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 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