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Change the WAL file format to support two kinds of checksums - one that is fast to calculate on little-endian architectures and another that is fast on big-endian architectures. A flag in the wal-header indicates which the file uses.

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FossilOrigin-Name: 65ba804dd1d31d1eef6ae3f40a3ade344a410b84
This commit is contained in:
dan
2010-05-24 10:39:36 +00:00
parent 9c0928dcb6
commit b8fd6c2fe6
5 changed files with 363 additions and 32 deletions
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7
test/wal.test
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@ -1288,8 +1288,12 @@ proc logcksum {ckv1 ckv2 blob} {
upvar $ckv1 c1
upvar $ckv2 c2
set scanpattern I*
if {$::tcl_platform(byteOrder) eq "littleEndian"} {
set scanpattern i*
}
binary scan $blob I* values
binary scan $blob $scanpattern values
foreach {v1 v2} $values {
set c1 [expr {($c1 + $v1 + $c2)&0xFFFFFFFF}]
set c2 [expr {($c2 + $v2 + $c1)&0xFFFFFFFF}]
@ -1347,6 +1351,7 @@ foreach {tn pgsz works} {
logcksum c1 c2 $framehdr
logcksum c1 c2 $framebody
set framehdr [binary format IIIIII $pg 5 22 23 $c1 $c2]
set fd [open test.db-wal w]
fconfigure $fd -encoding binary -translation binary
puts -nonewline $fd $walhdr