# 2006 February 16

 #

 # The author disclaims copyright to this source code.  In place of

 # a legal notice, here is a blessing:

 #

 #    May you do good and not evil.

 #    May you find forgiveness for yourself and forgive others.

 #    May you share freely, never taking more than you give.

 #

 #***********************************************************************

 # 

 # This file contains code to verify that the SQLITE_UTF16_ALIGNED

 # flag passed into the sqlite3_create_collation() function insures

 # that all strings passed to that function are aligned on an even

 # byte boundary.

 #

 # $Id: utf16align.test,v 1.1 2006/02/16 18:16:38 drh Exp $

 set testdir [file dirname $argv0]

 source $testdir/tester.tcl

 # Skip this entire test if we do not support UTF16

 #

 ifcapable !utf16 {

   finish_test

   return

 }

 # Create a database with a UTF16 encoding.  Put in lots of string

 # data of varying lengths.

 #

 do_test utf16align-1.0 {

   set unaligned_string_counter 0

   add_alignment_test_collations [sqlite3_connection_pointer db]

   execsql {

     PRAGMA encoding=UTF16;

     CREATE TABLE t1(

       id INTEGER PRIMARY KEY,

       spacer TEXT,

       a TEXT COLLATE utf16_aligned,

       b TEXT COLLATE utf16_unaligned

     );

     INSERT INTO t1(a) VALUES("abc");

     INSERT INTO t1(a) VALUES("defghi");

     INSERT INTO t1(a) VALUES("jklmnopqrstuv");

     INSERT INTO t1(a) VALUES("wxyz0123456789-");

     UPDATE t1 SET b=a||'-'||a;

     INSERT INTO t1(a,b) SELECT a||b, b||a FROM t1;

     INSERT INTO t1(a,b) SELECT a||b, b||a FROM t1;

     INSERT INTO t1(a,b) SELECT a||b, b||a FROM t1;

     INSERT INTO t1(a,b) VALUES('one','two');

     INSERT INTO t1(a,b) SELECT a, b FROM t1;

     UPDATE t1 SET spacer = CASE WHEN rowid&1 THEN 'x' ELSE 'xx' END;

     SELECT count(*) FROM t1;

   }

 } 66

 do_test utf16align-1.1 {

   set unaligned_string_counter

 } 0

 # Creating an index that uses the unaligned collation.  We should see

 # some unaligned strings passed to the collating function.

 #

 do_test utf16align-1.2 {

   execsql {

     CREATE INDEX t1i1 ON t1(spacer, b);

   }

   # puts $unaligned_string_counter

   expr {$unaligned_string_counter>0}

 } 1

 # Create another index that uses the aligned collation.  This time

 # there should be no unaligned accesses

 #

 do_test utf16align-1.3 {

   set unaligned_string_counter 0

   execsql {

     CREATE INDEX t1i2 ON t1(spacer, a);

   }

   expr {$unaligned_string_counter>0}

 } 0

 integrity_check utf16align-1.4

 finish_test