Begin adding the zeroblob API to support incremental blob i/o. (CVS 3894)

FossilOrigin-Name: 7a01836dde45098796693bc6cb6045c4059adf1a

test/btree9.test

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+# 2007 May 01
+#
+# 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.  The
+# focus of this script is btree database backend.
+#
+# $Id: btree9.test,v 1.1 2007/05/02 01:34:32 drh Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# The sqlite3BtreeInsert() API now has an additional "nZero" parameter
+# which specifies the number of zero bytes to append to the end of the
+# data.  This feature allows large zero-filled BLOBs to be created without
+# having to allocate a big chunk of memory to instantiate the blob.
+#
+# The following code tests the new feature.
+#
+
+# Create the database
+#
+do_test btree9-1.1 {
+  file delete -force test1.bt
+  file delete -force test1.bt-journal
+  set b1 [btree_open test1.bt 2000 0]
+  btree_begin_transaction $b1
+  set t1 [btree_create_table $b1 5]
+  set c1 [btree_cursor $b1 $t1 1]
+  btree_insert $c1 1 data-for-1 20000
+  btree_move_to $c1 1
+  btree_key $c1
+} {1}
+do_test btree9-1.2 {
+  btree_payload_size $c1
+} {20010}
+
+
+btree_close_cursor $c1
+btree_commit $b1
+btree_close $b1
+
+finish_test