1 | /* $Id: fsw_efi_lib.c 98103 2023-01-17 14:15:46Z vboxsync $ */
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2 | /** @file
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3 | * fsw_efi_lib.c - EFI host environment library functions.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2010-2023 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * The contents of this file may alternatively be used under the terms
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26 | * of the Common Development and Distribution License Version 1.0
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27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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28 | * in the VirtualBox distribution, in which case the provisions of the
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29 | * CDDL are applicable instead of those of the GPL.
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30 | *
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31 | * You may elect to license modified versions of this file under the
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32 | * terms and conditions of either the GPL or the CDDL or both.
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33 | *
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34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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35 | * ---------------------------------------------------------------------------
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36 | * This code is based on:
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37 | *
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38 | * Copyright (c) 2006 Christoph Pfisterer
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39 | *
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40 | * Redistribution and use in source and binary forms, with or without
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41 | * modification, are permitted provided that the following conditions are
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42 | * met:
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43 | *
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44 | * * Redistributions of source code must retain the above copyright
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45 | * notice, this list of conditions and the following disclaimer.
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46 | *
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47 | * * Redistributions in binary form must reproduce the above copyright
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48 | * notice, this list of conditions and the following disclaimer in the
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49 | * documentation and/or other materials provided with the
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50 | * distribution.
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51 | *
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52 | * * Neither the name of Christoph Pfisterer nor the names of the
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53 | * contributors may be used to endorse or promote products derived
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54 | * from this software without specific prior written permission.
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55 | *
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56 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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57 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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58 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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59 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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60 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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61 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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62 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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63 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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64 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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65 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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66 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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67 | */
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68 |
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69 | #include "fsw_efi.h"
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70 |
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71 |
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72 | //
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73 | // time conversion
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74 | //
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75 | // Adopted from public domain code in FreeBSD libc.
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76 | //
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77 |
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78 | #define SECSPERMIN 60
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79 | #define MINSPERHOUR 60
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80 | #define HOURSPERDAY 24
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81 | #define DAYSPERWEEK 7
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82 | #define DAYSPERNYEAR 365
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83 | #define DAYSPERLYEAR 366
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84 | #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
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85 | #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
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86 | #define MONSPERYEAR 12
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87 |
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88 | #define EPOCH_YEAR 1970
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89 | #define EPOCH_WDAY TM_THURSDAY
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90 |
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91 | #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
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92 | #define LEAPS_THRU_END_OF(y) ((y) / 4 - (y) / 100 + (y) / 400)
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93 |
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94 | static const int mon_lengths[2][MONSPERYEAR] = {
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95 | { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
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96 | { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
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97 | };
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98 | static const int year_lengths[2] = {
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99 | DAYSPERNYEAR, DAYSPERLYEAR
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100 | };
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101 |
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102 | VOID fsw_efi_decode_time(OUT EFI_TIME *EfiTime, IN UINT32 UnixTime)
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103 | {
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104 | long days, rem;
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105 | int y, newy, yleap;
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106 | const int *ip;
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107 |
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108 | ZeroMem(EfiTime, sizeof(EFI_TIME));
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109 |
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110 | days = UnixTime / SECSPERDAY;
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111 | rem = UnixTime % SECSPERDAY;
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112 |
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113 | EfiTime->Hour = (UINT8) (rem / SECSPERHOUR);
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114 | rem = rem % SECSPERHOUR;
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115 | EfiTime->Minute = (UINT8) (rem / SECSPERMIN);
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116 | EfiTime->Second = (UINT8) (rem % SECSPERMIN);
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117 |
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118 | y = EPOCH_YEAR;
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119 | while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) {
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120 | newy = y + days / DAYSPERNYEAR;
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121 | if (days < 0)
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122 | --newy;
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123 | days -= (newy - y) * DAYSPERNYEAR +
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124 | LEAPS_THRU_END_OF(newy - 1) -
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125 | LEAPS_THRU_END_OF(y - 1);
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126 | y = newy;
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127 | }
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128 | EfiTime->Year = (UINT16)y;
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129 | ip = mon_lengths[yleap];
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130 | for (EfiTime->Month = 0; days >= (long) ip[EfiTime->Month]; ++(EfiTime->Month))
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131 | days = days - (long) ip[EfiTime->Month];
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132 | EfiTime->Month++; // adjust range to EFI conventions
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133 | EfiTime->Day = (UINT8) (days + 1);
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134 | }
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135 |
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136 | //
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137 | // String functions, used for file and volume info
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138 | //
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139 |
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140 | UINTN fsw_efi_strsize(struct fsw_string *s)
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141 | {
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142 | if (s->type == FSW_STRING_TYPE_EMPTY)
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143 | return sizeof(CHAR16);
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144 | return (s->len + 1) * sizeof(CHAR16);
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145 | }
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146 |
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147 | VOID fsw_efi_strcpy(CHAR16 *Dest, struct fsw_string *src)
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148 | {
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149 | if (src->type == FSW_STRING_TYPE_EMPTY) {
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150 | Dest[0] = 0;
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151 | } else if (src->type == FSW_STRING_TYPE_UTF16) {
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152 | CopyMem(Dest, src->data, src->size);
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153 | Dest[src->len] = 0;
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154 | } else {
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155 | /// @todo coerce, recurse
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156 | Dest[0] = 0;
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157 | }
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158 | }
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159 |
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160 | #ifdef VBOX
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161 | int fsw_streq_ISO88591_UTF16(void *s1data, void *s2data, int len)
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162 | {
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163 | int i;
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164 | fsw_u8 *p1 = (fsw_u8 *)s1data;
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165 | fsw_u16 *p2 = (fsw_u16 *)s2data;
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166 |
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167 | for (i = 0; i<len; i++)
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168 | {
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169 | if (fsw_to_lower(p1[i]) != fsw_to_lower(p2[i]))
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170 | {
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171 | return 0;
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172 | }
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173 | }
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174 |
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175 | return 1;
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176 | }
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177 | #endif
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178 |
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179 | // EOF
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