Bug#827597: libfile-mmagic-xs-perl: Fails at identifying HTML in several cases

[Henrik Christian Grove]

Package: libfile-mmagic-xs-perl
Version: 0.09008-2+b1
Severity: normal

Dear Maintainer,

Using File::MMagic::XS I found that it sometimes identified HTML as
text/plain.

I have taken two examples and removed at lot from them to produce small
examples. (I won't call them minimal as there are at least 4 ways to
"fix" one of them).

I have attached 6 files:
1-wrong.html: An example that is far from valid HTML, but `file` still
gets right
2-wrong.html: An example that is better HTML
2-1.html: First way to "fix" 2-wrong.html
2-2.html: Second way to "fix" 2-wrong.html
2-3.html: Third way to "fix" 2-wrong.html
2-4.html: Fourth way to "fix" 2-wrong.html

Output of file and a simple perl script to determine MIME type below:

grove at mary> file
1-wrong.html                                                                                                     

1-wrong.html: HTML document, ASCII text
grove at mary> perl -E 'use File::MMagic::XS qw(:compat); my $m =
File::MMagic::XS->new(); say $m->checktype_filename("1-wrong.html")'
text/plain
grove at mary> file
2-wrong.html                                                                                                    

2-wrong.html: HTML document, ASCII text, with very long lines
grove at mary> perl -E 'use File::MMagic::XS qw(:compat); my $m =
File::MMagic::XS->new(); say $m->checktype_filename("2-wrong.html")'
text/plain
grove at mary> perl -E 'use File::MMagic::XS qw(:compat); my $m =
File::MMagic::XS->new(); say $m->checktype_filename("2-1.html")'   
text/html
grove at mary> perl -E 'use File::MMagic::XS qw(:compat); my $m =
File::MMagic::XS->new(); say $m->checktype_filename("2-2.html")'
text/html
grove at mary> perl -E 'use File::MMagic::XS qw(:compat); my $m =
File::MMagic::XS->new(); say $m->checktype_filename("2-3.html")'
text/html
grove at mary> perl -E 'use File::MMagic::XS qw(:compat); my $m =
File::MMagic::XS->new(); say $m->checktype_filename("2-4.html")'
text/html


-- System Information:
Debian Release: 8.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/8 CPU cores)
Locale: LANG=da_DK.UTF-8, LC_CTYPE=da_DK.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libfile-mmagic-xs-perl depends on:
ii  libc6                       2.19-18+deb8u4
ii  perl                        5.20.2-3+deb8u5
ii  perl-base [perlapi-5.20.0]  5.20.2-3+deb8u5

libfile-mmagic-xs-perl recommends no packages.

libfile-mmagic-xs-perl suggests no packages.

-- no debconf information

(The newer version in testing+unstable seems to be a rebuild of the same
source, so I guess that won't make a difference)

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