/* * This file is part of the MicroPython project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2022 Scott Shawcroft for Adafruit Industries * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "shared-module/usb/utf16le.h" STATIC void _convert_utf16le_to_utf8(const uint16_t *utf16, size_t utf16_len, uint8_t *utf8, size_t utf8_len) { // TODO: Check for runover. (void)utf8_len; for (size_t i = 0; i < utf16_len; i++) { uint16_t chr = utf16[i]; if (chr < 0x80) { *utf8++ = chr & 0xff; } else if (chr < 0x800) { *utf8++ = (uint8_t)(0xC0 | (chr >> 6 & 0x1F)); *utf8++ = (uint8_t)(0x80 | (chr >> 0 & 0x3F)); } else if (chr < 0x10000) { // TODO: Verify surrogate. *utf8++ = (uint8_t)(0xE0 | (chr >> 12 & 0x0F)); *utf8++ = (uint8_t)(0x80 | (chr >> 6 & 0x3F)); *utf8++ = (uint8_t)(0x80 | (chr >> 0 & 0x3F)); } else { // TODO: Handle UTF-16 code points that take two entries. uint32_t hc = ((chr & 0xFFFF0000) - 0xD8000000) >> 6; /* Get high 10 bits */ chr = (chr & 0xFFFF) - 0xDC00; /* Get low 10 bits */ chr = (hc | chr) + 0x10000; *utf8++ = (uint8_t)(0xF0 | (chr >> 18 & 0x07)); *utf8++ = (uint8_t)(0x80 | (chr >> 12 & 0x3F)); *utf8++ = (uint8_t)(0x80 | (chr >> 6 & 0x3F)); *utf8++ = (uint8_t)(0x80 | (chr >> 0 & 0x3F)); } } } // Count how many bytes a utf-16-le encoded string will take in utf-8. STATIC mp_int_t _count_utf8_bytes(const uint16_t *buf, size_t len) { size_t total_bytes = 0; for (size_t i = 0; i < len; i++) { uint16_t chr = buf[i]; if (chr < 0x80) { total_bytes += 1; } else if (chr < 0x800) { total_bytes += 2; } else if (chr < 0x10000) { total_bytes += 3; } else { total_bytes += 4; } } return total_bytes; } mp_obj_t utf16le_to_string(const uint16_t *buf, size_t utf16_len) { size_t size = _count_utf8_bytes(buf, utf16_len); vstr_t vstr; vstr_init_len(&vstr, size + 1); byte *p = (byte *)vstr.buf; // Null terminate. p[size] = '\0'; _convert_utf16le_to_utf8(buf, utf16_len, p, size); return mp_obj_new_str_from_vstr(&mp_type_str, &vstr); }