mirror of
https://github.com/qpdf/qpdf.git
synced 2024-11-15 17:17:08 +00:00
b356b9dfa2
fix-qdf was previously hard-coding the number of bytes for the f2 field of the xref stream entry. This addresses issue #37. Thanks aluebcke for reporting.
398 lines
8.2 KiB
Perl
Executable File
398 lines
8.2 KiB
Perl
Executable File
#!/usr/bin/env perl
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require 5.008_001;
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use warnings;
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use strict;
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use File::Basename;
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my $whoami = basename($0);
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my $dirname = dirname($0);
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if ((@ARGV == 1) && ($ARGV[0] eq '--version'))
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{
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exec "$dirname/qpdf", '--version';
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exit 2;
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}
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my $offset = 0;
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my $last_offset = 0;
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my $file = shift(@ARGV);
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if (defined $file)
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{
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open(F, "<$file") or die "$whoami: can't open $file: $!\n";
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}
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else
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{
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$file = 'stdin';
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open(F, "<&STDIN") or die "$whoami: can't dup stdin: $!\n";
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}
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binmode F;
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binmode STDOUT;
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my $line = get_line();
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if (! ((defined $line) && ($line =~ m/^%PDF-1\.\d+\b/)))
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{
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die "$whoami: $file: not a pdf file\n";
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}
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print $line;
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$line = get_line();
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die "$whoami: $file: premature EOF\n" unless defined $line;
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print $line;
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$line = get_line();
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if (! ((defined $line) && ($line =~ m/^%QDF-1.\d+\b/)))
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{
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die "$whoami: $file: not a qdf file\n";
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}
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print $line;
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my $last_obj = 0;
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my @xref = ();
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my $stream_start = 0;
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my $stream_length = 0;
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my $xref_offset = 0;
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my $xref_f1_nbytes = 0;
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my $xref_f2_nbytes = 0;
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my $xref_size = 0;
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my $cur_state = 0;
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my $st_top = ++$cur_state;
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my $st_in_obj = ++$cur_state;
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my $st_in_stream = ++$cur_state;
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my $st_after_stream = ++$cur_state;
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my $st_in_ostream_dict = ++$cur_state;
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my $st_in_ostream_offsets = ++$cur_state;
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my $st_in_ostream_outer = ++$cur_state;
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my $st_in_ostream_obj = ++$cur_state;
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my $st_in_xref_stream_dict = ++$cur_state;
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my $st_in_length = ++$cur_state;
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my $st_at_xref = ++$cur_state;
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my $st_before_trailer = ++$cur_state;
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my $st_in_trailer = ++$cur_state;
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my $st_done = ++$cur_state;
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my @ostream = ();
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my @ostream_offsets = ();
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my @ostream_discarded = ();
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my $ostream_idx = 0;
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my $ostream_id = 0;
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my $ostream_extends = "";
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my $state = $st_top;
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while (defined($line = get_line()))
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{
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if ($state == $st_top)
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{
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if ($line =~ m/^(\d+) 0 obj$/)
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{
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check_obj_id($1);
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$state = $st_in_obj;
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}
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elsif ($line =~ m/^xref$/)
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{
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$xref_offset = $last_offset;
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$state = $st_at_xref;
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}
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print $line;
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}
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elsif ($state == $st_in_obj)
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{
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print $line;
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if ($line =~ m/^stream$/)
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{
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$state = $st_in_stream;
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$stream_start = $offset;
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}
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elsif ($line =~ m/^endobj$/)
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{
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$state = $st_top;
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}
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elsif ($line =~ m,/Type /ObjStm,)
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{
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$state = $st_in_ostream_dict;
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$ostream_id = $last_obj;
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}
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elsif ($line =~ m,/Type /XRef,)
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{
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$xref_offset = $xref[-1][1];
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$xref_f1_nbytes = 0;
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my $t = $xref_offset;
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while ($t)
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{
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$t >>= 8;
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++$xref_f1_nbytes;
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}
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# Figure out how many bytes we need for ostream index.
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# Make sure we get at least 1 byte even if there are no
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# object streams.
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my $max_objects = 1;
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foreach my $e (@xref)
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{
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my ($type, $f1, $f2) = @$e;
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if ((defined $f2) && ($f2 > $max_objects))
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{
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$max_objects = $f2;
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}
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}
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while ($max_objects)
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{
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$max_objects >>=8;
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++$xref_f2_nbytes;
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}
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my $esize = 1 + $xref_f1_nbytes + $xref_f2_nbytes;
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$xref_size = 1 + @xref;
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my $length = $xref_size * $esize;
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print " /Length $length\n";
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print " /W [ 1 $xref_f1_nbytes $xref_f2_nbytes ]\n";
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$state = $st_in_xref_stream_dict;
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}
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}
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elsif ($state == $st_in_ostream_dict)
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{
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if ($line =~ m/^stream/)
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{
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$state = $st_in_ostream_offsets;
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}
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else
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{
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push(@ostream_discarded, $line);
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if ($line =~ m,/Extends (\d+ 0 R),)
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{
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$ostream_extends = $1;
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}
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}
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# discard line
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}
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elsif ($state == $st_in_ostream_offsets)
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{
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if ($line =~ m/^\%\% Object stream: object (\d+)/)
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{
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check_obj_id($1);
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$stream_start = $last_offset;
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$state = $st_in_ostream_outer;
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push(@ostream, $line);
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}
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else
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{
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push(@ostream_discarded, $line);
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}
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# discard line
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}
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elsif ($state == $st_in_ostream_outer)
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{
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adjust_ostream_xref();
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push(@ostream_offsets, $last_offset - $stream_start);
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$state = $st_in_ostream_obj;
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push(@ostream, $line);
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}
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elsif ($state == $st_in_ostream_obj)
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{
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push(@ostream, $line);
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if ($line =~ m/^\%\% Object stream: object (\d+)/)
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{
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check_obj_id($1);
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$state = $st_in_ostream_outer;
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}
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elsif ($line =~ m/^endstream/)
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{
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$stream_length = $last_offset - $stream_start;
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write_ostream();
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$state = $st_in_obj;
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}
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}
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elsif ($state == $st_in_xref_stream_dict)
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{
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if ($line =~ m,/(Length|W) ,)
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{
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# already printed
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}
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elsif ($line =~ m,/Size ,)
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{
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my $size = 1 + @xref;
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print " /Size $xref_size\n";
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}
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else
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{
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print $line;
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}
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if ($line =~ m/^stream\n/)
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{
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my $pack = "(C C$xref_f1_nbytes C$xref_f2_nbytes)";
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print pack($pack, 0, 0, 0);
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foreach my $x (@xref)
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{
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my ($type, $f1, $f2) = @$x;
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$f2 = 0 unless defined $f2;
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my @f1 = ();
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my @f2 = ();
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foreach my $d ([\@f1, $f1, $xref_f1_nbytes],
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[\@f2, $f2, $xref_f2_nbytes])
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{
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my ($fa, $f, $nbytes) = @$d;
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for (my $i = 0; $i < $nbytes; ++$i)
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{
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unshift(@$fa, $f & 0xff);
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$f >>= 8;
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}
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}
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print pack($pack, $type, @f1, @f2);
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}
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print "\nendstream\nendobj\n\n";
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print "startxref\n$xref_offset\n\%\%EOF\n";
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$state = $st_done;
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}
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}
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elsif ($state == $st_in_stream)
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{
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if ($line =~ m/^endstream$/)
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{
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$stream_length = $last_offset - $stream_start;
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$state = $st_after_stream;
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}
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print $line;
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}
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elsif ($state == $st_after_stream)
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{
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if ($line =~ m/^\%QDF: ignore_newline$/)
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{
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--$stream_length;
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}
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elsif ($line =~ m/^(\d+) 0 obj$/)
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{
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check_obj_id($1);
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$state = $st_in_length;
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}
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print $line;
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}
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elsif ($state == $st_in_length)
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{
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if ($line !~ m/^\d+$/)
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{
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die "$file:$.: expected integer\n";
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}
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my $new = "$stream_length\n";
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$offset -= length($line);
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$offset += length($new);
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print $new;
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$state = $st_top;
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}
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elsif ($state == $st_at_xref)
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{
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my $n = scalar(@xref);
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print "0 ", $n+1, "\n0000000000 65535 f \n";
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for (@xref)
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{
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my ($type, $f1, $f2) = @$_;
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printf("%010d 00000 n \n", $f1);
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}
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$state = $st_before_trailer;
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}
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elsif ($state == $st_before_trailer)
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{
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if ($line =~ m/^trailer <</)
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{
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print $line;
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$state = $st_in_trailer;
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}
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# no output
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}
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elsif ($state == $st_in_trailer)
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{
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if ($line =~ m/^ \/Size \d+$/)
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{
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print " /Size ", scalar(@xref) + 1, "\n";
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}
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else
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{
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print $line;
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}
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if ($line =~ m/^>>$/)
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{
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print "startxref\n$xref_offset\n\%\%EOF\n";
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$state = $st_done;
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}
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}
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elsif ($state == $st_done)
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{
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# ignore
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}
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}
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die "$whoami: $file: premature EOF\n" unless $state == $st_done;
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sub get_line
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{
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my $line = scalar(<F>);
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if (defined $line)
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{
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$last_offset = $offset;
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$offset += length($line);
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}
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$line;
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}
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sub check_obj_id
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{
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my $cur_obj = shift;
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if ($cur_obj != $last_obj + 1)
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{
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die "$file:$.: expected object ", $last_obj + 1, "\n";
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}
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$last_obj = $cur_obj;
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push(@xref, [1, $last_offset]);
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}
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sub adjust_ostream_xref
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{
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pop(@xref);
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push(@xref, [2, $ostream_id, $ostream_idx++]);
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}
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sub write_ostream
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{
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my $first = $ostream_offsets[0];
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my $onum = $ostream_id;
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my $offsets = "";
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my $n = scalar(@ostream_offsets);
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for (@ostream_offsets)
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{
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$_ -= $first;
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++$onum;
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$offsets .= "$onum $_\n";
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}
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my $offset_adjust = length($offsets);
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$first += length($offsets);
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$stream_length += length($offsets);
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my $dict_data = "";
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$dict_data .= " /Length $stream_length\n";
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$dict_data .= " /N $n\n";
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$dict_data .= " /First $first\n";
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if ($ostream_extends)
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{
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$dict_data .= " /Extends $ostream_extends\n";
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}
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$dict_data .= ">>\n";
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$offset_adjust += length($dict_data);
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print $dict_data;
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print "stream\n";
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print $offsets;
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foreach (@ostream)
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{
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print $_;
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}
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for (@ostream_discarded)
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{
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$offset -= length($_);
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}
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$offset += $offset_adjust;
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$ostream_idx = 0;
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$ostream_id = 0;
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@ostream = ();
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@ostream_offsets = ();
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@ostream_discarded = ();
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$ostream_extends = "";
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}
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