1 /*- 2 * Copyright (c) 2010 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: head/lib/libefivar/libefivar.c 307071 2016-10-11 22:30:41Z imp $"); 29 30 #include <sys/types.h> 31 #include <errno.h> 32 #include <stddef.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <unistd.h> 36 #include <sys/efi.h> 37 #include <machine/efi.h> 38 39 #include "libefivar_int.h" 40 41 #include <stdio.h> 42 43 /* 44 * If nm were converted to utf8, what what would strlen 45 * return on the resulting string? 46 */ 47 static size_t 48 utf8_len_of_ucs2(const efi_char *nm) 49 { 50 size_t len; 51 efi_char c; 52 53 len = 0; 54 while (*nm) { 55 c = *nm++; 56 if (c > 0x7ff) 57 len += 3; 58 else if (c > 0x7f) 59 len += 2; 60 else 61 len++; 62 } 63 64 return (len); 65 } 66 67 int 68 libefi_ucs2_to_utf8(const efi_char *nm, char **name) 69 { 70 size_t len, sz; 71 efi_char c; 72 char *cp; 73 int freeit = *name == NULL; 74 75 sz = utf8_len_of_ucs2(nm) + 1; 76 len = 0; 77 if (*name != NULL) 78 cp = *name; 79 else 80 cp = *name = malloc(sz); 81 if (*name == NULL) 82 return (ENOMEM); 83 84 while (*nm) { 85 c = *nm++; 86 if (c > 0x7ff) { 87 if (len++ < sz) 88 *cp++ = (char)(0xE0 | (c >> 12)); 89 if (len++ < sz) 90 *cp++ = (char)(0x80 | ((c >> 6) & 0x3f)); 91 if (len++ < sz) 92 *cp++ = (char)(0x80 | (c & 0x3f)); 93 } else if (c > 0x7f) { 94 if (len++ < sz) 95 *cp++ = (char)(0xC0 | ((c >> 6) & 0x1f)); 96 if (len++ < sz) 97 *cp++ = (char)(0x80 | (c & 0x3f)); 98 } else { 99 if (len++ < sz) 100 *cp++ = (char)(c & 0x7f); 101 } 102 } 103 104 if (len >= sz) { 105 /* Absent bugs, we'll never return EOVERFLOW */ 106 if (freeit) 107 free(*name); 108 return (EOVERFLOW); 109 } 110 *cp++ = '\0'; 111 112 return (0); 113 } 114 115 int 116 libefi_utf8_to_ucs2(const char *name, efi_char **nmp, size_t *len) 117 { 118 efi_char *nm; 119 size_t sz; 120 uint32_t ucs4; 121 int c, bytes; 122 int freeit = *nmp == NULL; 123 124 sz = strlen(name) * 2 + 2; 125 if (*nmp == NULL) 126 *nmp = malloc(sz); 127 nm = *nmp; 128 *len = sz; 129 130 ucs4 = 0; 131 bytes = 0; 132 while (sz > 1 && *name != '\0') { 133 c = *name++; 134 /* 135 * Conditionalize on the two major character types: 136 * initial and followup characters. 137 */ 138 if ((c & 0xc0) != 0x80) { 139 /* Initial characters. */ 140 if (bytes != 0) { 141 if (freeit) 142 free(nm); 143 return (EILSEQ); 144 } 145 if ((c & 0xf8) == 0xf0) { 146 ucs4 = c & 0x07; 147 bytes = 3; 148 } else if ((c & 0xf0) == 0xe0) { 149 ucs4 = c & 0x0f; 150 bytes = 2; 151 } else if ((c & 0xe0) == 0xc0) { 152 ucs4 = c & 0x1f; 153 bytes = 1; 154 } else { 155 ucs4 = c & 0x7f; 156 bytes = 0; 157 } 158 } else { 159 /* Followup characters. */ 160 if (bytes > 0) { 161 ucs4 = (ucs4 << 6) + (c & 0x3f); 162 bytes--; 163 } else if (bytes == 0) { 164 if (freeit) 165 free(nm); 166 return (EILSEQ); 167 } 168 } 169 if (bytes == 0) { 170 if (ucs4 > 0xffff) { 171 if (freeit) 172 free(nm); 173 return (EILSEQ); 174 } 175 *nm++ = (efi_char)ucs4; 176 sz -= 2; 177 } 178 } 179 if (sz < 2) { 180 if (freeit) 181 free(nm); 182 return (EDOOFUS); 183 } 184 sz -= 2; 185 *nm = 0; 186 *len -= sz; 187 return (0); 188 } 189