/** * <p>Deduces version information purely from QR Code dimensions.</p> * * @param dimension dimension in modules * @return Version for a QR Code of that dimension * @throws FormatException if dimension is not 1 mod 4 */ public static function getProvisionalVersionForDimension($dimension) { if ($dimension % 4 != 1) { throw FormatException::getFormatInstance(); } try { return self::getVersionForNumber(($dimension - 17) / 4); } catch (InvalidArgumentException $ignored) { throw FormatException::getFormatInstance(); } }
private static function parseECIValue($bits) { $firstByte = $bits->readBits(8); if (($firstByte & 0x80) == 0) { // just one byte return $firstByte & 0x7f; } if (($firstByte & 0xc0) == 0x80) { // two bytes $secondByte = $bits->readBits(8); return ($firstByte & 0x3f) << 8 | $secondByte; } if (($firstByte & 0xe0) == 0xc0) { // three bytes $secondThirdBytes = $bits->readBits(16); return ($firstByte & 0x1f) << 16 | $secondThirdBytes; } throw FormatException::getFormatInstance(); }
/** * <p>Reads the bits in the {@link BitMatrix} representing the finder pattern in the * correct order in order to reconstruct the codewords bytes contained within the * QR Code.</p> * * @return bytes encoded within the QR Code * @throws FormatException if the exact number of bytes expected is not read */ function readCodewords() { $formatInfo = $this->readFormatInformation(); $version = $this->readVersion(); // Get the data mask for the format used in this QR Code. This will exclude // some bits from reading as we wind through the bit matrix. $dataMask = DataMask::forReference($formatInfo->getDataMask()); $dimension = $this->bitMatrix->getHeight(); $dataMask->unmaskBitMatrix($this->bitMatrix, $dimension); $functionPattern = $version->buildFunctionPattern(); $readingUp = true; if ($version->getTotalCodewords()) { $result = fill_array(0, $version->getTotalCodewords(), 0); } else { $result = array(); } $resultOffset = 0; $currentByte = 0; $bitsRead = 0; // Read columns in pairs, from right to left for ($j = $dimension - 1; $j > 0; $j -= 2) { if ($j == 6) { // Skip whole column with vertical alignment pattern; // saves time and makes the other code proceed more cleanly $j--; } // Read alternatingly from bottom to top then top to bottom for ($count = 0; $count < $dimension; $count++) { $i = $readingUp ? $dimension - 1 - $count : $count; for ($col = 0; $col < 2; $col++) { // Ignore bits covered by the function pattern if (!$functionPattern->get($j - $col, $i)) { // Read a bit $bitsRead++; $currentByte <<= 1; if ($this->bitMatrix->get($j - $col, $i)) { $currentByte |= 1; } // If we've made a whole byte, save it off if ($bitsRead == 8) { $result[$resultOffset++] = $currentByte; //(byte) $bitsRead = 0; $currentByte = 0; } } } } $readingUp ^= true; // readingUp = !readingUp; // switch directions } if ($resultOffset != $version->getTotalCodewords()) { throw FormatException::getFormatInstance(); } return $result; }