1 files changed, 23 insertions, 0 deletions
diff --git a/src/main/java/eu/siacs/conversations/utils/FileUtils.java b/src/main/java/eu/siacs/conversations/utils/FileUtils.java
index c5d0c3b0..727891ae 100644
--- a/src/main/java/eu/siacs/conversations/utils/FileUtils.java
+++ b/src/main/java/eu/siacs/conversations/utils/FileUtils.java
@@ -147,4 +147,27 @@ public class FileUtils {
 	public static boolean isMediaDocument(Uri uri) {
 		return "com.android.providers.media.documents".equals(uri.getAuthority());
 	}
+
+	/**
+	 * @param filename The filename to extract extension from
+	 * @return last extension or empty string
+	 */
+	public static String getLastExtension(final String filename) {
+		final int lastDotPosition = filename.lastIndexOf('.');
+		final String lastPart = lastDotPosition != -1 ?
+				filename.substring(lastDotPosition + 1) : "";
+		return lastPart;
+	}
+
+	/**
+	 * @param filename The filename to extract extension from
+	 * @return second to last extension or empty string
+	 */
+	public static String getSecondToLastExtension(final String filename) {
+		final int lastDotPosition = filename.lastIndexOf('.');
+		final int secondToLastDotPosition = filename.lastIndexOf('.', lastDotPosition - 1);
+		final String secondToLastPart = secondToLastDotPosition != -1 ?
+				filename.substring(secondToLastDotPosition + 1, lastDotPosition - 1) : "";
+		return secondToLastPart;
+	}
 }