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Or the SQLITE_UTF16_ALIGNED with the encoding field in

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sqlite3_create_collation and UTF16 strings will always be aligned
on an even byte boundary when passed into the comparison function. (CVS 3103)

FossilOrigin-Name: 7a1701e8c562087d364dff28cd7cad7ca4cdb5ae
This commit is contained in:
drh
2006-02-16 18:16:36 +00:00
parent 7e310a420b
commit 7d9bd4e19e
8 changed files with 203 additions and 51 deletions
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84
test/utf16align.test Normal file
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# 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