X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FViewDiff.pm;h=6fe9a0d7610e5a345ede4c74abd362514502ce61;hb=c2bc9ebcb770a27823d8e989707f434826333b0e;hp=d22c80b97b4871a00dba47f3e8b055bd1659ab06;hpb=7ff686e90a4f26fb7c0ab29fa461329086dd28e5;p=public-inbox.git

diff --git a/lib/PublicInbox/ViewDiff.pm b/lib/PublicInbox/ViewDiff.pm
index d22c80b9..6fe9a0d7 100644
--- a/lib/PublicInbox/ViewDiff.pm
+++ b/lib/PublicInbox/ViewDiff.pm
@@ -82,10 +82,8 @@ sub anchor0 ($$$$) {
 	$fn =~ s/{(?:.+) => (.+)}/$1/ or $fn =~ s/.* => (.+)/$1/;
 	$fn = git_unquote($fn);
 
-	# long filenames will require us to walk backwards in anchor1
-	if ($fn =~ s!\A\.\.\./?!!) {
-		$ctx->{-long_path}->{$fn} = qr/\Q$fn\E\z/s;
-	}
+	# long filenames will require us to check in anchor1()
+	push(@{$ctx->{-long_path}}, $fn) if $fn =~ s!\A\.\.\./?!!;
 
 	if (my $attr = to_attr($ctx->{-apfx}.$fn)) {
 		$ctx->{-anchors}->{$attr} = 1;
@@ -105,23 +103,20 @@ sub anchor1 ($$) {
 
 	my $ok = delete $ctx->{-anchors}->{$attr};
 
-	# unlikely, check the end of all long path names we captured:
+	# unlikely, check the end of long path names we captured,
+	# assume diffstat and diff output follow the same order,
+	# and ignore different ordering (could be malicious input)
 	unless ($ok) {
-		my $lp = $ctx->{-long_path} or return;
-		foreach my $fn (keys %$lp) {
-			$pb =~ $lp->{$fn} or next;
-
-			delete $lp->{$fn};
-			$attr = to_attr($ctx->{-apfx}.$fn) or return;
-			$ok = delete $ctx->{-anchors}->{$attr} or return;
-			last;
-		}
+		my $fn = shift(@{$ctx->{-long_path}}) or return;
+		$pb =~ /\Q$fn\E\z/s or return;
+		$attr = to_attr($ctx->{-apfx}.$fn) or return;
+		$ok = delete $ctx->{-anchors}->{$attr} or return;
 	}
 	$ok ? "<a\nhref=#i$attr\nid=$attr>diff</a> --git" : undef
 }
 
-sub diff_header ($$$$) {
-	my ($dst, $x, $ctx, $top) = @_;
+sub diff_header ($$$) {
+	my ($x, $ctx, $top) = @_;
 	my (undef, undef, $pa, $pb) = splice(@$top, 0, 4); # ignore oid_{a,b}
 	my $spfx = $ctx->{-spfx};
 	my $dctx = { spfx => $spfx };
@@ -159,19 +154,23 @@ sub diff_header ($$$$) {
 		warn "BUG? <$$x> had no ^index line";
 	}
 	$$x =~ s!^diff --git!anchor1($ctx, $pb) // 'diff --git'!ems;
+	my $dst = $ctx->{obuf};
 	$$dst .= qq(<span\nclass="head">);
 	$$dst .= $$x;
 	$$dst .= '</span>';
 	$dctx;
 }
 
-sub diff_before_or_after ($$$) {
-	my ($dst, $ctx, $x) = @_;
+sub diff_before_or_after ($$) {
+	my ($ctx, $x) = @_;
 	my $linkify = $ctx->{-linkify};
+	my $dst = $ctx->{obuf};
+	my $anchors = exists($ctx->{-anchors}) ? 1 : 0;
 	for my $y (split(/(^---\n)/sm, $$x)) {
 		if ($y =~ /\A---\n\z/s) {
 			$$dst .= "---\n"; # all HTML is "\r\n" => "\n"
-		} elsif ($y =~ /^ [0-9]+ files? changed, /sm) {
+			$anchors |= 2;
+		} elsif ($anchors == 3 && $y =~ /^ [0-9]+ files? changed, /sm) {
 			# ok, looks like a diffstat, go line-by-line:
 			for my $l (split(/^/m, $y)) {
 				if ($l =~ /^ (.+)( +\| .*\z)/s) {
@@ -186,22 +185,34 @@ sub diff_before_or_after ($$$) {
 }
 
 # callers must do CRLF => LF conversion before calling this
-sub flush_diff ($$$) {
-	my ($dst, $ctx, $cur) = @_;
+sub flush_diff ($$) {
+	my ($ctx, $cur) = @_;
 
 	my @top = split($EXTRACT_DIFFS, $$cur);
-	$$cur = undef;
+	undef $$cur; # free memory
 
 	my $linkify = $ctx->{-linkify};
+	my $dst = $ctx->{obuf};
 	my $dctx; # {}, keys: Q, oid_a, oid_b
 
 	while (defined(my $x = shift @top)) {
 		if (scalar(@top) >= 4 &&
 				$top[1] =~ $IS_OID &&
 				$top[0] =~ $IS_OID) {
-			$dctx = diff_header($dst, \$x, $ctx, \@top);
+			$dctx = diff_header(\$x, $ctx, \@top);
 		} elsif ($dctx) {
 			my $after = '';
+
+			# Quiet "Complex regular subexpression recursion limit"
+			# warning.  Perl will truncate matches upon hitting
+			# that limit, giving us more (and shorter) scalars than
+			# would be ideal, but otherwise it's harmless.
+			#
+			# We could replace the `+' metacharacter with `{1,100}'
+			# to limit the matches ourselves to 100, but we can
+			# let Perl do it for us, quietly.
+			no warnings 'regexp';
+
 			for my $s (split(/((?:(?:^\+[^\n]*\n)+)|
 					(?:(?:^-[^\n]*\n)+)|
 					(?:^@@ [^\n]+\n))/xsm, $x)) {
@@ -227,9 +238,9 @@ sub flush_diff ($$$) {
 					$$dst .= $linkify->to_html($s);
 				}
 			}
-			diff_before_or_after($dst, $ctx, \$after) unless $dctx;
+			diff_before_or_after($ctx, \$after) unless $dctx;
 		} else {
-			diff_before_or_after($dst, $ctx, \$x);
+			diff_before_or_after($ctx, \$x);
 		}
 	}
 }