X-Git-Url: https://gitweb.fperrin.net/?a=blobdiff_plain;f=tim%2Fprune%2Fjpeg%2FExifGateway.java;h=c11ba2e69ec7c3f1d7ead5bd7a549ec3ea6ce318;hb=8c8868ae29b3252f02e094c02307384cf61ba667;hp=c60afb299822c623f7a4abe77a78e485e50bdc00;hpb=140e9d165f85c3d4f0435a311e091209313faa2a;p=GpsPrune.git

diff --git a/tim/prune/jpeg/ExifGateway.java b/tim/prune/jpeg/ExifGateway.java
index c60afb2..c11ba2e 100644
--- a/tim/prune/jpeg/ExifGateway.java
+++ b/tim/prune/jpeg/ExifGateway.java
@@ -1,9 +1,7 @@
 package tim.prune.jpeg;
 
 import java.io.File;
-
 import javax.swing.JOptionPane;
-
 import tim.prune.I18nManager;
 
 /**
@@ -12,10 +10,8 @@ import tim.prune.I18nManager;
  * to the external libmetadata-extractor-java library
  * instead of the included modified routines.
  *
- * To use the internal routines, set the USE_INTERNAL_LIBRARY flag to true
- * and include the internal classes in the compiled jar.
- * To use the external library, set the USE_INTERNAL_LIBRARY flag to false
- * and do not export the internal classes.
+ * Switching between internal and external libraries is
+ * handled by the ExifLibrarySwitch
  */
 public abstract class ExifGateway
 {
@@ -51,7 +47,10 @@ public abstract class ExifGateway
 				return data;
 			}
 		}
-		catch (LinkageError nolib) {}
+		catch (LinkageError nolib) {
+			System.err.println("Link: " + nolib.getMessage());
+			nolib.printStackTrace();
+		}
 		// Not successful - warn if necessary
 		if (!_exifFailWarned)
 		{
@@ -71,4 +70,39 @@ public abstract class ExifGateway
 		if (_exifLibrary == null || !_exifLibrary.looksOK()) {key = key + ".failed";}
 		return key;
 	}
+
+
+	/**
+	 * @param inNumerator numerator from Rational
+	 * @param inDenominator denominator from Rational
+	 * @return the value of the specified number as a positive <code>double</code>.
+	 * Prevents interpretation of 32 bit numbers as negative, and forces a positive answer
+	 */
+	public static final double convertToPositiveValue(int inNumerator, int inDenominator)
+	{
+		if (inDenominator == 0) return 0.0;
+		double numeratorDbl = inNumerator;
+		double denomDbl = inDenominator;
+		if (inNumerator >= 0)
+			return numeratorDbl / denomDbl;
+		final double correction = Math.pow(2.0, 32);
+		numeratorDbl += correction;
+		if (inDenominator < 0) denomDbl += correction;
+		return numeratorDbl / denomDbl;
+	}
+
+
+	/**
+	 * @param inNumerator numerator from Rational
+	 * @param inDenominator denominator from Rational
+	 * @return the value of the specified number as a positive <code>double</code>.
+	 * Forces a positive answer
+	 */
+	public static final double convertToPositiveValue(long inNumerator, long inDenominator)
+	{
+		if (inDenominator == 0L) return 0.0;
+		final double numeratorDbl = inNumerator;
+		final double denomDbl = inDenominator;
+		return numeratorDbl / denomDbl;
+	}
 }