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grub/include/grub/charset.h
Vladimir 'phcoder' Serbinenko d2fcfb0cef * include/grub/charset.h (GRUB_UTF16_UPPER_SURROGATE): Fix mask sizes. 
(GRUB_UTF16_LOWER_SURROGATE): Likewise.
	(grub_utf16_to_utf8): Likewise.
2012-05-14 10:18:42 +02:00

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GRUB_CHARSET_HEADER
#define GRUB_CHARSET_HEADER 1
#include <grub/types.h>
#define GRUB_UINT8_1_LEADINGBIT 0x80
#define GRUB_UINT8_2_LEADINGBITS 0xc0
#define GRUB_UINT8_3_LEADINGBITS 0xe0
#define GRUB_UINT8_4_LEADINGBITS 0xf0
#define GRUB_UINT8_5_LEADINGBITS 0xf8
#define GRUB_UINT8_6_LEADINGBITS 0xfc
#define GRUB_UINT8_7_LEADINGBITS 0xfe
#define GRUB_UINT8_1_TRAILINGBIT 0x01
#define GRUB_UINT8_2_TRAILINGBITS 0x03
#define GRUB_UINT8_3_TRAILINGBITS 0x07
#define GRUB_UINT8_4_TRAILINGBITS 0x0f
#define GRUB_UINT8_5_TRAILINGBITS 0x1f
#define GRUB_UINT8_6_TRAILINGBITS 0x3f
#define GRUB_MAX_UTF8_PER_UTF16 4
/* You need at least one UTF-8 byte to have one UTF-16 word.
You need at least three UTF-8 bytes to have 2 UTF-16 words (surrogate pairs).
*/
#define GRUB_MAX_UTF16_PER_UTF8 1
#define GRUB_UCS2_LIMIT 0x10000
#define GRUB_UTF16_UPPER_SURROGATE(code) \
(0xD800 | ((((code) - GRUB_UCS2_LIMIT) >> 10) & 0x3ff))
#define GRUB_UTF16_LOWER_SURROGATE(code) \
(0xDC00 | (((code) - GRUB_UCS2_LIMIT) & 0x3ff))
/* Process one character from UTF8 sequence.
At beginning set *code = 0, *count = 0. Returns 0 on failure and
1 on success. *count holds the number of trailing bytes. */
static inline int
grub_utf8_process (grub_uint8_t c, grub_uint32_t *code, int *count)
{
if (*count)
{
if ((c & GRUB_UINT8_2_LEADINGBITS) != GRUB_UINT8_1_LEADINGBIT)
{
*count = 0;
/* invalid */
return 0;
}
else
{
*code <<= 6;
*code |= (c & GRUB_UINT8_6_TRAILINGBITS);
(*count)--;
return 1;
}
}
if ((c & GRUB_UINT8_1_LEADINGBIT) == 0)
{
*code = c;
return 1;
}
if ((c & GRUB_UINT8_3_LEADINGBITS) == GRUB_UINT8_2_LEADINGBITS)
{
*count = 1;
*code = c & GRUB_UINT8_5_TRAILINGBITS;
return 1;
}
if ((c & GRUB_UINT8_4_LEADINGBITS) == GRUB_UINT8_3_LEADINGBITS)
{
*count = 2;
*code = c & GRUB_UINT8_4_TRAILINGBITS;
return 1;
}
if ((c & GRUB_UINT8_5_LEADINGBITS) == GRUB_UINT8_4_LEADINGBITS)
{
*count = 3;
*code = c & GRUB_UINT8_3_TRAILINGBITS;
return 1;
}
return 0;
}
/* Convert a (possibly null-terminated) UTF-8 string of at most SRCSIZE
bytes (if SRCSIZE is -1, it is ignored) in length to a UTF-16 string.
Return the number of characters converted. DEST must be able to hold
at least DESTSIZE characters. If an invalid sequence is found, return -1.
If SRCEND is not NULL, then *SRCEND is set to the next byte after the
last byte used in SRC. */
static inline grub_size_t
grub_utf8_to_utf16 (grub_uint16_t *dest, grub_size_t destsize,
const grub_uint8_t *src, grub_size_t srcsize,
const grub_uint8_t **srcend)
{
grub_uint16_t *p = dest;
int count = 0;
grub_uint32_t code = 0;
if (srcend)
*srcend = src;
while (srcsize && destsize)
{
int was_count = count;
if (srcsize != (grub_size_t)-1)
srcsize--;
if (!grub_utf8_process (*src++, &code, &count))
{
code = '?';
count = 0;
/* Character c may be valid, don't eat it. */
if (was_count)
src--;
}
if (count != 0)
continue;
if (code == 0)
break;
if (destsize < 2 && code >= GRUB_UCS2_LIMIT)
break;
if (code >= GRUB_UCS2_LIMIT)
{
*p++ = GRUB_UTF16_UPPER_SURROGATE (code);
*p++ = GRUB_UTF16_LOWER_SURROGATE (code);
destsize -= 2;
}
else
{
*p++ = code;
destsize--;
}
}
if (srcend)
*srcend = src;
return p - dest;
}
/* Determine the last position where the UTF-8 string [beg, end) can
be safely cut. */
static inline grub_size_t
grub_getend (const char *beg, const char *end)
{
const char *ptr;
for (ptr = end - 1; ptr >= beg; ptr--)
if ((*ptr & GRUB_UINT8_2_LEADINGBITS) != GRUB_UINT8_1_LEADINGBIT)
break;
if (ptr < beg)
return 0;
if ((*ptr & GRUB_UINT8_1_LEADINGBIT) == 0)
return ptr + 1 - beg;
if ((*ptr & GRUB_UINT8_3_LEADINGBITS) == GRUB_UINT8_2_LEADINGBITS
&& ptr + 2 <= end)
return ptr + 2 - beg;
if ((*ptr & GRUB_UINT8_4_LEADINGBITS) == GRUB_UINT8_3_LEADINGBITS
&& ptr + 3 <= end)
return ptr + 3 - beg;
if ((*ptr & GRUB_UINT8_5_LEADINGBITS) == GRUB_UINT8_4_LEADINGBITS
&& ptr + 4 <= end)
return ptr + 4 - beg;
/* Invalid character or incomplete. Cut before it. */
return ptr - beg;
}
/* Convert UTF-16 to UTF-8. */
static inline grub_uint8_t *
grub_utf16_to_utf8 (grub_uint8_t *dest, const grub_uint16_t *src,
grub_size_t size)
{
grub_uint32_t code_high = 0;
while (size--)
{
grub_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;
}
#define GRUB_MAX_UTF8_PER_LATIN1 2
/* Convert Latin1 to UTF-8. */
static inline grub_uint8_t *
grub_latin1_to_utf8 (grub_uint8_t *dest, const grub_uint8_t *src,
grub_size_t size)
{
while (size--)
{
if (!(*src & 0x80))
*dest++ = *src;
else
{
*dest++ = (*src >> 6) | 0xC0;
*dest++ = (*src & 0x3F) | 0x80;
}
src++;
}
return dest;
}
/* Convert UCS-4 to UTF-8. */
char *grub_ucs4_to_utf8_alloc (const grub_uint32_t *src, grub_size_t size);
int
grub_is_valid_utf8 (const grub_uint8_t *src, grub_size_t srcsize);
grub_ssize_t grub_utf8_to_ucs4_alloc (const char *msg,
grub_uint32_t **unicode_msg,
grub_uint32_t **last_position);
/* Returns the number of bytes the string src would occupy is converted
to UTF-8, excluding \0. */
grub_size_t
grub_get_num_of_utf8_bytes (const grub_uint32_t *src, grub_size_t size);
/* Converts UCS-4 to UTF-8. Returns the number of bytes effectively written
excluding the trailing \0. */
grub_size_t
grub_ucs4_to_utf8 (const grub_uint32_t *src, grub_size_t size,
grub_uint8_t *dest, grub_size_t destsize);
grub_size_t grub_utf8_to_ucs4 (grub_uint32_t *dest, grub_size_t destsize,
const grub_uint8_t *src, grub_size_t srcsize,
const grub_uint8_t **srcend);
/* Returns -2 if not enough space, -1 on invalid character. */
grub_ssize_t
grub_encode_utf8_character (grub_uint8_t *dest, grub_uint8_t *destend,
grub_uint32_t code);
const grub_uint32_t *
grub_unicode_get_comb_start (const grub_uint32_t *str,
const grub_uint32_t *cur);
#endif
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