Trailing query suffixes using the ? character are now stripped off th…

…e IIIF quality/format string.

Fixes: #145

ChangeLog

@@ -1,3 +1,8 @@
+27/06/2020:
+	- Trailing query suffixes using the ? character are now stripped off the IIIF quality/format string.
+	  Fixes: https://github.com/ruven/iipsrv/issues/145
+
+
 26/06/2020:
 	- JPEG encoding re-written. Now more efficient with compressed data put directly into
 	  output memory with no intermediate buffering and superfluous memory-memory copying.

src/IIIF.cc

@@ -531,7 +531,13 @@ void IIIF::run( Session* session, const string& src )
       string quality = izer.nextToken();
       transform( quality.begin(), quality.end(), quality.begin(), ::tolower );
 
-      size_t pos = quality.find_last_of(".");
+      // Strip off any query suffixes that use the ? character
+      // For example versioning such as ../default.jpg?t=23421232
+      size_t pos = quality.find_first_of("?");
+      if ( pos != string::npos ) quality = quality.substr( 0, pos );
+
+      // Check for a format specifier
+      pos = quality.find_last_of(".");
 
       // Format - if dot is not present, we use default and currently only supported format - JPEG
       if ( pos != string::npos ){