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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: http://www.musicpd.org
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "utf8.h"
#include "utils.h"
#include "os_compat.h"
char *latin1_to_utf8(char *dest, const char *in_latin1)
{
unsigned char *cp = (unsigned char *)dest;
const unsigned char *latin1 = (const unsigned char *)in_latin1;
while (*latin1) {
if (*latin1 < 128)
*(cp++) = *latin1;
else {
if (*latin1 < 192) {
*(cp++) = 194;
*(cp++) = *latin1;
} else {
*(cp++) = 195;
*(cp++) = (*latin1) - 64;
}
}
++latin1;
}
*cp = '\0';
return dest;
}
char *latin1StrToUtf8Dup(const char *latin1)
{
/* utf8 should have at most two char's per latin1 char */
char *ret = xmalloc(strlen(latin1) * 2 + 1);
ret = latin1_to_utf8(ret, latin1);
return ((ret) ? xrealloc(ret, strlen((char *)ret) + 1) : NULL);
}
static char utf8_to_latin1_char(const char *inUtf8)
{
unsigned char c = 0;
const unsigned char *utf8 = (const unsigned char *)inUtf8;
if (utf8[0] < 128)
return utf8[0];
else if (utf8[0] == 195)
c += 64;
else if (utf8[0] != 194)
return '?';
return (char)(c + utf8[1]);
}
static int validateUtf8Char(const char *inUtf8Char)
{
const unsigned char *utf8Char = (const unsigned char *)inUtf8Char;
if (utf8Char[0] < 0x80)
return 1;
if (utf8Char[0] >= 0xC0 && utf8Char[0] <= 0xFD) {
int count = 1;
char t = 1 << 5;
int i;
while (count < 6 && (t & utf8Char[0])) {
t = (t >> 1);
count++;
}
if (count > 5)
return 0;
for (i = 1; i <= count; i++) {
if (utf8Char[i] < 0x80 || utf8Char[i] > 0xBF)
return 0;
}
return count + 1;
} else
return 0;
}
int validUtf8String(const char *string)
{
int ret;
while (*string) {
ret = validateUtf8Char(string);
if (0 == ret)
return 0;
string += ret;
}
return 1;
}
char *utf8StrToLatin1Dup(const char *utf8)
{
/* utf8 should have at most two char's per latin1 char */
char *ret = xmalloc(strlen(utf8) + 1);
char *cp = ret;
int count;
size_t len = 0;
while (*utf8) {
count = validateUtf8Char(utf8);
if (!count) {
free(ret);
return NULL;
}
*(cp++) = utf8_to_latin1_char(utf8);
utf8 += count;
len++;
}
*cp = '\0';
return xrealloc(ret, len + 1);
}
char *utf8_to_latin1(char *dest, const char *utf8)
{
char *cp = dest;
int count;
size_t len = 0;
while (*utf8) {
count = validateUtf8Char(utf8);
if (count) {
*(cp++) = utf8_to_latin1_char(utf8);
utf8 += count;
len++;
} else
return NULL;
}
*cp = '\0';
return dest;
}
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