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67 lines
2.4 KiB
67 lines
2.4 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "uefi_avb_util.h"
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bool uefi_avb_utf8_to_ucs2(const uint8_t* utf8_data,
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size_t utf8_num_bytes,
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uint16_t* ucs2_data,
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size_t ucs2_data_capacity_num_bytes,
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size_t* out_ucs2_data_num_bytes) {
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uint32_t i8 = 0;
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uint32_t i2 = 0;
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do {
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if (i2 >= ucs2_data_capacity_num_bytes) {
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break;
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}
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// cannot represent this character, too long
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if ((utf8_data[i8] & 0xF8) == 0xF0) {
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return false;
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} else if ((utf8_data[i8] & 0xF0) == 0xE0) {
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ucs2_data[i2] = (uint16_t)((uint16_t)utf8_data[i8] << 12) |
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(uint16_t)(((uint16_t)utf8_data[i8 + 1] << 6) & 0x0FC0) |
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(uint16_t)((uint16_t)utf8_data[i8 + 2] & 0x003F);
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i8 += 3;
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} else if ((utf8_data[i8] & 0xE0) == 0XC0) {
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ucs2_data[i2] = (uint16_t)(((uint16_t)utf8_data[i8] << 6) & 0x07C0) |
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(uint16_t)((uint16_t)utf8_data[i8 + 1] & 0x003F);
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i8 += 2;
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} else if (!(utf8_data[i8] >> 7)) {
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ucs2_data[i2] = (uint16_t)((uint16_t)utf8_data[i8] & 0x00FF);
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i8++;
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} else {
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// invalid utf-8
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return false;
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}
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i2++;
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} while (i8 < utf8_num_bytes);
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if (out_ucs2_data_num_bytes != NULL) {
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*out_ucs2_data_num_bytes = i2 * 2;
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}
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return true;
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}
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