--- /dev/null
+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2002, 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.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+#ifndef INCLUDED_IMF_IO_H
+#define INCLUDED_IMF_IO_H
+
+//-----------------------------------------------------------------------------
+//
+// Low-level file input and output for OpenEXR.
+//
+//-----------------------------------------------------------------------------
+
+#include <ImfInt64.h>
+#include <string>
+
+namespace Imf {
+
+//-----------------------------------------------------------
+// class IStream -- an abstract base class for input streams.
+//-----------------------------------------------------------
+
+class IStream
+{
+ public:
+
+ //-----------
+ // Destructor
+ //-----------
+
+ virtual ~IStream ();
+
+
+ //-------------------------------------------------
+ // Does this input stream support memory-mapped IO?
+ //
+ // Memory-mapped streams can avoid an extra copy;
+ // memory-mapped read operations return a pointer
+ // to an internal buffer instead of copying data
+ // into a buffer supplied by the caller.
+ //-------------------------------------------------
+
+ virtual bool isMemoryMapped () const;
+
+
+ //------------------------------------------------------
+ // Read from the stream:
+ //
+ // read(c,n) reads n bytes from the stream, and stores
+ // them in array c. If the stream contains less than n
+ // bytes, or if an I/O error occurs, read(c,n) throws
+ // an exception. If read(c,n) reads the last byte from
+ // the file it returns false, otherwise it returns true.
+ //------------------------------------------------------
+
+ virtual bool read (char c[/*n*/], int n) = 0;
+
+
+ //---------------------------------------------------
+ // Read from a memory-mapped stream:
+ //
+ // readMemoryMapped(n) reads n bytes from the stream
+ // and returns a pointer to the first byte. The
+ // returned pointer remains valid until the stream
+ // is closed. If there are less than n byte left to
+ // read in the stream or if the stream is not memory-
+ // mapped, readMemoryMapped(n) throws an exception.
+ //---------------------------------------------------
+
+ virtual char * readMemoryMapped (int n);
+
+
+ //--------------------------------------------------------
+ // Get the current reading position, in bytes from the
+ // beginning of the file. If the next call to read() will
+ // read the first byte in the file, tellg() returns 0.
+ //--------------------------------------------------------
+
+ virtual Int64 tellg () = 0;
+
+
+ //-------------------------------------------
+ // Set the current reading position.
+ // After calling seekg(i), tellg() returns i.
+ //-------------------------------------------
+
+ virtual void seekg (Int64 pos) = 0;
+
+
+ //------------------------------------------------------
+ // Clear error conditions after an operation has failed.
+ //------------------------------------------------------
+
+ virtual void clear ();
+
+
+ //------------------------------------------------------
+ // Get the name of the file associated with this stream.
+ //------------------------------------------------------
+
+ const char * fileName () const;
+
+ protected:
+
+ IStream (const char fileName[]);
+
+ private:
+
+ IStream (const IStream &); // not implemented
+ IStream & operator = (const IStream &); // not implemented
+
+ std::string _fileName;
+};
+
+
+//-----------------------------------------------------------
+// class OStream -- an abstract base class for output streams
+//-----------------------------------------------------------
+
+class OStream
+{
+ public:
+
+ //-----------
+ // Destructor
+ //-----------
+
+ virtual ~OStream ();
+
+
+ //----------------------------------------------------------
+ // Write to the stream:
+ //
+ // write(c,n) takes n bytes from array c, and stores them
+ // in the stream. If an I/O error occurs, write(c,n) throws
+ // an exception.
+ //----------------------------------------------------------
+
+ virtual void write (const char c[/*n*/], int n) = 0;
+
+
+ //---------------------------------------------------------
+ // Get the current writing position, in bytes from the
+ // beginning of the file. If the next call to write() will
+ // start writing at the beginning of the file, tellp()
+ // returns 0.
+ //---------------------------------------------------------
+
+ virtual Int64 tellp () = 0;
+
+
+ //-------------------------------------------
+ // Set the current writing position.
+ // After calling seekp(i), tellp() returns i.
+ //-------------------------------------------
+
+ virtual void seekp (Int64 pos) = 0;
+
+
+ //------------------------------------------------------
+ // Get the name of the file associated with this stream.
+ //------------------------------------------------------
+
+ const char * fileName () const;
+
+ protected:
+
+ OStream (const char fileName[]);
+
+ private:
+
+ OStream (const OStream &); // not implemented
+ OStream & operator = (const OStream &); // not implemented
+
+ std::string _fileName;
+};
+
+
+//-----------------------
+// Helper classes for Xdr
+//-----------------------
+
+struct StreamIO
+{
+ static void
+ writeChars (OStream &os, const char c[/*n*/], int n)
+ {
+ os.write (c, n);
+ }
+
+ static bool
+ readChars (IStream &is, char c[/*n*/], int n)
+ {
+ return is.read (c, n);
+ }
+};
+
+
+struct CharPtrIO
+{
+ static void
+ writeChars (char *&op, const char c[/*n*/], int n)
+ {
+ while (n--)
+ *op++ = *c++;
+ }
+
+ static bool
+ readChars (const char *&ip, char c[/*n*/], int n)
+ {
+ while (n--)
+ *c++ = *ip++;
+
+ return true;
+ }
+};
+
+
+} // namespace Imf
+
+#endif
projects / opencv / blobdiff