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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 */
/** */
/** Fault Tolerant */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
#include "fx_api.h"
#include "fx_utility.h"
#include "fx_fault_tolerant.h"
#if defined(FX_ENABLE_FAULT_TOLERANT) && defined(FX_ENABLE_EXFAT)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_fault_tolerant_add_checksum_log PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function converts checksum of exFAT directory entry write into */
/* log entries and add it into log file. */
/* */
/* INPUT */
/* */
/* media_ptr Media control block pointer */
/* logical_sector Original sector to write to */
/* offset Offset in original sector */
/* checksum Value of checksum */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* _fx_utility_16_unsigned_read Read a USHORT from memory */
/* _fx_utility_32_unsigned_read Read a ULONG from memory */
/* _fx_utility_64_unsigned_read Read a ULONG64 from memory */
/* _fx_utility_16_unsigned_write Write a USHORT from memory */
/* memcpy Memory Copy */
/* */
/* CALLED BY */
/* */
/* _fx_directory_exFAT_unicode_entry_write */
/* */
/* 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_fault_tolerant_add_checksum_log(FX_MEDIA *media_ptr, ULONG64 logical_sector, ULONG offset, USHORT checksum)
{
ULONG logs_remaining;
UCHAR *current_ptr;
ULONG size;
USHORT type;
ULONG log_len;
ULONG64 log_sector;
ULONG log_offset;
FX_FAULT_TOLERANT_DIR_LOG *dir_log;
/* Get fault tolerant data. */
logs_remaining = media_ptr -> fx_media_fault_tolerant_total_logs;
/* Get size of all logs. */
size = media_ptr -> fx_media_fault_tolerant_file_size - FX_FAULT_TOLERANT_LOG_CONTENT_OFFSET;
/* Get the first log pointer. */
current_ptr = media_ptr -> fx_media_fault_tolerant_memory_buffer +
FX_FAULT_TOLERANT_LOG_CONTENT_OFFSET +
FX_FAULT_TOLERANT_LOG_CONTENT_HEADER_SIZE;
/* Loop throught all DIR logs. */
while (logs_remaining)
{
/* Check log type. */
type = (USHORT)_fx_utility_16_unsigned_read(current_ptr);
/* Get log length. */
log_len = _fx_utility_16_unsigned_read(current_ptr + 2);
/* Validate the size value. */
if (log_len > size)
{
/* Log file is corrupted. Nothing can be done. Return.*/
return(FX_FILE_CORRUPT);
}
size -= log_len;
/* Check log type. */
if (type == FX_FAULT_TOLERANT_DIR_LOG_TYPE)
{
/* Set the log pointer. */
dir_log = (FX_FAULT_TOLERANT_DIR_LOG *)current_ptr;
/* Get the sector of log. */
log_sector = _fx_utility_64_unsigned_read((UCHAR *)&dir_log -> fx_fault_tolerant_dir_log_sector);
/* Get the offset of log. */
log_offset = _fx_utility_32_unsigned_read((UCHAR *)&dir_log -> fx_fault_tolerant_dir_log_offset);
/* Is the checksum for this directory log? */
if ((log_sector == logical_sector) && (offset == log_offset + 2))
{
/* Yes. Update the checksum field. */
_fx_utility_16_unsigned_write(current_ptr + FX_FAULT_TOLERANT_DIR_LOG_ENTRY_SIZE + 2, checksum);
/* Return success. */
return(FX_SUCCESS);
}
}
/* Decrease the logs_remaining counter. */
logs_remaining--;
/* Move to start position of next log entry. */
current_ptr += log_len;
}
/* The directory is not found. Log file is corrupted. */
return(FX_FILE_CORRUPT);
}
#endif /* FX_ENABLE_FAULT_TOLERANT && FX_ENABLE_EXFAT */
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