1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without
7 * restriction, including without limitation the rights to use, copy,
8 * modify, merge, publish, distribute, sublicense, and/or sell copies
9 * of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24
25 #include "uefi_avb_util.h"
26
uefi_avb_utf8_to_ucs2(const uint8_t * utf8_data,size_t utf8_num_bytes,uint16_t * ucs2_data,size_t ucs2_data_capacity_num_bytes,size_t * out_ucs2_data_num_bytes)27 bool uefi_avb_utf8_to_ucs2(const uint8_t* utf8_data,
28 size_t utf8_num_bytes,
29 uint16_t* ucs2_data,
30 size_t ucs2_data_capacity_num_bytes,
31 size_t* out_ucs2_data_num_bytes) {
32 uint32_t i8 = 0;
33 uint32_t i2 = 0;
34
35 do {
36 if (i2 >= ucs2_data_capacity_num_bytes) {
37 break;
38 }
39
40 // cannot represent this character, too long
41 if ((utf8_data[i8] & 0xF8) == 0xF0) {
42 return false;
43 } else if ((utf8_data[i8] & 0xF0) == 0xE0) {
44 ucs2_data[i2] = (uint16_t)((uint16_t)utf8_data[i8] << 12) |
45 (uint16_t)(((uint16_t)utf8_data[i8 + 1] << 6) & 0x0FC0) |
46 (uint16_t)((uint16_t)utf8_data[i8 + 2] & 0x003F);
47 i8 += 3;
48 } else if ((utf8_data[i8] & 0xE0) == 0XC0) {
49 ucs2_data[i2] = (uint16_t)(((uint16_t)utf8_data[i8] << 6) & 0x07C0) |
50 (uint16_t)((uint16_t)utf8_data[i8 + 1] & 0x003F);
51 i8 += 2;
52 } else if (!(utf8_data[i8] >> 7)) {
53 ucs2_data[i2] = (uint16_t)((uint16_t)utf8_data[i8] & 0x00FF);
54 i8++;
55 } else {
56 // invalid utf-8
57 return false;
58 }
59 i2++;
60 } while (i8 < utf8_num_bytes);
61
62 if (out_ucs2_data_num_bytes != NULL) {
63 *out_ucs2_data_num_bytes = i2 * 2;
64 }
65 return true;
66 }
67