Always enable URI filenames when compiling with SQLITE_HAS_CODEC.  Also allow
plaintext keys using the key= query parameter.

FossilOrigin-Name: 31a51b4d168065fa59cc0e52ba798bd87ac82160c675bd531442b65133edb401
diff --git a/src/main.c b/src/main.c
index 4ac5327..32d0008 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3095,16 +3095,18 @@
 #endif
 #if defined(SQLITE_HAS_CODEC)
   if( rc==SQLITE_OK ){
-    const char *zHexKey = sqlite3_uri_parameter(zOpen, "hexkey");
-    if( zHexKey && zHexKey[0] ){
+    const char *zKey;
+    if( (zKey = sqlite3_uri_parameter(zOpen, "hexkey"))!=0 && zKey[0] ){;
       u8 iByte;
       int i;
-      char zKey[40];
-      for(i=0, iByte=0; i<sizeof(zKey)*2 && sqlite3Isxdigit(zHexKey[i]); i++){
-        iByte = (iByte<<4) + sqlite3HexToInt(zHexKey[i]);
-        if( (i&1)!=0 ) zKey[i/2] = iByte;
+      char zDecoded[40];
+      for(i=0, iByte=0; i<sizeof(zDecoded)*2 && sqlite3Isxdigit(zKey[i]); i++){
+        iByte = (iByte<<4) + sqlite3HexToInt(zKey[i]);
+        if( (i&1)!=0 ) zDecoded[i/2] = iByte;
       }
-      sqlite3_key_v2(db, 0, zKey, i/2);
+      sqlite3_key_v2(db, 0, zDecoded, i/2);
+    }else if( (zKey = sqlite3_uri_parameter(zOpen, "key"))!=0 ){
+      sqlite3_key_v2(db, 0, zKey, sqlite3Strlen30(zKey));
     }
   }
 #endif