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/**************************************************************************/ |
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/* */ |
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/* Copyright (c) Microsoft Corporation. All rights reserved. */ |
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/* */ |
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/* This software is licensed under the Microsoft Software License */ |
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */ |
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ |
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/* and in the root directory of this software. */ |
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/* */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** FileX Component */ |
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/** */ |
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/** Unicode */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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#define FX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "fx_api.h" |
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#include "fx_unicode.h" |
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#include "fx_utility.h" |
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#ifndef FX_NO_LOCAL_PATH |
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FX_LOCAL_PATH_SETUP |
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#endif |
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/* Define several Unicode working arrays... This keeps the data structures |
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off the local stack. */ |
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UCHAR _fx_unicode_temp_long_file_name[FX_MAX_LONG_NAME_LEN]; |
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UCHAR _fx_unicode_search_name[FX_MAX_LONG_NAME_LEN * 2]; |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _fx_unicode_directory_search PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* William E. Lamie, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function searches for the specified unicode or short name. */ |
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/* */ |
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/* Note: The buffer of short_name and unicode_name must be valid to */ |
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/* fill search result. When short_name is a zero length string, search */ |
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/* is based on unicode string (terminated with NULL). If it's found */ |
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/* the short name is written back to buffer of short_name. In this case*/ |
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/* unicode_name_buffer_length is ignored and short_name_buffer_length */ |
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/* must not be zero to specify the buffer length. If buffer is too */ |
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/* smallfor the result, overflow characters and NULL-terminator are cut*/ |
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/* off. When short_name is a valid string, search is based on */ |
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/* short_name (terminated with NULL). If it's found the unicode name is*/ |
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/* written back to buffer of unicode_name. In this case */ |
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/* short_name_buffer_length is ignored and unicode_name_buffer_length */ |
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/* must not be zero to specify the unicode buffer length. If buffer is */ |
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/* too small for the result, overflow characters are cut off but */ |
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/* NULL-terminator is kept. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* media_ptr Pointer to media */ |
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/* short_name Pointer to short name */ |
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/* short_name_buffer_length Buffer length for short name */ |
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/* unicode_name Pointer to Unicode name */ |
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/* unicode_name_length Unicode name length */ |
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/* unicode_name_buffer_length Buffer length for Unicode name*/ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Completion Status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _fx_unicode_directory_entry_read Read a full unicode directory */ |
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/* entry */ |
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/* _fx_utility_FAT_entry_read Read a FAT entry */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Unicode Utilities */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 William E. Lamie Initial Version 6.0 */ |
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/* 09-30-2020 William E. Lamie Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* */ |
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/**************************************************************************/ |
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UINT _fx_unicode_directory_search(FX_MEDIA *media_ptr, FX_DIR_ENTRY *entry_ptr, |
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UCHAR *short_name, ULONG short_name_buffer_length, |
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UCHAR *unicode_name, ULONG *unicode_name_length, ULONG unicode_name_buffer_length) |
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{ |
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ULONG i, j; |
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UINT status, found; |
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ULONG cluster, next_cluster = 0; |
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ULONG directory_size; |
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FX_DIR_ENTRY search_dir; |
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FX_DIR_ENTRY *search_dir_ptr; |
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ULONG unicode_search_length; |
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ULONG local_unicode_name_length; |
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CHAR unicode_to_short_name[13]; |
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CHAR *short_name_ptr; |
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/* Setup temp unicode name length. */ |
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local_unicode_name_length = *unicode_name_length; |
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#ifndef FX_MEDIA_STATISTICS_DISABLE |
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/* Increment the number of directory search requests. */ |
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media_ptr -> fx_media_directory_searches++; |
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#endif |
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/* Set the initial search directory to the current working |
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directory - if there is one. */ |
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/* First check for a local path pointer stored in the thread control block. This |
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is only available in ThreadX Version 4 and above. */ |
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#ifndef FX_NO_LOCAL_PATH |
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✓✓ |
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if (_tx_thread_current_ptr -> tx_thread_filex_ptr) |
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{ |
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/* Determine if the local directory is not the root directory. */ |
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✓✓ |
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if (((FX_PATH *)_tx_thread_current_ptr -> tx_thread_filex_ptr) -> fx_path_directory.fx_dir_entry_name[0]) |
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{ |
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/* Start at the current working directory of the media. */ |
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search_dir = ((FX_PATH *)_tx_thread_current_ptr -> tx_thread_filex_ptr) -> fx_path_directory; |
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/* Set the internal pointer to the search directory as well. */ |
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search_dir_ptr = &search_dir; |
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} |
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else |
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{ |
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/* We are searching in the root directory. */ |
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search_dir_ptr = FX_NULL; |
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} |
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} |
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else |
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#endif |
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✓✓ |
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if (media_ptr -> fx_media_default_path.fx_path_directory.fx_dir_entry_name[0]) |
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{ |
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/* Start at the current working directory of the media. */ |
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search_dir = media_ptr -> fx_media_default_path.fx_path_directory; |
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/* Set the internal pointer to the search directory as well. */ |
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search_dir_ptr = &search_dir; |
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} |
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else |
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{ |
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/* The current default directory is the root so just set the |
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search directory pointer to NULL. */ |
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search_dir_ptr = FX_NULL; |
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} |
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/* Calculate the directory size. */ |
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✓✓ |
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if (search_dir_ptr) |
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{ |
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/* Ensure that the search directory's last search cluster is cleared. */ |
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search_dir_ptr -> fx_dir_entry_last_search_cluster = 0; |
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/* Calculate the directory size by counting the allocated |
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clusters for it. */ |
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i = 0; |
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cluster = search_dir_ptr -> fx_dir_entry_cluster; |
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✓✓✓✓
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while ((cluster >= FX_FAT_ENTRY_START) && (cluster < media_ptr -> fx_media_fat_reserved)) |
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{ |
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/* Increment the cluster count. */ |
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i++; |
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/* Read the next FAT entry. */ |
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status = _fx_utility_FAT_entry_read(media_ptr, cluster, &next_cluster); |
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/* Check the return status. */ |
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✓✓ |
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if (status != FX_SUCCESS) |
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{ |
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/* Return the bad status. */ |
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return(status); |
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} |
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/* Check for error situation. */ |
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✓✓✓✓
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if ((cluster == next_cluster) || (i > media_ptr -> fx_media_total_clusters)) |
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{ |
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/* Return the bad status. */ |
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return(FX_FAT_READ_ERROR); |
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} |
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cluster = next_cluster; |
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} |
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/* Now we can calculate the directory size. */ |
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directory_size = (((ULONG)media_ptr -> fx_media_bytes_per_sector) * |
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((ULONG)media_ptr -> fx_media_sectors_per_cluster) * i) / |
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(ULONG)FX_DIR_ENTRY_SIZE; |
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/* Also save this in the directory entry so we don't have to |
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calculate it later. */ |
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search_dir_ptr -> fx_dir_entry_file_size = directory_size; |
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} |
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else |
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{ |
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/* Directory size is the number of entries in the root directory. */ |
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directory_size = (ULONG)media_ptr -> fx_media_root_directory_entries; |
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} |
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/* Determine if we are searching for a short file name or a unicode file name. */ |
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✓✓ |
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if (short_name[0] == 0) |
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{ |
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/* If the unicode name fit into short name length, covert the Unicode to ASCII if possible. */ |
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✓✓ |
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if (local_unicode_name_length <= 13) |
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{ |
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✓✓ |
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for (j = 0; j < local_unicode_name_length; j++) |
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{ |
240 |
✓✓✓✓
|
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if ((unicode_name[j * 2] <= 0x7F) && (unicode_name[j * 2 + 1] == 0)) |
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{ |
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unicode_to_short_name[j] = (CHAR)unicode_name[j * 2]; |
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✓✓✓✓
|
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if ((unicode_to_short_name[j] >= 'a') && (unicode_to_short_name[j] <= 'z')) |
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{ |
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/* Lower case, convert to upper case! */ |
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unicode_to_short_name[j] = (CHAR)((INT)unicode_to_short_name[j] - 0x20); |
249 |
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} |
250 |
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} |
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else |
252 |
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{ |
253 |
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unicode_to_short_name[0] = 0; |
254 |
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break; |
255 |
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} |
256 |
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} |
257 |
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} |
258 |
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else |
259 |
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{ |
260 |
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147 |
unicode_to_short_name[0] = 0; |
261 |
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} |
262 |
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} |
263 |
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else |
264 |
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{ |
265 |
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12 |
unicode_to_short_name[0] = 0; |
266 |
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} |
267 |
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268 |
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/* Loop through entries in the directory. Yes, this is a |
269 |
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linear search! */ |
270 |
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i = 0; |
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do |
272 |
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{ |
273 |
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274 |
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/* Read an entry from the directory. */ |
275 |
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8551 |
status = _fx_unicode_directory_entry_read(media_ptr, search_dir_ptr, &i, entry_ptr, &_fx_unicode_search_name[0], &unicode_search_length); |
276 |
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8551 |
i++; |
277 |
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278 |
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/* Check for error status. */ |
279 |
✓✓ |
8551 |
if (status != FX_SUCCESS) |
280 |
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{ |
281 |
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14 |
return(status); |
282 |
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} |
283 |
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284 |
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/* Determine if this is an empty entry. */ |
285 |
✓✓✓✓
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8537 |
if (((UCHAR)entry_ptr -> fx_dir_entry_name[0] == (UCHAR)FX_DIR_ENTRY_FREE) && (entry_ptr -> fx_dir_entry_short_name[0] == 0)) |
286 |
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{ |
287 |
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277 |
continue; |
288 |
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} |
289 |
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290 |
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/* Determine if this is the last directory entry. */ |
291 |
✓✓ |
8260 |
if ((UCHAR)entry_ptr -> fx_dir_entry_name[0] == (UCHAR)FX_DIR_ENTRY_DONE) |
292 |
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{ |
293 |
|
356 |
break; |
294 |
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} |
295 |
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296 |
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/* Determine if there is a short name to match. */ |
297 |
✓✓ |
7904 |
if (unicode_to_short_name[0]) |
298 |
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{ |
299 |
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300 |
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/* Get the short name pointer. */ |
301 |
✓✓ |
2483 |
if (entry_ptr -> fx_dir_entry_short_name[0]) |
302 |
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{ |
303 |
|
2280 |
short_name_ptr = entry_ptr -> fx_dir_entry_short_name; |
304 |
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} |
305 |
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else |
306 |
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{ |
307 |
|
203 |
short_name_ptr = entry_ptr -> fx_dir_entry_name; |
308 |
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} |
309 |
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310 |
✓✓ |
2596 |
for (j = 0; j < local_unicode_name_length; j++) |
311 |
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{ |
312 |
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313 |
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/* Compare characters. */ |
314 |
✓✓ |
2593 |
if (short_name_ptr[j] != unicode_to_short_name[j]) |
315 |
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{ |
316 |
|
2480 |
break; |
317 |
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} |
318 |
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} |
319 |
✓✓ |
2483 |
if (j == local_unicode_name_length) |
320 |
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{ |
321 |
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322 |
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/* Only the 1st 13 bytes or the buffer length is copied, whichever is smaller. */ |
323 |
✓✓ |
3 |
if (short_name_buffer_length > 13) |
324 |
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{ |
325 |
|
1 |
short_name_buffer_length = 13; |
326 |
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} |
327 |
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328 |
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/* The names match, copy the short name into the destination. */ |
329 |
✓✓ |
42 |
for (j = 0; j < short_name_buffer_length; j++) |
330 |
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{ |
331 |
|
39 |
short_name[j] = (UCHAR)short_name_ptr[j]; |
332 |
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} |
333 |
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334 |
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/* Return success to caller. */ |
335 |
|
3 |
return(FX_SUCCESS); |
336 |
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} |
337 |
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} |
338 |
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339 |
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/* Determine if this is not a unicode name. */ |
340 |
✓✓ |
7901 |
if (unicode_search_length == 0) |
341 |
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{ |
342 |
|
250 |
continue; |
343 |
|
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} |
344 |
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|
345 |
|
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/* Determine if we are searching for a short file name or a unicode file name. */ |
346 |
✓✓ |
7651 |
if (short_name[0]) |
347 |
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{ |
348 |
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|
349 |
|
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/* We have a short name and need a unicode name. Compare the short name against the short name in |
350 |
|
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the directory entry for a match. */ |
351 |
|
36 |
found = FX_TRUE; |
352 |
✓✓ |
121 |
for (j = 0; j < 12; j++) |
353 |
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{ |
354 |
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|
355 |
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/* Compare characters... */ |
356 |
✓✓ |
119 |
if (entry_ptr -> fx_dir_entry_short_name[0]) |
357 |
|
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{ |
358 |
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|
359 |
|
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/* Yes, the return name is in the short name field... compare against it! */ |
360 |
✓✓ |
107 |
if (short_name[j] != (UCHAR)entry_ptr -> fx_dir_entry_short_name[j]) |
361 |
|
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{ |
362 |
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|
363 |
|
20 |
found = FX_FALSE; |
364 |
|
20 |
break; |
365 |
|
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} |
366 |
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} |
367 |
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else |
368 |
|
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{ |
369 |
|
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|
370 |
|
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/* No, the return name is in the name field... compare against it! */ |
371 |
✓✓ |
12 |
if (short_name[j] != (UCHAR)entry_ptr -> fx_dir_entry_name[j]) |
372 |
|
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{ |
373 |
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|
374 |
|
6 |
found = FX_FALSE; |
375 |
|
6 |
break; |
376 |
|
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} |
377 |
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} |
378 |
|
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|
379 |
|
|
/* Are we done? */ |
380 |
✓✓ |
93 |
if (short_name[j] == (UCHAR)FX_NULL) |
381 |
|
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{ |
382 |
|
8 |
break; |
383 |
|
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} |
384 |
|
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} |
385 |
|
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|
386 |
|
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/* One final compare to see if we have a match. */ |
387 |
✓✓✓✓
✓✓ |
36 |
if ((found == FX_FALSE) || ((j == 12) && (short_name[12] != 0))) |
388 |
|
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{ |
389 |
|
27 |
continue; |
390 |
|
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} |
391 |
|
|
|
392 |
|
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/* A match was found so copy the unicode name and length and return. */ |
393 |
|
|
/* Copy the length. */ |
394 |
|
9 |
*unicode_name_length = unicode_search_length; |
395 |
|
|
|
396 |
|
|
/* Check if the name fit in the buffer. */ |
397 |
✓✓ |
9 |
if (unicode_name_buffer_length < (unicode_search_length + 1) * 2) |
398 |
|
|
{ |
399 |
|
1 |
unicode_search_length = (unicode_name_buffer_length - 2) / 2; |
400 |
|
|
} |
401 |
|
|
|
402 |
|
|
/* Copy the unicode name. */ |
403 |
✓✓ |
107 |
for (j = 0; j < unicode_search_length * 2; j++) |
404 |
|
|
{ |
405 |
|
|
|
406 |
|
|
/* Copy one unicode character to the destination... */ |
407 |
|
98 |
unicode_name[j] = _fx_unicode_search_name[j]; |
408 |
|
|
} |
409 |
|
|
|
410 |
|
|
/* Make sure there is a NULL in the destination. */ |
411 |
|
9 |
unicode_name[j] = (UCHAR)0; |
412 |
|
9 |
unicode_name[j + 1] = (UCHAR)0; |
413 |
|
|
|
414 |
|
|
|
415 |
|
|
|
416 |
|
|
/* Return successful completion. */ |
417 |
|
9 |
return(FX_SUCCESS); |
418 |
|
|
} |
419 |
|
|
else |
420 |
|
|
{ |
421 |
|
|
|
422 |
|
|
/* Determine if this is the correct unicode name. */ |
423 |
✓✓ |
7615 |
if (unicode_search_length != local_unicode_name_length) |
424 |
|
|
{ |
425 |
|
1551 |
continue; |
426 |
|
|
} |
427 |
|
|
|
428 |
|
|
/* Compare the unicode search name with the requested unicode name. */ |
429 |
✓✓ |
6837 |
for (j = 0; j < (local_unicode_name_length * 2); j = j + 2) |
430 |
|
|
{ |
431 |
|
|
|
432 |
|
|
/* Compare bytes of each unicode name. */ |
433 |
✓✓ |
6682 |
if (unicode_name[j] != _fx_unicode_search_name[j]) |
434 |
|
|
{ |
435 |
|
|
|
436 |
|
|
/* Not match, Check if the character is in ASCII range. */ |
437 |
✓✓✓✓
|
5873 |
if ((_fx_unicode_search_name[j + 1] == 0) && (unicode_name[j + 1] == 0)) |
438 |
|
|
{ |
439 |
|
|
|
440 |
|
|
/* Check if it is case mismatch. */ |
441 |
✓✓✓✓
|
5644 |
if ((unicode_name[j]) >= 'a' && (unicode_name[j] <= 'z')) |
442 |
|
|
{ |
443 |
✓✓ |
1152 |
if ((unicode_name[j] - 0x20) == _fx_unicode_search_name[j]) |
444 |
|
|
{ |
445 |
|
1 |
continue; |
446 |
|
|
} |
447 |
|
|
} |
448 |
✓✓✓✓
|
5643 |
if ((_fx_unicode_search_name[j]) >= 'a' && (_fx_unicode_search_name[j] <= 'z')) |
449 |
|
|
{ |
450 |
✓✓ |
1311 |
if ((_fx_unicode_search_name[j] - 0x20) == unicode_name[j]) |
451 |
|
|
{ |
452 |
|
1 |
continue; |
453 |
|
|
} |
454 |
|
|
} |
455 |
|
|
} |
456 |
|
|
|
457 |
|
5871 |
break; |
458 |
|
|
} |
459 |
|
|
|
460 |
|
|
/* Compare the next byte. */ |
461 |
✓✓ |
809 |
if (unicode_name[j + 1] != _fx_unicode_search_name[j + 1]) |
462 |
|
|
{ |
463 |
|
38 |
break; |
464 |
|
|
} |
465 |
|
|
} |
466 |
|
|
|
467 |
|
|
/* Determine if the names do not match. */ |
468 |
✓✓ |
6064 |
if (j != (local_unicode_name_length * 2)) |
469 |
|
|
{ |
470 |
|
5909 |
continue; |
471 |
|
|
} |
472 |
|
|
|
473 |
|
|
/* Otherwise, the names match, copy the short name into the destination. */ |
474 |
|
|
/* Only the 1st 13 bytes or the buffer length is copied, whichever is smaller. */ |
475 |
✓✓ |
155 |
if (short_name_buffer_length > 13) |
476 |
|
|
{ |
477 |
|
1 |
short_name_buffer_length = 13; |
478 |
|
|
} |
479 |
✓✓ |
2170 |
for (j = 0; j < short_name_buffer_length; j++) |
480 |
|
|
{ |
481 |
|
|
|
482 |
|
|
/* Copy a character. */ |
483 |
✓✓ |
2015 |
if (entry_ptr -> fx_dir_entry_short_name[0]) |
484 |
|
|
{ |
485 |
|
1521 |
short_name[j] = (UCHAR)entry_ptr -> fx_dir_entry_short_name[j]; |
486 |
|
|
} |
487 |
|
|
else |
488 |
|
|
{ |
489 |
|
494 |
short_name[j] = (UCHAR)entry_ptr -> fx_dir_entry_name[j]; |
490 |
|
|
} |
491 |
|
|
} |
492 |
|
|
|
493 |
|
|
/* Return success to caller. */ |
494 |
|
155 |
return(FX_SUCCESS); |
495 |
|
|
} |
496 |
✓✓ |
8014 |
} while (i < directory_size); |
497 |
|
|
|
498 |
|
|
/* Return not found. */ |
499 |
|
460 |
return(FX_NOT_FOUND); |
500 |
|
|
} |
501 |
|
|
|