--- /dev/null
+# Copyright (C) 2020 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# reader for mbox variants we support
+package PublicInbox::MboxReader;
+use strict;
+use v5.10.1;
+use Data::Dumper;
+$Data::Dumper::Useqq = 1; # should've been the default, for bad data
+
+my $from_strict =
+ qr/^From \S+ +\S+ \S+ +\S+ [^\n:]+:[^\n:]+:[^\n:]+ [^\n:]+\n/sm;
+
+sub _mbox_from {
+ my ($mbfh, $from_re, $eml_cb, @arg) = @_;
+ my $buf = '';
+ my @raw;
+ while (defined(my $r = read($mbfh, $buf, 65536, length($buf)))) {
+ if ($r == 0) { # close here to check for "curl --fail"
+ close($mbfh) or die "error closing mbox: \$?=$? $!";
+ @raw = ($buf);
+ } else {
+ @raw = split(/$from_strict/mos, $buf, -1);
+ next if scalar(@raw) == 0;
+ $buf = pop(@raw); # last bit may be incomplete
+ }
+ @raw = grep /[^ \t\r\n]/s, @raw; # skip empty messages
+ while (defined(my $raw = shift @raw)) {
+ $raw =~ s/\r?\n\z//s;
+ $raw =~ s/$from_re/$1/gms;
+ my $eml = PublicInbox::Eml->new(\$raw);
+ $eml_cb->($eml, @arg);
+ }
+ return if $r == 0; # EOF
+ }
+ die "error reading mboxo/mboxrd handle: $!";
+}
+
+sub mboxrd {
+ my (undef, $mbfh, $eml_cb, @arg) = @_;
+ _mbox_from($mbfh, qr/^>(>*From )/ms, $eml_cb, @arg);
+}
+
+sub mboxo {
+ my (undef, $mbfh, $eml_cb, @arg) = @_;
+ _mbox_from($mbfh, qr/^>(From )/ms, $eml_cb, @arg);
+}
+
+sub _cl_body {
+ my ($mbfh, $bref, $cl) = @_;
+ my $body = substr($$bref, 0, $cl, '');
+ my $need = $cl - length($body);
+ if ($need > 0) {
+ $mbfh or die "E: needed $need bytes after EOF";
+ defined(my $r = read($mbfh, $body, $need, length($body))) or
+ die "E: read error: $!\n";
+ $r == $need or die "E: read $r of $need bytes\n";
+ }
+ \$body;
+}
+
+sub _extract_hdr {
+ my ($ref) = @_;
+ if (index($$ref, "\r\n") < 0 && (my $pos = index($$ref, "\n\n")) >= 0) {
+ # likely on *nix
+ \substr($$ref, 0, $pos + 2, ''); # sv_chop on $$ref
+ } elsif ($$ref =~ /\r?\n\r?\n/s) {
+ \substr($$ref, 0, $+[0], ''); # sv_chop on $$ref
+ } else {
+ undef
+ }
+}
+
+sub _mbox_cl ($$$;@) {
+ my ($mbfh, $uxs_from, $eml_cb, @arg) = @_;
+ my $buf = '';
+ while (defined(my $r = read($mbfh, $buf, 65536, length($buf)))) {
+ if ($r == 0) { # detect "curl --fail"
+ close($mbfh) or
+ die "error closing mboxcl/mboxcl2: \$?=$? $!";
+ undef $mbfh;
+ }
+ while (my $hdr = _extract_hdr(\$buf)) {
+ $$hdr =~ s/\A[\r\n]*From [^\n]*\n//s or
+ die "E: no 'From ' line in:\n", Dumper($hdr);
+ my $eml = PublicInbox::Eml->new($hdr);
+ my @cl = $eml->header_raw('Content-Length');
+ my $n = scalar(@cl);
+ $n == 0 and die "E: Content-Length missing in:\n",
+ Dumper($eml->as_string);
+ $n == 1 or die "E: multiple ($n) Content-Length in:\n",
+ Dumper($eml->as_string);
+ $cl[0] =~ /\A[0-9]+\z/ or die
+ "E: Content-Length `$cl[0]' invalid\n",
+ Dumper($eml->as_string);
+ if (($eml->{bdy} = _cl_body($mbfh, \$buf, $cl[0]))) {
+ $uxs_from and
+ ${$eml->{bdy}} =~ s/^>From /From /sgm;
+ }
+ $eml_cb->($eml, @arg);
+ }
+ if ($r == 0) {
+ $buf =~ /[^ \r\n\t]/ and
+ warn "W: leftover at end of mboxcl/mboxcl2:\n",
+ Dumper(\$buf);
+ return;
+ }
+ }
+ die "error reading mboxcl/mboxcl2 handle: $!";
+}
+
+sub mboxcl {
+ my (undef, $mbfh, $eml_cb, @arg) = @_;
+ _mbox_cl($mbfh, 1, $eml_cb, @arg);
+}
+
+sub mboxcl2 {
+ my (undef, $mbfh, $eml_cb, @arg) = @_;
+ _mbox_cl($mbfh, undef, $eml_cb, @arg);
+}
+
+sub new { bless \(my $x), __PACKAGE__ }
+
+1;
--- /dev/null
+#!perl -w
+# Copyright (C) 2020 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use strict;
+use v5.10.1;
+use Test::More;
+use PublicInbox::TestCommon;
+use List::Util qw(shuffle);
+use PublicInbox::Eml;
+use Fcntl qw(SEEK_SET);
+require_ok 'PublicInbox::MboxReader';
+require_ok 'PublicInbox::LeiToMail';
+my %raw = (
+ hdr_only => "From: header-only\@example.com\n\n",
+ small_from => "From: small-from\@example.com\n\nFrom hell\n",
+ small => "From: small\@example.com\n\nfrom hell\n",
+ big_hdr_only => "From: big-header\@example.com\n" .
+ (('A: '.('a' x 72)."\n") x 1000)."\n",
+ big_body => "From: big-body\@example.com\n\n".
+ (('b: '.('b' x 72)."\n") x 1000) .
+ "From hell\n",
+ big_all => "From: big-all\@example.com\n".
+ (("A: ".('a' x 72)."\n") x 1000). "\n" .
+ (("b: ".('b' x 72)."\n") x 1000) .
+ "From hell\n",
+);
+
+if ($ENV{TEST_EXTRA}) {
+ for my $fn (glob('t/*.eml'), glob('t/*/*.{patch,eml}')) {
+ $raw{$fn} = eml_load($fn)->as_string;
+ }
+}
+
+my $reader = PublicInbox::MboxReader->new;
+my $write_in_full = PublicInbox::LeiToMail->can('write_in_full');
+my $check_fmt = sub {
+ my $fmt = shift;
+ my @order = shuffle(keys %raw);
+ my $eml2mbox = PublicInbox::LeiToMail->can("eml2$fmt");
+ open my $fh, '+>', undef or BAIL_OUT "open: $!";
+ for my $k (@order) {
+ my $eml = PublicInbox::Eml->new($raw{$k});
+ my $buf = $eml2mbox->($eml);
+ $write_in_full->($fh, $buf, undef);
+ }
+ seek($fh, 0, SEEK_SET) or BAIL_OUT "seek: $!";
+ $reader->$fmt($fh, sub {
+ my ($eml) = @_;
+ my $cur = shift @order;
+ my @cl = $eml->header_raw('Content-Length');
+ if ($fmt =~ /\Amboxcl/) {
+ is(scalar(@cl), 1, "Content-Length set $fmt $cur");
+ my $raw = $eml->body_raw;
+ my $adj = 0;
+ if ($fmt eq 'mboxcl') {
+ my @from = ($raw =~ /^(From )/smg);
+ $adj = scalar(@from);
+ }
+ is(length($raw), $cl[0] - $adj,
+ "Content-Length is correct $fmt $cur");
+ # clobber for ->as_string comparison below
+ $eml->header_set('Content-Length');
+ } else {
+ is(scalar(@cl), 0, "Content-Length unset $fmt $cur");
+ }
+ my $orig = PublicInbox::Eml->new($raw{$cur});
+ is($eml->as_string, $orig->as_string,
+ "read back original $fmt $cur");
+ });
+};
+my @mbox = qw(mboxrd mboxo mboxcl mboxcl2);
+for my $fmt (@mbox) { $check_fmt->($fmt) }
+s/\n/\r\n/sg for (values %raw);
+for my $fmt (@mbox) { $check_fmt->($fmt) }
+
+done_testing;