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git-svn: use sys* IO functions for reading rev_db

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Using buffered IO for reading 40-41 bytes at a time isn't very
efficient.  Buffering writes for a short duration is alright
since we close() right away and buffers will be flushed.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
This commit is contained in:
Eric Wong 2007-01-31 17:57:36 -08:00
parent 9c93fee51e
commit ce4b4af7ff
1 changed files with 9 additions and 15 deletions
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24
git-svn.perl
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@ -891,23 +891,20 @@ sub last_rev_commit {
my $rl;
open my $fh, '<', $self->{db_path} or
croak "$self->{db_path} not readable: $!\n";
seek $fh, $offset, 2;
$rl = readline $fh;
defined $rl or return (undef, undef);
sysseek($fh, $offset, 2); # don't care for errors
sysread($fh, $rl, 41) == 41 or return (undef, undef);
chomp $rl;
while (('0' x40) eq $rl && tell $fh != 0) {
while (('0' x40) eq $rl && sysseek($fh, 0, 1) != 0) {
$offset -= 41;
seek $fh, $offset, 2;
$rl = readline $fh;
defined $rl or return (undef, undef);
sysseek($fh, $offset, 2); # don't care for errors
sysread($fh, $rl, 41) == 41 or return (undef, undef);
chomp $rl;
}
if ($c) {
die "$self->{db_path} and ", $self->refname,
" inconsistent!:\n$c != $rl\n";
}
my $rev = tell $fh;
croak $! if ($rev < 0);
my $rev = sysseek($fh, 0, 1) or croak $!;
$rev = ($rev - 41) / 41;
close $fh or croak $!;
($self->{last_rev}, $self->{last_commit}) = ($rev, $c);
@ -1419,12 +1416,9 @@ sub rev_db_get {
my $ret;
my $offset = $rev * 41;
open my $fh, '<', $self->{db_path} or croak $!;
if (seek $fh, $offset, 0) {
$ret = readline $fh;
if (defined $ret) {
chomp $ret;
$ret = undef if ($ret =~ /^0{40}$/);
}
if (sysseek($fh, $offset, 0) == $offset) {
my $read = sysread($fh, $ret, 40);
$ret = undef if ($read != 40 || $ret eq ('0'x40));
}
close $fh or croak $!;
$ret;