mlocati /
ip-lib
| @@ 408-432 (lines=25) @@ | ||
| 405 | * |
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| 406 | * @see \IPLib\Address\AddressInterface::getAddressAtOffset() |
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| 407 | */ |
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| 408 | public function getAddressAtOffset($n) |
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| 409 | { |
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| 410 | if (!is_int($n)) { |
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| 411 | return null; |
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| 412 | } |
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| 413 | ||
| 414 | $boundary = 256; |
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| 415 | $mod = $n; |
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| 416 | $bytes = $this->getBytes(); |
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| 417 | for ($i = count($bytes) - 1; $i >= 0; $i--) { |
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| 418 | $tmp = ($bytes[$i] + $mod) % $boundary; |
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| 419 | $mod = (int) floor(($bytes[$i] + $mod) / $boundary); |
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| 420 | if ($tmp < 0) { |
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| 421 | $tmp += $boundary; |
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| 422 | } |
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| 423 | ||
| 424 | $bytes[$i] = $tmp; |
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| 425 | } |
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| 426 | ||
| 427 | if ($mod !== 0) { |
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| 428 | return null; |
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| 429 | } |
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| 430 | ||
| 431 | return static::fromBytes($bytes); |
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| 432 | } |
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| 433 | ||
| 434 | /** |
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| 435 | * {@inheritdoc} |
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| @@ 511-535 (lines=25) @@ | ||
| 508 | * |
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| 509 | * @see \IPLib\Address\AddressInterface::getAddressAtOffset() |
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| 510 | */ |
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| 511 | public function getAddressAtOffset($n) |
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| 512 | { |
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| 513 | if (!is_int($n)) { |
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| 514 | return null; |
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| 515 | } |
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| 516 | ||
| 517 | $boundary = 0x10000; |
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| 518 | $mod = $n; |
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| 519 | $words = $this->getWords(); |
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| 520 | for ($i = count($words) - 1; $i >= 0; $i--) { |
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| 521 | $tmp = ($words[$i] + $mod) % $boundary; |
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| 522 | $mod = (int) floor(($words[$i] + $mod) / $boundary); |
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| 523 | if ($tmp < 0) { |
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| 524 | $tmp += $boundary; |
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| 525 | } |
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| 526 | ||
| 527 | $words[$i] = $tmp; |
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| 528 | } |
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| 529 | ||
| 530 | if ($mod !== 0) { |
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| 531 | return null; |
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| 532 | } |
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| 533 | ||
| 534 | return static::fromWords($words); |
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| 535 | } |
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| 536 | ||
| 537 | /** |
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| 538 | * {@inheritdoc} |
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