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-rw-r--r--lib/PublicInbox/IMAP.pm15
-rw-r--r--lib/PublicInbox/IMAPD.pm2
-rw-r--r--t/imapd.t2
-rw-r--r--xt/imapd-mbsync-oimap.t2
-rw-r--r--xt/imapd-validate.t2
5 files changed, 10 insertions, 13 deletions
diff --git a/lib/PublicInbox/IMAP.pm b/lib/PublicInbox/IMAP.pm
index 6f64dff9..5865822f 100644
--- a/lib/PublicInbox/IMAP.pm
+++ b/lib/PublicInbox/IMAP.pm
@@ -197,14 +197,10 @@ sub ensure_ranges_exist ($$$) {
         my $mailboxes = $imapd->{mailboxes};
         my $mb_top = $ibx->{newsgroup};
         my @created;
-        my $uid_min = UID_BLOCK * int($max/UID_BLOCK) + 1;
-        my $uid_end = $uid_min + UID_BLOCK - 1;
-        while ($uid_min > 0) {
-                my $sub_mailbox = "$mb_top.$uid_min-$uid_end";
+        for (my $i = int($max/UID_BLOCK); $i >= 0; --$i) {
+                my $sub_mailbox = "$mb_top.$i";
                 last if exists $mailboxes->{$sub_mailbox};
                 $mailboxes->{$sub_mailbox} = $ibx;
-                $uid_end -= UID_BLOCK;
-                $uid_min -= UID_BLOCK;
                 push @created, $sub_mailbox;
         }
         return unless @created;
@@ -216,9 +212,9 @@ sub cmd_examine ($$$) {
         my ($self, $tag, $mailbox) = @_;
         my ($ibx, $mm, $max);
 
-        if ($mailbox =~ /\A(.+)\.([0-9]+)-([0-9]+)\z/) {
-                # old mail: inbox.comp.foo.$uid_min-$uid_end
-                my ($mb_top, $uid_min, $uid_end) = ($1, $2 + 0, $3 + 0);
+        if ($mailbox =~ /\A(.+)\.([0-9]+)\z/) {
+                # old mail: inbox.comp.foo.$uid_block_idx
+                my ($mb_top, $uid_min) = ($1, $2 * UID_BLOCK + 1);
 
                 $ibx = $self->{imapd}->{mailboxes}->{lc $mailbox} or
                         return "$tag NO Mailbox doesn't exist: $mailbox\r\n";
@@ -227,6 +223,7 @@ sub cmd_examine ($$$) {
                 $max = $mm->max // 0;
                 $self->{uid_min} = $uid_min;
                 ensure_ranges_exist($self->{imapd}, $ibx, $max);
+                my $uid_end = $uid_min + UID_BLOCK - 1;
                 $max = $uid_end if $max > $uid_end;
         } else { # check for dummy inboxes
                 $ibx = $self->{imapd}->{mailboxes}->{lc $mailbox} or
diff --git a/lib/PublicInbox/IMAPD.pm b/lib/PublicInbox/IMAPD.pm
index 6488dc0f..261d7560 100644
--- a/lib/PublicInbox/IMAPD.pm
+++ b/lib/PublicInbox/IMAPD.pm
@@ -31,7 +31,7 @@ sub imapd_refresh_ibx { # pi_config->each_inbox cb
                         join(', ', @$ngname). "\n";
                 return;
         } elsif ($ngname =~ m![^a-z0-9/_\.\-\~\@\+\=:]! ||
-                 $ngname =~ /\.[0-9]+-[0-9]+\z/) {
+                 $ngname =~ /\.[0-9]+\z/) {
                 warn "mailbox name invalid: newsgroup=`$ngname'\n";
                 return;
         }
diff --git a/t/imapd.t b/t/imapd.t
index 5d9a7d11..45ee401a 100644
--- a/t/imapd.t
+++ b/t/imapd.t
@@ -17,7 +17,7 @@ if ($can_compress) { # hope this gets fixed upstream, soon
 }
 
 require_ok 'PublicInbox::IMAP';
-my $first_range = '1-'.PublicInbox::IMAP::UID_BLOCK();
+my $first_range = '0';
 
 my $level = '-Lbasic';
 SKIP: {
diff --git a/xt/imapd-mbsync-oimap.t b/xt/imapd-mbsync-oimap.t
index b2cb8737..fdaa22aa 100644
--- a/xt/imapd-mbsync-oimap.t
+++ b/xt/imapd-mbsync-oimap.t
@@ -14,7 +14,7 @@ plan skip_all => "bad characters in $inboxdir" if $inboxdir =~ m![^\w\.\-/]!;
 my ($tmpdir, $for_destroy) = tmpdir();
 my $cfg = "$tmpdir/cfg";
 my $newsgroup = 'inbox.test';
-my $mailbox = "$newsgroup.1-50000";
+my $mailbox = "$newsgroup.0";
 {
         open my $fh, '>', $cfg or BAIL_OUT "open: $!";
         print $fh <<EOF or BAIL_OUT "print: $!";
diff --git a/xt/imapd-validate.t b/xt/imapd-validate.t
index b7b66d05..aeeb43b9 100644
--- a/xt/imapd-validate.t
+++ b/xt/imapd-validate.t
@@ -39,7 +39,7 @@ if (($ENV{IMAP_TEST_URL} // '') =~ m!\Aimap://([^/]+)/(.+)\z!) {
 } else {
         require_mods(qw(DBD::SQLite));
         $make_local_server->();
-        $mailbox = "$newsgroup.1-50000";
+        $mailbox = "$newsgroup.0";
 }
 
 my %opts = (imap => \%OPT, 'imap+compress' => { %OPT, Compress => 1 });