protected function hexdump($indent = 0)
{
$width = 32;
$out = '';
$rows = ceil(strlen($this->data) / $width);
$hd = new Hexdumper();
for ($i = 0; $i < $rows; $i++) {
$row = substr($this->data, $i * $width, $width);
$out .= $hd->hexdump($row, $indent, $width);
}
return $out;
}
protected function write($datum, array &$context, &$acc, $type, $dest)
{
$output_mode = false;
if ($dest == '_') {
$to = ' -> ACC';
$dest =& $acc;
} elseif ($dest == '!') {
$to = ' -> OUT';
$dest = '';
$output_mode = true;
} else {
$to = ' -> ' . $dest;
$dest =& $context[$dest];
}
switch ($type) {
case 'r':
// raw
$dest = $datum;
break;
case 's':
// string
$dest = (string) $this->unpackstr($datum);
break;
case 'i':
// int
$dest = (int) $this->unpacksint($datum);
break;
case 'u':
// int
$dest = (int) $this->unpackuint($datum);
break;
case 'h':
// hexdump
$hd = new Hexdumper();
$dest = trim($hd->hexdump($datum));
break;
case 't':
// timestamp -> date
$dest = date("Y-m-d H:i:s", (int) $this->unpackuint($datum));
break;
case 'f':
// float
$dest = (double) $this->unpackfloat($datum);
break;
default:
throw new RuntimeException("Unknown type '{$type}'.");
}
if ($output_mode) {
if ($dest === '') {
$this->flushBuffer();
} else {
$this->out_buffer .= $dest;
}
}
// echo "$dest $to\n";
}
public function parseFromFile($fp)
{
// It looks like newer Serato sometimes allocates large chunks of free space in the file at the end.
// This doesn't count as data, so we skip it, using str_pad() to make sure we also skip any run of
// nulls that is shorter than 8 bytes.
do {
$header_bin = fread($fp, 8);
if ($header_bin === false) {
throw new RuntimeException("Read error; failed to read 8 bytes of chunk header");
}
$length_read = strlen($header_bin);
if ($length_read == 0) {
L::level(L::DEBUG) && L::log(L::DEBUG, __CLASS__, "Reached EOF; no more to read", array());
return false;
// if we read an exact chunk, it's not an 'eof'.
}
$just_blank_bytes = str_pad($header_bin, 8, "") == "";
if ($just_blank_bytes) {
L::level(L::WARNING) && L::log(L::WARNING, __CLASS__, "Hit unallocated blank space in file.", array());
// argh. Attempt to resync the stream to the next oent.
// it looks like Serato sometimes has junk after the free space!
if (!$this->resync($fp)) {
// eof.
return false;
}
}
} while ($just_blank_bytes);
if ($length_read < 8) {
throw new OutOfBoundsException("No more data (read {$length_read} bytes)");
}
list($chunk_type, $chunk_size) = $this->parseHeader($header_bin);
if ($chunk_size > 1048576) {
// a chunk larger than 1Mb!?
$chunk_size = number_format($chunk_size / 1024 / 1024, 2);
$dumper = new Hexdumper();
throw new RuntimeException(sprintf("Found chunk claiming to be enormous ({$chunk_size} MiB); are you reading the right file?\n%s", $dumper->hexdump($header_bin)));
}
if ($chunk_size > 0) {
$body_bin = fread($fp, $chunk_size);
$chunk = $this->chunk_factory->newChunk($chunk_type, $body_bin);
L::level(L::DEBUG) && L::log(L::DEBUG, __CLASS__, "Read %s chunk from file (size: %d)", array($chunk_type, $chunk_size));
} else {
$chunk = '';
L::level(L::WARNING) && L::log(L::WARNING, __CLASS__, "Read 0-byte %s chunk from file. This is unusual.", array($chunk_type));
}
return $chunk;
}
