David Zeuthen | d9c76c7 | 2017-01-11 15:42:04 -0500 | [diff] [blame] | 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 | } |