package com.frostwire.mp3;
import java.util.Arrays;
public class ID3v1Tag implements ID3v1 {
public static final int TAG_LENGTH = 128;
private static final String VERSION_0 = "0";
private static final String VERSION_1 = "1";
private static final String TAG = "TAG";
private static final int TITLE_OFFSET = 3;
private static final int TITLE_LENGTH = 30;
private static final int ARTIST_OFFSET = 33;
private static final int ARTIST_LENGTH = 30;
private static final int ALBUM_OFFSET = 63;
private static final int ALBUM_LENGTH = 30;
private static final int YEAR_OFFSET = 93;
private static final int YEAR_LENGTH = 4;
private static final int COMMENT_OFFSET = 97;
private static final int COMMENT_LENGTH_V1_0 = 30;
private static final int COMMENT_LENGTH_V1_1 = 28;
private static final int TRACK_MARKER_OFFSET = 125;
private static final int TRACK_OFFSET = 126;
private static final int GENRE_OFFSET = 127;
private String track = null;
private String artist = null;
private String title = null;
private String album = null;
private String year = null;
private int genre = -1;
private String comment = null;
public ID3v1Tag() {
}
public ID3v1Tag(byte[] bytes) throws NoSuchTagException {
unpackTag(bytes);
}
private void unpackTag(byte[] bytes) throws NoSuchTagException {
sanityCheckTag(bytes);
title = BufferTools.trimStringRight(BufferTools.byteBufferToString(bytes, TITLE_OFFSET, TITLE_LENGTH));
artist = BufferTools.trimStringRight(BufferTools.byteBufferToString(bytes, ARTIST_OFFSET, ARTIST_LENGTH));
album = BufferTools.trimStringRight(BufferTools.byteBufferToString(bytes, ALBUM_OFFSET, ALBUM_LENGTH));
year = BufferTools.trimStringRight(BufferTools.byteBufferToString(bytes, YEAR_OFFSET, YEAR_LENGTH));
genre = bytes[GENRE_OFFSET] & 0xFF;
if (genre == 0xFF) {
genre = -1;
}
if (bytes[TRACK_MARKER_OFFSET] != 0) {
comment = BufferTools.trimStringRight(BufferTools.byteBufferToString(bytes, COMMENT_OFFSET, COMMENT_LENGTH_V1_0));
track = null;
} else {
comment = BufferTools.trimStringRight(BufferTools.byteBufferToString(bytes, COMMENT_OFFSET, COMMENT_LENGTH_V1_1));
int trackInt = bytes[TRACK_OFFSET];
if (trackInt == 0) {
track = "";
} else {
track = Integer.toString(trackInt);
}
}
}
private void sanityCheckTag(byte[] bytes) throws NoSuchTagException {
if (bytes.length != TAG_LENGTH) {
throw new NoSuchTagException("Buffer length wrong");
}
if (! TAG.equals(BufferTools.byteBufferToString(bytes, 0, TAG.length()))) {
throw new NoSuchTagException();
}
}
public byte[] toBytes() {
byte[] bytes = new byte[TAG_LENGTH];
packTag(bytes);
return bytes;
}
public void toBytes(byte[] bytes) {
packTag(bytes);
}
public void packTag(byte[] bytes) {
Arrays.fill(bytes, (byte)0);
BufferTools.stringIntoByteBuffer(TAG, 0, 3, bytes, 0);
packField(bytes, title, TITLE_LENGTH, TITLE_OFFSET);
packField(bytes, artist, ARTIST_LENGTH, ARTIST_OFFSET);
packField(bytes, album, ALBUM_LENGTH, ALBUM_OFFSET);
packField(bytes, year, YEAR_LENGTH, YEAR_OFFSET);
if (genre < 128) {
bytes[GENRE_OFFSET] = (byte)genre;
} else {
bytes[GENRE_OFFSET] = (byte)(genre - 256);
}
if (track == null) {
packField(bytes, comment, COMMENT_LENGTH_V1_0, COMMENT_OFFSET);
} else {
packField(bytes, comment, COMMENT_LENGTH_V1_1, COMMENT_OFFSET);
String trackTemp = numericsOnly(track);
if (trackTemp.length() > 0) {
int trackInt = Integer.parseInt(trackTemp.toString());
if (trackInt < 128) {
bytes[TRACK_OFFSET] = (byte)trackInt;
} else {
bytes[TRACK_OFFSET] = (byte)(trackInt - 256);
}
}
}
}
private void packField(byte[] bytes, String value, int maxLength, int offset) {
if (value != null) {
BufferTools.stringIntoByteBuffer(value, 0, Math.min(value.length(), maxLength), bytes, offset);
}
}
private String numericsOnly(String s) {
StringBuffer stringBuffer = new StringBuffer();
for (int i = 0; i < s.length(); i++) {
char ch = s.charAt(i);
if (ch >= '0' && ch <= '9') {
stringBuffer.append(ch);
} else {
break;
}
}
return stringBuffer.toString();
}
public String getVersion() {
if (track == null) {
return VERSION_0;
} else {
return VERSION_1;
}
}
public String getTrack() {
return track;
}
public void setTrack(String track) {
this.track = track;
}
public String getArtist() {
return artist;
}
public void setArtist(String artist) {
this.artist = artist;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getAlbum() {
return album;
}
public void setAlbum(String album) {
this.album = album;
}
public String getYear() {
return year;
}
public void setYear(String year) {
this.year = year;
}
public int getGenre() {
return genre;
}
public void setGenre(int genre) {
this.genre = genre;
}
public String getGenreDescription() {
try {
return ID3v1Genres.GENRES[genre];
} catch (ArrayIndexOutOfBoundsException e) {
return "Unknown";
}
}
public String getComment() {
return comment;
}
public void setComment(String comment) {
this.comment = comment;
}
public boolean equals(Object obj) {
if (! (obj instanceof ID3v1Tag)) return false;
if (super.equals(obj)) return true;
ID3v1Tag other = (ID3v1Tag) obj;
if (genre != other.genre) return false;
if (track == null) {
if (other.track != null) return false;
} else if (other.track == null) return false;
else if (! track.equals(other.track)) return false;
if (artist == null) {
if (other.artist != null) return false;
} else if (other.artist == null) return false;
else if (! artist.equals(other.artist)) return false;
if (title == null) {
if (other.title != null) return false;
} else if (other.title == null) return false;
else if (! title.equals(other.title)) return false;
if (album == null) {
if (other.album != null) return false;
} else if (other.album == null) return false;
else if (! album.equals(other.album)) return false;
if (year == null) {
if (other.year != null) return false;
} else if (other.year == null) return false;
else if (! year.equals(other.year)) return false;
if (comment == null) {
if (other.comment != null) return false;
} else if (other.comment == null) return false;
else if (! comment.equals(other.comment)) return false;
return true;
}
}