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<?php
# Movable Type (r) Open Source (C) 2001-2012 Six Apart, Ltd.
# This program is distributed under the terms of the
# GNU General Public License, version 2.
#
# $Id$
global $SERIALIZE_VERSION;
$SERIALIZE_VERSION = 2;
class MTSerialize {
function unserialize($frozen) {
return $this->_thaw_mt_2($frozen);
}
function serialize($data) {
return $this->_freeze_mt_2($data);
}
function _freeze_mt_2($ref) {
# version 2 signature: 'SERG' + packed long 0 + packed long protocol
$freezer = create_function('$i, $v, $f', '
if (is_array($v)) {
$type = perl_array_type($v);
return $i[$type]($i, $v, $f);
} else {
if (!is_null($v)) {
return "-" . pack("N", strlen($v)) . $v;
} else {
return "U";
}
}
');
# The ice tray freezes a single element, yielding a frozen cube
$ice_tray = array(
'HASH' => create_function('$i, $v, $f', '
$cube = "H" . pack("N", count(array_keys($v)));
foreach ($v as $k => $kv)
$cube .= pack("N", strlen($k)) . $k . $f($i, $kv, $f);
return $cube;
'),
'ARRAY' => create_function('$i, $v, $f','
$cube = "A" . pack("N", count($v));
foreach ($v as $k) {
$cube .= $f($i, $k, $f);
}
return $cube;
'),
);
return 'SERG' . pack('N', 0) . pack('N', 2) .
$freezer($ice_tray, $ref, $freezer);
}
function _thaw_mt_2($frozen) {
if (substr($frozen, 0, 4) != 'SERG') {
return NULL;
}
$thawed = NULL;
$refs = array(&$thawed);
# The microwave thaws and pops out an element
$microwave = array(
'H' => create_function('&$s',' # hashref
$keys = unpack("Nlen", substr($s["frozen"], $s["pos"], 4));
$s["pos"] += 4;
$values = array();
$s["refs"][] = $values;
for ($k = 0; $k < $keys["len"]; $k++ ) {
$key_name_len = unpack("Nlen", substr($s["frozen"], $s["pos"], 4));
$key_name = substr($s["frozen"], $s["pos"] + 4, $key_name_len["len"]);
$s["pos"] += 4 + $key_name_len["len"];
if ( strlen($s["frozen"]) >= $s["pos"] + 4 ) {
$h = $s["heater"];
$values[$key_name] = $h($s);
} else {
$values[$key_name] = "";
}
}
return $values;
'),
'A' => create_function('&$s', ' # arrayref
$array_count = unpack("Nlen", substr($s["frozen"], $s["pos"], 4));
$s["pos"] += 4;
$values = array();
$s["refs"][] = &$values;
$h = $s["heater"];
for ($a = 0; $a < $array_count["len"]; $a++) {
$values[] = $h($s);
}
return $values;
'),
'S' => create_function('&$s', ' # scalarref
$slen = unpack("Nlen", substr($s["frozen"], $s["pos"], 4));
$col_val = substr($s["frozen"], $s["pos"]+4, $slen["len"]);
$s["pos"] += 4 + $slen["len"];
$s["refs"][] = &$col_val;
return $col_val;
'),
'R' => create_function('&$s', ' # refref
$value = NULL;
$s["refs"][] = &$value;
$h = $s["heater"];
$value = $h($s);
return $value;
'),
'-' => create_function('&$s', ' # scalar value
$slen = unpack("Nlen", substr($s["frozen"], $s["pos"], 4));
$col_val = substr($s["frozen"], $s["pos"]+4, $slen["len"]);
$s["pos"] += 4 + $slen["len"];
return $col_val;
'),
'U' => create_function('&$s', ' # undef
return NULL;
'),
'P' => create_function('&$s', ' # pointer to known ref
$ptr = unpack("Npos", substr($s["frozen"], $s["pos"], 4));
$s["pos"] += 4;
return $s["refs"][$ptr["pos"]];
')
);
$heater = create_function('&$s', '
$type = substr($s["frozen"], $s["pos"], 1); $s["pos"]++;
if (array_key_exists($type, $s["microwave"])) {
$h = $s["microwave"][$type];
return $h($s);
} else {
return NULL;
}
');
$state = array('pos' => 12, 'heater' => $heater, 'refs' => $refs,
'frozen' => $frozen, 'microwave' => $microwave);
return $heater($state);
}
}
function perl_array_type(&$v) {
$keys = array_keys($v);
foreach ($keys as $i)
if (!is_int($i)) return 'HASH';
return 'ARRAY';
}
?>
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