/* the Music Player Daemon (MPD)
 * (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
 * 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 "charConv.h"

#include <stdlib.h>
#include <errno.h>
#include <string.h>

#ifdef HAVE_ICONV
#include <iconv.h>
iconv_t char_conv_iconv;
char * char_conv_to = NULL;
char * char_conv_from = NULL;
#endif

#define BUFFER_SIZE	1024

int setCharSetConversion(char * to, char * from) {
#ifdef HAVE_ICONV
	if(char_conv_to && strcmp(to,char_conv_to)==0 &&
			char_conv_from && strcmp(from,char_conv_from)==0)
	{ 
		return 0;
	}

	closeCharSetConversion();

	if((char_conv_iconv = iconv_open(to,from))==(iconv_t)(-1)) return -1;

	char_conv_to = strdup(to);
	char_conv_from = strdup(from);

	return 0;
#endif
	return -1;
}

char * convStrDup(char * string) {
#ifdef HAVE_ICONV
	char buffer[BUFFER_SIZE];
	size_t inleft = strlen(string);
	char * ret;
	size_t outleft;
	size_t retlen = 0;
	size_t err;
	char * bufferPtr;

	if(!char_conv_to) return NULL;

	ret = malloc(1);
	ret[0] = '\0';

	while(inleft) {
		bufferPtr = buffer;
		outleft = BUFFER_SIZE;
		err = iconv(char_conv_iconv,&string,&inleft,&bufferPtr,
					&outleft);
		if(outleft==BUFFER_SIZE || (err<0 && errno!=E2BIG)) {
			free(ret);
			return NULL;
		}

		ret = realloc(ret,retlen+BUFFER_SIZE-outleft+1);
		memcpy(ret+retlen,buffer,BUFFER_SIZE-outleft);
		retlen+=BUFFER_SIZE-outleft;
		ret[retlen] = '\0';
	}

	return ret;
#endif
	return NULL;
}

void closeCharSetConversion() {
#ifdef HAVE_ICONV
	if(char_conv_to) {
		iconv_close(char_conv_iconv);
		free(char_conv_to);
		free(char_conv_from);
		char_conv_to = NULL;
		char_conv_from = NULL;
	}
#endif
}