117 lines
3 KiB
C
117 lines
3 KiB
C
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/*
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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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/* Convert a (possibly null-terminated) UTF-8 string of at most SRCSIZE
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bytes (if SRCSIZE is -1, it is ignored) in length to a UTF-16 string.
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Return the number of characters converted. DEST must be able to hold
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at least DESTSIZE characters. If an invalid sequence is found, return -1.
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If SRCEND is not NULL, then *SRCEND is set to the next byte after the
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last byte used in SRC. */
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#include <grub/charset.h>
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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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{
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grub_uint16_t *p = dest;
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int count = 0;
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grub_uint32_t code = 0;
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if (srcend)
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*srcend = src;
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while (srcsize && destsize)
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{
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grub_uint32_t c = *src++;
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if (srcsize != (grub_size_t)-1)
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srcsize--;
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if (count)
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{
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if ((c & GRUB_UINT8_2_LEADINGBITS) != GRUB_UINT8_1_LEADINGBIT)
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{
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/* invalid */
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return -1;
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}
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else
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{
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code <<= 6;
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code |= (c & GRUB_UINT8_6_TRAILINGBITS);
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count--;
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}
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}
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else
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{
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if (c == 0)
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break;
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if ((c & GRUB_UINT8_1_LEADINGBIT) == 0)
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code = c;
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else if ((c & GRUB_UINT8_3_LEADINGBITS) == GRUB_UINT8_2_LEADINGBITS)
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{
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count = 1;
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code = c & GRUB_UINT8_5_TRAILINGBITS;
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}
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else if ((c & GRUB_UINT8_4_LEADINGBITS) == GRUB_UINT8_3_LEADINGBITS)
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{
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count = 2;
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code = c & GRUB_UINT8_4_TRAILINGBITS;
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}
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else if ((c & GRUB_UINT8_5_LEADINGBITS) == GRUB_UINT8_4_LEADINGBITS)
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{
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count = 3;
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code = c & GRUB_UINT8_3_TRAILINGBITS;
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}
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else if ((c & GRUB_UINT8_6_LEADINGBITS) == GRUB_UINT8_5_LEADINGBITS)
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{
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count = 4;
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code = c & GRUB_UINT8_2_TRAILINGBITS;
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}
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else if ((c & GRUB_UINT8_7_LEADINGBITS) == GRUB_UINT8_6_LEADINGBITS)
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{
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count = 5;
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code = c & GRUB_UINT8_1_TRAILINGBIT;
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}
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else
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return -1;
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}
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if (count == 0)
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{
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if (destsize < 2 && code >= GRUB_UCS2_LIMIT)
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break;
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if (code >= GRUB_UCS2_LIMIT)
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{
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*p++ = GRUB_UTF16_UPPER_SURROGATE (code);
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*p++ = GRUB_UTF16_LOWER_SURROGATE (code);
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destsize -= 2;
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}
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else
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{
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*p++ = code;
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destsize--;
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}
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}
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}
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if (srcend)
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*srcend = src;
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return p - dest;
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}
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