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| 1 | <?php declare(strict_types=1); |
| 2 | |
| 3 | /** |
| 4 | * Clansuite Server Query |
| 5 | * |
| 6 | * SPDX-FileCopyrightText: 2003-2025 Jens A. Koch |
| 7 | * SPDX-License-Identifier: MIT |
| 8 | * |
| 9 | * For the full copyright and license information, please view |
| 10 | * the LICENSE file that was distributed with this source code. |
| 11 | */ |
| 12 | |
| 13 | namespace Clansuite\ServerQuery\Util; |
| 14 | |
| 15 | use function ord; |
| 16 | use function strlen; |
| 17 | use function substr; |
| 18 | use function unpack; |
| 19 | |
| 20 | /** |
| 21 | * Utility class for reading binary data from network packets, providing methods to extract various data types. |
| 22 | */ |
| 23 | final class PacketReader |
| 24 | { |
| 25 | private int $pos = 0; |
| 26 | |
| 27 | /** |
| 28 | * Constructor. |
| 29 | */ |
| 30 | public function __construct(private string $buffer) |
| 31 | { |
| 32 | $this->pos = 0; |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * remaining method. |
| 37 | */ |
| 38 | public function remaining(): int |
| 39 | { |
| 40 | return strlen($this->buffer) - $this->pos; |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * pos method. |
| 45 | */ |
| 46 | public function pos(): int |
| 47 | { |
| 48 | return $this->pos; |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * readInt32 method. |
| 53 | */ |
| 54 | public function readInt32(): ?int |
| 55 | { |
| 56 | if ($this->remaining() < 4) { |
| 57 | return null; |
| 58 | } |
| 59 | $data = unpack('l', substr($this->buffer, $this->pos, 4)); |
| 60 | |
| 61 | if ($data === false || !isset($data[1])) { |
| 62 | return null; |
| 63 | } |
| 64 | |
| 65 | $v = (int) $data[1]; |
| 66 | $this->pos += 4; |
| 67 | |
| 68 | return $v; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * readUint32 method. |
| 73 | */ |
| 74 | public function readUint32(): ?int |
| 75 | { |
| 76 | if ($this->remaining() < 4) { |
| 77 | return null; |
| 78 | } |
| 79 | $data = unpack('V', substr($this->buffer, $this->pos, 4)); |
| 80 | |
| 81 | if ($data === false || !isset($data[1])) { |
| 82 | return null; |
| 83 | } |
| 84 | |
| 85 | $v = (int) $data[1]; |
| 86 | $this->pos += 4; |
| 87 | |
| 88 | return $v; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * readUint16 method. |
| 93 | */ |
| 94 | public function readUint16(): ?int |
| 95 | { |
| 96 | if ($this->remaining() < 2) { |
| 97 | return null; |
| 98 | } |
| 99 | $data = unpack('v', substr($this->buffer, $this->pos, 2)); |
| 100 | |
| 101 | if ($data === false || !isset($data[1])) { |
| 102 | return null; |
| 103 | } |
| 104 | |
| 105 | $v = (int) $data[1]; |
| 106 | $this->pos += 2; |
| 107 | |
| 108 | return $v; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * readUint8 method. |
| 113 | */ |
| 114 | public function readUint8(): ?int |
| 115 | { |
| 116 | if ($this->remaining() < 1) { |
| 117 | return null; |
| 118 | } |
| 119 | $v = ord($this->buffer[$this->pos]); |
| 120 | $this->pos++; |
| 121 | |
| 122 | return $v; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * readFloat method. |
| 127 | */ |
| 128 | public function readFloat(): ?float |
| 129 | { |
| 130 | if ($this->remaining() < 4) { |
| 131 | return null; |
| 132 | } |
| 133 | $data = unpack('f', substr($this->buffer, $this->pos, 4)); |
| 134 | |
| 135 | if ($data === false || !isset($data[1])) { |
| 136 | return null; |
| 137 | } |
| 138 | |
| 139 | $v = (float) $data[1]; |
| 140 | $this->pos += 4; |
| 141 | |
| 142 | return $v; |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * readString method. |
| 147 | */ |
| 148 | public function readString(): ?string |
| 149 | { |
| 150 | $start = $this->pos; |
| 151 | |
| 152 | while ($this->pos < strlen($this->buffer) && $this->buffer[$this->pos] !== "\x00") { |
| 153 | $this->pos++; |
| 154 | } |
| 155 | |
| 156 | if ($this->pos >= strlen($this->buffer)) { |
| 157 | return null; |
| 158 | } |
| 159 | $s = substr($this->buffer, $start, $this->pos - $start); |
| 160 | $this->pos++; // skip null |
| 161 | |
| 162 | return $s; |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * rest method. |
| 167 | */ |
| 168 | public function rest(): string |
| 169 | { |
| 170 | $r = substr($this->buffer, $this->pos); |
| 171 | $this->pos = strlen($this->buffer); |
| 172 | |
| 173 | return $r; |
| 174 | } |
| 175 | } |