3 files changed, 42 insertions, 5 deletions
diff --git a/indra/llcommon/llstring.cpp b/indra/llcommon/llstring.cpp
index 0c32679744..22c8681983 100755
--- a/indra/llcommon/llstring.cpp
+++ b/indra/llcommon/llstring.cpp
@@ -52,6 +52,23 @@ std::string ll_safe_string(const char* in, S32 maxlen)
 	return std::string();
 }
 
+bool is_char_hex(char hex)
+{
+	if((hex >= '0') && (hex <= '9'))
+	{
+		return true;
+	}
+	else if((hex >= 'a') && (hex <='f'))
+	{
+		return true;
+	}
+	else if((hex >= 'A') && (hex <='F'))
+	{
+		return true;
+	}
+	return false; // uh - oh, not hex any more...
+}
+
 U8 hex_as_nybble(char hex)
 {
 	if((hex >= '0') && (hex <= '9'))
diff --git a/indra/llcommon/llstring.h b/indra/llcommon/llstring.h
index 119efc7957..f9702868c8 100755
--- a/indra/llcommon/llstring.h
+++ b/indra/llcommon/llstring.h
@@ -470,6 +470,7 @@ inline std::string chop_tail_copy(
  * @brief This translates a nybble stored as a hex value from 0-f back
  * to a nybble in the low order bits of the return byte.
  */
+LL_COMMON_API bool is_char_hex(char hex);
 LL_COMMON_API U8 hex_as_nybble(char hex);
 
 /**
diff --git a/indra/llcommon/lluri.cpp b/indra/llcommon/lluri.cpp
index 21456a599b..37f5b3d6a3 100755
--- a/indra/llcommon/lluri.cpp
+++ b/indra/llcommon/lluri.cpp
@@ -129,11 +129,30 @@ std::string LLURI::unescape(const std::string& str)
 		{
 			++it;
 			if(it == end) break;
-			U8 c = hex_as_nybble(*it++);
-			c = c << 4;
-			if (it == end) break;
-			c |= hex_as_nybble(*it);
-			ostr.put((char)c);
+
+			if(is_char_hex(*it))
+			{
+				U8 c = hex_as_nybble(*it++);
+
+				c = c << 4;
+				if (it == end) break;
+
+				if(is_char_hex(*it))
+				{
+					c |= hex_as_nybble(*it);
+					ostr.put((char)c);
+				}
+				else
+				{
+					ostr.put((char)c);
+					ostr.put(*it);
+				}
+			}
+			else
+			{
+				ostr.put('%');
+				ostr.put(*it);
+			}
 		}
 		else
 		{