cannam@85: /*
cannam@85:  * libid3tag - ID3 tag manipulation library
cannam@85:  * Copyright (C) 2000-2004 Underbit Technologies, Inc.
cannam@85:  *
cannam@85:  * This program is free software; you can redistribute it and/or modify
cannam@85:  * it under the terms of the GNU General Public License as published by
cannam@85:  * the Free Software Foundation; either version 2 of the License, or
cannam@85:  * (at your option) any later version.
cannam@85:  *
cannam@85:  * This program is distributed in the hope that it will be useful,
cannam@85:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@85:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
cannam@85:  * GNU General Public License for more details.
cannam@85:  *
cannam@85:  * You should have received a copy of the GNU General Public License
cannam@85:  * along with this program; if not, write to the Free Software
cannam@85:  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
cannam@85:  *
cannam@85:  * $Id: genre.c,v 1.8 2004/01/23 09:41:32 rob Exp $
cannam@85:  */
cannam@85: 
cannam@85: # ifdef HAVE_CONFIG_H
cannam@85: #  include "config.h"
cannam@85: # endif
cannam@85: 
cannam@85: # include "global.h"
cannam@85: 
cannam@85: # include "id3tag.h"
cannam@85: # include "ucs4.h"
cannam@85: 
cannam@85: /* genres are stored in ucs4 format */
cannam@85: # include "genre.dat"
cannam@85: 
cannam@85: # define NGENRES  (sizeof(genre_table) / sizeof(genre_table[0]))
cannam@85: 
cannam@85: /*
cannam@85:  * NAME:	genre->index()
cannam@85:  * DESCRIPTION:	return an ID3v1 genre string indexed by number
cannam@85:  */
cannam@85: id3_ucs4_t const *id3_genre_index(unsigned int index)
cannam@85: {
cannam@85:   return (index < NGENRES) ? genre_table[index] : 0;
cannam@85: }
cannam@85: 
cannam@85: /*
cannam@85:  * NAME:	genre->name()
cannam@85:  * DESCRIPTION:	translate an ID3v2 genre number/keyword to its full name
cannam@85:  */
cannam@85: id3_ucs4_t const *id3_genre_name(id3_ucs4_t const *string)
cannam@85: {
cannam@85:   id3_ucs4_t const *ptr;
cannam@85:   static id3_ucs4_t const genre_remix[] = { 'R', 'e', 'm', 'i', 'x', 0 };
cannam@85:   static id3_ucs4_t const genre_cover[] = { 'C', 'o', 'v', 'e', 'r', 0 };
cannam@85:   unsigned long number;
cannam@85: 
cannam@85:   if (string == 0 || *string == 0)
cannam@85:     return id3_ucs4_empty;
cannam@85: 
cannam@85:   if (string[0] == 'R' && string[1] == 'X' && string[2] == 0)
cannam@85:     return genre_remix;
cannam@85:   if (string[0] == 'C' && string[1] == 'R' && string[2] == 0)
cannam@85:     return genre_cover;
cannam@85: 
cannam@85:   for (ptr = string; *ptr; ++ptr) {
cannam@85:     if (*ptr < '0' || *ptr > '9')
cannam@85:       return string;
cannam@85:   }
cannam@85: 
cannam@85:   number = id3_ucs4_getnumber(string);
cannam@85: 
cannam@85:   return (number < NGENRES) ? genre_table[number] : string;
cannam@85: }
cannam@85: 
cannam@85: /*
cannam@85:  * NAME:	translate()
cannam@85:  * DESCRIPTION:	return a canonicalized character for testing genre equivalence
cannam@85:  */
cannam@85: static
cannam@85: id3_ucs4_t translate(id3_ucs4_t ch)
cannam@85: {
cannam@85:   if (ch) {
cannam@85:     if (ch >= 'A' && ch <= 'Z')
cannam@85:       ch += 'a' - 'A';
cannam@85: 
cannam@85:     if (ch < 'a' || ch > 'z')
cannam@85:       ch = ID3_UCS4_REPLACEMENTCHAR;
cannam@85:   }
cannam@85: 
cannam@85:   return ch;
cannam@85: }
cannam@85: 
cannam@85: /*
cannam@85:  * NAME:	compare()
cannam@85:  * DESCRIPTION:	test two ucs4 genre strings for equivalence
cannam@85:  */
cannam@85: static
cannam@85: int compare(id3_ucs4_t const *str1, id3_ucs4_t const *str2)
cannam@85: {
cannam@85:   id3_ucs4_t c1, c2;
cannam@85: 
cannam@85:   if (str1 == str2)
cannam@85:     return 1;
cannam@85: 
cannam@85:   do {
cannam@85:     do
cannam@85:       c1 = translate(*str1++);
cannam@85:     while (c1 == ID3_UCS4_REPLACEMENTCHAR);
cannam@85: 
cannam@85:     do
cannam@85:       c2 = translate(*str2++);
cannam@85:     while (c2 == ID3_UCS4_REPLACEMENTCHAR);
cannam@85:   }
cannam@85:   while (c1 && c1 == c2);
cannam@85: 
cannam@85:   return c1 == c2;
cannam@85: }
cannam@85: 
cannam@85: /*
cannam@85:  * NAME:	genre->number()
cannam@85:  * DESCRIPTION:	translate an ID3v2 genre name/number to its ID3v1 index number
cannam@85:  */
cannam@85: int id3_genre_number(id3_ucs4_t const *string)
cannam@85: {
cannam@85:   id3_ucs4_t const *ptr;
cannam@85:   int i;
cannam@85: 
cannam@85:   if (string == 0 || *string == 0)
cannam@85:     return -1;
cannam@85: 
cannam@85:   for (ptr = string; *ptr; ++ptr) {
cannam@85:     if (*ptr < '0' || *ptr > '9')
cannam@85:       break;
cannam@85:   }
cannam@85: 
cannam@85:   if (*ptr == 0) {
cannam@85:     unsigned long number;
cannam@85: 
cannam@85:     number = id3_ucs4_getnumber(string);
cannam@85: 
cannam@85:     return (number <= 0xff) ? number : -1;
cannam@85:   }
cannam@85: 
cannam@85:   for (i = 0; i < NGENRES; ++i) {
cannam@85:     if (compare(string, genre_table[i]))
cannam@85:       return i;
cannam@85:   }
cannam@85: 
cannam@85:   /* no equivalent */
cannam@85: 
cannam@85:   return -1;
cannam@85: }