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/*
* libid3tag - ID3 tag manipulation library
* Copyright (C) 2000-2004 Underbit Technologies, Inc.
*
* 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
*
* $Id: genre.c,v 1.8 2004/01/23 09:41:32 rob Exp $
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# include "global.h"
# include "id3tag.h"
# include "ucs4.h"
/* genres are stored in ucs4 format */
# include "genre.dat"
# define NGENRES (sizeof(genre_table) / sizeof(genre_table[0]))
/*
* NAME: genre->index()
* DESCRIPTION: return an ID3v1 genre string indexed by number
*/
id3_ucs4_t const *id3_genre_index(unsigned int index)
{
return (index < NGENRES) ? genre_table[index] : 0;
}
/*
* NAME: genre->name()
* DESCRIPTION: translate an ID3v2 genre number/keyword to its full name
*/
id3_ucs4_t const *id3_genre_name(id3_ucs4_t const *string)
{
id3_ucs4_t const *ptr;
static id3_ucs4_t const genre_remix[] = { 'R', 'e', 'm', 'i', 'x', 0 };
static id3_ucs4_t const genre_cover[] = { 'C', 'o', 'v', 'e', 'r', 0 };
unsigned long number;
if (string == 0 || *string == 0)
return id3_ucs4_empty;
if (string[0] == 'R' && string[1] == 'X' && string[2] == 0)
return genre_remix;
if (string[0] == 'C' && string[1] == 'R' && string[2] == 0)
return genre_cover;
for (ptr = string; *ptr; ++ptr) {
if (*ptr < '0' || *ptr > '9')
return string;
}
number = id3_ucs4_getnumber(string);
return (number < NGENRES) ? genre_table[number] : string;
}
/*
* NAME: translate()
* DESCRIPTION: return a canonicalized character for testing genre equivalence
*/
static
id3_ucs4_t translate(id3_ucs4_t ch)
{
if (ch) {
if (ch >= 'A' && ch <= 'Z')
ch += 'a' - 'A';
if (ch < 'a' || ch > 'z')
ch = ID3_UCS4_REPLACEMENTCHAR;
}
return ch;
}
/*
* NAME: compare()
* DESCRIPTION: test two ucs4 genre strings for equivalence
*/
static
int compare(id3_ucs4_t const *str1, id3_ucs4_t const *str2)
{
id3_ucs4_t c1, c2;
if (str1 == str2)
return 1;
do {
do
c1 = translate(*str1++);
while (c1 == ID3_UCS4_REPLACEMENTCHAR);
do
c2 = translate(*str2++);
while (c2 == ID3_UCS4_REPLACEMENTCHAR);
}
while (c1 && c1 == c2);
return c1 == c2;
}
/*
* NAME: genre->number()
* DESCRIPTION: translate an ID3v2 genre name/number to its ID3v1 index number
*/
int id3_genre_number(id3_ucs4_t const *string)
{
id3_ucs4_t const *ptr;
int i;
if (string == 0 || *string == 0)
return -1;
for (ptr = string; *ptr; ++ptr) {
if (*ptr < '0' || *ptr > '9')
break;
}
if (*ptr == 0) {
unsigned long number;
number = id3_ucs4_getnumber(string);
return (number <= 0xff) ? number : -1;
}
for (i = 0; i < NGENRES; ++i) {
if (compare(string, genre_table[i]))
return i;
}
/* no equivalent */
return -1;
}
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