/*
* 21.04.2004 Original verion. davagin@udm.ru.
*-----------------------------------------------------------------------
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*----------------------------------------------------------------------
*/
package davaguine.jmac.info;
import davaguine.jmac.tools.ByteArrayWriter;
import davaguine.jmac.tools.JMACException;
import java.io.UnsupportedEncodingException;
/**
* Author: Dmitry Vaguine
* Date: 04.03.2004
* Time: 14:51:31
*/
public class APETagField {
public final static int TAG_FIELD_FLAG_READ_ONLY = (1 << 0);
public final static int TAG_FIELD_FLAG_DATA_TYPE_MASK = (6);
public final static int TAG_FIELD_FLAG_DATA_TYPE_TEXT_UTF8 = (0 << 1);
public final static int TAG_FIELD_FLAG_DATA_TYPE_BINARY = (1 << 1);
public final static int TAG_FIELD_FLAG_DATA_TYPE_EXTERNAL_INFO = (2 << 1);
public final static int TAG_FIELD_FLAG_DATA_TYPE_RESERVED = (3 << 1);
// create a tag field (use nFieldBytes = -1 for null-terminated strings)
public APETagField(String pFieldName, byte[] pFieldValue) {
this(pFieldName, pFieldValue, 0);
}
public APETagField(String pFieldName, byte[] pFieldValue, int nFlags) {
m_spFieldName = pFieldName;
m_spFieldValue = pFieldValue;
m_nFieldFlags = nFlags;
// data (we'll always allocate two extra bytes and memset to 0 so we're safely NULL terminated)
m_spFieldValue = new byte[pFieldValue.length];
System.arraycopy(pFieldValue, 0, m_spFieldValue, 0, pFieldValue.length);
// flags
m_nFieldFlags = nFlags;
}
public int GetFieldSize() {
try {
return m_spFieldName.getBytes("US-ASCII").length + 1 + m_spFieldValue.length + 4 + 4;
} catch (UnsupportedEncodingException e) {
throw new JMACException("Unsupported Encoding", e);
}
}
// get the name of the field
public String GetFieldName() {
return m_spFieldName;
}
// get the value of the field
public byte[] GetFieldValue() {
return m_spFieldValue;
}
public int GetFieldValueSize() {
return m_spFieldValue.length;
}
// get any special flags
public int GetFieldFlags() {
return m_nFieldFlags;
}
// output the entire field to a buffer (GetFieldSize() bytes)
public int SaveField(ByteArrayWriter writer) {
writer.writeInt(m_spFieldValue.length);
writer.writeInt(m_nFieldFlags);
writer.writeZString(m_spFieldName, "US-ASCII");
writer.writeBytes(m_spFieldValue);
return GetFieldSize();
}
// checks to see if the field is read-only
public boolean GetIsReadOnly() {
return (m_nFieldFlags & TAG_FIELD_FLAG_READ_ONLY) > 0;
}
public boolean GetIsUTF8Text() {
return ((m_nFieldFlags & TAG_FIELD_FLAG_DATA_TYPE_MASK) == TAG_FIELD_FLAG_DATA_TYPE_TEXT_UTF8);
}
// set helpers (use with EXTREME caution)
void SetFieldFlags(int nFlags) {
m_nFieldFlags = nFlags;
}
private String m_spFieldName;
private byte[] m_spFieldValue;
private int m_nFieldFlags;
}