github.com/jdgcs/sqlite3@v1.12.1-0.20210908114423-bc5f96e4dd51/testdata/tcl/utf16align.test (about)

     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  
    19  set testdir [file dirname $argv0]
    20  source $testdir/tester.tcl
    21  
    22  # Skip this entire test if we do not support UTF16
    23  #
    24  ifcapable !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  #
    32  do_test utf16align-1.0 {
    33    set unaligned_string_counter 0
    34    add_alignment_test_collations [sqlite3_connection_pointer db]
    35    execsql {
    36      PRAGMA encoding=UTF16;
    37      CREATE TABLE t1(
    38        id INTEGER PRIMARY KEY,
    39        spacer TEXT,
    40        a TEXT COLLATE utf16_aligned,
    41        b TEXT COLLATE utf16_unaligned
    42      );
    43      INSERT INTO t1(a) VALUES("abc");
    44      INSERT INTO t1(a) VALUES("defghi");
    45      INSERT INTO t1(a) VALUES("jklmnopqrstuv");
    46      INSERT INTO t1(a) VALUES("wxyz0123456789-");
    47      UPDATE t1 SET b=a||'-'||a;
    48      INSERT INTO t1(a,b) SELECT a||b, b||a FROM t1;
    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) VALUES('one','two');
    52      INSERT INTO t1(a,b) SELECT a, b FROM t1;
    53      UPDATE t1 SET spacer = CASE WHEN rowid&1 THEN 'x' ELSE 'xx' END;
    54      SELECT count(*) FROM t1;
    55    }
    56  } 66
    57  do_test utf16align-1.1 {
    58    set unaligned_string_counter
    59  } 0
    60  
    61  # Creating an index that uses the unaligned collation.  We should see
    62  # some unaligned strings passed to the collating function.
    63  #
    64  do_test utf16align-1.2 {
    65    execsql {
    66      CREATE INDEX t1i1 ON t1(spacer, b);
    67    }
    68    # puts $unaligned_string_counter
    69    expr {$unaligned_string_counter>0}
    70  } 1
    71  
    72  # Create another index that uses the aligned collation.  This time
    73  # there should be no unaligned accesses
    74  #
    75  do_test utf16align-1.3 {
    76    set unaligned_string_counter 0
    77    execsql {
    78      CREATE INDEX t1i2 ON t1(spacer, a);
    79    }
    80    expr {$unaligned_string_counter>0}
    81  } 0
    82  integrity_check utf16align-1.4
    83  
    84  # ticket #3482
    85  #
    86  db close
    87  sqlite3 db :memory:
    88  do_test utf16align-2.1 {
    89    db eval {
    90      PRAGMA encoding=UTF16be;
    91      SELECT hex(ltrim(x'6efcda'));
    92    }
    93  } {6EFC}
    94  
    95  finish_test