241 lines
4.5 KiB
C++
241 lines
4.5 KiB
C++
///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
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// Digital Ltd. LLC
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Industrial Light & Magic nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.67
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//
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///////////////////////////////////////////////////////////////////////////
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//-----------------------------------------------------------------------------
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//
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// Low-level file input and output for OpenEXR
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// based on C++ standard iostreams.
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//
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//-----------------------------------------------------------------------------
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#include <ImfStdIO.h>
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#include "Iex.h"
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#include <errno.h>
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using namespace std;
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namespace Imf {
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namespace {
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void
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clearError ()
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{
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errno = 0;
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}
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bool
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checkError (istream &is, streamsize expected = 0)
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{
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if (!is)
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{
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if (errno)
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Iex::throwErrnoExc();
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if (is.gcount() < expected)
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{
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THROW (Iex::InputExc, "Early end of file: read " << is.gcount()
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<< " out of " << expected << " requested bytes.");
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}
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return false;
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}
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return true;
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}
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void
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checkError (ostream &os)
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{
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if (!os)
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{
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if (errno)
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Iex::throwErrnoExc();
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throw Iex::ErrnoExc ("File output failed.");
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}
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}
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} // namespace
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StdIFStream::StdIFStream (const char fileName[]):
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IStream (fileName),
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_is (new ifstream (fileName, ios_base::binary)),
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_deleteStream (true)
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{
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if (!*_is)
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{
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delete _is;
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Iex::throwErrnoExc();
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}
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}
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StdIFStream::StdIFStream (ifstream &is, const char fileName[]):
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IStream (fileName),
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_is (&is),
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_deleteStream (false)
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{
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// empty
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}
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StdIFStream::~StdIFStream ()
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{
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if (_deleteStream)
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delete _is;
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}
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bool
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StdIFStream::read (char c[/*n*/], int n)
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{
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if (!*_is)
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throw Iex::InputExc ("Unexpected end of file.");
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clearError();
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_is->read (c, n);
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return checkError (*_is, n);
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}
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Int64
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StdIFStream::tellg ()
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{
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return std::streamoff (_is->tellg());
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}
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void
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StdIFStream::seekg (Int64 pos)
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{
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_is->seekg (pos);
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checkError (*_is);
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}
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void
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StdIFStream::clear ()
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{
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_is->clear();
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}
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StdOFStream::StdOFStream (const char fileName[]):
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OStream (fileName),
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_os (new ofstream (fileName, ios_base::binary)),
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_deleteStream (true)
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{
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if (!*_os)
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{
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delete _os;
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Iex::throwErrnoExc();
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}
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}
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StdOFStream::StdOFStream (ofstream &os, const char fileName[]):
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OStream (fileName),
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_os (&os),
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_deleteStream (false)
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{
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// empty
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}
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StdOFStream::~StdOFStream ()
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{
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if (_deleteStream)
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delete _os;
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}
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void
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StdOFStream::write (const char c[/*n*/], int n)
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{
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clearError();
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_os->write (c, n);
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checkError (*_os);
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}
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Int64
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StdOFStream::tellp ()
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{
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return std::streamoff (_os->tellp());
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}
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void
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StdOFStream::seekp (Int64 pos)
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{
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_os->seekp (pos);
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checkError (*_os);
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}
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StdOSStream::StdOSStream (): OStream ("(string)")
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{
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// empty
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}
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void
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StdOSStream::write (const char c[/*n*/], int n)
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{
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clearError();
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_os.write (c, n);
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checkError (_os);
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}
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Int64
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StdOSStream::tellp ()
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{
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return std::streamoff (_os.tellp());
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}
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void
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StdOSStream::seekp (Int64 pos)
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{
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_os.seekp (pos);
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checkError (_os);
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}
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} // namespace Imf
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