/**
* Read the file header and lumps.
*
* @throws \Exception
*/
private function readHeader()
{
// size = 4 (header) + 4 (version) + (64 * 32)
$this->buffer = new ResourceBuffer($this->stream);
$header = $this->buffer->read(4);
if ($header != 'VBSP') {
throw new BSPException('Invalid header!');
}
$this->version = $this->buffer->getInteger();
$this->lumpHeader = [];
for ($i = 0; $i < 64; $i++) {
$this->lumpHeader[] = ['fileofs' => $this->buffer->getInteger(), 'filelen' => $this->buffer->getInteger(), 'version' => $this->buffer->getInteger(), 'fourCC' => $this->buffer->read(4)];
}
}
/**
* Load the archive.
*
* @throws VPKException
* @throws \Exception
* @throws \VLib\Buffer\BufferUnderflowException
*/
private function load()
{
$this->multiChunk = strpos($this->path, '_dir') !== false;
// Load it from our filesystem. This uses Flysystem to support remote files.
$fh = $this->filesystem->readStream($this->path);
if (!$fh) {
throw new VPKException('Unable to open path ' . $this->path);
}
/**
* Use a temporary buffer for the header data.
*/
$buffer = new ResourceBuffer($fh);
$sig = $buffer->getInteger();
if ($sig !== 1437209140) {
throw new VPKException('Invalid file signature.');
}
$this->version = $buffer->getInteger();
switch ($this->version) {
case 1:
$headerSize = 12;
break;
case 2:
$headerSize = 28;
$buffer->skip(16);
break;
default:
throw new VPKException('Invalid file version.');
}
$this->dictSize = $buffer->getInteger();
$this->pathEntries = [];
while ($type = $buffer->getString()) {
while ($dir = $buffer->getString()) {
while ($name = $buffer->getString()) {
$crc32 = $buffer->getInteger();
$preloadSize = $buffer->getShort();
$chunkIndex = $buffer->getShort();
$offset = $buffer->getInteger();
$size = $buffer->getInteger();
$term = $buffer->getShort();
if ($term !== 0xffff) {
throw new VPKException('Unexpected termination character.');
}
$preload = '';
if ($preloadSize > 0) {
$preload = $buffer->read($preloadSize);
}
if ($this->multiChunk) {
$entryName = sprintf('%s_%03d.vpk', $this->vpkName, $chunkIndex);
$entryName = $this->dir . '/' . $entryName;
} else {
$entryName = $this->file;
if ($this->version == 1) {
$offset += $headerSize + $this->dictSize;
}
}
$entry = new VPKEntry($this->filesystem, $entryName);
$entry->setType($type);
$entry->setName($name);
$entry->setDir($dir);
$entry->setCRC32($crc32);
$entry->setOffset($offset);
$entry->setSize($size);
$entry->setPreload($preload);
$this->pathEntries[$entry->getPath()] = $entry;
}
}
}
}