Decoder.php
2 years ago
InvalidDatabaseException.php
2 years ago
Metadata.php
2 years ago
Util.php
2 years ago
Util.php
30 lines
| 1 | <?php |
| 2 | |
| 3 | declare (strict_types=1); |
| 4 | namespace IAWPSCOPED\MaxMind\Db\Reader; |
| 5 | |
| 6 | /** @internal */ |
| 7 | class Util |
| 8 | { |
| 9 | /** |
| 10 | * @param resource $stream |
| 11 | * @param int<0, max> $numberOfBytes |
| 12 | */ |
| 13 | public static function read($stream, int $offset, int $numberOfBytes) : string |
| 14 | { |
| 15 | if ($numberOfBytes === 0) { |
| 16 | return ''; |
| 17 | } |
| 18 | if (\fseek($stream, $offset) === 0) { |
| 19 | $value = \fread($stream, $numberOfBytes); |
| 20 | // We check that the number of bytes read is equal to the number |
| 21 | // asked for. We use ftell as getting the length of $value is |
| 22 | // much slower. |
| 23 | if ($value !== \false && \ftell($stream) - $offset === $numberOfBytes) { |
| 24 | return $value; |
| 25 | } |
| 26 | } |
| 27 | throw new InvalidDatabaseException('The MaxMind DB file contains bad data'); |
| 28 | } |
| 29 | } |
| 30 |