public function parseFromFile($fp)
{
$header_bin = fread($fp, 8);
$length_read = strlen($header_bin);
if ($length_read == 0) {
L::level(L::DEBUG) && L::log(L::DEBUG, __CLASS__, "Reached EOF; no more to read", array());
return false;
// if we read an exact chunk, it's not an 'eof'.
}
if ($length_read < 8) {
throw new OutOfBoundsException("No more data (read {$length_read} bytes)");
}
if ($header_bin === false) {
throw new RuntimeException("Read error; failed to read 8 bytes of chunk header");
}
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);
throw new RuntimeException("Found chunk claiming to be enormous ({$chunk_size} MiB); are you reading the right file?");
}
$body_bin = fread($fp, $chunk_size);
$chunk = $this->chunk_factory->newChunk($chunk_type, $body_bin);
L::level(L::DEBUG) && L::log(L::DEBUG, __CLASS__, "Read %s chunk from file", array($chunk_type));
return $chunk;
}
public function parseFromFile($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;
}
