xref: /sqlite-3.40.0/test/utf16align.test (revision 7d44b22d) 
1# 2006 February 16
2#
3# The author disclaims copyright to this source code.  In place of
4# a legal notice, here is a blessing:
5#
6#    May you do good and not evil.
7#    May you find forgiveness for yourself and forgive others.
8#    May you share freely, never taking more than you give.
9#
10#***********************************************************************
11#
12# This file contains code to verify that the SQLITE_UTF16_ALIGNED
13# flag passed into the sqlite3_create_collation() function insures
14# that all strings passed to that function are aligned on an even
15# byte boundary.
16#
17# $Id: utf16align.test,v 1.2 2008/11/07 03:29:34 drh Exp $
18
19set testdir [file dirname $argv0]
20source $testdir/tester.tcl
21
22# Skip this entire test if we do not support UTF16
23#
24ifcapable !utf16 {
25  finish_test
26  return
27}
28
29# Create a database with a UTF16 encoding.  Put in lots of string
30# data of varying lengths.
31#
32do_test utf16align-1.0 {
33  set unaligned_string_counter 0
34  add_alignment_test_collations [sqlite3_connection_pointer db]
35  sqlite3_db_config db SQLITE_DBCONFIG_DQS_DML 1
36  execsql {
37    PRAGMA encoding=UTF16;
38    CREATE TABLE t1(
39      id INTEGER PRIMARY KEY,
40      spacer TEXT,
41      a TEXT COLLATE utf16_aligned,
42      b TEXT COLLATE utf16_unaligned
43    );
44    INSERT INTO t1(a) VALUES("abc");
45    INSERT INTO t1(a) VALUES("defghi");
46    INSERT INTO t1(a) VALUES("jklmnopqrstuv");
47    INSERT INTO t1(a) VALUES("wxyz0123456789-");
48    UPDATE t1 SET b=a||'-'||a;
49    INSERT INTO t1(a,b) SELECT a||b, b||a FROM t1;
50    INSERT INTO t1(a,b) SELECT a||b, b||a FROM t1;
51    INSERT INTO t1(a,b) SELECT a||b, b||a FROM t1;
52    INSERT INTO t1(a,b) VALUES('one','two');
53    INSERT INTO t1(a,b) SELECT a, b FROM t1;
54    UPDATE t1 SET spacer = CASE WHEN rowid&1 THEN 'x' ELSE 'xx' END;
55    SELECT count(*) FROM t1;
56  }
57} 66
58do_test utf16align-1.1 {
59  set unaligned_string_counter
60} 0
61
62# Creating an index that uses the unaligned collation.  We should see
63# some unaligned strings passed to the collating function.
64#
65do_test utf16align-1.2 {
66  execsql {
67    CREATE INDEX t1i1 ON t1(spacer, b);
68  }
69  # puts $unaligned_string_counter
70  expr {$unaligned_string_counter>0}
71} 1
72
73# Create another index that uses the aligned collation.  This time
74# there should be no unaligned accesses
75#
76do_test utf16align-1.3 {
77  set unaligned_string_counter 0
78  execsql {
79    CREATE INDEX t1i2 ON t1(spacer, a);
80  }
81  expr {$unaligned_string_counter>0}
82} 0
83integrity_check utf16align-1.4
84
85# ticket #3482
86#
87db close
88sqlite3 db :memory:
89do_test utf16align-2.1 {
90  db eval {
91    PRAGMA encoding=UTF16be;
92    SELECT hex(ltrim(x'6efcda'));
93  }
94} {6EFC}
95
96finish_test
97