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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_directory_exFAT.h"
#include "fx_utility.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_utility_exFAT_unicode_name_hash_get PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function returns hash of Unicode file name. */
/* */
/* INPUT */
/* */
/* unicode_name Unicode file name */
/* unicode_length Unicode name length */
/* */
/* OUTPUT */
/* */
/* return name hash */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _fx_directory_exFAT_entry_write */
/* _fx_directory_rename */
/* */
/* 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 */
/* */
/**************************************************************************/
USHORT _fx_utility_exFAT_unicode_name_hash_get(CHAR *unicode_name, ULONG unicode_length)
{
USHORT hash;
USHORT upcased_char;
/* Initialize hash to 0. */
hash = 0;
/* Is there a name? */
if (!unicode_name)
{
/* No, just return 0. */
return(0);
}
/* Create hash for name. */
while (unicode_length)
{
/* Get up-cased character. */
upcased_char = (USHORT)(_fx_utility_exFAT_upcase_get((USHORT)(*unicode_name | (*(unicode_name + 1) << 8))));
/* Compute hash. */
hash = (USHORT)(((hash >> 1) | (hash << 15)) + (upcased_char & 0xFF));
hash = (USHORT)(((hash >> 1) | (hash << 15)) + (upcased_char >> 8));
/* Move to next character of the Unicode name. */
unicode_name = unicode_name + 2;
/* Decrement length. */
unicode_length--;
}
/* Return the hash. */
return(hash);
}
#endif /* FX_ENABLE_EXFAT */
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