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- fseek -> rewind

Browse source 
- fewer read commands, less ugly array stuff :D
- much cleaner way to deal with the version flag, stored files are now differently labeled than deflated files ( we follow the zip spec better than 7-Zip :D )


git-svn-id: file:///svn/phpbb/trunk@5579 89ea8834-ac86-4346-8a33-228a782c2dd0
This commit is contained in:
David M 2006-02-24 05:30:25 +00:00
parent 835c9835d0
commit 37e0e0a4da
1 changed files with 17 additions and 22 deletions
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39
phpBB/includes/functions_compress.php
View file

@ -152,7 +152,7 @@ class compress_zip extends compress
{
// Loop the file, looking for files and folders
$dd_try = false;
fseek($this->fp, 0);
rewind($this->fp);
while (!feof($this->fp))
{
@ -163,25 +163,19 @@ class compress_zip extends compress
{
// 'Local File Header'
case "\x50\x4b\x03\x04":
// Get information about the zipped file but skip all the junk we don't need
fseek($this->fp, 4, SEEK_CUR);
$c_method = current(unpack("v", fread($this->fp, 2))); // compression method
fseek($this->fp, 4, SEEK_CUR);
$crc = current(unpack("V", fread($this->fp, 4))); // crc value
$c_size = current(unpack("V", fread($this->fp, 4))); // compressed size
$uc_size = current(unpack("V", fread($this->fp, 4))); // uncompressed size
$file_name_length = current(unpack("v", fread($this->fp, 2))); // filename length
$extra_field_length = current(unpack("v", fread($this->fp, 2))); // extra field length
$file_name = fread($this->fp, $file_name_length); // filename
// Lets get everything we need.
// We don't store the version needed to extract, the general purpose bit flag or the date and time fields
$data = unpack("@4/vc_method/@10/Vcrc/Vc_size/Vuc_size/vname_len/vextra_field", fread($this->fp, 26));
$file_name = fread($this->fp, $data['name_len']); // filename
if ($extra_field_length)
if ($data['extra_field'])
{
fread($this->fp, $extra_field_length);
fread($this->fp, $data['extra_field']); // extra field
}
$target_filename = "$dst$file_name";
if (!$uc_size && !$crc && substr($file_name, -1, 1) == '/')
if (!$data['uc_size'] && !$data['crc'] && substr($file_name, -1, 1) == '/')
{
if (!is_dir($target_filename))
{
@ -206,18 +200,18 @@ class compress_zip extends compress
continue;
}
if (!$uc_size)
if (!$data['uc_size'])
{
$content = '';
}
else
{
$content = fread($this->fp, $c_size);
$content = fread($this->fp, $data['c_size']);
}
$fp = fopen($target_filename, "w");
switch ($c_method)
switch ($data['c_method'])
{
case 0:
// Not compressed
@ -226,7 +220,7 @@ class compress_zip extends compress
case 8:
// Deflate
fwrite($fp, gzinflate($content, $uc_size));
fwrite($fp, gzinflate($content, $data['uc_size']));
break;
case 12:
@ -287,6 +281,7 @@ class compress_zip extends compress
{
$unc_len = $c_len = $crc = 0;
$zdata = '';
$var_ext = 10;
}
else
{
@ -294,12 +289,14 @@ class compress_zip extends compress
$crc = crc32($data);
$zdata = gzdeflate($data);
$c_len = strlen($zdata);
$var_ext = 20;
// Did we compress? No, then use data as is
if ($c_len >= $unc_len)
{
$zdata = $data;
$c_len = $unc_len;
$var_ext = 10;
}
}
unset($data);
@ -309,11 +306,9 @@ class compress_zip extends compress
// Are we a file or a directory? Set archive for file
$attrib = ($is_dir) ? 16 : 32;
$var_ext = ($is_dir) ? "\x0a" : "\x14";
// File Record Header
$fr = "\x50\x4b\x03\x04"; // Local file header 4bytes
$fr .= "$var_ext\x00"; // ver needed to extract 2bytes
$fr .= pack('v', $var_ext); // ver needed to extract 2bytes
$fr .= "\x00\x00"; // gen purpose bit flag 2bytes
$fr .= $c_method; // compression method 2bytes
$fr .= $hexdtime; // last mod time and date 2+2bytes
@ -336,7 +331,7 @@ class compress_zip extends compress
// Central Directory Header
$cdrec = "\x50\x4b\x01\x02"; // header 4bytes
$cdrec .= "\x00\x00"; // version made by
$cdrec .= "$var_ext\x00"; // version needed to extract
$cdrec .= pack('v', $var_ext); // version needed to extract
$cdrec .= "\x00\x00"; // gen purpose bit flag
$cdrec .= $c_method; // compression method
$cdrec .= $hexdtime; // last mod time & date