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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** FileX Component */
/** */
/** Utility */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#ifdef FX_ENABLE_EXFAT
#include "fx_system.h"
#include "fx_media.h"
#include "fx_utility.h"
#include "fx_directory_exFAT.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_utility_exFAT_bitmap_cache_prepare PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks if the bitmap for specified cluster is in */
/* cache. If not, it will read the bitmap portion to cache. */
/* */
/* INPUT */
/* */
/* media_ptr Media control block pointer */
/* cluster Cluster number */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* _fx_utility_exFAT_bitmap_flush Flush bitmap cache */
/* _fx_utility_exFAT_bitmap_cache_update Read bitmap to cache */
/* */
/* CALLED BY */
/* */
/* FileX System Functions */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _fx_utility_exFAT_bitmap_cache_prepare(FX_MEDIA *media_ptr, ULONG cluster)
{
UINT status;
/* Default the status to no more space. */
status = FX_NO_MORE_SPACE;
/* Make sure the cluster does not exceed the total count. */
if (cluster < media_ptr -> fx_media_total_clusters + FX_FAT_ENTRY_START)
{
/* Check if the request cluster is already cached. */
if ((cluster >= media_ptr -> fx_media_exfat_bitmap_cache_start_cluster) &&
(cluster <= media_ptr -> fx_media_exfat_bitmap_cache_end_cluster))
{
/* Cluster already cached. */
status = FX_SUCCESS;
}
else
{
/* Need to Cache update. */
/* Flush previous cached data if required. */
if (FX_SUCCESS == (status = _fx_utility_exFAT_bitmap_flush(media_ptr)))
{
/* Call utility function to update cache. */
status = _fx_utility_exFAT_bitmap_cache_update(media_ptr, cluster);
}
}
}
/* Return status. */
return(status);
}
#endif /* FX_ENABLE_EXFAT */
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