9// notice, this list of conditions and the following disclaimer. 10// * Redistributions in binary form must reproduce the above copyright 11// notice, this list of conditions and the following disclaimer in the 12// documentation and/or other materials provided with the distribution. 13// * Neither the name of Google Inc. nor the names of its contributors 14// may be used to endorse or promote products derived from this software 15// without specific prior written permission. 16// 17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29#include "utils/stream.hpp" 30 31#include <istream> 32#include <sstream> 33 34#include "utils/format/macros.hpp" 35#include "utils/sanity.hpp" 36 37 38/// Gets the length of a stream. 39/// 40/// \param is The input stream for which to calculate its length. 41/// 42/// \return The length of the stream. This is of size_t type instead of 43/// directly std::streampos to simplify the caller. Some systems do not 44/// support comparing a std::streampos directly to an integer (see 45/// NetBSD 1.5.x), which is what we often want to do. 46/// 47/// \throw std::exception If calculating the length fails due to a stream error. 48std::size_t 49utils::stream_length(std::istream& is) 50{ 51 const std::streampos current_pos = is.tellg(); 52 try { 53 is.seekg(0, std::ios::end); 54 const std::streampos length = is.tellg(); 55 is.seekg(current_pos, std::ios::beg); 56 return static_cast< std::size_t >(length); 57 } catch (...) { 58 is.seekg(current_pos, std::ios::beg); 59 throw; 60 } 61} 62 63 64/// Reads the whole contents of a stream into memory. 65/// 66/// \param input The input stream from which to read. 67/// 68/// \return A plain string containing the raw contents of the file. 69std::string 70utils::read_stream(std::istream& input) 71{ 72 std::ostringstream buffer; 73 74 char tmp[1024]; 75 while (input.good()) { 76 input.read(tmp, sizeof(tmp)); 77 if (input.good() || input.eof()) { 78 buffer.write(tmp, input.gcount()); 79 } 80 } 81 82 return buffer.str(); 83} 84