# 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 $testdir/tester.tcl # We must have the page_size pragma for these tests to work. # ifcapable !pager_pragmas { finish_test return } # Create a database with an overflow page. # do_test corrupt3-1.1 { set bigstring [string repeat 0123456789 200] execsql { PRAGMA auto_vacuum=OFF; PRAGMA page_size=1024; CREATE TABLE t1(x); INSERT INTO t1 VALUES($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