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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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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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/** Media */ |
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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_system.h" |
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#include "fx_directory.h" |
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#include "fx_media.h" |
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#include "fx_utility.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _fx_media_volume_get_extended PORTABLE C */ |
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/* 6.1.11 */ |
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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 reads the volume name stored in the media's boot */ |
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/* record or root directory. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* media_ptr Media control block pointer */ |
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/* volume_name Pointer to destination for */ |
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/* the volume name (maximum */ |
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/* 11 characters + NULL) */ |
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/* volume_name_buffer_length Buffer length for volume_name */ |
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/* volume_source Source of volume */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* return status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _fx_utility_logical_sector_read Read directory sector */ |
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/* _fx_directory_entry_read Directory entry read */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application Code */ |
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/* */ |
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/**************************************************************************/ |
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UINT _fx_media_volume_get_extended(FX_MEDIA *media_ptr, CHAR *volume_name, UINT volume_name_buffer_length, UINT volume_source) |
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{ |
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UINT status, offset; |
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ULONG i; |
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INT j; |
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FX_DIR_ENTRY dir_entry; |
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/* Clear the volume name. */ |
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volume_name[0] = FX_NULL; |
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/* Check the media to make sure it is open. */ |
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✓✓ |
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if (media_ptr -> fx_media_id != FX_MEDIA_ID) |
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{ |
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/* Return the media not opened error. */ |
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return(FX_MEDIA_NOT_OPEN); |
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} |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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FX_TRACE_IN_LINE_INSERT(FX_TRACE_MEDIA_VOLUME_GET, media_ptr, volume_name, volume_source, 0, FX_TRACE_MEDIA_EVENTS, 0, 0) |
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/* Protect against other threads accessing the media. */ |
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FX_PROTECT |
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/* Ensure the volume name is NULL initially. */ |
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volume_name[0] = FX_NULL; |
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✓✓ |
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if (volume_source == FX_DIRECTORY_SECTOR) |
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{ |
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/* Setup pointer to media name buffer. */ |
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dir_entry.fx_dir_entry_name = media_ptr -> fx_media_name_buffer; |
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/* Clear the short name string. */ |
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dir_entry.fx_dir_entry_short_name[0] = 0; |
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/* Attempt to find the volume name in the root directory. */ |
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i = 0; |
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do |
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{ |
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/* Read an entry from the root directory. */ |
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status = _fx_directory_entry_read(media_ptr, FX_NULL, &i, &dir_entry); |
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/* Check for error status. */ |
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✓✓ |
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if (status != FX_SUCCESS) |
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{ |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Return to caller. */ |
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return(status); |
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} |
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/* Check for a volume name. */ |
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✓✓✓✓
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if ((dir_entry.fx_dir_entry_attributes & FX_VOLUME) && ((UCHAR)dir_entry.fx_dir_entry_name[0] != (UCHAR)FX_DIR_ENTRY_FREE)) |
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{ |
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/* Yes, we have found a previously set volume name. */ |
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break; |
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} |
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/* Move to next directory entry. */ |
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i++; |
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✓✓ |
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} while (i < media_ptr -> fx_media_root_directory_entries); |
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/* Determine if a volume entry has been found. */ |
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✓✓ |
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if (i < media_ptr -> fx_media_root_directory_entries) |
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{ |
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/* Read the logical directory sector. */ |
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status = _fx_utility_logical_sector_read(media_ptr, (ULONG64) dir_entry.fx_dir_entry_log_sector, |
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media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_DIRECTORY_SECTOR); |
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/* Determine if an error occurred. */ |
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✓✓ |
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if (status != FX_SUCCESS) |
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{ |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Return error code. */ |
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return(status); |
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} |
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/* Offset to volume label entry. */ |
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offset = dir_entry.fx_dir_entry_byte_offset; |
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/* Skip trailing space characters of volume name. */ |
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✓✓ |
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for (j = 10; j >= 0; j--) |
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{ |
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/* Check for space character. */ |
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✓✓ |
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if (media_ptr -> fx_media_memory_buffer[offset + (UINT)j] != (UCHAR)' ') |
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{ |
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/* Last character found. */ |
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break; |
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} |
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} |
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/* Check if the buffer is too short for the name. */ |
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✓✓ |
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if (j >= (INT)volume_name_buffer_length - 1) |
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{ |
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/* Buffer too short, return error. */ |
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status = FX_BUFFER_ERROR; |
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/* Set character count to fit for the buffer. */ |
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j = (INT)volume_name_buffer_length - 2; |
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} |
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/* NULL terminate the volume name. */ |
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volume_name[j + 1] = FX_NULL; |
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/* Pickup the remaining characters of the volume name from the boot sector. */ |
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✓✓ |
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for (; j >= 0; j--) |
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{ |
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/* Pickup byte of volume name. */ |
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volume_name[j] = (CHAR)media_ptr -> fx_media_memory_buffer[offset + (UINT)j]; |
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} |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Return the completion status. */ |
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return(status); |
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} |
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} |
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/* Read volume name from boot record. */ |
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/* Read the logical directory sector 0 - we just do this to get a memory_buffer pointer */ |
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status = _fx_utility_logical_sector_read(media_ptr, ((ULONG64) 0), |
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media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_DATA_SECTOR); |
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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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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Return the error status. */ |
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return(status); |
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} |
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#ifndef FX_MEDIA_STATISTICS_DISABLE |
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/* Increment the number of driver read boot sector requests. */ |
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media_ptr -> fx_media_driver_boot_read_requests++; |
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#endif |
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/* Build the driver request to read the boot record. */ |
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media_ptr -> fx_media_driver_request = FX_DRIVER_BOOT_READ; |
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media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
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media_ptr -> fx_media_driver_buffer = media_ptr -> fx_media_memory_buffer; |
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media_ptr -> fx_media_driver_sectors = 1; |
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media_ptr -> fx_media_driver_sector_type = FX_BOOT_SECTOR; |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_BOOT_READ, media_ptr, media_ptr -> fx_media_memory_buffer, 0, 0, FX_TRACE_INTERNAL_EVENTS, 0, 0) |
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/* Invoke the driver to read the boot sector. */ |
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(media_ptr -> fx_media_driver_entry) (media_ptr); |
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/* Determine if the request is successful. */ |
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✓✓ |
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if (media_ptr -> fx_media_driver_status) |
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{ |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* An error occurred in the driver. */ |
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return(media_ptr -> fx_media_driver_status); |
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} |
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/* Calculate the offset to the volume name based on the type of FAT. */ |
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✓✓ |
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if (media_ptr -> fx_media_32_bit_FAT) |
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{ |
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/* FAT32 offset to volume name. */ |
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offset = FX_VOLUME_LABEL_32; |
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} |
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else |
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{ |
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/* FAT12/16 offset to volume name. */ |
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offset = FX_VOLUME_LABEL; |
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} |
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/* Skip trailing space characters of volume name. */ |
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✓✓ |
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for (j = 10; j >= 0; j--) |
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{ |
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/* Check for space character. */ |
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✓✓ |
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if (media_ptr -> fx_media_memory_buffer[offset + (UINT)j] != (UCHAR)' ') |
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{ |
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/* Last character found. */ |
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break; |
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} |
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} |
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/* Check if the buffer is too short for the name. */ |
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✓✓ |
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if (j >= (INT)volume_name_buffer_length - 1) |
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{ |
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/* Buffer too short, return error. */ |
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status = FX_BUFFER_ERROR; |
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/* Set character count to fit for the buffer. */ |
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j = (INT)volume_name_buffer_length - 2; |
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} |
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/* NULL terminate the volume name. */ |
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volume_name[j + 1] = FX_NULL; |
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/* Pickup the remaining characters of the volume name from the boot sector. */ |
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✓✓ |
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for (; j >= 0; j--) |
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{ |
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/* Pickup byte of volume name. */ |
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volume_name[j] = (CHAR)media_ptr -> fx_media_memory_buffer[offset + (UINT)j]; |
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} |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Return the completion status. */ |
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return(status); |
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} |
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