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cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfStdIO.cpp

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