CLI v1.0.168

ReactNativeClient/lib/sql-extensions/sqlite/test/corruptF.test

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+# 2012 January 12
+#
+# 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.
+#
+#***********************************************************************
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix corruptF
+
+# 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
+
+proc str {i} { format %08d $i }
+
+# Create a 6 page database containing a single table - t1. Table t1 
+# consists of page 2 (the root page) and pages 5 and 6 (leaf pages). 
+# Database pages 3 and 4 are on the free list.
+#
+proc create_test_db {} {
+  catch { db close }
+  forcedelete test.db
+  sqlite3 db test.db
+  db func str str
+  execsql {
+    PRAGMA auto_vacuum = 0;
+    PRAGMA page_size = 1024;
+    CREATE TABLE t1(x);         /* root page = 2 */
+    CREATE TABLE t2(x);         /* root page = 3 */
+    CREATE TABLE t3(x);         /* root page = 4 */
+
+    INSERT INTO t1 VALUES(str(1));
+    INSERT INTO t1 SELECT str(rowid+1) FROM t1;
+    INSERT INTO t1 SELECT str(rowid+2) FROM t1;
+    INSERT INTO t1 SELECT str(rowid+4) FROM t1;
+    INSERT INTO t1 SELECT str(rowid+8) FROM t1;
+    INSERT INTO t1 SELECT str(rowid+16) FROM t1;
+    INSERT INTO t1 SELECT str(rowid+32) FROM t1;
+    INSERT INTO t1 SELECT str(rowid+64) FROM t1;
+    DROP TABLE t2;
+    DROP TABLE t3;
+  }
+  db close
+}
+
+do_test 1.1 { create_test_db } {}
+
+# Check the db is as we expect. 6 pages in total, with 3 and 4 on the free
+# list. Page 3 is the free list trunk and page 4 is a leaf.
+#
+do_test 1.2 { file size test.db } [expr 6*1024]
+do_test 1.3 { hexio_read test.db 32 4 } 00000003
+do_test 1.4 { hexio_read test.db [expr 2*1024] 12 } 000000000000000100000004
+
+# Change the free-list entry to page 6 and reopen the db file.
+do_test 1.5 { 
+  hexio_write test.db [expr 2*1024 + 8] 00000006 
+  sqlite3 db test.db
+} {}
+
+# Now create a new table in the database file. The root of the new table
+# is page 6, which is also the right-most leaf page in table t1.
+#
+do_execsql_test 1.6 { 
+  CREATE TABLE t4(x);
+  SELECT * FROM sqlite_master;
+} {
+  table t1 t1 2 {CREATE TABLE t1(x)} 
+  table t4 t4 6 {CREATE TABLE t4(x)}
+}
+
+# At one point this was causing an assert to fail.
+#
+# This statement opens a cursor on table t1 and does a full table scan. As
+# each row is visited, it is copied into table t4. There is no temporary
+# table.
+#
+# When the t1 cursor reaches page 6 (which is both the right-most leaf of
+# t1 and the root of t4), it continues to iterate through the keys within
+# it (which at this point are keys that have been inserted into t4). And
+# for each row visited, another row is inserted into page 6 - it being the
+# root page of t4. Eventually, page 6 becomes full and the height of the
+# b-tree for table t4 increased. From the point of view of the t1 cursor,
+# this unexpectedly reduces the number of keys on page 6 in the middle of
+# its iteration, which causes an assert() to fail.
+#
+db_save_and_close
+if 1 {
+for {set i 0} {$i < 128} {incr i} {
+  db_restore_and_reopen
+  do_test 1.7.$i { 
+    set res [
+      catchsql { INSERT INTO t4 SELECT x FROM t1 WHERE rowid>$i }
+    ]
+    if {$res == "0 {}" || $res == "1 {database disk image is malformed}"} {
+      set res ""
+    }
+    set res
+  } {}
+}
+}
+
+do_test 2.1 { create_test_db } {}
+do_test 2.2 { file size test.db } [expr 6*1024]
+do_test 2.3 { hexio_read test.db 32 4 } 00000003
+do_test 2.4 { hexio_read test.db [expr 2*1024] 12 } 000000000000000100000004
+
+# Change the free-list entry to page 5 and reopen the db file.
+do_test 2.5 { 
+  hexio_write test.db [expr 2*1024 + 8] 00000005 
+  sqlite3 db test.db
+} {}
+
+# Now create a new table in the database file. The root of the new table
+# is page 5, which is also the right-most leaf page in table t1.
+#
+do_execsql_test 2.6 { 
+  CREATE TABLE t4(x);
+  SELECT * FROM sqlite_master;
+} {
+  table t1 t1 2 {CREATE TABLE t1(x)} 
+  table t4 t4 5 {CREATE TABLE t4(x)}
+}
+
+db_save_and_close
+for {set i 127} {$i >= 0} {incr i -1} {
+  db_restore_and_reopen
+  do_test 2.7.$i { 
+    set res [
+      catchsql { 
+        INSERT INTO t4 SELECT x FROM t1 WHERE rowid<$i ORDER BY rowid DESC 
+      }
+    ]
+    if {$res == "0 {}" || $res == "1 {database disk image is malformed}"} {
+      set res ""
+    }
+    set res
+  } {}
+}
+
+finish_test