comparison src/libid3tag-0.15.1b/genre.c @ 0:c7265573341e

Import initial set of sources

+/*
+ * 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;
+}