1/////////////////////////////////////////////////////////////////////////// 2// 3// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas 4// Digital Ltd. LLC 5// 6// All rights reserved. 7// 8// Redistribution and use in source and binary forms, with or without 9// modification, are permitted provided that the following conditions are 10// met: 11// * Redistributions of source code must retain the above copyright 12// notice, this list of conditions and the following disclaimer. 13// * Redistributions in binary form must reproduce the above 14// copyright notice, this list of conditions and the following disclaimer 15// in the documentation and/or other materials provided with the 16// distribution. 17// * Neither the name of Industrial Light & Magic nor the names of 18// its contributors may be used to endorse or promote products derived 19// from this software without specific prior written permission. 20// 21// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32// 33/////////////////////////////////////////////////////////////////////////// 34 35 36//----------------------------------------------------------------------------- 37// 38// Low-level file input and output for OpenEXR 39// based on C++ standard iostreams. 40// 41//----------------------------------------------------------------------------- 42 43#include <ImfStdIO.h> 44#include "Iex.h" 45#include <errno.h> 46 47using namespace std; 48 49namespace Imf { 50namespace { 51 52void 53clearError () 54{ 55 errno = 0; 56} 57 58 59bool 60checkError (istream &is) 61{ 62 if (!is) 63 { 64 if (errno) 65 Iex::throwErrnoExc(); 66 return false; 67 } 68 69 return true; 70} 71 72 73void 74checkError (ostream &os) 75{ 76 if (!os) 77 { 78 if (errno) 79 Iex::throwErrnoExc(); 80 81 throw Iex::ErrnoExc ("File output failed."); 82 } 83} 84 85} // namespace 86 87 88StdIFStream::StdIFStream (const char fileName[]): 89 IStream (fileName), 90 _is (new ifstream (fileName, ios_base::binary)), 91 _deleteStream (true) 92{ 93 if (!*_is) 94 { 95 delete _is; 96 Iex::throwErrnoExc(); 97 } 98} 99 100 101StdIFStream::StdIFStream (ifstream &is, const char fileName[]): 102 IStream (fileName), 103 _is (&is), 104 _deleteStream (false) 105{ 106 // empty 107} 108 109 110StdIFStream::~StdIFStream () 111{ 112 if (_deleteStream) 113 delete _is; 114} 115 116 117bool 118StdIFStream::read (char c[/*n*/], int n) 119{ 120 if (!*_is) 121 throw Iex::InputExc ("Unexpected end of file."); 122 123 clearError(); 124 _is->read (c, n); 125 return checkError (*_is); 126} 127 128 129Int64 130StdIFStream::tellg () 131{ 132 return std::streamoff (_is->tellg()); 133} 134 135 136void 137StdIFStream::seekg (Int64 pos) 138{ 139 _is->seekg (pos); 140 checkError (*_is); 141} 142 143 144void 145StdIFStream::clear () 146{ 147 _is->clear(); 148} 149 150 151StdOFStream::StdOFStream (const char fileName[]): 152 OStream (fileName), 153 _os (new ofstream (fileName, ios_base::binary)), 154 _deleteStream (true) 155{ 156 if (!*_os) 157 { 158 delete _os; 159 Iex::throwErrnoExc(); 160 } 161} 162 163 164StdOFStream::StdOFStream (ofstream &os, const char fileName[]): 165 OStream (fileName), 166 _os (&os), 167 _deleteStream (false) 168{ 169 // empty 170} 171 172 173StdOFStream::~StdOFStream () 174{ 175 if (_deleteStream) 176 delete _os; 177} 178 179 180void 181StdOFStream::write (const char c[/*n*/], int n) 182{ 183 clearError(); 184 _os->write (c, n); 185 checkError (*_os); 186} 187 188 189Int64 190StdOFStream::tellp () 191{ 192 return std::streamoff (_os->tellp()); 193} 194 195 196void 197StdOFStream::seekp (Int64 pos) 198{ 199 _os->seekp (pos); 200 checkError (*_os); 201} 202 203 204StdOSStream::StdOSStream (): OStream ("(string)") 205{ 206 // empty 207} 208 209 210void 211StdOSStream::write (const char c[/*n*/], int n) 212{ 213 clearError(); 214 _os.write (c, n); 215 checkError (_os); 216} 217 218 219Int64 220StdOSStream::tellp () 221{ 222 return std::streamoff (_os.tellp()); 223} 224 225 226void 227StdOSStream::seekp (Int64 pos) 228{ 229 _os.seekp (pos); 230 checkError (_os); 231} 232 233 234} // namespace Imf 235