From c44e320ae6df411403a50a4bddfcdfa0c27898f7 Mon Sep 17 00:00:00 2001
From: Gerhard Gossen <gossen@l3s.de>
Date: Mon, 15 Jun 2015 13:25:59 +0200
Subject: [PATCH] Handle empty String argument in CharsetDetector.trimAttrValue

---
 .../java/org/archive/format/text/charset/CharsetDetector.java  | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/java/org/archive/format/text/charset/CharsetDetector.java b/src/main/java/org/archive/format/text/charset/CharsetDetector.java
index d391aac3..ae71b5fa 100644
--- a/src/main/java/org/archive/format/text/charset/CharsetDetector.java
+++ b/src/main/java/org/archive/format/text/charset/CharsetDetector.java
@@ -178,6 +178,9 @@ protected String getCharsetFromMeta(byte buffer[],int len) throws IOException {
 	}
 
 	private static String trimAttrValue(String value) {
+		if (value.isEmpty()) {
+			return value;
+		}
 		String result = value;
 		if (result.charAt(0) == '"') {
 			result = result.substring(1, result.length() - 1);