/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
 * Copyright (c) 2006-2007 Carnegie Mellon University.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. 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.
 *
 * This work was supported in part by funding from the Defense Advanced 
 * Research Projects Agency and the National Science Foundation of the 
 * United States of America, and the CMU Sphinx Speech Consortium.
 *
 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
 * ANY EXPRESSED 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 CARNEGIE MELLON UNIVERSITY
 * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * ====================================================================
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 */
/**
 * @file mmio.h 
 * @brief Memory-mapped I/O wrappers for files.
 * @author David Huggins-Daines <dhuggins@cs.cmu.edu>
 **/

#ifndef __MMIO_H__
#define __MMIO_H__


#ifdef __cplusplus
extern "C" {
#endif
#if 0
/* Fool Emacs. */
}
#endif

/**
 * Abstract structure representing a memory-mapped file.
 **/
typedef struct mmio_file_s mmio_file_t;

/**
 * Memory-map a file for reading.
 * @return a mmio_file_t * or NULL for failure.
 **/
SPHINXBASE_EXPORT
mmio_file_t *mmio_file_read(const char *filename);

/**
 * Get a pointer to the memory mapped for a file.
 **/
SPHINXBASE_EXPORT
void *mmio_file_ptr(mmio_file_t *mf);

/**
 * Unmap a file, releasing memory associated with it.
 **/
SPHINXBASE_EXPORT
void mmio_file_unmap(mmio_file_t *mf);

#ifdef __cplusplus
}
#endif


#endif /* __MMIO_H__ */
