1/* 2 * libid3tag - ID3 tag manipulation library 3 * Copyright (C) 2000-2003 Underbit Technologies, Inc. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 * 19 * $Id: genre.c,v 1.7 2003/04/19 00:14:33 rob Exp $ 20 */ 21 22# ifdef HAVE_CONFIG_H 23# include "config.h" 24# endif 25 26# include "global.h" 27 28# include "id3tag.h" 29# include "ucs4.h" 30 31/* genres are stored in ucs4 format */ 32# include "genre.dat" 33 34# define NGENRES (sizeof(genre_table) / sizeof(genre_table[0])) 35 36/* 37 * NAME: genre->index() 38 * DESCRIPTION: return an ID3v1 genre string indexed by number 39 */ 40id3_ucs4_t const *id3_genre_index(unsigned int index) 41{ 42 return (index < NGENRES) ? genre_table[index] : 0; 43} 44 45/* 46 * NAME: genre->name() 47 * DESCRIPTION: translate an ID3v2 genre number/keyword to its full name 48 */ 49id3_ucs4_t const *id3_genre_name(id3_ucs4_t const *string) 50{ 51 id3_ucs4_t const *ptr; 52 static id3_ucs4_t const genre_remix[] = { 'R', 'e', 'm', 'i', 'x', 0 }; 53 static id3_ucs4_t const genre_cover[] = { 'C', 'o', 'v', 'e', 'r', 0 }; 54 unsigned long number; 55 56 if (string == 0 || *string == 0) 57 return id3_ucs4_empty; 58 59 if (string[0] == 'R' && string[1] == 'X' && string[2] == 0) 60 return genre_remix; 61 if (string[0] == 'C' && string[1] == 'R' && string[2] == 0) 62 return genre_cover; 63 64 for (ptr = string; *ptr; ++ptr) { 65 if (*ptr < '0' || *ptr > '9') 66 return string; 67 } 68 69 number = id3_ucs4_getnumber(string); 70 71 return (number < NGENRES) ? genre_table[number] : string; 72} 73 74/* 75 * NAME: translate() 76 * DESCRIPTION: return a canonicalized character for testing genre equivalence 77 */ 78static 79id3_ucs4_t translate(id3_ucs4_t ch) 80{ 81 if (ch) { 82 if (ch >= 'A' && ch <= 'Z') 83 ch += 'a' - 'A'; 84 85 if (ch < 'a' || ch > 'z') 86 ch = ID3_UCS4_REPLACEMENTCHAR; 87 } 88 89 return ch; 90} 91 92/* 93 * NAME: compare() 94 * DESCRIPTION: test two ucs4 genre strings for equivalence 95 */ 96static 97int compare(id3_ucs4_t const *str1, id3_ucs4_t const *str2) 98{ 99 id3_ucs4_t c1, c2; 100 101 if (str1 == str2) 102 return 1; 103 104 do { 105 do 106 c1 = translate(*str1++); 107 while (c1 == ID3_UCS4_REPLACEMENTCHAR); 108 109 do 110 c2 = translate(*str2++); 111 while (c2 == ID3_UCS4_REPLACEMENTCHAR); 112 } 113 while (c1 && c1 == c2); 114 115 return c1 == c2; 116} 117 118/* 119 * NAME: genre->number() 120 * DESCRIPTION: translate an ID3v2 genre name/number to its ID3v1 index number 121 */ 122int id3_genre_number(id3_ucs4_t const *string) 123{ 124 id3_ucs4_t const *ptr; 125 int i; 126 127 if (string == 0 || *string == 0) 128 return -1; 129 130 for (ptr = string; *ptr; ++ptr) { 131 if (*ptr < '0' || *ptr > '9') 132 break; 133 } 134 135 if (*ptr == 0) { 136 unsigned long number; 137 138 number = id3_ucs4_getnumber(string); 139 140 return (number <= 0xff) ? number : -1; 141 } 142 143 for (i = 0; i < NGENRES; ++i) { 144 if (compare(string, genre_table[i])) 145 return i; 146 } 147 148 /* no equivalent */ 149 150 return -1; 151} 152