/*
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* charset conversion utils
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*
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* Copyright (c) 2017 Rob Clark
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <charset.h>
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#include <malloc.h>
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/*
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* utf8/utf16 conversion mostly lifted from grub
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*/
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size_t utf16_strlen(const uint16_t *in)
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{
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size_t i;
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for (i = 0; in[i]; i++);
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return i;
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}
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size_t utf16_strnlen(const uint16_t *in, size_t count)
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{
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size_t i;
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for (i = 0; count-- && in[i]; i++);
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return i;
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}
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uint16_t *utf16_strcpy(uint16_t *dest, const uint16_t *src)
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{
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uint16_t *tmp = dest;
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while ((*dest++ = *src++) != '\0')
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/* nothing */;
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return tmp;
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}
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uint16_t *utf16_strdup(const uint16_t *s)
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{
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uint16_t *new;
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if (!s || !(new = malloc((utf16_strlen(s) + 1) * 2)))
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return NULL;
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utf16_strcpy(new, s);
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return new;
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}
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/* Convert UTF-16 to UTF-8. */
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uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size)
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{
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uint32_t code_high = 0;
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while (size--) {
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uint32_t code = *src++;
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if (code_high) {
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if (code >= 0xDC00 && code <= 0xDFFF) {
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/* Surrogate pair. */
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code = ((code_high - 0xD800) << 10) + (code - 0xDC00) + 0x10000;
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*dest++ = (code >> 18) | 0xF0;
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*dest++ = ((code >> 12) & 0x3F) | 0x80;
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*dest++ = ((code >> 6) & 0x3F) | 0x80;
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*dest++ = (code & 0x3F) | 0x80;
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} else {
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/* Error... */
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*dest++ = '?';
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/* *src may be valid. Don't eat it. */
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src--;
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}
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code_high = 0;
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} else {
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if (code <= 0x007F) {
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*dest++ = code;
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} else if (code <= 0x07FF) {
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*dest++ = (code >> 6) | 0xC0;
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*dest++ = (code & 0x3F) | 0x80;
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} else if (code >= 0xD800 && code <= 0xDBFF) {
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code_high = code;
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continue;
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} else if (code >= 0xDC00 && code <= 0xDFFF) {
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/* Error... */
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*dest++ = '?';
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} else if (code < 0x10000) {
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*dest++ = (code >> 12) | 0xE0;
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*dest++ = ((code >> 6) & 0x3F) | 0x80;
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*dest++ = (code & 0x3F) | 0x80;
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} else {
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*dest++ = (code >> 18) | 0xF0;
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*dest++ = ((code >> 12) & 0x3F) | 0x80;
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*dest++ = ((code >> 6) & 0x3F) | 0x80;
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*dest++ = (code & 0x3F) | 0x80;
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}
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}
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}
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return dest;
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}
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