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<?php
class MessageBundle {
/* private */ var $resource;
/* private */ var $size;
/* private */ var $buffer = array();
/* private */ var $useBuffer;
/* public */ function MessageBundle($file, $useBuffer=true) {
$this->resource = fopen($file, 'rb');
fseek($this->resource, 3);
$this->size = array_shift(unpack("N", fread($this->resource, 4)));
$this->useBuffer = $useBuffer;
}
/* public */ function close() {
fclose($this->resource);
unset($this->resource);
}
/* public */ function setDefault($messages) {
static $default = null;
return $messages === null? $default : $default = $messages;
}
/* public */ function getDefault() {
return MessageBundle::setDefault(null);
}
/* public */ function useBuffer($b) {
$this->useBuffer = (bool)$b;
}
/* public */ function get($key, $ret=true) {
if (!is_resource($this->resource)) return $key;
if (isset($this->buffer[$key])) return $this->buffer[$key];
$spacer = chr(0);
$len = strlen($key);
$hash = MessageBundle::hash($key, $this->size);
for ($i=0; true; $hash = ($hash + (1 << $i++)) % $this->size) {
fseek($this->resource, 7 + ($hash << 3));
$info = unpack("Npos/nkl/nvl", fread($this->resource, 8));
$pos = $info['pos']; $kl = $info['kl']; $vl = $info['vl'];
if ($pos === 0) return $ret ? $key : null;
if ($kl !== strlen($key)) { continue; }
fseek($this->resource, $pos);
$info = fread($this->resource, $kl+$vl);
if (substr($info, 0, $kl) !== $key) continue;
$v = substr($info, $kl, $vl);
if ($this->useBuffer) $this->buffer[$key] = $v;
return $v;
}
}
/* public */ function getBundle($file, $msgfile=null) {
if ($msgfile === null) $msgfile = $file.'.msg';
if (!is_file($file) || !is_readable($file)) return null;
if (!is_file($msgfile) && !touch($msgfile) && ((!is_readable($msgfile) && !is_writable($msgfile)) || !chmod(0666, $msgfile))) return null;
MessageBundle::build($file, $msgfile);
return new MessageBundle($msgfile);
}
/* private */ function hash($str, $size) {
$h = 0;
for ($i=0, $l=strlen($str); $i<$l; ++$i) {
$h = (($h << 6) + ord($str{$i})) % $size;
}
return $h;
}
/* private */ function isBuildNeeded($file, $dest) {
return !is_file($dest) || filemtime($file) > filemtime($dest) || filesize($dest) === 0;
}
/* private */ function build($file, $dest) {
if (!MessageBundle::isBuildNeeded($file, $dest)) return false;
$resource = fopen($dest, 'wb');
$lines = file($file);
$max = MessageBundle::nextPrime(count($lines) << 1);
$data = array();
$pointer = 7 + ($max << 3);
fwrite($resource, 'msg'.pack('N', $max));
$c = 0;
foreach($lines as $line) {
$pos = strpos($line, '=');
if ($pos === false) continue;
$key = trim(substr($line, 0, $pos));
$value = trim(substr($line, $pos+1));
$hash = MessageBundle::hash($key, $max);
for ($i=0; array_key_exists($hash, $data); ++$i, ++$c) $hash = ($hash + (1 << $i)) % $max;
$data[$hash] = true;
fseek($resource, 7 + ($hash << 3));
fwrite($resource, pack('Nnn', $pointer, strlen($key), strlen($value)));
fseek($resource, $pointer);
fwrite($resource, $key.$value);
$pointer += strlen($key) + strlen($value);
}
fclose($resource);
return true;
}
function isPrime($num) {
if ($num % 2 == 0) return false;
for ($i=3, $sqrt = (int)sqrt($num); $i<=$sqrt; $i+=2) {
if ($num % $i == 0) return false;
}
return true;
}
function nextPrime($num) {
if ($num % 2 == 0) ++$num;
while (!MessageBundle::isPrime($num)) $num+=2;
return $num;
}
}
?>