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