sl@0: # 2006 February 16
sl@0: #
sl@0: # The author disclaims copyright to this source code.  In place of
sl@0: # a legal notice, here is a blessing:
sl@0: #
sl@0: #    May you do good and not evil.
sl@0: #    May you find forgiveness for yourself and forgive others.
sl@0: #    May you share freely, never taking more than you give.
sl@0: #
sl@0: #***********************************************************************
sl@0: # 
sl@0: # This file contains code to verify that the SQLITE_UTF16_ALIGNED
sl@0: # flag passed into the sqlite3_create_collation() function insures
sl@0: # that all strings passed to that function are aligned on an even
sl@0: # byte boundary.
sl@0: #
sl@0: # $Id: utf16align.test,v 1.1 2006/02/16 18:16:38 drh Exp $
sl@0: 
sl@0: set testdir [file dirname $argv0]
sl@0: source $testdir/tester.tcl
sl@0: 
sl@0: # Skip this entire test if we do not support UTF16
sl@0: #
sl@0: ifcapable !utf16 {
sl@0:   finish_test
sl@0:   return
sl@0: }
sl@0: 
sl@0: # Create a database with a UTF16 encoding.  Put in lots of string
sl@0: # data of varying lengths.
sl@0: #
sl@0: do_test utf16align-1.0 {
sl@0:   set unaligned_string_counter 0
sl@0:   add_alignment_test_collations [sqlite3_connection_pointer db]
sl@0:   execsql {
sl@0:     PRAGMA encoding=UTF16;
sl@0:     CREATE TABLE t1(
sl@0:       id INTEGER PRIMARY KEY,
sl@0:       spacer TEXT,
sl@0:       a TEXT COLLATE utf16_aligned,
sl@0:       b TEXT COLLATE utf16_unaligned
sl@0:     );
sl@0:     INSERT INTO t1(a) VALUES("abc");
sl@0:     INSERT INTO t1(a) VALUES("defghi");
sl@0:     INSERT INTO t1(a) VALUES("jklmnopqrstuv");
sl@0:     INSERT INTO t1(a) VALUES("wxyz0123456789-");
sl@0:     UPDATE t1 SET b=a||'-'||a;
sl@0:     INSERT INTO t1(a,b) SELECT a||b, b||a FROM t1;
sl@0:     INSERT INTO t1(a,b) SELECT a||b, b||a FROM t1;
sl@0:     INSERT INTO t1(a,b) SELECT a||b, b||a FROM t1;
sl@0:     INSERT INTO t1(a,b) VALUES('one','two');
sl@0:     INSERT INTO t1(a,b) SELECT a, b FROM t1;
sl@0:     UPDATE t1 SET spacer = CASE WHEN rowid&1 THEN 'x' ELSE 'xx' END;
sl@0:     SELECT count(*) FROM t1;
sl@0:   }
sl@0: } 66
sl@0: do_test utf16align-1.1 {
sl@0:   set unaligned_string_counter
sl@0: } 0
sl@0: 
sl@0: # Creating an index that uses the unaligned collation.  We should see
sl@0: # some unaligned strings passed to the collating function.
sl@0: #
sl@0: do_test utf16align-1.2 {
sl@0:   execsql {
sl@0:     CREATE INDEX t1i1 ON t1(spacer, b);
sl@0:   }
sl@0:   # puts $unaligned_string_counter
sl@0:   expr {$unaligned_string_counter>0}
sl@0: } 1
sl@0: 
sl@0: # Create another index that uses the aligned collation.  This time
sl@0: # there should be no unaligned accesses
sl@0: #
sl@0: do_test utf16align-1.3 {
sl@0:   set unaligned_string_counter 0
sl@0:   execsql {
sl@0:     CREATE INDEX t1i2 ON t1(spacer, a);
sl@0:   }
sl@0:   expr {$unaligned_string_counter>0}
sl@0: } 0
sl@0: integrity_check utf16align-1.4
sl@0: 
sl@0: finish_test