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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 */
/** */
/** Directory */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#ifdef FX_ENABLE_EXFAT
#include "fx_utility.h"
#include "fx_directory_exFAT.h"
#include "fx_directory.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_directory_exFAT_entry_read PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function reads the supplied directory entry from the supplied */
/* source directory. If the supplied directory entry is NULL, then */
/* the root directory is assumed. */
/* */
/* INPUT */
/* */
/* media_ptr Media control block pointer */
/* source_dir Source directory entry */
/* entry_ptr Directory entry number */
/* destination_ptr Pointer to destination for */
/* the directory entry */
/* hash Hash value of the file name */
/* skip Skip reading file name */
/* unicode_name Destination for unicode name */
/* unicode_length Destination for unicode name */
/* length */
/* */
/* OUTPUT */
/* */
/* return status */
/* *entry_ptr should point to the 8:3 entry if it is a long name */
/* */
/* CALLS */
/* */
/* _fx_utility_FAT_entry_read Read a FAT entry */
/* _fx_utility_logical_sector_read Read directory sector */
/* _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 */
/* */
/* CALLED BY */
/* */
/* _fx_directory_entry_read */
/* _fx_directory_free_search */
/* _fx_directory_next_full_entry_find */
/* */
/* 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_directory_exFAT_entry_read(FX_MEDIA *media_ptr, FX_DIR_ENTRY *source_dir,
ULONG *entry_ptr, FX_DIR_ENTRY *destination_ptr,
UINT hash, UINT skip, UCHAR *unicode_name, UINT *unicode_length)
{
UINT status = FX_SUCCESS;
UCHAR i;
UCHAR j;
ULONG cluster = 0, next_cluster = 0;
ULONG64 next_logical_sector;
UINT relative_cluster;
UINT relative_sector = 0;
ULONG64 logical_sector;
ULONG byte_offset;
ULONG bytes_per_cluster;
UCHAR *read_ptr;
UCHAR secondary_count;
UCHAR name_length = 0;
UCHAR name_pos = 0;
UCHAR copy_size = 0;
USHORT checksum = 0;
USHORT file_checksum;
ULONG date_time;
UCHAR dont_use_fat;
ULONG clusters_count = 0;
/* Calculate the byte offset of this directory entry. */
byte_offset = (*entry_ptr) * FX_DIR_ENTRY_SIZE;
/* Calculate the number of bytes per cluster. */
bytes_per_cluster = ((ULONG)media_ptr -> fx_media_bytes_per_sector) *
((ULONG)media_ptr -> fx_media_sectors_per_cluster);
/* Now determine the relative cluster in the sub-directory file. */
relative_cluster = (UINT)(byte_offset / bytes_per_cluster);
/* Calculate the byte offset within the cluster. */
byte_offset = byte_offset % bytes_per_cluster;
/* Now figure out the relative sector within the cluster. */
relative_sector = (UINT)(byte_offset / ((ULONG)media_ptr -> fx_media_bytes_per_sector));
/* Read the directory sector into the internal memory buffer. */
/* Determine if there is a sub-directory. */
if (source_dir)
{
/* Yes, setup the starting cluster to that of the sub-directory. */
cluster = source_dir -> fx_dir_entry_cluster;
/* Save the cluster count for the directory entry. */
clusters_count = (ULONG)((source_dir -> fx_dir_entry_file_size + bytes_per_cluster - 1) / bytes_per_cluster - 1);
}
else
{
/* No, setup the starting cluster to the exFAT root directory cluster. */
cluster = media_ptr -> fx_media_root_cluster_32;
}
/* Loop to position to the appropriate cluster. */
for (i = 0;; i++)
{
/* Check the value of the new cluster - it must be a valid cluster number
or something is really wrong! */
if ((cluster < FX_FAT_ENTRY_START) || (cluster > FX_RESERVED_1_exFAT))
{
/* Send error message back to caller. */
return(FX_FILE_CORRUPT);
}
/* Read the next cluster. First check if FAT is used. */
if ((source_dir) && (source_dir -> fx_dir_entry_dont_use_fat & 1))
{
/* FAT is not used. Check for file size range. */
if (i >= clusters_count)
{
/* We are at the last cluster, set next cluster to LAST CLUSTER. */
next_cluster = FX_LAST_CLUSTER_exFAT;
}
else
{
/* The next cluster is just after the current cluster. */
next_cluster = cluster + 1;
}
}
else
{
/* FAT is used, call FAT read function to get the next cluster. */
status = _fx_utility_FAT_entry_read(media_ptr, cluster, &next_cluster);
/* Check for I/O error. */
if (status != FX_SUCCESS)
{
/* Return error code. */
return(status);
}
}
/* Are we positioned to the appropriate cluster? */
if (i < relative_cluster)
{
cluster = next_cluster;
}
else
{
break;
}
}
/* At this point, the directory data sector needs to be read. */
logical_sector = ((ULONG)media_ptr -> fx_media_data_sector_start) +
(((ULONG64)cluster - FX_FAT_ENTRY_START) *
((ULONG)media_ptr -> fx_media_sectors_per_cluster)) +
relative_sector;
/* Determine if next sector is in next cluster or in next sector. */
if ((bytes_per_cluster - byte_offset) >= (ULONG)media_ptr -> fx_media_bytes_per_sector)
{
/* Move to the next logical sector. */
next_logical_sector = logical_sector + 1;
}
else
{
/* No, calculate the next logical sector. */
if ((next_cluster >= FX_FAT_ENTRY_START) && (next_cluster <= FX_RESERVED_1_exFAT))
{
next_logical_sector = ((ULONG)media_ptr -> fx_media_data_sector_start) +
(((ULONG64)next_cluster - FX_FAT_ENTRY_START) * ((ULONG)media_ptr -> fx_media_sectors_per_cluster));
}
else
{
next_logical_sector = 0; /* No such sector possible. */
}
}
/* Read the logical directory sector. */
status = _fx_utility_logical_sector_read(media_ptr, ((ULONG64) logical_sector),
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_DIRECTORY_SECTOR);
/* Determine if an error occurred. */
if (status != FX_SUCCESS)
{
/* Return error code. */
return(status);
}
/* Calculate the byte offset within this sector. */
byte_offset = byte_offset % media_ptr -> fx_media_bytes_per_sector;
/* Setup a pointer into the buffer. */
read_ptr = (UCHAR *)media_ptr -> fx_media_memory_buffer + (UINT)byte_offset;
/* Save the logical sector and byte offset in the returned directory entry. */
destination_ptr -> fx_dir_entry_log_sector = logical_sector;
destination_ptr -> fx_dir_entry_next_log_sector = next_logical_sector;
destination_ptr -> fx_dir_entry_byte_offset = byte_offset;
/* Clear the short file name information. */
destination_ptr -> fx_dir_entry_long_name_shorted = 0;
destination_ptr -> fx_dir_entry_short_name[0] = 0;
/* Check if the directory entry type has InUse bit set, or if it is an end marker. */
if ((*read_ptr & FX_EXFAT_ENTRY_TYPE_IN_USE_MASK) || (*read_ptr == FX_EXFAT_DIR_ENTRY_TYPE_END_MARKER))
{
/* Set the directory entry type. */
destination_ptr -> fx_dir_entry_type = *read_ptr;
}
else
{
/* This is a free entry. */
destination_ptr -> fx_dir_entry_type = FX_EXFAT_DIR_ENTRY_TYPE_FREE;
}
/* Check if the entry is a file directory entry. */
if (destination_ptr -> fx_dir_entry_type != FX_EXFAT_DIR_ENTRY_TYPE_FILE_DIRECTORY)
{
/* The entry is not directory entry, check if we know the type. */
if ((destination_ptr -> fx_dir_entry_type == FX_EXFAT_DIR_ENTRY_TYPE_ALLOCATION_BITMAP) ||
(destination_ptr -> fx_dir_entry_type == FX_EXFAT_DIR_ENTRY_TYPE_UP_CASE_TABLE) ||
(destination_ptr -> fx_dir_entry_type == FX_EXFAT_DIR_ENTRY_TYPE_VOLUME_LABEL) ||
(destination_ptr -> fx_dir_entry_type == FX_EXFAT_DIR_ENTRY_TYPE_FREE) ||
(destination_ptr -> fx_dir_entry_type == FX_EXFAT_DIR_ENTRY_TYPE_END_MARKER))
{
/* Known critical primary or free, just skip it. */
return(FX_SUCCESS);
}
/* Check if the entry is unknown critical primary directory entry. */
if ((destination_ptr -> fx_dir_entry_type & (FX_EXFAT_ENTRY_TYPE_IMPORTANCE_MASK | FX_EXFAT_ENTRY_TYPE_CATEGORY_MASK)) == 0)
{
/* Yes, it is an unknown critical primary entry. Return error. */
return(FX_MEDIA_INVALID);
}
/* Just ignore. */
return(FX_SUCCESS);
}
/* Calculate checksum for file entry. */
for (j = 0; j < FX_DIR_ENTRY_SIZE; ++j)
{
/* Skip the checksum field. */
if ((j == 2) || (j == 3))
{
continue;
}
/* Calculate the checksum using the algorithm described in the specification. */
/* Right rotate the checksum by one bit position and add the data. */
checksum = (USHORT)(((checksum >> 1) | (checksum << 15)) + read_ptr[j]);
}
/* Read secondary count field. */
read_ptr++;
secondary_count = *read_ptr;
/* Validate the secondary count field. */
if (secondary_count < 2)
{
/* Something wrong, file entry should have at least 2 entries: stream and filename. */
return(FX_FILE_CORRUPT);
}
/* Save secondary count. */
destination_ptr -> fx_dir_entry_secondary_count = secondary_count;
/* exFAT has no short/long name concept, set long name present for compatibility. */
destination_ptr -> fx_dir_entry_long_name_present = 1;
/* Advance the pointer to the checksum field. */
read_ptr++;
/* Read checksum field. */
file_checksum = (USHORT)_fx_utility_16_unsigned_read(read_ptr);
read_ptr += 2;
/* Read FileAttributes field. */
destination_ptr -> fx_dir_entry_attributes = (UCHAR)_fx_utility_16_unsigned_read(read_ptr); /* The same order as FAT32 but more unused bits. */
/* Skip Reserved1. */
read_ptr += 4;
/* Read CreatedTimestamp field. */
date_time = _fx_utility_32_unsigned_read(read_ptr);
destination_ptr -> fx_dir_entry_created_time = date_time & 0xffff;
destination_ptr -> fx_dir_entry_created_date = date_time >> 16;
read_ptr += 4;
/* Read LastModifiedTimestamp. */
date_time = _fx_utility_32_unsigned_read(read_ptr);
destination_ptr -> fx_dir_entry_time = date_time & 0xffff;
destination_ptr -> fx_dir_entry_date = date_time >> 16;
read_ptr += 4;
/* Read LastAccessedTimestamp. */
date_time = _fx_utility_32_unsigned_read(read_ptr);
destination_ptr -> fx_dir_entry_last_accessed_date = date_time >> 16;
read_ptr += 4;
/* Read Create10msIncrement. */
destination_ptr -> fx_dir_entry_created_time_ms = *read_ptr;
read_ptr++;
/* LastModified10msIncrement field is currently ignored. */
read_ptr++;
/* CreateUtcOffset field is currently ignored. */
read_ptr++;
/* LastModifiedUtcOffset field is currently ignored. */
read_ptr++;
/* LastAccessedUtcOffset field is currently ignored. */
/* Process all the secondary directory entries. */
for (i = 0; i < secondary_count; ++i)
{
/* Determine if a new sector needs to be read. */
if (byte_offset + FX_DIR_ENTRY_SIZE >= media_ptr -> fx_media_bytes_per_sector)
{
/* Determine the next sector of the directory entry. */
if (relative_sector < (media_ptr -> fx_media_sectors_per_cluster - 1))
{
/* More sectors in this cluster. */
/* Simply increment the logical sector. */
logical_sector++;
/* Increment the relative sector. */
relative_sector++;
}
else
{
/* We need to move to the next cluster. */
/* Read the next cluster. First check if FAT is used. */
if ((source_dir) && (source_dir -> fx_dir_entry_dont_use_fat & 1))
{
/* FAT is not used. Check for file size range. */
if (relative_cluster >= clusters_count)
{
/* We are at the last cluster, set next cluster to LAST CLUSTER. */
next_cluster = FX_LAST_CLUSTER_exFAT;
}
else
{
/* The next cluster is just after the current cluster. */
next_cluster = cluster + 1;
}
}
else
{
/* FAT is used, call FAT read function to get the next cluster. */
status = _fx_utility_FAT_entry_read(media_ptr, cluster, &next_cluster);
/* Check for I/O error. */
if (status != FX_SUCCESS)
{
/* Return error code. */
return(status);
}
}
/* Copy next cluster to the current cluster. */
cluster = next_cluster;
/* Check the value of the new cluster - it must be a valid cluster number
or something is really wrong! */
if ((cluster < FX_FAT_ENTRY_START) || (cluster > FX_RESERVED_1_exFAT))
{
/* Send error message back to caller. */
return(FX_FILE_CORRUPT);
}
/* Now increment the relative cluster. */
relative_cluster++;
/* Setup the relative sector (this is zero for subsequent cluster. */
relative_sector = 0;
/* Calculate the next logical sector. */
logical_sector = ((ULONG)media_ptr -> fx_media_data_sector_start) +
(((ULONG64)cluster - FX_FAT_ENTRY_START) *
((ULONG)media_ptr -> fx_media_sectors_per_cluster));
}
/* Read the new sector. */
status = _fx_utility_logical_sector_read(media_ptr, ((ULONG64) logical_sector),
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_DIRECTORY_SECTOR);
/* Check I/O status. */
if (status != FX_SUCCESS)
{
return(status);
}
/* Set the byte offset to 0 for new sector. */
byte_offset = 0;
}
else
{
/* Calculate the new byte offset. */
byte_offset += FX_DIR_ENTRY_SIZE;
}
/* Read sub entry. */
read_ptr = (UCHAR *)media_ptr -> fx_media_memory_buffer + (UINT)byte_offset;
/* Calculate checksum for sub entry. */
for (j = 0; j < FX_DIR_ENTRY_SIZE; ++j)
{
/* Right rotate the checksum by one bit position and add the data. */
checksum = (USHORT)(((checksum >> 1) | (checksum << 15)) + read_ptr[j]);
}
/* Add the entry number to the next entry. */
(*entry_ptr)++;
/* Check if we are processing the first secondary directory entry. */
if (i == 0)
{
/* Make sure the directory entry type is stream extension. */
if (*read_ptr != FX_EXFAT_DIR_ENTRY_TYPE_STREAM_EXTENSION)
{
/* Something wrong, stream entry should be next to file entry. */
return(FX_FILE_CORRUPT);
}
/* Read stream entry. */
/* Advance the pointer to general secondary flags field. */
read_ptr++;
/* Read NoFatChain field. */
dont_use_fat = ((*read_ptr) >> 1) & 1; /* 0 bit - current */
/* Check if we have a parent directory. */
if (source_dir)
{
/* Save the dont_use_fat flag for parent directory. */
dont_use_fat = (UCHAR)(dont_use_fat | ((source_dir -> fx_dir_entry_dont_use_fat & 1) << 1)); /* 1st bit parent */
}
/* Put the dont_use_fat flag to the destination. */
destination_ptr -> fx_dir_entry_dont_use_fat = (CHAR)dont_use_fat;
/* Skip the reserved1 field. */
read_ptr += 2;
/* Read the name length field. */
name_length = *read_ptr;
/* Check if name_length is invalid. */
if (name_length == 0)
{
/* Name length should be at least 1. Return error. */
return(FX_FILE_CORRUPT);
}
/* Advance the pointer to the name hash field. */
read_ptr++;
/* Hash search */
if (skip || (hash && (hash != _fx_utility_16_unsigned_read(read_ptr))))
{
/* Wrong hash, skip filename. */
destination_ptr -> fx_dir_entry_type = FX_EXFAT_DIR_ENTRY_TYPE_STREAM_EXTENSION;
name_length = 0;
(*entry_ptr) += (ULONG)(secondary_count - 1);
/* Return success. */
return(FX_SUCCESS);
}
/* Skip name hash and reserved2. */
read_ptr += 4;
/* Read Valid Data Len. */
destination_ptr -> fx_dir_entry_file_size = _fx_utility_64_unsigned_read(read_ptr);
/* Skip ValidDataLen and reserved3. */
read_ptr += 12;
destination_ptr -> fx_dir_entry_cluster = _fx_utility_32_unsigned_read(read_ptr);
read_ptr += 4;
/* Read Data Len. */
destination_ptr -> fx_dir_entry_available_file_size = _fx_utility_64_unsigned_read(read_ptr);
/* Checks for corruption */
if (((destination_ptr -> fx_dir_entry_available_file_size == 0) &&
(destination_ptr -> fx_dir_entry_cluster != 0)) ||
((destination_ptr -> fx_dir_entry_available_file_size != 0) &&
(destination_ptr -> fx_dir_entry_cluster == 0)))
{
/* Return file corrupt error. */
return(FX_FILE_CORRUPT);
}
/* File System Specification Ver 3.00 */
if (destination_ptr -> fx_dir_entry_cluster == 0)
{
/* Don't use FAT by default. */
destination_ptr -> fx_dir_entry_dont_use_fat |= 1;
}
/* Check for directory restrictions. */
if ((destination_ptr -> fx_dir_entry_attributes & FX_DIRECTORY) &&
(destination_ptr -> fx_dir_entry_available_file_size != destination_ptr -> fx_dir_entry_file_size))
{
/* Return file corrupt error. */
return(FX_FILE_CORRUPT);
}
/* Check if the directory size exceed file system limits. */
if ((destination_ptr -> fx_dir_entry_attributes & FX_DIRECTORY) &&
(destination_ptr -> fx_dir_entry_available_file_size > FX_EXFAT_MAX_DIRECTORY_SIZE))
{
/* Return the no more space error. */
return(FX_NO_MORE_SPACE);
}
}
else
{
/* Check if the entry type is file name directory entry. */
if (*read_ptr == FX_EXFAT_DIR_ENTRY_TYPE_FILE_NAME)
{
/* Skip the entry type and flags field. */
read_ptr += 2;
/* There are 15 characters in one file name directory entry. */
if (name_length > 15)
{
/* Set copy size to the max size of one entry. */
copy_size = 15;
}
else
{
/* Set copy size to the acutal remaining length. */
copy_size = name_length;
}
/* Check if we are requested to return the unicode name. */
if (unicode_name)
{
/* Loop to copy the unicode file name. from the file name directory entry. */
for (j = 0; j < copy_size * 2; ++j)
{
/* Copy the unicode file name from the file name directory entry. */
unicode_name[name_pos * 2 + j] = *read_ptr++;
}
/* Revert the read pointer for later use. */
read_ptr -= copy_size * 2;
}
/* Loop to copy the non-unicode file name. */
for (j = 0; j < copy_size; ++j)
{
/* Copy and convert the file name from the file name directory entry. */
destination_ptr -> fx_dir_entry_name[name_pos++] = (CHAR)_fx_utility_16_unsigned_read(read_ptr);
read_ptr += 2;
}
/* Modify the name_length to indicate the remaining length. */
name_length = (UCHAR)(name_length - copy_size);
}
else if (((*read_ptr & (FX_EXFAT_ENTRY_TYPE_IN_USE_MASK | FX_EXFAT_ENTRY_TYPE_IMPORTANCE_MASK | FX_EXFAT_ENTRY_TYPE_CATEGORY_MASK)) ==
(FX_EXFAT_ENTRY_TYPE_IN_USE_MASK | FX_EXFAT_ENTRY_TYPE_CATEGORY_MASK)))
{
/* Unknown critical secondary, we can't work with this directory. */
return(FX_FILE_CORRUPT);
}
}
}
/* Terminate the entry name string. */
destination_ptr -> fx_dir_entry_name[name_pos] = 0;
/* Check if we are requested to return the unicode name. */
if (unicode_name)
{
/* Terminate the unicode name string. */
unicode_name[name_pos * 2] = 0;
unicode_name[name_pos * 2 + 1] = 0;
/* Check if we are requested to return the unicode name length. */
if (unicode_length)
{
/* Return the unicode name length. */
*unicode_length = name_pos;
}
}
/* Verify checksum. */
if (checksum != file_checksum)
{
/* Return corrupted file error. */
return(FX_FILE_CORRUPT);
}
/* Check if we have found all the file name directory entries. */
if (name_length != 0)
{
/* Return file corrupted error. */
return(FX_FILE_CORRUPT);
}
/* Return success. */
return(FX_SUCCESS);
}
#endif
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