Viewing file:  preview.cgi (3.59 KB) -rwxr-xr-x
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#!/usr/bin/perl
# Scale some image down to the preview size
require './file-lib.pl';
&ReadParse();
use POSIX;
$p = $ENV{'PATH_INFO'};
# Try to guess type from filename
$type = &guess_mime_type($p, undef);
if (!$type) {
# No idea .. use the 'file' command
$out = &backquote_command("file ".
quotemeta(&resolve_links($p)), 1);
if ($out =~ /text|script/) {
$type = "text/plain";
}
else {
&error_exit(&text('preview_etype', $p));
}
}
# Make sure the type is OK
if ($type ne "image/gif" && $type ne "image/jpeg" && $type ne "image/png" &&
$type ne "image/tiff" && $type ne "application/pdf" &&
$type !~ /^image\/x-portable/ && $type ne "application/postscript") {
&error_exit(&text('preview_etype2', $p));
}
&switch_acl_uid_and_chroot();
if (!&can_access($p)) {
# ACL rules prevent access to file
&error_exit(&text('view_eaccess', $p));
}
# Test if the file can be opened
if (!open(FILE, $p)) {
# Unix permissions prevent access
&error_exit(&text('view_eopen', $p, $!));
}
close(FILE);
eval "use GD";
if ($@ || $type eq "image/tiff" || $type eq "application/pdf" ||
$type =~ /^image\/x-portable/ || $type eq "application/postscript") {
# Find an appropriate scaler
$pnmcmd = $type eq "image/gif" ? "giftopnm" :
$type eq "image/jpeg" ? "djpeg" :
$type eq "image/png" ? "pngtopnm" :
$type eq "image/tiff" ? "tifftopnm" :
$type =~ /^image\/x-portable/ ? "cat" :
$type eq "application/postscript" ? "pstopnm" :
$type eq "application/pdf" ? "pdftoppm" :
undef;
&has_command($pnmcmd) ||
&error_exit(&text('preview_ecmd', $pnmcmd));
&has_command("pnmscale") ||
&error_exit(&text('preview_ecmd', "pnmscale"));
&has_command("cjpeg") ||
&error_exit(&text('preview_ecmd', "cjpeg"));
# Run scaler
$width = $config{'width'} || $userconfig{'width'} || 300;
$errout = &transname();
print "Content-type: image/jpeg\n";
print "\n";
if ($type eq "application/pdf") {
# Previewing first page of PDF
$temp = &tempname();
$out = &backquote_command("$pnmcmd -f 1 -l 1 ".quotemeta($p)." ".$temp." 2>&1");
if ($? || !-r "$temp-000001.ppm") {
&error_exit("$pnmcmd failed : $out");
}
open(SCALE, "(cat $temp-000001.ppm | pnmscale --width $width | cjpeg) 2>$errout |");
push(@main::temporary_files, "$temp-000001.ppm");
}
elsif ($type eq "application/postscript") {
# Previewing first page of a postscript file
$temp = &transname();
mkdir($temp, 0755);
©_source_dest($p, "$temp/file.ps");
$out = &backquote_command("$pnmcmd $temp/file.ps 2>&1");
if ($? || !-r "$temp/file001.ppm") {
&error_exit("$pnmcmd failed : $out");
}
open(SCALE, "(cat $temp/file001.ppm | pnmscale --width $width | cjpeg) 2>$errout |");
}
else {
# Converting to JPEG
open(SCALE, "($pnmcmd <".quotemeta($p)." | pnmscale --width $width | cjpeg) 2>$errout |");
}
$err = &read_file_contents($errout);
print STDERR $err;
while(<SCALE>) {
print;
}
close(SCALE);
}
else {
# Use the GD library
$image = $type eq "image/gif" ? GD::Image->newFromGif($p) :
$type eq "image/jpeg" ? GD::Image->newFromJpeg($p) :
$type eq "image/png" ? GD::Image->newFromPng($p) : undef;
$image || &error_exit(&text('preview_egd'));
$width = $config{'width'} || $userconfig{'width'} || 300;
$height = $image->height * (($width*1.0) / $image->width);
$scaled = new GD::Image($width, $height);
$scaled->copyResampled($image, 0, 0, 0, 0, $width, $height,
$image->width, $image->height);
print "Content-type: image/jpeg\n";
print "\n";
print $scaled->jpeg();
}
sub error_exit
{
print "Content-type: text/plain\n";
print "Content-length: ",length($_[0]),"\n\n";
print $_[0];
exit;
}
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