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DataEncoder.php
170 lines
| 1 | <?php |
| 2 | |
| 3 | namespace WPStaging\Framework\Utils; |
| 4 | |
| 5 | use InvalidArgumentException; |
| 6 | |
| 7 | /** |
| 8 | * The class is responsible for converting data to/from binary and/or hex format |
| 9 | * It uses pack, unpack and bin2hex functions internally |
| 10 | */ |
| 11 | class DataEncoder |
| 12 | { |
| 13 | /** |
| 14 | * The pack mode for 64-bit integer |
| 15 | * P -> Big Endianness |
| 16 | * @var string |
| 17 | */ |
| 18 | const PACK_MODE = 'P'; |
| 19 | |
| 20 | /** |
| 21 | * @param string $format |
| 22 | * @param int[] $intArray |
| 23 | * @return string |
| 24 | */ |
| 25 | public function intArrayToHex(string $format, array $intArray): string |
| 26 | { |
| 27 | if (empty($format)) { |
| 28 | throw new InvalidArgumentException('Format cannot be empty'); |
| 29 | } |
| 30 | |
| 31 | if (empty($intArray)) { |
| 32 | throw new InvalidArgumentException('Int array cannot be empty'); |
| 33 | } |
| 34 | |
| 35 | $formats = str_split($format); |
| 36 | if (count($formats) !== count($intArray)) { |
| 37 | throw new InvalidArgumentException('The number of characters in formats and integers in array must be equal'); |
| 38 | } |
| 39 | |
| 40 | if (preg_match('/[^1-8]/', $format)) { |
| 41 | throw new InvalidArgumentException('Invalid format'); |
| 42 | } |
| 43 | |
| 44 | $index = 0; |
| 45 | $result = ''; |
| 46 | foreach ($formats as $format) { |
| 47 | // let try catch to re throw for index position |
| 48 | try { |
| 49 | $bytes = intval($format); |
| 50 | if (!is_int($bytes)) { |
| 51 | throw new InvalidArgumentException('Invalid format'); |
| 52 | } |
| 53 | |
| 54 | $result .= $this->intToHex($intArray[$index], $bytes); |
| 55 | } catch (InvalidArgumentException $ex) { |
| 56 | throw new InvalidArgumentException($ex->getMessage() . ' at index ' . $index); |
| 57 | } |
| 58 | |
| 59 | $index++; |
| 60 | } |
| 61 | |
| 62 | return $result; |
| 63 | } |
| 64 | |
| 65 | public function intToHex(int $value, int $bytes = 8): string |
| 66 | { |
| 67 | if ($value < 0) { |
| 68 | throw new InvalidArgumentException('Invalid value'); |
| 69 | } |
| 70 | |
| 71 | if ($bytes < 1 || $bytes > 8) { |
| 72 | throw new InvalidArgumentException('Invalid number of bytes'); |
| 73 | } |
| 74 | |
| 75 | // convert bytes to int |
| 76 | $maxInt = (2 ** ($bytes * 8)) - 1; |
| 77 | if ($value > $maxInt) { |
| 78 | throw new InvalidArgumentException('Value is too large for the given number of bytes'); |
| 79 | } |
| 80 | |
| 81 | $pack = pack(self::PACK_MODE, $value); |
| 82 | return bin2hex(substr($pack, 0, $bytes)); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * @param string $format |
| 87 | * @param string $hex |
| 88 | * |
| 89 | * @throws InvalidArgumentException |
| 90 | * @return int[] |
| 91 | */ |
| 92 | public function hexToIntArray(string $format, string $hex): array |
| 93 | { |
| 94 | if (empty($format)) { |
| 95 | throw new InvalidArgumentException('Format cannot be empty'); |
| 96 | } |
| 97 | |
| 98 | if (preg_match('/[^1-8]/', $format)) { |
| 99 | throw new InvalidArgumentException('Invalid format'); |
| 100 | } |
| 101 | |
| 102 | if (empty($hex)) { |
| 103 | throw new InvalidArgumentException('Hex string cannot be empty'); |
| 104 | } |
| 105 | |
| 106 | if (strlen($hex) % 2 !== 0) { |
| 107 | throw new InvalidArgumentException('Invalid hex string'); |
| 108 | } |
| 109 | |
| 110 | // check for invalid characters in hex |
| 111 | if (preg_match('/[^0-9a-fA-F]/', $hex)) { |
| 112 | throw new InvalidArgumentException('Invalid hex string'); |
| 113 | } |
| 114 | |
| 115 | $formats = str_split($format); |
| 116 | $index = 0; |
| 117 | $intArray = []; |
| 118 | foreach ($formats as $format) { |
| 119 | $bytes = intval($format); |
| 120 | $length = $bytes * 2; |
| 121 | |
| 122 | if ($index + $length > strlen($hex)) { |
| 123 | throw new InvalidArgumentException('Hex string is short according to format'); |
| 124 | } |
| 125 | |
| 126 | $subHex = substr($hex, $index, $length); |
| 127 | |
| 128 | $intArray[] = $this->hexToInt($subHex, $bytes); |
| 129 | $index += $length; |
| 130 | } |
| 131 | |
| 132 | if ($index !== strlen($hex)) { |
| 133 | throw new InvalidArgumentException('Hex string is long according to format'); |
| 134 | } |
| 135 | |
| 136 | return $intArray; |
| 137 | } |
| 138 | |
| 139 | public function hexToInt(string $hex, int $bytes = 8): int |
| 140 | { |
| 141 | if ($bytes < 1 || $bytes > 8) { |
| 142 | throw new InvalidArgumentException('Invalid number of bytes'); |
| 143 | } |
| 144 | |
| 145 | if (empty($hex)) { |
| 146 | throw new InvalidArgumentException('Hex string cannot be empty'); |
| 147 | } |
| 148 | |
| 149 | if (strlen($hex) / 2 > $bytes) { |
| 150 | throw new InvalidArgumentException('Hex string is longer than the given number of bytes'); |
| 151 | } |
| 152 | |
| 153 | if (strlen($hex) % 2 !== 0) { |
| 154 | throw new InvalidArgumentException('Invalid hex string'); |
| 155 | } |
| 156 | |
| 157 | // check for invalid characters in hex |
| 158 | if (preg_match('/[^0-9a-fA-F]/', $hex)) { |
| 159 | throw new InvalidArgumentException('Invalid hex string'); |
| 160 | } |
| 161 | |
| 162 | $binary = hex2bin($hex); |
| 163 | if ($bytes !== 8) { |
| 164 | $binary = str_pad($binary, 8, "\x00", STR_PAD_RIGHT); |
| 165 | } |
| 166 | |
| 167 | return unpack(self::PACK_MODE, $binary)[1]; |
| 168 | } |
| 169 | } |
| 170 |