# 2008 June 11
#
# 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.  It specifically focuses
# on corrupt cell offsets in a btree page.
#
# $Id: corrupt7.test,v 1.3 2008/07/25 14:53:17 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 simple, small database.
#
do_test corrupt7-1.1 {
  execsql {
    PRAGMA auto_vacuum=OFF;
    PRAGMA page_size=1024;
    CREATE TABLE t1(x);
    INSERT INTO t1(x) VALUES(1);
    INSERT INTO t1(x) VALUES(2);
    INSERT INTO t1(x) SELECT x+2 FROM t1;
    INSERT INTO t1(x) SELECT x+4 FROM t1;
    INSERT INTO t1(x) SELECT x+8 FROM t1;
  }
  file size test.db
} [expr {1024*2}]

# Verify that the file format is as we expect.  The page size
# should be 1024 bytes.
#
do_test corrupt7-1.2 {
  hexio_get_int [hexio_read test.db 16 2]
} 1024   ;# The page size is 1024
do_test corrupt7-1.3 {
  hexio_get_int [hexio_read test.db 20 1]
} 0      ;# Unused bytes per page is 0

integrity_check corrupt7-1.4

# Deliberately corrupt some of the cell offsets in the btree page
# on page 2 of the database.
#
do_test corrupt7-2.1 {
  db close
  hexio_write test.db 1062 FF
  sqlite3 db test.db
  db eval {PRAGMA integrity_check(1)}
} {{*** in database main ***
Corruption detected in cell 15 on page 2}}
do_test corrupt7-2.2 {
  db close
  hexio_write test.db 1062 04
  sqlite3 db test.db
  db eval {PRAGMA integrity_check(1)}
} {{*** in database main ***
Corruption detected in cell 15 on page 2}}

finish_test