1# 2007 April 6 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# This file implements regression tests for SQLite library. 12# 13# This file implements tests to make sure SQLite does not crash or 14# segfault if it sees a corrupt database file. 15# 16# $Id: corrupt3.test,v 1.2 2007/04/06 21:42:22 drh Exp $ 17 18set testdir [file dirname $argv0] 19source $testdir/tester.tcl 20 21# Do not use a codec for tests in this file, as the database file is 22# manipulated directly using tcl scripts (using the [hexio_write] command). 23# 24do_not_use_codec 25 26# These tests deal with corrupt database files 27# 28database_may_be_corrupt 29 30# We must have the page_size pragma for these tests to work. 31# 32ifcapable !pager_pragmas||direct_read { 33 finish_test 34 return 35} 36 37# Create a database with an overflow page. 38# 39do_test corrupt3-1.1 { 40 set bigstring [string repeat 0123456789 200] 41 execsql { 42 PRAGMA auto_vacuum=OFF; 43 PRAGMA page_size=1024; 44 CREATE TABLE t1(x); 45 INSERT INTO t1 VALUES($bigstring); 46 } 47 file size test.db 48} [expr {1024*3}] 49 50# Verify that the file format is as we expect. The page size 51# should be 1024 bytes. The only record should have a single 52# overflow page. The overflow page is page 3. The pointer to 53# the overflow page is on the last 4 bytes of page 2. 54# 55do_test corrupt3-1.2 { 56 hexio_get_int [hexio_read test.db 16 2] 57} 1024 ;# The page size is 1024 58do_test corrupt3-1.3 { 59 hexio_get_int [hexio_read test.db 20 1] 60} 0 ;# Unused bytes per page is 0 61do_test corrupt3-1.4 { 62 hexio_get_int [hexio_read test.db 2044 4] 63} 3 ;# Overflow page is 3 64do_test corrupt3-1.5 { 65 hexio_get_int [hexio_read test.db 2048 4] 66} 0 ;# First chained overflow is 0 67 68integrity_check corrupt3-1.6 69 70# Make the overflow chain loop back on itself. See if the 71# corruption is detected. (Actually, the last pointer in 72# an overflow chain is ignored, so this is not an error.) 73# 74do_test corrupt3-1.7 { 75 db close 76 hexio_write test.db 2048 [hexio_render_int32 3] 77 sqlite3 db test.db 78 catchsql { 79 SELECT x FROM t1 80 } 81} [list 0 $bigstring] 82integrity_check corrupt3-1.8 83 84# Change the pointer for the first page of the overflow 85# change to be a non-existant page. 86# 87do_test corrupt3-1.9 { 88 db close 89 hexio_write test.db 2044 [hexio_render_int32 4] 90 sqlite3 db test.db 91 catchsql { 92 SELECT substr(x,1,10) FROM t1 93 } 94} [list 0 0123456789] 95do_test corrupt3-1.10 { 96 catchsql { 97 PRAGMA integrity_check 98 } 99} {0 {{*** in database main *** 100On tree page 2 cell 0: invalid page number 4 101Page 3 is never used}}} 102do_test corrupt3-1.11 { 103 db close 104 hexio_write test.db 2044 [hexio_render_int32 0] 105 sqlite3 db test.db 106 catchsql { 107 SELECT substr(x,1,10) FROM t1 108 } 109} [list 1 {database disk image is malformed}] 110do_test corrupt3-1.12 { 111 catchsql { 112 PRAGMA integrity_check 113 } 114} {0 {{*** in database main *** 115On tree page 2 cell 0: 1 of 1 pages missing from overflow list starting at 0 116Page 3 is never used}}} 117 118finish_test 119