128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GRUB_CHARSET_HEADER
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#define GRUB_CHARSET_HEADER 1
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#include <grub/types.h>
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#define GRUB_UINT8_1_LEADINGBIT 0x80
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#define GRUB_UINT8_2_LEADINGBITS 0xc0
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#define GRUB_UINT8_3_LEADINGBITS 0xe0
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#define GRUB_UINT8_4_LEADINGBITS 0xf0
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#define GRUB_UINT8_5_LEADINGBITS 0xf8
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#define GRUB_UINT8_6_LEADINGBITS 0xfc
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#define GRUB_UINT8_7_LEADINGBITS 0xfe
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#define GRUB_UINT8_1_TRAILINGBIT 0x01
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#define GRUB_UINT8_2_TRAILINGBITS 0x03
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#define GRUB_UINT8_3_TRAILINGBITS 0x07
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#define GRUB_UINT8_4_TRAILINGBITS 0x0f
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#define GRUB_UINT8_5_TRAILINGBITS 0x1f
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#define GRUB_UINT8_6_TRAILINGBITS 0x3f
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#define GRUB_UCS2_LIMIT 0x10000
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#define GRUB_UTF16_UPPER_SURROGATE(code) \
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(0xD800 + ((((code) - GRUB_UCS2_LIMIT) >> 12) & 0xfff))
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#define GRUB_UTF16_LOWER_SURROGATE(code) \
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(0xDC00 + (((code) - GRUB_UCS2_LIMIT) & 0xfff))
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grub_ssize_t
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grub_utf8_to_utf16 (grub_uint16_t *dest, grub_size_t destsize,
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const grub_uint8_t *src, grub_size_t srcsize,
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const grub_uint8_t **srcend);
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/* Convert UTF-16 to UTF-8. */
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static inline grub_uint8_t *
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grub_utf16_to_utf8 (grub_uint8_t *dest, grub_uint16_t *src,
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grub_size_t size)
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{
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grub_uint32_t code_high = 0;
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while (size--)
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{
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grub_uint32_t code = *src++;
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if (code_high)
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{
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if (code >= 0xDC00 && code <= 0xDFFF)
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{
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/* Surrogate pair. */
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code = ((code_high - 0xD800) << 12) + (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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}
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else
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{
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/* Error... */
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*dest++ = '?';
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}
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code_high = 0;
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}
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else
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{
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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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{
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*dest++ = (code >> 6) | 0xC0;
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*dest++ = (code & 0x3F) | 0x80;
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}
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else if (code >= 0xD800 && code <= 0xDBFF)
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{
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code_high = code;
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continue;
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}
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else if (code >= 0xDC00 && code <= 0xDFFF)
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{
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/* Error... */
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*dest++ = '?';
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}
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else
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{
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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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}
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}
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}
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return dest;
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}
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/* Convert UCS-4 to UTF-8. */
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char *grub_ucs4_to_utf8_alloc (grub_uint32_t *src, grub_size_t size);
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int
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grub_is_valid_utf8 (const grub_uint8_t *src, grub_size_t srcsize);
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int grub_utf8_to_ucs4_alloc (const char *msg, grub_uint32_t **unicode_msg,
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grub_uint32_t **last_position);
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void
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grub_ucs4_to_utf8 (grub_uint32_t *src, grub_size_t size,
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grub_uint8_t *dest, grub_size_t destsize);
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grub_size_t grub_utf8_to_ucs4 (grub_uint32_t *dest, grub_size_t destsize,
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const grub_uint8_t *src, grub_size_t srcsize,
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const grub_uint8_t **srcend);
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#endif
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