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efi_loader: new function utf8_to_utf16

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Provide a conversion function from utf8 to utf16.

Add missing #include <linux/types.h> in include/charset.h.
Remove superfluous #include <common.h> in lib/charset.c.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt
2017-10-18 18:13:06 +02:00
committed by Alexander Graf
parent 30a0045a54
commit f58c5ecb87
2 changed files with 71 additions and 1 deletions
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57
lib/charset.c
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@ -6,7 +6,6 @@
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <charset.h>
#include <malloc.h>
@ -99,3 +98,59 @@ uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size)
return dest;
}
uint16_t *utf8_to_utf16(uint16_t *dest, const uint8_t *src, size_t size)
{
while (size--) {
int extension_bytes;
uint32_t code;
extension_bytes = 0;
if (*src <= 0x7f) {
code = *src++;
/* Exit on zero byte */
if (!code)
size = 0;
} else if (*src <= 0xbf) {
/* Illegal code */
code = '?';
} else if (*src <= 0xdf) {
code = *src++ & 0x1f;
extension_bytes = 1;
} else if (*src <= 0xef) {
code = *src++ & 0x0f;
extension_bytes = 2;
} else if (*src <= 0xf7) {
code = *src++ & 0x07;
extension_bytes = 3;
} else {
/* Illegal code */
code = '?';
}
for (; extension_bytes && size; --size, --extension_bytes) {
if ((*src & 0xc0) == 0x80) {
code <<= 6;
code |= *src++ & 0x3f;
} else {
/* Illegal code */
code = '?';
++src;
--size;
break;
}
}
if (code < 0x10000) {
*dest++ = code;
} else {
/*
* Simplified expression for
* (((code - 0x10000) >> 10) & 0x3ff) | 0xd800
*/
*dest++ = (code >> 10) + 0xd7c0;
*dest++ = (code & 0x3ff) | 0xdc00;
}
}
return dest;
}