1 /**************************************************************************/ 2 /* */ 3 /* Copyright (c) Microsoft Corporation. All rights reserved. */ 4 /* */ 5 /* This software is licensed under the Microsoft Software License */ 6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */ 7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ 8 /* and in the root directory of this software. */ 9 /* */ 10 /**************************************************************************/ 11 12 13 /**************************************************************************/ 14 /**************************************************************************/ 15 /** */ 16 /** USBX Component */ 17 /** */ 18 /** Pictbridge Application */ 19 /** */ 20 /**************************************************************************/ 21 /**************************************************************************/ 22 23 24 /* Include necessary system files. */ 25 26 #define UX_SOURCE_CODE 27 28 #include "ux_api.h" 29 #include "ux_pictbridge.h" 30 31 32 /**************************************************************************/ 33 /* */ 34 /* FUNCTION RELEASE */ 35 /* */ 36 /* _ux_pictbridge_element_to_decimal PORTABLE C */ 37 /* 6.1 */ 38 /* AUTHOR */ 39 /* */ 40 /* Chaoqiong Xiao, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* This function translates an element into a decimal value. */ 45 /* */ 46 /* INPUT */ 47 /* */ 48 /* element Where to store the element */ 49 /* decimal_value Value to be returned */ 50 /* */ 51 /* OUTPUT */ 52 /* */ 53 /* Completion Status */ 54 /* */ 55 /* CALLS */ 56 /* */ 57 /* */ 58 /* CALLED BY */ 59 /* */ 60 /* _ux_pictbridge_object_parse */ 61 /* */ 62 /* RELEASE HISTORY */ 63 /* */ 64 /* DATE NAME DESCRIPTION */ 65 /* */ 66 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */ 67 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */ 68 /* resulting in version 6.1 */ 69 /* */ 70 /**************************************************************************/ _ux_pictbridge_element_to_decimal(UCHAR * element,ULONG * decimal_value)71UINT _ux_pictbridge_element_to_decimal(UCHAR *element, ULONG *decimal_value) 72 { 73 74 ULONG element_length; 75 ULONG local_decimal_value; 76 UCHAR element_content; 77 UCHAR element_decimal; 78 ULONG multiplier; 79 ULONG multiplier_length; 80 UINT string_length = 0; 81 UINT status; 82 83 84 /* Get the string length, max 4294967295 (0xFFFFFFFF), 10 digits. */ 85 status = _ux_utility_string_length_check(element, &string_length, 10); 86 if (status != UX_SUCCESS) 87 return(status); 88 89 /* Get the element length. Should not be more than 8 characters. */ 90 element_length = string_length; 91 92 /* Check the length. Error if 0. */ 93 if (element_length == 0) 94 95 /* We have a syntax violation. */ 96 return(UX_ERROR); 97 98 /* Reset the local decimal value. */ 99 local_decimal_value = 0; 100 101 /* Calculate the multiplier value. First reset it. */ 102 multiplier = 1; 103 104 /* Set the length of the string. */ 105 multiplier_length = element_length; 106 107 /* Build the multiplier : 10 square length. */ 108 while (multiplier_length-- > 1) 109 110 /* Add another decimal. */ 111 multiplier = multiplier * 10; 112 113 /* We parse the element and build the decimal value one byte at a type. */ 114 while(element_length) 115 { 116 117 /* Get the element content. */ 118 element_content = *element; 119 120 /* Check for the element content. Should be >0 <9. */ 121 if (element_content >= '0' && element_content <= '9') 122 123 /* We have a digit. */ 124 element_decimal = (UCHAR)(element_content - '0'); 125 126 else 127 /* We have a syntax violation. */ 128 return(UX_ERROR); 129 130 /* Add the found value to the current cumulated decimal value. */ 131 local_decimal_value += (ULONG) element_decimal * multiplier; 132 133 /* Next position. */ 134 element++; 135 136 /* Update length. */ 137 element_length--; 138 139 /* Reduce the multiplier by one decimal. */ 140 multiplier = multiplier / 10; 141 142 } 143 144 /* We have finished building the 32 bit decimal value. */ 145 *decimal_value = local_decimal_value; 146 147 /* Operation was successful. */ 148 return(UX_SUCCESS); 149 } 150 151
