mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 00:47:26 +00:00
78178bb0c9
We'll eventually want these in a few places in efi_loader, and also vsprintf. Signed-off-by: Rob Clark <robdclark@gmail.com>
101 lines
2 KiB
C
101 lines
2 KiB
C
/*
|
|
* charset conversion utils
|
|
*
|
|
* Copyright (c) 2017 Rob Clark
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <charset.h>
|
|
#include <malloc.h>
|
|
|
|
/*
|
|
* utf8/utf16 conversion mostly lifted from grub
|
|
*/
|
|
|
|
size_t utf16_strlen(const uint16_t *in)
|
|
{
|
|
size_t i;
|
|
for (i = 0; in[i]; i++);
|
|
return i;
|
|
}
|
|
|
|
size_t utf16_strnlen(const uint16_t *in, size_t count)
|
|
{
|
|
size_t i;
|
|
for (i = 0; count-- && in[i]; i++);
|
|
return i;
|
|
}
|
|
|
|
uint16_t *utf16_strcpy(uint16_t *dest, const uint16_t *src)
|
|
{
|
|
uint16_t *tmp = dest;
|
|
|
|
while ((*dest++ = *src++) != '\0')
|
|
/* nothing */;
|
|
return tmp;
|
|
|
|
}
|
|
|
|
uint16_t *utf16_strdup(const uint16_t *s)
|
|
{
|
|
uint16_t *new;
|
|
if (!s || !(new = malloc((utf16_strlen(s) + 1) * 2)))
|
|
return NULL;
|
|
utf16_strcpy(new, s);
|
|
return new;
|
|
}
|
|
|
|
/* Convert UTF-16 to UTF-8. */
|
|
uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size)
|
|
{
|
|
uint32_t code_high = 0;
|
|
|
|
while (size--) {
|
|
uint32_t code = *src++;
|
|
|
|
if (code_high) {
|
|
if (code >= 0xDC00 && code <= 0xDFFF) {
|
|
/* Surrogate pair. */
|
|
code = ((code_high - 0xD800) << 10) + (code - 0xDC00) + 0x10000;
|
|
|
|
*dest++ = (code >> 18) | 0xF0;
|
|
*dest++ = ((code >> 12) & 0x3F) | 0x80;
|
|
*dest++ = ((code >> 6) & 0x3F) | 0x80;
|
|
*dest++ = (code & 0x3F) | 0x80;
|
|
} else {
|
|
/* Error... */
|
|
*dest++ = '?';
|
|
/* *src may be valid. Don't eat it. */
|
|
src--;
|
|
}
|
|
|
|
code_high = 0;
|
|
} else {
|
|
if (code <= 0x007F) {
|
|
*dest++ = code;
|
|
} else if (code <= 0x07FF) {
|
|
*dest++ = (code >> 6) | 0xC0;
|
|
*dest++ = (code & 0x3F) | 0x80;
|
|
} else if (code >= 0xD800 && code <= 0xDBFF) {
|
|
code_high = code;
|
|
continue;
|
|
} else if (code >= 0xDC00 && code <= 0xDFFF) {
|
|
/* Error... */
|
|
*dest++ = '?';
|
|
} else if (code < 0x10000) {
|
|
*dest++ = (code >> 12) | 0xE0;
|
|
*dest++ = ((code >> 6) & 0x3F) | 0x80;
|
|
*dest++ = (code & 0x3F) | 0x80;
|
|
} else {
|
|
*dest++ = (code >> 18) | 0xF0;
|
|
*dest++ = ((code >> 12) & 0x3F) | 0x80;
|
|
*dest++ = ((code >> 6) & 0x3F) | 0x80;
|
|
*dest++ = (code & 0x3F) | 0x80;
|
|
}
|
|
}
|
|
}
|
|
|
|
return dest;
|
|
}
|