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