# 2007 April 6
#
# 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 implements regression tests for SQLite library.
#
# This file implements tests to make sure SQLite does not crash or
# segfault if it sees a corrupt database file.
#
# $Id: corrupt3.test,v 1.2 2007/04/06 21:42:22 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
# Do not use a codec for tests in this file, as the database file is
# manipulated directly using tcl scripts (using the [hexio_write] command).
#
do_not_use_codec
# These tests deal with corrupt database files
#
database_may_be_corrupt
# We must have the page_size pragma for these tests to work.
#
ifcapable !pager_pragmas||direct_read {
finish_test
return
}
# Create a database with an overflow page.
#
do_test corrupt3-1.1 {
set bigstring [string repeat 0123456789 200]
execsql {
PRAGMA auto_vacuum=OFF;
PRAGMA page_size=1024;
CREATE TABLE t1(x);
INSERT INTO t1 VALUES($bigstring);
}
file size test.db
} [expr {1024*3}]
# Verify that the file format is as we expect. The page size
# should be 1024 bytes. The only record should have a single
# overflow page. The overflow page is page 3. The pointer to
# the overflow page is on the last 4 bytes of page 2.
#
do_test corrupt3-1.2 {
hexio_get_int [hexio_read test.db 16 2]
} 1024 ;# The page size is 1024
do_test corrupt3-1.3 {
hexio_get_int [hexio_read test.db 20 1]
} 0 ;# Unused bytes per page is 0
do_test corrupt3-1.4 {
hexio_get_int [hexio_read test.db 2044 4]
} 3 ;# Overflow page is 3
do_test corrupt3-1.5 {
hexio_get_int [hexio_read test.db 2048 4]
} 0 ;# First chained overflow is 0
integrity_check corrupt3-1.6
# Make the overflow chain loop back on itself. See if the
# corruption is detected. (Actually, the last pointer in
# an overflow chain is ignored, so this is not an error.)
#
do_test corrupt3-1.7 {
db close
hexio_write test.db 2048 [hexio_render_int32 3]
sqlite3 db test.db
catchsql {
SELECT x FROM t1
}
} [list 0 $bigstring]
integrity_check corrupt3-1.8
# Change the pointer for the first page of the overflow
# change to be a non-existant page.
#
do_test corrupt3-1.9 {
db close
hexio_write test.db 2044 [hexio_render_int32 4]
sqlite3 db test.db
catchsql {
SELECT substr(x,1,10) FROM t1
}
} [list 0 0123456789]
do_test corrupt3-1.10 {
catchsql {
PRAGMA integrity_check
}
} {0 {{*** in database main ***
On tree page 2 cell 0: invalid page number 4
Page 3 is never used}}}
do_test corrupt3-1.11 {
db close
hexio_write test.db 2044 [hexio_render_int32 0]
sqlite3 db test.db
catchsql {
SELECT substr(x,1,10) FROM t1
}
} [list 1 {database disk image is malformed}]
do_test corrupt3-1.12 {
catchsql {
PRAGMA integrity_check
}
} {0 {{*** in database main ***
On tree page 2 cell 0: 1 of 1 pages missing from overflow list starting at 0
Page 3 is never used}}}
finish_test