This file is indexed.

/usr/bin/diffindex-rred is in apt-file 2.5.5ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
#!/usr/bin/perl -w

# Copyright 2008 Stefan Fritsch <sf@debian.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

use strict;
use File::Temp qw/tmpnam/;

if ( !scalar @ARGV or $ARGV[0] eq '-h' or $ARGV[0] eq '--help' ) {
    print << "EOF";
usage:
$0 <diff1> [ <diff2> [...] ]

Input will be taken from stdin and written to stdout.
The files diff1 ... need to be ed style diffs from 'diff --ed'.
*.gz, *.bz2, and *.lzo patches are decompressed automatically
EOF
    exit 1 if !scalar @ARGV;
    exit 0;
}

my $patches;
my $filename;

foreach my $filename (@ARGV) {
    if ( $filename =~ m{\.gz$} ) {
        $filename = "gunzip -c $filename |";
    }
    elsif ( $filename =~ m{\.bz2$} ) {
        $filename = "bunzip2 -c $filename |";
    }
    elsif ( $filename =~ m{\.lzo$} ) {
        $filename = "lzop -dc $filename |";
    }
    else {
        $filename = "<$filename";
    }
    $patches = merge_patches(read_patch($filename), $patches);
}


my $cur = 1;
my $p;
while (defined ($p = $patches->() )) {
    my ( $op, $lines, $lines_ref ) = @{$p};
    if ( $op eq 'D' ) {
        die "Invalid number in D: $lines" unless $lines > 0;
        while ($lines-- > 0) {
            my $line = <STDIN>;
            if ( !defined $line ) {
                die "end of input while at: @{$p}\n";
            }
        }
    }
    elsif ($op eq 'I') {
        print @{$lines_ref};
    }
    elsif ($op eq 'C') {
        die "Invalid number in C: $lines" unless $lines > 0;
        while ($lines-- > 0) {
            my $line = <STDIN>;
            if ( !defined $line ) {
                die "end of input while at: @{$p}\n";
            }
            print $line;
        }
    }
}
# copy rest of file
my $line;
while ( defined( $line = <STDIN> ) ) {
    print $line;
}


# Reads a diff --ed style patch file
# Returns iterator function over patch hunks
# - in reverse order
# - converted into simple operations: _C_opy, _I_nsert, _D_elete
# Each hunk is an array consisting of
# - operation
# - number of lines
# - ref to array of lines (only for insert)
sub read_patch {
    my $filename = shift;

    open( my $fh_patch, $filename ) or die "Could not open '$filename'\n";

    my $line;
    my @hunks;

    # current position in the file
    my $num;

    while ( defined( $line = <$fh_patch> ) ) {
        chomp $line;
        my ($op, $n, $m);
        if ( $line =~ /^(\d+)(a)$/ ) {
            # Na: add lines after line N
            $n = $1;
            $op = $2;
            $m = $n;
            $n++;
        }
        elsif ( $line =~ /^(\d+)([cd])$/ ) {
            # Nd: remove line N
            # Nc: remove line N, then insert after line N-1
            $n = $1;
            $op = $2;
            $m = $n;
        }
        elsif ( $line =~ /^(\d+),(\d+)([cd])$/ ) {
            # N,Md: remove lines N to M
            # N,Mc: remove lines N to M, then insert after line M-1
            $n = $1;
            $m = $2;
            $op = $3;
        }
        elsif ( $line eq 's/.//' ) {
            # replace inserted ".." line by "."
            my $lines_ref = $hunks[0]->[2];
            if ( ref($lines_ref) ne 'ARRAY') {
                die "Invalid format:$filename:$.:$line:Not preceeded by add or change\n";
            }
            if ( $lines_ref->[-1] ne "..\n" ) {
                die "Invalid format:$filename:$.:$line:Not preceeded by '..'\n";
            }
            else {
                $lines_ref->[-1] = ".\n";
            }
        }
        elsif ( $line eq 'a' ) {
            # insert some more lines after the 's/.//' replacement
            my $lines_ref = $hunks[0]->[2];
            if ( ref($lines_ref) ne 'ARRAY' ) {
                die "Invalid format:$filename:$.:$line:Not preceeded by add or change\n";
            }
            while ( defined( $line = <$fh_patch> ) and $line ne ".\n" ) {
                push @$lines_ref, $line;
                $hunks[0]->[1]++;
            }
        }
        else {
            die "Invalid format:$filename:$.:$line\n";
        }

        if (!defined $op) {
            # we are merging with the last op
            next;
        }

        if ( $num ) {
            if ( $num < $n || $num < $m ) {
                die "Not in reverse order:$filename:$.:$line\n$num\n";
            }
            my $copy = $num - $m - 1;
            unshift @hunks, [ 'C', $copy ] if $copy; 
        }
        $num = $n;

        if ($op eq 'd' || $op eq 'c') {
            unshift @hunks, [ 'D', $m - $n + 1];
        }
        if ($op eq 'a' || $op eq 'c') {
            my @lines;
            while ( defined( $line = <$fh_patch> ) and $line ne ".\n" ) {
                push @lines, $line;
            }
            unshift @hunks, [ 'I', scalar @lines, \@lines ];
        }
    }
    if (defined $num && $num > 1) {
        # copy the rest of the file, i.e. the beginning since we are operating
        # in reverse order
        unshift @hunks, [ 'C', $num - 1];
    }

    #print STDERR "@$_\n" foreach (@hunks);
    #print STDERR "\n";

    close($fh_patch) or die "Error reading patch";
    return sub { shift @hunks };
}

# merges two patches
# in1 is applied first, then in2
# returns iterator function over merged patch hunks
sub merge_patches {
    my ($in1, $in2) = @_;

    return $in1 unless $in2;
    return $in2 unless $in1;

    my $cur1 = $in1->();
    my $cur2 = $in2->();

    return sub {
        my $ret;
        while (1) {

        #print STDERR "in:cur1: @$cur1\n" if $cur1;
        #print STDERR "in:cur2: @$cur2\n" if $cur2;
            if (!defined $cur1) {
                $ret = $cur2;
                $cur2 = $in2->();
                last;
            }
            if (!defined $cur2) {
                $ret = $cur1;
                $cur1 = $in1->();
                last;
            }

            if ($cur1->[0] eq 'I') {
                $ret = $cur1;
                $cur1 = $in1->();
                last;
            }
            elsif ($cur2->[0] eq 'D') {
                $ret = $cur2;
                $cur2 = $in2->();
                last;
            }
            elsif ($cur1->[1] >= $cur2->[1]) {
                if ($cur2->[0] eq 'C') {
                   $ret = [ $cur1->[0], $cur2->[1] ];
                }
                elsif ($cur1->[0] eq 'D') {
                    # cur2 was 'I'; discard it
                    $cur1->[1] -= $cur2->[1];
                    $cur1 = $in1->() unless $cur1->[1] > 0;
                    $cur2 = $in2->();
                    next;
                }
                else {
                    # cur2 is 'I', cur1 is 'C'
                    $ret = $cur2;
                }
                $cur1->[1] -= $cur2->[1];
                $cur2 = $in2->();
                $cur1 = $in1->() unless $cur1->[1] > 0;
                last;
            }
            else {
                # cur1 is smaller than cur2
                if ($cur1->[0] eq 'D') {
                    if ($cur2->[0] eq 'I') {
                        my $n = $cur1->[1];
                        my $list_ref = $cur2->[2];
                        $cur2->[2] = [@{$list_ref}[$n .. $#{$list_ref}]];
                        $cur2->[1] -= $n;
                        $cur1 = $in1->();
                        next;
                    }
                    else {
                        $ret = $cur1;
                        $cur2->[1] -= $cur1->[1];
                        $cur1 = $in1->();
                        last;
                    }
                }
                else {
                    # cur1 is 'C'
                    my $n = $cur1->[1];
                    $ret = [ $cur2->[0], $n];
                    if ($cur2->[0] eq 'I') {
                        my $list_ref = $cur2->[2];
                        push @$ret, [@{$list_ref}[0 .. $n -1]];
                        $cur2->[2] = [@{$list_ref}[$n .. $#{$list_ref}]]
                    }
                    $cur2->[1] -= $n;
                    $cur1 = $in1->();
                    last;
                }
            }
        }
        #print STDERR "out:ret: @$ret\n" if $ret;
        return $ret;
    };
}


# our style is roughly "perltidy -pbp"
# vim:sts=4:sw=4:expandtab