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# 2010 June 03
#
# 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 contains common code used by many different malloc tests
# within the test suite.
#
proc wal_file_size {nFrame pgsz} {
expr {32 + ($pgsz+24)*$nFrame}
}
proc wal_frame_count {zFile pgsz} {
if {[file exists $zFile]==0} { return 0 }
set f [file size $zFile]
if {$f < 32} { return 0 }
expr {($f - 32) / ($pgsz+24)}
}
proc wal_cksum_intlist {ckv1 ckv2 intlist} {
upvar $ckv1 c1
upvar $ckv2 c2
foreach {v1 v2} $intlist {
set c1 [expr {($c1 + $v1 + $c2)&0xFFFFFFFF}]
set c2 [expr {($c2 + $v2 + $c1)&0xFFFFFFFF}]
}
}
# This proc calculates checksums in the same way as those used by SQLite
# in WAL files. If the $endian argument is "big", then checksums are
# calculated by interpreting data as an array of big-endian integers. If
# it is "little", data is interpreted as an array of little-endian integers.
#
proc wal_cksum {endian ckv1 ckv2 blob} {
upvar $ckv1 c1
upvar $ckv2 c2
if {$endian!="big" && $endian!="little"} {
return -error "Bad value \"$endian\" - must be \"big\" or \"little\""
}
set scanpattern I*
if {$endian == "little"} { set scanpattern i* }
binary scan $blob $scanpattern values
wal_cksum_intlist c1 c2 $values
}
proc wal_set_walhdr {filename {intlist {}}} {
if {[llength $intlist]==6} {
set blob [binary format I6 $intlist]
set endian little
if {[lindex $intlist 0] & 0x00000001} { set endian big }
set c1 0
set c2 0
wal_cksum $endian c1 c2 $blob
append blob [binary format II $c1 $c2]
set fd [open $filename r+]
fconfigure $fd -translation binary
fconfigure $fd -encoding binary
seek $fd 0
puts -nonewline $fd $blob
close $fd
}
set fd [open $filename]
fconfigure $fd -translation binary
fconfigure $fd -encoding binary
set blob [read $fd 24]
close $fd
binary scan $blob I6 ints
set ints
}
proc wal_fix_walindex_cksum {hdrvar} {
upvar $hdrvar hdr
set c1 0
set c2 0
wal_cksum_intlist c1 c2 [lrange $hdr 0 9]
lset hdr 10 $c1
lset hdr 11 $c2
}
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