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<?php |
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/** |
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* This file contains the BinaryReader class. |
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* For more information see the class description below. |
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* |
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* @author Peter Bathory <[email protected]> |
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* @since 2016-02-18 |
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* |
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* This code is open-source and licenced under the Modified BSD License. |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace geoPHP\Adapter; |
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/** |
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* Helper class BinaryReader |
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* |
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* A simple binary reader supporting both byte orders |
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*/ |
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class BinaryReader extends BinaryAdapter |
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{ |
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/** |
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* @var resource file pointer |
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*/ |
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private $buffer; |
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/** |
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* Opens a memory buffer with the given input |
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* |
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* @param string $input |
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*/ |
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public function __construct(string $input) |
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{ |
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$this->open($input); |
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} |
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/** |
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* Opens the memory buffer |
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* |
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* @param string $input |
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* @throws \Exception |
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* @return void |
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*/ |
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public function open(string $input) |
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{ |
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$stream = fopen('php://memory', 'x+'); |
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if ($stream === false) { |
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throw new \Exception("Error. Could not open PHP memory for writing."); |
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} |
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$this->buffer = $stream; |
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fwrite($this->buffer, $input); |
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fseek($this->buffer, 0); |
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} |
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/** |
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* Closes the memory buffer |
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* @return void |
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*/ |
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public function close() |
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{ |
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if (isset($this->buffer) && is_resource($this->buffer)) { |
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fclose($this->buffer); |
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} |
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unset($this->buffer); |
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} |
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/** |
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* @return void |
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*/ |
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public function __destruct() |
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{ |
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$this->close(); |
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} |
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/** |
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* Reads a signed 8-bit integer from the buffer |
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* |
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* @return int|null |
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*/ |
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public function readSInt8() |
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{ |
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$char = fread($this->buffer, 1); |
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$data = !empty($char) ? unpack("c", $char) : []; |
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return !empty($data) ? current($data) : null; |
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} |
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/** |
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* Reads an unsigned 8-bit integer from the buffer |
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* |
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* @return int|null |
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*/ |
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public function readUInt8() |
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{ |
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$char = fread($this->buffer, 1); |
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$data = !empty($char) ? unpack("C", $char) : []; |
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return !empty($data) ? current($data) : null; |
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} |
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/** |
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* Reads an unsigned 32-bit integer from the buffer |
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* |
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* @return int|null |
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*/ |
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public function readUInt32() |
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{ |
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$int32 = fread($this->buffer, 4); |
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$data = !empty($int32) ? unpack($this->isLittleEndian() ? 'V' : 'N', $int32) : []; |
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return !empty($data) ? current($data) : null; |
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} |
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/** |
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* Reads one or more double values from the buffer |
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* @param int $length How many double values to read. Default is 1 |
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* |
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* @return float[] |
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*/ |
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public function readDoubles($length = 1): array |
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{ |
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$bin = fread($this->buffer, $length); |
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$data = !empty($bin) ? ($this->isLittleEndian() ? unpack("d*", $bin) : unpack("d*", strrev($bin))) : []; |
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return is_array($data) ? array_values($data) : []; |
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} |
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/** |
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* Reads an unsigned base-128 varint from the buffer |
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* Ported from https://github.com/cschwarz/wkx/blob/master/lib/binaryreader.js |
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* |
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* @return int |
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*/ |
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public function readUVarInt(): int |
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{ |
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$result = 0; |
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$bytesRead = 0; |
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do { |
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$nextByte = $this->readUInt8(); |
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$result += ($nextByte & 0x7F) << (7 * $bytesRead); |
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++$bytesRead; |
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} while ($nextByte >= 0x80); |
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return $result; |
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} |
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/** |
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* Reads a signed base-128 varint from the buffer |
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* |
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* @return int |
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*/ |
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public function readSVarInt(): int |
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{ |
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return self::zigZagDecode($this->readUVarInt()); |
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} |
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/** |
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* ZigZag decoding maps unsigned integers to signed integers |
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* |
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* @param int $value Encrypted positive integer value |
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* @return int Decoded signed integer |
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*/ |
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public static function zigZagDecode($value): int |
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{ |
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return ($value & 1) === 0 ? $value >> 1 : -($value >> 1) - 1; |
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} |
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} |
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swen100 /
geoPHP
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