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Direktori : /home2/selectio/www/limpiar.in.net/vendor/bacon/bacon-qr-code/src/Common/ |
Current File : /home2/selectio/www/limpiar.in.net/vendor/bacon/bacon-qr-code/src/Common/FormatInformation.php |
<?php /** * BaconQrCode * * @link http://github.com/Bacon/BaconQrCode For the canonical source repository * @copyright 2013 Ben 'DASPRiD' Scholzen * @license http://opensource.org/licenses/BSD-2-Clause Simplified BSD License */ namespace BaconQrCode\Common; /** * Encapsulates a QR Code's format information, including the data mask used and error correction level. */ class FormatInformation { /** * Mask for format information. */ private const FORMAT_INFO_MASK_QR = 0x5412; /** * Lookup table for decoding format information. * * See ISO 18004:2006, Annex C, Table C.1 */ private const FORMAT_INFO_DECODE_LOOKUP = [ [0x5412, 0x00], [0x5125, 0x01], [0x5e7c, 0x02], [0x5b4b, 0x03], [0x45f9, 0x04], [0x40ce, 0x05], [0x4f97, 0x06], [0x4aa0, 0x07], [0x77c4, 0x08], [0x72f3, 0x09], [0x7daa, 0x0a], [0x789d, 0x0b], [0x662f, 0x0c], [0x6318, 0x0d], [0x6c41, 0x0e], [0x6976, 0x0f], [0x1689, 0x10], [0x13be, 0x11], [0x1ce7, 0x12], [0x19d0, 0x13], [0x0762, 0x14], [0x0255, 0x15], [0x0d0c, 0x16], [0x083b, 0x17], [0x355f, 0x18], [0x3068, 0x19], [0x3f31, 0x1a], [0x3a06, 0x1b], [0x24b4, 0x1c], [0x2183, 0x1d], [0x2eda, 0x1e], [0x2bed, 0x1f], ]; /** * Offset i holds the number of 1 bits in the binary representation of i. * * @var int[] */ private const BITS_SET_IN_HALF_BYTE = [0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4]; /** * Error correction level. * * @var ErrorCorrectionLevel */ private $ecLevel; /** * Data mask. * * @var int */ private $dataMask; protected function __construct(int $formatInfo) { $this->ecLevel = ErrorCorrectionLevel::forBits(($formatInfo >> 3) & 0x3); $this->dataMask = $formatInfo & 0x7; } /** * Checks how many bits are different between two integers. */ public static function numBitsDiffering(int $a, int $b) : int { $a ^= $b; return ( self::BITS_SET_IN_HALF_BYTE[$a & 0xf] + self::BITS_SET_IN_HALF_BYTE[(BitUtils::unsignedRightShift($a, 4) & 0xf)] + self::BITS_SET_IN_HALF_BYTE[(BitUtils::unsignedRightShift($a, 8) & 0xf)] + self::BITS_SET_IN_HALF_BYTE[(BitUtils::unsignedRightShift($a, 12) & 0xf)] + self::BITS_SET_IN_HALF_BYTE[(BitUtils::unsignedRightShift($a, 16) & 0xf)] + self::BITS_SET_IN_HALF_BYTE[(BitUtils::unsignedRightShift($a, 20) & 0xf)] + self::BITS_SET_IN_HALF_BYTE[(BitUtils::unsignedRightShift($a, 24) & 0xf)] + self::BITS_SET_IN_HALF_BYTE[(BitUtils::unsignedRightShift($a, 28) & 0xf)] ); } /** * Decodes format information. */ public static function decodeFormatInformation(int $maskedFormatInfo1, int $maskedFormatInfo2) : ?self { $formatInfo = self::doDecodeFormatInformation($maskedFormatInfo1, $maskedFormatInfo2); if (null !== $formatInfo) { return $formatInfo; } // Should return null, but, some QR codes apparently do not mask this info. Try again by actually masking the // pattern first. return self::doDecodeFormatInformation( $maskedFormatInfo1 ^ self::FORMAT_INFO_MASK_QR, $maskedFormatInfo2 ^ self::FORMAT_INFO_MASK_QR ); } /** * Internal method for decoding format information. */ private static function doDecodeFormatInformation(int $maskedFormatInfo1, int $maskedFormatInfo2) : ?self { $bestDifference = PHP_INT_MAX; $bestFormatInfo = 0; foreach (self::FORMAT_INFO_DECODE_LOOKUP as $decodeInfo) { $targetInfo = $decodeInfo[0]; if ($targetInfo === $maskedFormatInfo1 || $targetInfo === $maskedFormatInfo2) { // Found an exact match return new self($decodeInfo[1]); } $bitsDifference = self::numBitsDiffering($maskedFormatInfo1, $targetInfo); if ($bitsDifference < $bestDifference) { $bestFormatInfo = $decodeInfo[1]; $bestDifference = $bitsDifference; } if ($maskedFormatInfo1 !== $maskedFormatInfo2) { // Also try the other option $bitsDifference = self::numBitsDiffering($maskedFormatInfo2, $targetInfo); if ($bitsDifference < $bestDifference) { $bestFormatInfo = $decodeInfo[1]; $bestDifference = $bitsDifference; } } } // Hamming distance of the 32 masked codes is 7, by construction, so <= 3 bits differing means we found a match. if ($bestDifference <= 3) { return new self($bestFormatInfo); } return null; } /** * Returns the error correction level. */ public function getErrorCorrectionLevel() : ErrorCorrectionLevel { return $this->ecLevel; } /** * Returns the data mask. */ public function getDataMask() : int { return $this->dataMask; } /** * Hashes the code of the EC level. */ public function hashCode() : int { return ($this->ecLevel->getBits() << 3) | $this->dataMask; } /** * Verifies if this instance equals another one. */ public function equals(self $other) : bool { return ( $this->ecLevel === $other->ecLevel && $this->dataMask === $other->dataMask ); } }