# 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