1 | /*
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2 | * Copyright 2002-2012 Drew Noakes
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | * More information about this project is available at:
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17 | *
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18 | * http://drewnoakes.com/code/exif/
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19 | * http://code.google.com/p/metadata-extractor/
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20 | */
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21 | package com.drew.imaging.jpeg;
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22 |
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23 | import com.drew.lang.ByteArrayReader;
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24 | import com.drew.lang.annotations.NotNull;
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25 | import com.drew.metadata.Metadata;
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26 | import com.drew.metadata.exif.ExifReader;
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27 | import com.drew.metadata.iptc.IptcReader;
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28 | import com.drew.metadata.jpeg.JpegCommentReader;
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29 | import com.drew.metadata.jpeg.JpegDirectory;
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30 | import com.drew.metadata.jpeg.JpegReader;
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31 |
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32 | import java.io.File;
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33 | import java.io.IOException;
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34 | import java.io.InputStream;
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35 |
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36 | /**
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37 | * Obtains all available metadata from Jpeg formatted files.
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38 | *
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39 | * @author Drew Noakes http://drewnoakes.com
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40 | */
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41 | public class JpegMetadataReader
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42 | {
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43 | // TODO investigate supporting javax.imageio
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44 | // public static Metadata readMetadata(IIOMetadata metadata) throws JpegProcessingException {}
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45 | // public static Metadata readMetadata(ImageInputStream in) throws JpegProcessingException{}
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46 | // public static Metadata readMetadata(IIOImage image) throws JpegProcessingException{}
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47 | // public static Metadata readMetadata(ImageReader reader) throws JpegProcessingException{}
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48 |
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49 | @NotNull
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50 | public static Metadata readMetadata(@NotNull InputStream inputStream) throws JpegProcessingException
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51 | {
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52 | return readMetadata(inputStream, true);
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53 | }
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54 |
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55 | @NotNull
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56 | public static Metadata readMetadata(@NotNull InputStream inputStream, final boolean waitForBytes) throws JpegProcessingException
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57 | {
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58 | JpegSegmentReader segmentReader = new JpegSegmentReader(inputStream, waitForBytes);
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59 | return extractMetadataFromJpegSegmentReader(segmentReader.getSegmentData());
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60 | }
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61 |
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62 | @NotNull
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63 | public static Metadata readMetadata(@NotNull File file) throws JpegProcessingException, IOException
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64 | {
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65 | JpegSegmentReader segmentReader = new JpegSegmentReader(file);
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66 | return extractMetadataFromJpegSegmentReader(segmentReader.getSegmentData());
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67 | }
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68 |
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69 | @NotNull
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70 | public static Metadata extractMetadataFromJpegSegmentReader(@NotNull JpegSegmentData segmentReader)
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71 | {
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72 | final Metadata metadata = new Metadata();
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73 |
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74 | // Loop through looking for all SOFn segments. When we find one, we know what type of compression
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75 | // was used for the JPEG, and we can process the JPEG metadata in the segment too.
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76 | for (byte i = 0; i < 16; i++) {
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77 | // There are no SOF4 or SOF12 segments, so don't bother
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78 | if (i == 4 || i == 12)
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79 | continue;
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80 | // Should never have more than one SOFn for a given 'n'.
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81 | byte[] jpegSegment = segmentReader.getSegment((byte)(JpegSegmentReader.SEGMENT_SOF0 + i));
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82 | if (jpegSegment == null)
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83 | continue;
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84 | JpegDirectory directory = metadata.getOrCreateDirectory(JpegDirectory.class);
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85 | directory.setInt(JpegDirectory.TAG_JPEG_COMPRESSION_TYPE, i);
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86 | new JpegReader().extract(new ByteArrayReader(jpegSegment), metadata);
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87 | break;
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88 | }
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89 |
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90 | // There should never be more than one COM segment.
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91 | byte[] comSegment = segmentReader.getSegment(JpegSegmentReader.SEGMENT_COM);
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92 | if (comSegment != null)
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93 | new JpegCommentReader().extract(new ByteArrayReader(comSegment), metadata);
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94 |
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95 | // Loop through all APP1 segments, checking the leading bytes to identify the format of each.
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96 | for (byte[] app1Segment : segmentReader.getSegments(JpegSegmentReader.SEGMENT_APP1)) {
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97 | if (app1Segment.length > 3 && "EXIF".equalsIgnoreCase(new String(app1Segment, 0, 4)))
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98 | new ExifReader().extract(new ByteArrayReader(app1Segment), metadata);
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99 |
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100 | //if (app1Segment.length > 27 && "http://ns.adobe.com/xap/1.0/".equalsIgnoreCase(new String(app1Segment, 0, 28)))
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101 | // new XmpReader().extract(new ByteArrayReader(app1Segment), metadata);
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102 | }
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103 |
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104 | // Loop through all APPD segments, checking the leading bytes to identify the format of each.
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105 | for (byte[] appdSegment : segmentReader.getSegments(JpegSegmentReader.SEGMENT_APPD)) {
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106 | if (appdSegment.length > 12 && "Photoshop 3.0".compareTo(new String(appdSegment, 0, 13))==0) {
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107 | //new PhotoshopReader().extract(new ByteArrayReader(appdSegment), metadata);
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108 | } else {
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109 | // TODO might be able to check for a leading 0x1c02 for IPTC data...
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110 | new IptcReader().extract(new ByteArrayReader(appdSegment), metadata);
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111 | }
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112 | }
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113 |
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114 | return metadata;
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115 | }
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116 |
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117 | private JpegMetadataReader() throws Exception
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118 | {
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119 | throw new Exception("Not intended for instantiation");
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120 | }
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121 | }
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122 |
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