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<?php

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namespace Wordfence\MmdbReader;

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class ControlByte {

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const TYPE_EXTENDED = 0;

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const TYPE_POINTER = 1;

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const TYPE_UTF8_STRING = 2;

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const TYPE_DOUBLE = 3;

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const TYPE_BYTES = 4;

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const TYPE_UINT16 = 5;

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const TYPE_UINT32 = 6;

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const TYPE_MAP = 7;

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const TYPE_INT32 = 8;

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const TYPE_UINT64 = 9;

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const TYPE_UINT128 = 10;

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const TYPE_ARRAY = 11;

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const TYPE_CONTAINER = 12;

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const TYPE_END_MARKER = 13;

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const TYPE_BOOLEAN = 14;

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const TYPE_FLOAT = 15;

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const EXTENSION_OFFSET = 7;

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const SIZE_MASK = 31;

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const MAX_SINGLE_BYTE_SIZE = 28;

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private $type;

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private $size;

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public function __construct($type, $size) {

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$this->type = $type;

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$this->size = $size;

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}

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public function getType() {

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return $this->type;

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}

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public function getTypeName() {

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return self::mapTypeName($this->getType());

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}

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public function getSize() {

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return $this->size;

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}

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public function is($type) {

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return $this->type === $type;

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}

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public static function consume($handle) {

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$byte = $handle->readByte();

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$type = $byte >> 5;

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if ($type === self::TYPE_EXTENDED)

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$type = $handle->readByte() + self::EXTENSION_OFFSET;

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$size = $byte & self::SIZE_MASK;

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if ($size > self::MAX_SINGLE_BYTE_SIZE) {

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$bytes = $size - self::MAX_SINGLE_BYTE_SIZE;

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switch ($size) {

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case 30:

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$size = 285;

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break;

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case 31:

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$size = 65821;

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break;

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default:

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break;

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}

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$size += IntegerParser::parseUnsigned($handle, $bytes);

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}

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return new self($type, $size);

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}

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public static function mapTypeName($type) {

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switch ($type) {

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case self::TYPE_EXTENDED:

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return 'TYPE_EXTENDED';

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case self::TYPE_POINTER:

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return 'TYPE_POINTER';

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case self::TYPE_UTF8_STRING:

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return 'TYPE_UTF8_STRING';

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case self::TYPE_DOUBLE:

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return 'TYPE_DOUBLE';

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case self::TYPE_BYTES:

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return 'TYPE_BYTES';

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case self::TYPE_UINT16:

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return 'TYPE_UINT16';

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case self::TYPE_UINT32:

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return 'TYPE_UINT32';

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case self::TYPE_MAP:

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return 'TYPE_MAP';

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case self::TYPE_INT32:

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return 'TYPE_INT32';

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case self::TYPE_UINT64:

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return 'TYPE_UINT64';

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case self::TYPE_UINT128:

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return 'TYPE_UINT128';

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case self::TYPE_ARRAY:

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return 'TYPE_ARRAY';

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case self::TYPE_CONTAINER:

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return 'TYPE_CONTAINER';

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case self::TYPE_END_MARKER:

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return 'TYPE_END_MARKER';

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case self::TYPE_BOOLEAN:

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return 'TYPE_BOOLEAN';

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case self::TYPE_FLOAT:

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return 'TYPE_FLOAT';

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default:

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return 'UNKNOWN';

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}

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}

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public function __toString() {

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return sprintf('%s(%d) of size %d', $this->getTypeName(), $this->getType(), $this->getSize());

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}

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}

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