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PIFMap.h
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1997-10-19
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/*____________________________________________________________________________*\
*
Copyright (c) 1997 John Roy. All rights reserved.
These sources, libraries and applications are
FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
as long as the following conditions are adhered to.
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.
3. Redistributions of any form whatsoever and all advertising materials
mentioning features must contain the following
acknowledgment:
"This product includes software developed by John Roy
(http://www.johnroy.com/pi3/)."
THIS SOFTWARE IS PROVIDED ``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 THE AUTHORS OR ITS 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.
*____________________________________________________________________________*|
*
* $Source: PIFMap.h$
* $Date: Sun Aug 10 06:29:37 1997$
*
Description:
\*____________________________________________________________________________*/
/* $HeaderTop:$ */
#ifndef PIFMAP_H_
#define PIFMAP_H_
#include "PiAPI.h"
/*____________________________________________________________________________*\
*
Typedefs:
\*____________________________________________________________________________*/
typedef struct MappedFile PIFMap;
/*____________________________________________________________________________*\
*
Name:
PIFMap_new
Synopsis:
PIFMap *PIFMap_new( const PIFInfo *pFileInfo )
Description:
Create a new mapped file object to map a file into virtual
memory.
Notes:
The mapped file object should be destroyed using PIFMap_delete()
when it is no longer needed.
Return Values:
On success PIFInfo returns a pointer to a new mapped file object.
Errors:
If pFileInfo is NULL or memory cannot be allocated PIFMap_new() will
return NULL.
More specific error information can be retrieved using
PIPlatform_getLastError().
See Also:
PIFMap_delete().
\*____________________________________________________________________________*/
PUBLIC_PIAPI PIFMap *PIFMap_new( const PIFInfo *pFileInfo );
/*____________________________________________________________________________*\
*
Name:
PIFMap_delete
Synopsis:
int PIFMap_delete( PIFMap *pMappedFile )
Description:
Destroys and free memory associated with the mapped file object
pMappedFile.
Notes:
Return Values:
On success PIFMap_delete() returns zero (PIAPI_COMPLETED).
Errors:
On error PIFMap_delete() returns a negative value.
More specific error information can be retrieved using
PIPlatform_getLastError().
See Also:
PIFMap_new()
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIFMap_delete( PIFMap *pMappedFile );
/*____________________________________________________________________________*\
*
Name:
PIFMap_lock
Synopsis:
void *PIFMap_lock( PIFMap *pMappedFile, int *piLength )
Description:
Locks a mapped file object in memory and returns a pointer
to the first byte. If piLength is not NULL the length of
the mapped file will be written in the location it points at.
Notes:
PIFMap_lock() maps the file in read only mode. When the address
of the file map is no longer needed the mapped file object should
be unlocked using PIFMap_unlock(). PIFMap_lock() and PIFMap_unlock()
may be invoked any number of times in order.
Return Values:
On success PIFMap_lock() returns a pointer to a memory address where
the file has been mapped.
Errors:
PIFMap_lock() returns NULL if pMappedFile is NULL or an error
occurred.
More specific error information can be retrieved using
PIPlatform_getLastError().
See Also:
PIFMap_unlock().
\*____________________________________________________________________________*/
PUBLIC_PIAPI void *PIFMap_lock( PIFMap *pMappedFile, int *piLength );
/*____________________________________________________________________________*\
*
Name:
PIFMap_unlock
Synopsis:
int PIFMap_unlock( PIFMap *pMappedFile )
Description:
Unlocks the mapped file object pMappedFile. This invalidates any
memory pointer obtained from PIFMap_lock().
Notes:
The use of lock and unlock on a file mapping object allows some operating
systems to more efficiently manage system resources.
It is an error to invoke PIFMap_unlock() on a file mapping object
that has not been locked with PIFMap_lock().
Return Values:
On success PIFMap_unlock() returns zero (PIAPI_COMPLETED).
Errors:
On error PIFMap_unlock() returns a negative value.
More specific error information can be retrieved using
PIPlatform_getLastError().
See Also:
PIFMap_lock().
\*____________________________________________________________________________*/
PUBLIC_PIAPI int PIFMap_unlock( PIFMap *pMappedFile );
#endif /* PIFMAP_H_ */