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// SPDX-License-Identifier: GPL-2.0+
/*
* charset conversion utils
*
* Copyright (c) 2017 Rob Clark
*/
#include <charset.h>
#include <capitalization.h>
#include <malloc.h>
static struct capitalization_table capitalization_table[] =
#ifdef CONFIG_EFI_UNICODE_CAPITALIZATION
UNICODE_CAPITALIZATION_TABLE;
#elif CONFIG_FAT_DEFAULT_CODEPAGE == 1250
CP1250_CAPITALIZATION_TABLE;
#else
CP437_CAPITALIZATION_TABLE;
#endif
s32 utf8_get(const char **src)
{
s32 code = 0;
unsigned char c;
if (!src || !*src)
return -1;
if (!**src)
return 0;
c = **src;
if (c >= 0x80) {
++*src;
if (!**src)
return -1;
/*
* We do not expect a continuation byte (0x80 - 0xbf).
* 0x80 is coded as 0xc2 0x80, so we cannot have less then 0xc2
* here.
* The highest code point is 0x10ffff which is coded as
* 0xf4 0x8f 0xbf 0xbf. So we cannot have a byte above 0xf4.
*/
if (c < 0xc2 || code > 0xf4)
return -1;
if (c >= 0xe0) {
if (c >= 0xf0) {
/* 0xf0 - 0xf4 */
c &= 0x07;
code = c << 18;
c = **src;
++*src;
if (!**src)
return -1;
if (c < 0x80 || c > 0xbf)
return -1;
c &= 0x3f;
} else {
/* 0xe0 - 0xef */
c &= 0x0f;
}
code += c << 12;
if ((code >= 0xD800 && code <= 0xDFFF) ||
code >= 0x110000)
return -1;
c = **src;
++*src;
if (!**src)
return -1;
if (c < 0x80 || c > 0xbf)
return -1;
}
/* 0xc0 - 0xdf or continuation byte (0x80 - 0xbf) */
c &= 0x3f;
code += c << 6;
c = **src;
if (c < 0x80 || c > 0xbf)
return -1;
c &= 0x3f;
}
code += c;
++*src;
return code;
}
int utf8_put(s32 code, char **dst)
{
if (!dst || !*dst)
return -1;
if ((code >= 0xD800 && code <= 0xDFFF) || code >= 0x110000)
return -1;
if (code <= 0x007F) {
**dst = code;
} else {
if (code <= 0x07FF) {
**dst = code >> 6 | 0xC0;
} else {
if (code < 0x10000) {
**dst = code >> 12 | 0xE0;
} else {
**dst = code >> 18 | 0xF0;
++*dst;
**dst = (code >> 12 & 0x3F) | 0x80;
}
++*dst;
**dst = (code >> 6 & 0x3F) | 0x80;
}
++*dst;
**dst = (code & 0x3F) | 0x80;
}
++*dst;
return 0;
}
size_t utf8_utf16_strnlen(const char *src, size_t count)
{
size_t len = 0;
for (; *src && count; --count) {
s32 code = utf8_get(&src);
if (!code)
break;
if (code < 0) {
/* Reserve space for a replacement character */
len += 1;
} else if (code < 0x10000) {
len += 1;
} else {
len += 2;
}
}
return len;
}
int utf8_utf16_strncpy(u16 **dst, const char *src, size_t count)
{
if (!src || !dst || !*dst)
return -1;
for (; count && *src; --count) {
s32 code = utf8_get(&src);
if (code < 0)
code = '?';
utf16_put(code, dst);
}
**dst = 0;
return 0;
}
s32 utf16_get(const u16 **src)
{
s32 code, code2;
if (!src || !*src)
return -1;
if (!**src)
return 0;
code = **src;
++*src;
if (code >= 0xDC00 && code <= 0xDFFF)
return -1;
if (code >= 0xD800 && code <= 0xDBFF) {
if (!**src)
return -1;
code &= 0x3ff;
code <<= 10;
code += 0x10000;
code2 = **src;
++*src;
if (code2 <= 0xDC00 || code2 >= 0xDFFF)
return -1;
code2 &= 0x3ff;
code += code2;
}
return code;
}
int utf16_put(s32 code, u16 **dst)
{
if (!dst || !*dst)
return -1;
if ((code >= 0xD800 && code <= 0xDFFF) || code >= 0x110000)
return -1;
if (code < 0x10000) {
**dst = code;
} else {
code -= 0x10000;
**dst = code >> 10 | 0xD800;
++*dst;
**dst = (code & 0x3ff) | 0xDC00;
}
++*dst;
return 0;
}
size_t utf16_strnlen(const u16 *src, size_t count)
{
size_t len = 0;
for (; *src && count; --count) {
s32 code = utf16_get(&src);
if (!code)
break;
/*
* In case of an illegal sequence still reserve space for a
* replacement character.
*/
++len;
}
return len;
}
size_t utf16_utf8_strnlen(const u16 *src, size_t count)
{
size_t len = 0;
for (; *src && count; --count) {
s32 code = utf16_get(&src);
if (!code)
break;
if (code < 0)
/* Reserve space for a replacement character */
len += 1;
else if (code < 0x80)
len += 1;
else if (code < 0x800)
len += 2;
else if (code < 0x10000)
len += 3;
else
len += 4;
}
return len;
}
int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count)
{
if (!src || !dst || !*dst)
return -1;
for (; count && *src; --count) {
s32 code = utf16_get(&src);
if (code < 0)
code = '?';
utf8_put(code, dst);
}
**dst = 0;
return 0;
}
s32 utf_to_lower(const s32 code)
{
struct capitalization_table *pos = capitalization_table;
s32 ret = code;
if (code <= 0x7f) {
if (code >= 'A' && code <= 'Z')
ret += 0x20;
return ret;
}
for (; pos->upper; ++pos) {
if (pos->upper == code) {
ret = pos->lower;
break;
}
}
return ret;
}
s32 utf_to_upper(const s32 code)
{
struct capitalization_table *pos = capitalization_table;
s32 ret = code;
if (code <= 0x7f) {
if (code >= 'a' && code <= 'z')
ret -= 0x20;
return ret;
}
for (; pos->lower; ++pos) {
if (pos->lower == code) {
ret = pos->upper;
break;
}
}
return ret;
}
size_t u16_strlen(const u16 *in)
{
size_t i;
for (i = 0; in[i]; i++);
return i;
}
size_t u16_strnlen(const u16 *in, size_t count)
{
size_t i;
for (i = 0; count-- && in[i]; i++);
return i;
}
/* 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;
}
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