1 /* 2 * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <assert.h> 32 #include <debug.h> 33 #include <errno.h> 34 #include <gpt.h> 35 #include <string.h> 36 37 static int unicode_to_ascii(unsigned short *str_in, unsigned char *str_out) 38 { 39 uint8_t *name = (uint8_t *)str_in; 40 int i; 41 42 assert((str_in != NULL) && (str_out != NULL) && (name[0] != '\0')); 43 44 /* check whether the unicode string is valid */ 45 for (i = 1; i < (EFI_NAMELEN << 1); i += 2) { 46 if (name[i] != '\0') 47 return -EINVAL; 48 } 49 /* convert the unicode string to ascii string */ 50 for (i = 0; i < (EFI_NAMELEN << 1); i += 2) { 51 str_out[i >> 1] = name[i]; 52 if (name[i] == '\0') 53 break; 54 } 55 return 0; 56 } 57 58 int parse_gpt_entry(gpt_entry_t *gpt_entry, partition_entry_t *entry) 59 { 60 int result; 61 62 assert((gpt_entry != 0) && (entry != 0)); 63 64 if ((gpt_entry->first_lba == 0) && (gpt_entry->last_lba == 0)) { 65 return -EINVAL; 66 } 67 68 memset(entry, 0, sizeof(partition_entry_t)); 69 result = unicode_to_ascii(gpt_entry->name, (uint8_t *)entry->name); 70 if (result != 0) { 71 return result; 72 } 73 entry->start = (uint64_t)gpt_entry->first_lba * PARTITION_BLOCK_SIZE; 74 entry->length = (uint64_t)(gpt_entry->last_lba - 75 gpt_entry->first_lba + 1) * 76 PARTITION_BLOCK_SIZE; 77 return 0; 78 } 79