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Refactors php_tar. Fixes tar file header, now supports long paths. Adds support for emtpy dirs. Ignores empty files (failed).
This commit is contained in:
Lars Jung
parent
02dd104223
commit
74f1c0a986
2 changed files with 104 additions and 57 deletions
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@ -111,6 +111,7 @@ class Api {
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$hrefs = explode("|:|", trim($hrefs));
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$hrefs = explode("|:|", trim($hrefs));
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set_time_limit(0);
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header("Content-Type: application/octet-stream");
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header("Content-Type: application/octet-stream");
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header("Content-Disposition: attachment; filename=\"$as\"");
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header("Content-Disposition: attachment; filename=\"$as\"");
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header("Connection: close");
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header("Connection: close");
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@ -28,7 +28,7 @@ class Archive {
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if ($type === "php-tar") {
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if ($type === "php-tar") {
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return $this->php_tar();
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return $this->php_tar($this->dirs, $this->files);
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} else if ($type === "shell-tar") {
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} else if ($type === "shell-tar") {
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@ -56,82 +56,128 @@ class Archive {
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}
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}
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private function php_tar() {
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private function php_tar($dirs, $files) {
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// POSIX.1-1988 UStar implementation, by @TvdW
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set_time_limit(0);
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$root_path = $this->app->get_abs_path();
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// Build a list of filesizes so we can predict the total size
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$filesizes = array();
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$filesizes = array();
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$total_size = 0;
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$total_size = 0;
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foreach (array_values($this->files) as $file) {
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foreach (array_keys($files) as $real_file) {
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if (substr($file, 0, strlen($root_path)) != $root_path) {
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$size = filesize($real_file);
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$file = $this->app->get_abs_path().'/'.$file;
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}
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if (!file_exists($file)) continue;
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$size = filesize($file);
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$filesizes[$file] = $size;
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$filesizes[$real_file] = $size;
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$total_size += 512 + $size;
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$total_size += 512 + $size;
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if ($size % 512 != 0) $total_size += 512 - ($size % 512);
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if ($size % 512 != 0) {
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$total_size += 512 - ($size % 512);
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}
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}
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}
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header('Content-Length: '.$total_size);
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header("Content-Length: " . $total_size);
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foreach (array_keys($filesizes) as $file) {
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foreach ($dirs as $archived_dir) {
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// TAR supports filenames up to 253 chars, but the name should be split ubti a 154-byte prefix and 99-byte name
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echo $this->php_tar_dirheader($archived_dir);
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$local_filename = normalize_path(substr($file, strlen($root_path) + 1));
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}
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$filename_parts = array('', substr($local_filename, -99));
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foreach ($files as $real_file => $archived_file) {
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if (strlen($local_filename) > 99) $filename_parts[0] = substr($local_filename, 0, -99);
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if (strlen($filename_parts[0]) > 154) $filename_parts[0] = substr($filename_parts[0], -154);
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$size = $filesizes[$file];
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if ($filesizes[$real_file] === 0) {
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continue;
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$file_header =
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str_pad($filename_parts[1], 100, "\0") // first filename part
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."0000755\0"."0000000\0"."0000000\0" // File mode and uid/gid
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.str_pad(decoct($size), 11, "0", STR_PAD_LEFT)."\0" // File size
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.str_pad(decoct(time()), 11, "0", STR_PAD_LEFT)."\0" // Modification time
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." " // checksum (filled in later)
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."0" // file type
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.str_repeat("\0", 100)
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."ustar 00"
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.str_repeat("\0", 92)
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.str_pad($filename_parts[0], 155, "\0");
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assert(strlen($file_header) == 512);
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// Checksum
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$checksum = array_sum(array_map('ord', str_split($file_header)));
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$checksum = str_pad(decoct($checksum), 6, "0", STR_PAD_LEFT)."\0 ";
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$file_header = substr_replace($file_header, $checksum, 148, 8);
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echo $file_header;
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// Send file content in segments to not hit PHP's memory limit (default: 128M)
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if ($fd = fopen($file, 'rb')) {
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while (!feof($fd)) {
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print fread($fd, Archive::$SEGMENT_SIZE);
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ob_flush();
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flush();
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}
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fclose($fd);
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}
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}
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$pad_file = 512 - ($size % 512);
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echo $this->php_tar_fileheader($real_file, $archived_file);
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if ($pad_file) echo str_repeat("\0", $pad_file);
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$this->print_file($real_file);
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$pad_file = 512 - ($filesizes[$real_file] % 512);
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if ($pad_file) {
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echo str_repeat("\0", $pad_file);
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}
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}
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}
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return 0;
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return 0;
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}
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}
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private function php_tar_dirheader($archived_dir) {
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$name = substr(basename($archived_dir), -99);
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$prefix = substr(normalize_path(dirname($archived_dir)), -154);
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if ($prefix === '.') {
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$prefix = '';
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}
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$dir_header =
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str_pad($name, 100, "\0") // filename [100]
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. "0000755\0" // file mode [8]
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. "0000000\0" // uid [8]
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. "0000000\0" // gid [8]
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. "00000000000\0" // file size [12]
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. "00000000000\0" // file modification time [12]
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. " " // checksum [8]
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. "5" // file type [1]
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. str_repeat("\0", 100) // linkname [100]
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. "ustar\0" // magic [6]
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. "00" // version [2]
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. str_repeat("\0", 80) // uname, gname, defmajor, devminor [32 + 32 + 8 + 8] ?92?
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. str_pad($prefix, 155, "\0") // filename [155]
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. str_repeat("\0", 12); // fill [12]
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assert(strlen($dir_header) === 512);
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// checksum
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$checksum = array_sum(array_map('ord', str_split($dir_header)));
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$checksum = str_pad(decoct($checksum), 6, "0", STR_PAD_LEFT) . "\0 ";
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$dir_header = substr_replace($dir_header, $checksum, 148, 8);
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return $dir_header;
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}
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private function php_tar_fileheader($real_file, $archived_file) {
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$name = substr(basename($archived_file), -99);
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$prefix = substr(normalize_path(dirname($archived_file)), -154);
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if ($prefix === '.') {
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$prefix = '';
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}
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$file_header =
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str_pad($name, 100, "\0") // filename [100]
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. "0000755\0" // file mode [8]
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. "0000000\0" // uid [8]
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. "0000000\0" // gid [8]
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. str_pad(decoct(@filesize($real_file)), 11, "0", STR_PAD_LEFT) . "\0" // file size [12]
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. str_pad(decoct(@filemtime($real_file)), 11, "0", STR_PAD_LEFT) . "\0" // file modification time [12]
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. " " // checksum [8]
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. "0" // file type [1]
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. str_repeat("\0", 100) // linkname [100]
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. "ustar\0" // magic [6]
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. "00" // version [2]
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. str_repeat("\0", 80) // uname, gname, defmajor, devminor [32 + 32 + 8 + 8] ?92?
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. str_pad($prefix, 155, "\0") // filename [155]
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. str_repeat("\0", 12); // fill [12]
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assert(strlen($file_header) === 512);
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// checksum
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$checksum = array_sum(array_map('ord', str_split($file_header)));
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$checksum = str_pad(decoct($checksum), 6, "0", STR_PAD_LEFT) . "\0 ";
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$file_header = substr_replace($file_header, $checksum, 148, 8);
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return $file_header;
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}
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private function print_file($file) {
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// Send file content in segments to not hit PHP's memory limit (default: 128M)
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if ($fd = fopen($file, 'rb')) {
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while (!feof($fd)) {
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print fread($fd, Archive::$SEGMENT_SIZE);
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ob_flush();
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flush();
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}
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fclose($fd);
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}
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}
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private function add_hrefs($hrefs) {
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private function add_hrefs($hrefs) {
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foreach ($hrefs as $href) {
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foreach ($hrefs as $href) {
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