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Merge pull request #193 from TvdW/develop

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Implement POSIX.1-1988 UStar directly instead of calling the tar binary
This commit is contained in:
Lars Jung 2013-07-18 06:48:14 -07:00
commit 040919808c
1 changed files with 69 additions and 2 deletions
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71
src/_h5ai/server/php/inc/Archive.php
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@ -57,7 +57,7 @@ class Archive {
try {
if ($format === "tar") {
$cmd = Archive::$TAR_PASSTHRU_CMD;
return $this->create_tar();
} else if ($format === "zip") {
$cmd = Archive::$ZIP_PASSTHRU_CMD;
} else {
@ -77,6 +77,73 @@ class Archive {
}
private function create_tar() {
// POSIX.1-1988 UStar implementation, by @TvdW
$root_path = $this->app->get_root_abs_path();
// Build a list of filesizes so we can predict the total size
$filesizes = array();
$total_size = 0;
foreach (array_values($this->files) as $file) {
if (substr($file, 0, strlen($root_path)) != $root_path) {
$file = $this->app->get_abs_path().'/'.$file;
}
if (!file_exists($file)) continue;
$size = filesize($file);
$filesizes[$file] = $size;
$total_size += 512 + $size;
if ($size % 512 != 0) $total_size += 512 - ($size % 512);
}
header('Content-Length: '.$total_size);
foreach (array_keys($filesizes) as $file) {
// TAR supports filenames up to 253 chars, but the name should be split ubti a 154-byte prefix and 99-byte name
$local_filename = normalize_path(substr($file, strlen($root_path) + 1));
$filename_parts = array('', substr($local_filename, -99));
if (strlen($local_filename) > 99) $filename_parts[0] = substr($local_filename, 0, -99);
if (strlen($filename_parts[0]) > 154) $filename_parts[0] = substr($filename_parts[0], -154);
$size = $filesizes[$file];
$file_header =
str_pad($filename_parts[1], 100, "\0") // first filename part
."0000755\0"."0000000\0"."0000000\0" // File mode and uid/gid
.str_pad(decoct($size), 11, "0", STR_PAD_LEFT)."\0" // File size
.str_pad(decoct(time()), 11, "0", STR_PAD_LEFT)."\0" // Modification time
." " // checksum (filled in later)
."0" // file type
.str_repeat("\0", 100)
."ustar 00"
.str_repeat("\0", 92)
.str_pad($filename_parts[0], 155, "\0");
assert(strlen($file_header) == 512);
// Checksum
$checksum = array_sum(array_map('ord', str_split($file_header)));
$checksum = str_pad(decoct($checksum), 6, "0", STR_PAD_LEFT)."\0 ";
$file_header = substr_replace($file_header, $checksum, 148, 8);
echo $file_header;
readfile($file);
$pad_file = 512 - ($size % 512);
if ($pad_file) echo str_repeat("\0", $pad_file);
}
return 0;
}
private function add_hrefs($hrefs) {
foreach ($hrefs as $href) {
@ -132,4 +199,4 @@ class Archive {
}
}
?>
?>