| 1 | package org.farng.mp3.id3; |
| 2 | |
| 3 | import org.farng.mp3.InvalidTagException; |
| 4 | import org.farng.mp3.object.ObjectByteArraySizeTerminated; |
| 5 | import org.farng.mp3.object.ObjectStringNullTerminated; |
| 6 | |
| 7 | import java.io.IOException; |
| 8 | import java.io.RandomAccessFile; |
| 9 | |
| 10 | /** |
| 11 | * <h3>4.20. Encrypted meta frame</h3> |
| 12 | * <p/> |
| 13 | * <p class=t> This frame contains one or more encrypted frames. This enables protection of copyrighted information such |
| 14 | * as pictures and text, that people might want to pay extra for. Since standardisation of such an encryption scheme is |
| 15 | * beyond this document, all "CRM" frames begin with a terminated string with a <a href="#url">URL</a> containing an |
| 16 | * email address, or a link to a location where an email adress can be found, that belongs to the organisation |
| 17 | * responsible for this specific encrypted meta frame. </p> |
| 18 | * <p/> |
| 19 | * <p class=t> Questions regarding the encrypted frame should be sent to the indicated email address. If a $00 is found |
| 20 | * directly after the 'Frame size', the whole frame should be ignored, and preferably be removed. The 'Owner identifier' |
| 21 | * is then followed by a short content description and explanation as to why it's encrypted. After the |
| 22 | * 'content/explanation' description, the actual encrypted block follows. </p> |
| 23 | * <p/> |
| 24 | * <p class=t> |
| 25 | * <p/> |
| 26 | * When an ID3v2 decoder encounters a "CRM" frame, it should send the datablock to the 'plugin' with the corresponding |
| 27 | * 'owner identifier' and expect to receive either a datablock with one or several ID3v2 frames after each other or an |
| 28 | * error. There may be more than one "CRM" frames in a tag, but only one with the same 'owner identifier'. </p> |
| 29 | * <p/> |
| 30 | * <p><center> <table border=0> <tr><td nowrap>Encrypted meta frame</td><td rowspan=5> </td><td |
| 31 | * width="100%">"CRM"</td></tr> <tr><td>Frame size</td><td>$xx xx xx</td></tr> <tr><td>Owner |
| 32 | * identifier</td><td><textstring> $00 (00)</td></tr> |
| 33 | * <p/> |
| 34 | * <tr><td>Content/explanation</td><td><textstring> $00 (00)</td></tr> <tr><td>Encrypted |
| 35 | * datablock</td><td><binary data></td></tr> </table> </center> |
| 36 | * |
| 37 | * @author Eric Farng |
| 38 | * @version $Revision: 1.4 $ |
| 39 | */ |
| 40 | public class FrameBodyCRM extends AbstractID3v2FrameBody { |
| 41 | |
| 42 | /** |
| 43 | * Creates a new FrameBodyCRM object. |
| 44 | */ |
| 45 | public FrameBodyCRM() { |
| 46 | super(); |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Creates a new FrameBodyCRM object. |
| 51 | */ |
| 52 | public FrameBodyCRM(final FrameBodyCRM body) { |
| 53 | super(body); |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Creates a new FrameBodyCRM object. |
| 58 | */ |
| 59 | public FrameBodyCRM(final String owner, final String description, final byte[] data) { |
| 60 | setObject("Owner", owner); |
| 61 | setObject("Description", description); |
| 62 | setObject("Encrypted datablock", data); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Creates a new FrameBodyCRM object. |
| 67 | */ |
| 68 | public FrameBodyCRM(final RandomAccessFile file) throws IOException, InvalidTagException { |
| 69 | this.read(file); |
| 70 | } |
| 71 | |
| 72 | public String getIdentifier() { |
| 73 | return "CRM" + ((char) 0) + getOwner(); |
| 74 | } |
| 75 | |
| 76 | public String getOwner() { |
| 77 | return (String) getObject("Owner"); |
| 78 | } |
| 79 | |
| 80 | public void getOwner(final String description) { |
| 81 | setObject("Owner", description); |
| 82 | } |
| 83 | |
| 84 | protected void setupObjectList() { |
| 85 | appendToObjectList(new ObjectStringNullTerminated("Owner")); |
| 86 | appendToObjectList(new ObjectStringNullTerminated("Description")); |
| 87 | appendToObjectList(new ObjectByteArraySizeTerminated("Encrypted datablock")); |
| 88 | } |
| 89 | } |