mirror of
https://github.com/eclipse-threadx/filex.git
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90 lines
4.6 KiB
C
90 lines
4.6 KiB
C
/***************************************************************************
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* Copyright (c) 2024 Microsoft Corporation
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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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/** Utility */
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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_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_utility_64_unsigned_read 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 reads (with endian awareness) a 64-bit unsigned data */
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/* from the specified source and returns the value to the caller. */
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/* */
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/* INPUT */
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/* */
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/* source_ptr Source memory pointer */
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/* */
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/* OUTPUT */
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/* */
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/* ULONG64 value */
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/* */
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/* CALLS */
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/* */
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/* None */
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/* */
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/* CALLED BY */
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/* */
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/* FileX System Functions */
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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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ULONG64 _fx_utility_64_unsigned_read(UCHAR *source_ptr)
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{
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ULONG64 value;
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ULONG upper_portion;
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ULONG lower_portion;
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lower_portion = _fx_utility_32_unsigned_read(source_ptr);
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upper_portion = _fx_utility_32_unsigned_read(source_ptr + sizeof(ULONG));
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value = ((ULONG64)upper_portion) << 32;
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value |= (ULONG64)lower_portion;
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/* Return 64-bit value to caller. */
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return(value);
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}
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