3 # The author disclaims copyright to this source code. In place of
4 # a legal notice, here is a blessing:
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.
10 #***********************************************************************
11 # This file implements regression tests for SQLite library.
13 # This file implements tests to make sure SQLite does not crash or
14 # segfault if it sees a corrupt database file.
16 # $Id: corrupt3.test,v 1.2 2007/04/06 21:42:22 drh Exp $
18 set testdir [file dirname $argv0]
19 source $testdir/tester.tcl
21 # This module uses hard-coded offsets which do not work if the reserved_bytes
23 if {[nonzero_reserved_bytes]} {finish_test; return;}
25 # These tests deal with corrupt database files
27 database_may_be_corrupt
29 # We must have the page_size pragma for these tests to work.
31 ifcapable !pager_pragmas||direct_read {
36 # Create a database with an overflow page.
38 do_test corrupt3-1.1 {
39 set bigstring [string repeat 0123456789 200]
41 PRAGMA auto_vacuum=OFF;
42 PRAGMA page_size=1024;
44 INSERT INTO t1 VALUES($bigstring);
49 # Verify that the file format is as we expect. The page size
50 # should be 1024 bytes. The only record should have a single
51 # overflow page. The overflow page is page 3. The pointer to
52 # the overflow page is on the last 4 bytes of page 2.
54 do_test corrupt3-1.2 {
55 hexio_get_int [hexio_read test.db 16 2]
56 } 1024 ;# The page size is 1024
57 do_test corrupt3-1.3 {
58 hexio_get_int [hexio_read test.db 20 1]
59 } 0 ;# Unused bytes per page is 0
60 do_test corrupt3-1.4 {
61 hexio_get_int [hexio_read test.db 2044 4]
62 } 3 ;# Overflow page is 3
63 do_test corrupt3-1.5 {
64 hexio_get_int [hexio_read test.db 2048 4]
65 } 0 ;# First chained overflow is 0
67 integrity_check corrupt3-1.6
69 # Make the overflow chain loop back on itself. See if the
70 # corruption is detected. (Actually, the last pointer in
71 # an overflow chain is ignored, so this is not an error.)
73 do_test corrupt3-1.7 {
75 hexio_write test.db 2048 [hexio_render_int32 3]
81 integrity_check corrupt3-1.8
83 # Change the pointer for the first page of the overflow
84 # change to be a non-existant page.
86 do_test corrupt3-1.9 {
88 hexio_write test.db 2044 [hexio_render_int32 4]
91 SELECT substr(x,1,10) FROM t1
94 do_test corrupt3-1.10 {
96 PRAGMA integrity_check
98 } {0 {{*** in database main ***
99 On tree page 2 cell 0: invalid page number 4
100 Page 3 is never used}}}
101 do_test corrupt3-1.11 {
103 hexio_write test.db 2044 [hexio_render_int32 0]
106 SELECT substr(x,1,10) FROM t1
108 } [list 1 {database disk image is malformed}]
109 do_test corrupt3-1.12 {
111 PRAGMA integrity_check
113 } {0 {{*** in database main ***
114 On tree page 2 cell 0: 1 of 1 pages missing from overflow list starting at 0
115 Page 3 is never used}}}