1 | /*
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2 | * This is public domain software - that is, you can do whatever you want
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3 | * with it, and include it software that is licensed under the GNU or the
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4 | * BSD license, or whatever other licence you choose, including proprietary
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5 | * closed source licenses. I do ask that you leave this header in tact.
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6 | *
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7 | * If you make modifications to this code that you think would benefit the
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8 | * wider community, please send me a copy and I'll post it on my site.
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9 | *
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10 | * If you make use of this code, I'd appreciate hearing about it.
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11 | * drew@drewnoakes.com
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12 | * Latest version of this software kept at
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13 | * http://drewnoakes.com/
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14 | *
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15 | * Created by dnoakes on Oct 10, 2003 using IntelliJ IDEA.
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16 | */
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17 | package com.drew.metadata.jpeg;
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18 |
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19 | import com.drew.imaging.jpeg.JpegProcessingException;
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20 | import com.drew.imaging.jpeg.JpegSegmentReader;
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21 | import com.drew.metadata.Metadata;
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22 | import com.drew.metadata.MetadataReader;
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23 |
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24 | import java.io.File;
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25 | import java.io.InputStream;
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26 |
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27 | /**
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28 | *
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29 | * @author Drew Noakes http://drewnoakes.com
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30 | */
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31 | public class JpegCommentReader implements MetadataReader
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32 | {
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33 | /**
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34 | * The COM data segment.
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35 | */
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36 | private final byte[] _data;
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37 |
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38 | /**
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39 | * Creates a new JpegReader for the specified Jpeg jpegFile.
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40 | */
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41 | public JpegCommentReader(File jpegFile) throws JpegProcessingException
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42 | {
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43 | this(new JpegSegmentReader(jpegFile).readSegment(JpegSegmentReader.SEGMENT_COM));
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44 | }
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45 |
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46 | /** Creates a JpegCommentReader for a JPEG stream.
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47 | *
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48 | * @param is JPEG stream. Stream will be closed.
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49 | */
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50 | public JpegCommentReader(InputStream is) throws JpegProcessingException
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51 | {
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52 | this(new JpegSegmentReader(is).readSegment(JpegSegmentReader.SEGMENT_APPD));
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53 | }
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54 |
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55 | public JpegCommentReader(byte[] data)
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56 | {
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57 | _data = data;
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58 | }
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59 |
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60 | /**
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61 | * Performs the Jpeg data extraction, returning a new instance of <code>Metadata</code>.
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62 | */
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63 | public Metadata extract()
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64 | {
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65 | return extract(new Metadata());
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66 | }
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67 |
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68 | /**
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69 | * Performs the Jpeg data extraction, adding found values to the specified
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70 | * instance of <code>Metadata</code>.
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71 | */
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72 | public Metadata extract(Metadata metadata)
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73 | {
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74 | if (_data==null) {
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75 | return metadata;
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76 | }
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77 |
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78 | JpegCommentDirectory directory = (JpegCommentDirectory)metadata.getDirectory(JpegCommentDirectory.class);
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79 |
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80 | directory.setString(JpegCommentDirectory.TAG_JPEG_COMMENT, new String(_data));
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81 |
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82 | return metadata;
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83 | }
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84 | }
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