<?php
namespace MaxMind\Db\Reader;
class Util
{
public static function read($stream, $offset, $numberOfBytes)
{
if ($numberOfBytes === 0) {
return '';
}
if (fseek($stream, $offset) === 0) {
$value = fread($stream, $numberOfBytes);
// We check that the number of bytes read is equal to the number
// asked for. We use ftell as getting the length of $value is
// much slower.
if (ftell($stream) - $offset === $numberOfBytes) {
return $value;
}
}
throw new InvalidDatabaseException(
'The MaxMind DB file contains bad data'
);
}
}