6fbdc721d9
[ew: cleaned up the dirty union hack a bit] Signed-off-by: Eric Wong <normalperson@yhbt.net> git-svn-id: https://svn.musicpd.org/mpd/trunk@7180 09075e82-0dd4-0310-85a5-a0d7c8717e4f
155 lines
3.2 KiB
C
155 lines
3.2 KiB
C
/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* This project's homepage is: http://www.musicpd.org
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "utf8.h"
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#include "utils.h"
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#include "os_compat.h"
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char *latin1_to_utf8(char *dest, const char *in_latin1)
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{
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unsigned char *cp = (unsigned char *)dest;
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const unsigned char *latin1 = (const unsigned char *)in_latin1;
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while (*latin1) {
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if (*latin1 < 128)
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*(cp++) = *latin1;
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else {
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if (*latin1 < 192) {
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*(cp++) = 194;
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*(cp++) = *latin1;
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} else {
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*(cp++) = 195;
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*(cp++) = (*latin1) - 64;
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}
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}
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++latin1;
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}
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*cp = '\0';
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return dest;
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}
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char *latin1StrToUtf8Dup(const char *latin1)
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{
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/* utf8 should have at most two char's per latin1 char */
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char *ret = xmalloc(strlen(latin1) * 2 + 1);
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ret = latin1_to_utf8(ret, latin1);
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return ((ret) ? xrealloc(ret, strlen((char *)ret) + 1) : NULL);
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}
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static char utf8_to_latin1_char(const char *inUtf8)
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{
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unsigned char c = 0;
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const unsigned char *utf8 = (const unsigned char *)inUtf8;
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if (utf8[0] < 128)
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return utf8[0];
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else if (utf8[0] == 195)
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c += 64;
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else if (utf8[0] != 194)
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return '?';
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return (char)(c + utf8[1]);
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}
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static int validateUtf8Char(const char *inUtf8Char)
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{
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const unsigned char *utf8Char = (const unsigned char *)inUtf8Char;
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if (utf8Char[0] < 0x80)
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return 1;
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if (utf8Char[0] >= 0xC0 && utf8Char[0] <= 0xFD) {
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int count = 1;
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char t = 1 << 5;
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int i;
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while (count < 6 && (t & utf8Char[0])) {
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t = (t >> 1);
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count++;
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}
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if (count > 5)
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return 0;
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for (i = 1; i <= count; i++) {
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if (utf8Char[i] < 0x80 || utf8Char[i] > 0xBF)
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return 0;
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}
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return count + 1;
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} else
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return 0;
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}
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int validUtf8String(const char *string)
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{
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int ret;
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while (*string) {
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ret = validateUtf8Char(string);
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if (0 == ret)
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return 0;
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string += ret;
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}
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return 1;
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}
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char *utf8StrToLatin1Dup(const char *utf8)
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{
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/* utf8 should have at most two char's per latin1 char */
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char *ret = xmalloc(strlen(utf8) + 1);
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char *cp = ret;
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int count;
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size_t len = 0;
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while (*utf8) {
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count = validateUtf8Char(utf8);
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if (!count) {
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free(ret);
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return NULL;
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}
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*(cp++) = utf8_to_latin1_char(utf8);
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utf8 += count;
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len++;
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}
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*cp = '\0';
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return xrealloc(ret, len + 1);
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}
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char *utf8_to_latin1(char *dest, const char *utf8)
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{
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char *cp = dest;
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int count;
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size_t len = 0;
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while (*utf8) {
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count = validateUtf8Char(utf8);
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if (count) {
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*(cp++) = utf8_to_latin1_char(utf8);
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utf8 += count;
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len++;
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} else
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return NULL;
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}
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*cp = '\0';
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return dest;
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}
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