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 12-Nov-2002 19:00:03 using IntelliJ IDEA.
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16 | */
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17 | package com.drew.metadata.iptc;
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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.Directory;
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22 | import com.drew.metadata.Metadata;
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23 | import com.drew.metadata.MetadataException;
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24 | import com.drew.metadata.MetadataReader;
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25 |
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26 | import java.io.File;
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27 | import java.io.InputStream;
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28 | import java.util.Date;
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29 |
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30 | /**
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31 | *
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32 | */
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33 | public class IptcReader implements MetadataReader
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34 | {
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35 | /*
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36 | public static final int DIRECTORY_IPTC = 2;
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37 |
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38 | public static final int ENVELOPE_RECORD = 1;
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39 | public static final int APPLICATION_RECORD_2 = 2;
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40 | public static final int APPLICATION_RECORD_3 = 3;
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41 | public static final int APPLICATION_RECORD_4 = 4;
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42 | public static final int APPLICATION_RECORD_5 = 5;
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43 | public static final int APPLICATION_RECORD_6 = 6;
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44 | public static final int PRE_DATA_RECORD = 7;
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45 | public static final int DATA_RECORD = 8;
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46 | public static final int POST_DATA_RECORD = 9;
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47 | */
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48 | /**
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49 | * The Iptc data segment.
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50 | */
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51 | private final byte[] _data;
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52 |
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53 | /**
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54 | * Creates a new IptcReader for the specified Jpeg jpegFile.
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55 | */
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56 | public IptcReader(File jpegFile) throws JpegProcessingException
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57 | {
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58 | this(new JpegSegmentReader(jpegFile).readSegment(JpegSegmentReader.SEGMENT_APPD));
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59 | }
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60 |
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61 | /** Creates an IptcReader for a JPEG stream.
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62 | *
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63 | * @param is JPEG stream. Stream will be closed.
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64 | */
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65 | public IptcReader(InputStream is) throws JpegProcessingException
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66 | {
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67 | this(new JpegSegmentReader(is).readSegment(JpegSegmentReader.SEGMENT_APPD));
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68 | }
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69 |
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70 | public IptcReader(byte[] data)
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71 | {
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72 | _data = data;
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73 | }
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74 |
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75 | /**
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76 | * Performs the Exif data extraction, returning a new instance of <code>Metadata</code>.
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77 | */
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78 | public Metadata extract()
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79 | {
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80 | return extract(new Metadata());
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81 | }
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82 |
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83 | /**
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84 | * Performs the Exif data extraction, adding found values to the specified
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85 | * instance of <code>Metadata</code>.
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86 | */
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87 | public Metadata extract(Metadata metadata)
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88 | {
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89 | if (_data == null) {
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90 | return metadata;
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91 | }
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92 |
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93 | Directory directory = metadata.getDirectory(IptcDirectory.class);
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94 |
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95 | // find start of data
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96 | int offset = 0;
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97 | try {
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98 | while (offset < _data.length - 1 && get32Bits(offset) != 0x1c02) {
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99 | offset++;
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100 | }
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101 | } catch (MetadataException e) {
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102 | directory.addError("Couldn't find start of Iptc data (invalid segment)");
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103 | return metadata;
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104 | }
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105 |
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106 | // for each tag
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107 | while (offset < _data.length) {
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108 | // identifies start of a tag
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109 | if (_data[offset] != 0x1c) {
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110 | break;
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111 | }
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112 | // we need at least five bytes left to read a tag
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113 | if ((offset + 5) >= _data.length) {
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114 | break;
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115 | }
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116 |
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117 | offset++;
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118 |
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119 | int directoryType;
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120 | int tagType;
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121 | int tagByteCount;
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122 | try {
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123 | directoryType = _data[offset++];
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124 | tagType = _data[offset++];
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125 | tagByteCount = get32Bits(offset);
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126 | } catch (MetadataException e) {
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127 | directory.addError("Iptc data segment ended mid-way through tag descriptor");
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128 | return metadata;
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129 | }
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130 | offset += 2;
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131 | if ((offset + tagByteCount) > _data.length) {
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132 | directory.addError("data for tag extends beyond end of iptc segment");
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133 | break;
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134 | }
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135 |
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136 | processTag(directory, directoryType, tagType, offset, tagByteCount);
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137 | offset += tagByteCount;
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138 | }
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139 |
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140 | return metadata;
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141 | }
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142 |
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143 | /**
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144 | * Returns an int calculated from two bytes of data at the specified offset (MSB, LSB).
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145 | * @param offset position within the data buffer to read first byte
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146 | * @return the 32 bit int value, between 0x0000 and 0xFFFF
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147 | */
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148 | private int get32Bits(int offset) throws MetadataException
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149 | {
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150 | if (offset >= _data.length) {
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151 | throw new MetadataException("Attempt to read bytes from outside Iptc data buffer");
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152 | }
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153 | return ((_data[offset] & 255) << 8) | (_data[offset + 1] & 255);
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154 | }
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155 |
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156 | /**
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157 | * This method serves as marsheller of objects for dataset. It converts from IPTC
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158 | * octets to relevant java object.
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159 | */
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160 | private void processTag(Directory directory, int directoryType, int tagType, int offset, int tagByteCount)
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161 | {
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162 | int tagIdentifier = tagType | (directoryType << 8);
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163 |
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164 | switch (tagIdentifier) {
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165 | case IptcDirectory.TAG_RECORD_VERSION:
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166 | // short
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167 | short shortValue = (short)((_data[offset] << 8) | _data[offset + 1]);
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168 | directory.setInt(tagIdentifier, shortValue);
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169 | return;
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170 | case IptcDirectory.TAG_URGENCY:
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171 | // byte
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172 | directory.setInt(tagIdentifier, _data[offset]);
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173 | return;
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174 | case IptcDirectory.TAG_RELEASE_DATE:
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175 | case IptcDirectory.TAG_DATE_CREATED:
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176 | // Date object
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177 | if (tagByteCount >= 8) {
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178 | String dateStr = new String(_data, offset, tagByteCount);
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179 | try {
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180 | int year = Integer.parseInt(dateStr.substring(0, 4));
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181 | int month = Integer.parseInt(dateStr.substring(4, 6)) - 1;
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182 | int day = Integer.parseInt(dateStr.substring(6, 8));
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183 | Date date = (new java.util.GregorianCalendar(year, month, day)).getTime();
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184 | directory.setDate(tagIdentifier, date);
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185 | return;
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186 | } catch (NumberFormatException e) {
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187 | // fall through and we'll store whatever was there as a String
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188 | }
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189 | }
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190 | case IptcDirectory.TAG_RELEASE_TIME:
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191 | case IptcDirectory.TAG_TIME_CREATED:
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192 | // time...
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193 | default:
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194 | // fall through
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195 | }
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196 | // If no special handling by now, treat it as a string
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197 | String str;
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198 | if (tagByteCount < 1) {
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199 | str = "";
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200 | } else {
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201 | str = new String(_data, offset, tagByteCount);
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202 | }
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203 | if (directory.containsTag(tagIdentifier)) {
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204 | String[] oldStrings;
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205 | String[] newStrings;
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206 | try {
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207 | oldStrings = directory.getStringArray(tagIdentifier);
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208 | } catch (MetadataException e) {
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209 | oldStrings = null;
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210 | }
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211 | if (oldStrings == null) {
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212 | newStrings = new String[1];
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213 | } else {
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214 | newStrings = new String[oldStrings.length + 1];
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215 | for (int i = 0; i < oldStrings.length; i++) {
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216 | newStrings[i] = oldStrings[i];
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217 | }
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218 | }
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219 | newStrings[newStrings.length - 1] = str;
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220 | directory.setStringArray(tagIdentifier, newStrings);
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221 | } else {
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222 | directory.setString(tagIdentifier, str);
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223 | }
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224 | }
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225 | }
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