X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=tim%2Fprune%2Fjpeg%2Fdrew%2FExifTiffHandler.java;fp=tim%2Fprune%2Fjpeg%2Fdrew%2FExifTiffHandler.java;h=a98e720328939c27dcc13666938333200247b602;hp=0000000000000000000000000000000000000000;hb=92dad5df664287acb51728e9ea599f150765d34a;hpb=81843c3d8d0771bf00d0f26034a13aa515465c78

diff --git a/tim/prune/jpeg/drew/ExifTiffHandler.java b/tim/prune/jpeg/drew/ExifTiffHandler.java
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+++ b/tim/prune/jpeg/drew/ExifTiffHandler.java
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+/*
+ * Copyright 2002-2015 Drew Noakes
+ *
+ * More information about this project is available at:
+ *
+ *    https://drewnoakes.com/code/exif/
+ *    https://github.com/drewnoakes/metadata-extractor
+ */
+package tim.prune.jpeg.drew;
+
+import tim.prune.jpeg.JpegData;
+
+/**
+ * Implementation of TiffHandler used for handling TIFF tags according to the Exif standard.
+ *
+ * @author Drew Noakes https://drewnoakes.com
+ */
+public class ExifTiffHandler
+{
+	private JpegData _jpegData = null;
+	private long _thumbnailOffset = -1L, _thumbnailLength = -1L;
+
+	/** This tag is a pointer to the Exif SubIFD. */
+	final int DIR_EXIF_SUB_IFD_OFFSET = 0x8769;
+	/** This tag is a pointer to the Exif GPS IFD. */
+	final int DIR_GPS_INFO_OFFSET = 0x8825;
+
+	private static final int TAG_GPS_LATITUDE_REF  = 0x0001;
+	private static final int TAG_GPS_LATITUDE      = 0x0002;
+	private static final int TAG_GPS_LONGITUDE_REF = 0x0003;
+	private static final int TAG_GPS_LONGITUDE     = 0x0004;
+	private static final int TAG_GPS_ALTITUDE      = 0x0006;
+	private static final int TAG_GPS_BEARING       = 0x0011;
+
+	private static final int TAG_ORIENTATION       = 0x0112;
+	private static final int TAG_THUMBNAIL_OFFSET  = 0x0201;
+	private static final int TAG_THUMBNAIL_LENGTH  = 0x0202;
+
+	private static final int TAG_SUB_ORITIME       = 0x9003;
+	private static final int TAG_SUB_DIGITIME      = 0x9004;
+
+
+	/**
+	 * Constructor
+	 * @param jpegData data object to populate with received results
+	 */
+	public ExifTiffHandler(JpegData jpegData)
+	{
+		_jpegData = jpegData;
+		_thumbnailOffset = _thumbnailLength = -1L;
+	}
+
+	public boolean isTagIfdPointer(int tagType)
+	{
+		if (tagType == DIR_EXIF_SUB_IFD_OFFSET) {
+			return true;
+		} else if (tagType == DIR_GPS_INFO_OFFSET) {
+			return true;
+		}
+
+		return false;
+	}
+
+	public void completed(final ByteArrayReader reader, final int tiffHeaderOffset)
+	{
+		// after the extraction process, if we have the correct tags, we may be able to store thumbnail information
+		if (_thumbnailOffset >= 0L && _thumbnailLength > 0L)
+		{
+			try {
+				byte[] thumbData = reader.getBytes(tiffHeaderOffset + (int) _thumbnailOffset, (int) _thumbnailLength);
+				if (thumbData != null)
+				{
+					byte[] thumbCopy = new byte[thumbData.length];
+					System.arraycopy(thumbData, 0, thumbCopy, 0, thumbData.length);
+					_jpegData.setThumbnailImage(thumbCopy);
+				}
+			} catch (ExifException ex) {}
+		}
+	}
+
+	public void setRationalArray(int tagId, Rational[] array)
+	{
+		switch (tagId)
+		{
+			case TAG_GPS_LATITUDE:
+				_jpegData.setLatitude(new double[] {array[0].doubleValue(), array[1].doubleValue(),
+					array[2].convertToPositiveValue()});
+				break;
+			case TAG_GPS_LONGITUDE:
+				_jpegData.setLongitude(new double[] {array[0].doubleValue(), array[1].doubleValue(),
+					array[2].convertToPositiveValue()});
+				break;
+		}
+	}
+
+	public void setRational(int tagId, Rational rational)
+	{
+		switch (tagId)
+		{
+			case TAG_GPS_ALTITUDE:
+				_jpegData.setAltitude(rational.intValue());
+				return;
+			case TAG_GPS_BEARING:
+				_jpegData.setBearing(rational.doubleValue());
+				return;
+		}
+		// maybe it was an integer passed as a rational?
+		if (rational.getDenominator() == 1L) {
+			setIntegerValue(tagId, rational.intValue());
+		}
+	}
+
+	public void setString(int tagId, String string)
+	{
+		switch (tagId)
+		{
+			case TAG_SUB_ORITIME:
+				_jpegData.setOriginalTimestamp(string);
+				break;
+			case TAG_SUB_DIGITIME:
+				_jpegData.setDigitizedTimestamp(string);
+				break;
+			case TAG_GPS_LATITUDE_REF:
+				_jpegData.setLatitudeRef(string);
+				break;
+			case TAG_GPS_LONGITUDE_REF:
+				_jpegData.setLongitudeRef(string);
+				break;
+		}
+	}
+
+	public void setIntegerValue(int tagId, int intVal)
+	{
+		switch (tagId)
+		{
+			case TAG_ORIENTATION:
+				_jpegData.setOrientationCode(intVal);
+				break;
+			case TAG_THUMBNAIL_OFFSET:
+				_thumbnailOffset = intVal;
+				break;
+			case TAG_THUMBNAIL_LENGTH:
+				_thumbnailLength = intVal;
+				break;
+		}
+	}
+
+
+	/**
+	 * Decide, based on the directory id and the tag id, if we want to parse and process it
+	 * @param inDirectoryId
+	 * @param childTagId
+	 * @return true if the tag should be parsed
+	 */
+	public boolean isInterestingTag(int inDirectoryId, int childTagId)
+	{
+		switch (inDirectoryId)
+		{
+			case DIR_GPS_INFO_OFFSET:
+				return true;
+			case DIR_EXIF_SUB_IFD_OFFSET:
+				return childTagId == TAG_SUB_ORITIME
+					|| childTagId == TAG_SUB_DIGITIME;
+			case 0:
+				return childTagId == TAG_THUMBNAIL_OFFSET
+					|| childTagId == TAG_THUMBNAIL_LENGTH
+					|| childTagId == TAG_ORIENTATION;
+		}
+		return false;
+	}
+}