1 # Copyright (C) 2015-2020 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
3 package PublicInbox::MboxGz;
7 use PublicInbox::Hval qw/to_filename/;
9 use Compress::Raw::Zlib qw(Z_FINISH Z_OK);
10 my %OPT = (-WindowBits => 15 + 16, -AppendOutput => 1);
13 my ($class, $ctx, $cb) = @_;
14 $ctx->{base_url} = $ctx->{-inbox}->base_url($ctx->{env});
15 my ($gz, $err) = Compress::Raw::Zlib::Deflate->new(%OPT);
16 $err == Z_OK or die "Deflate->new failed: $err";
17 bless { gz => $gz, cb => $cb, ctx => $ctx }, $class;
21 my ($class, $ctx, $cb, $fn) = @_;
22 my $body = $class->new($ctx, $cb);
23 # http://www.iana.org/assignments/media-types/application/gzip
24 $fn = defined($fn) && $fn ne '' ? to_filename($fn) : 'no-subject';
25 my $h = [ qw(Content-Type application/gzip),
26 'Content-Disposition', "inline; filename=$fn.mbox.gz" ];
32 $ctx->{env}->{'psgi.errors'}->print("deflate failed: $err\n");
36 # called by Plack::Util::foreach or similar
39 my $ctx = $self->{ctx} or return;
41 my $buf = delete($self->{buf});
42 while (my $smsg = $self->{cb}->($ctx)) {
43 my $mref = $ctx->{-inbox}->msg_by_smsg($smsg) or next;
44 my $h = Email::Simple->new($mref)->header_obj;
46 my $err = $gz->deflate(
47 PublicInbox::Mbox::msg_hdr($ctx, $h, $smsg->{mid}),
49 return gzip_fail($ctx, $err) if $err != Z_OK;
51 $err = $gz->deflate(PublicInbox::Mbox::msg_body($$mref), $buf);
52 return gzip_fail($ctx, $err) if $err != Z_OK;
54 return $buf if length($buf) >= 8192;
56 # be fair to other clients on public-inbox-httpd:
60 # signal that we're done and can return undef next call:
62 my $err = $gz->flush($buf, Z_FINISH);
63 ($err == Z_OK) ? $buf : gzip_fail($ctx, $err);