commit message

vendor/chillerlan/php-qrcode/src/Data/Number.php

@@ -0,0 +1,182 @@
+<?php
+/**
+ * Class Number
+ *
+ * @created      26.11.2015
+ * @author       Smiley <smiley@chillerlan.net>
+ * @copyright    2015 Smiley
+ * @license      MIT
+ */
+
+namespace chillerlan\QRCode\Data;
+
+use chillerlan\QRCode\Common\{BitBuffer, Mode};
+use function array_flip, ceil, intdiv, str_split, substr, unpack;
+
+/**
+ * Numeric mode: decimal digits 0 to 9
+ *
+ * ISO/IEC 18004:2000 Section 8.3.2
+ * ISO/IEC 18004:2000 Section 8.4.2
+ */
+final class Number extends QRDataModeAbstract{
+
+	/**
+	 * @var int[]
+	 */
+	private const NUMBER_TO_ORD = [
+		'0' => 0, '1' => 1, '2' => 2, '3' => 3, '4' => 4, '5' => 5, '6' => 6, '7' => 7, '8' => 8, '9' => 9,
+	];
+
+	/**
+	 * @inheritDoc
+	 */
+	public const DATAMODE = Mode::NUMBER;
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getLengthInBits():int{
+		return (int)ceil($this->getCharCount() * (10 / 3));
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public static function validateString(string $string):bool{
+
+		if($string === ''){
+			return false;
+		}
+
+		foreach(str_split($string) as $chr){
+			if(!isset(self::NUMBER_TO_ORD[$chr])){
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function write(BitBuffer $bitBuffer, int $versionNumber):QRDataModeInterface{
+		$len = $this->getCharCount();
+
+		$bitBuffer
+			->put(self::DATAMODE, 4)
+			->put($len, $this::getLengthBits($versionNumber))
+		;
+
+		$i = 0;
+
+		// encode numeric triplets in 10 bits
+		while(($i + 2) < $len){
+			$bitBuffer->put($this->parseInt(substr($this->data, $i, 3)), 10);
+			$i += 3;
+		}
+
+		if($i < $len){
+
+			// encode 2 remaining numbers in 7 bits
+			if(($len - $i) === 2){
+				$bitBuffer->put($this->parseInt(substr($this->data, $i, 2)), 7);
+			}
+			// encode one remaining number in 4 bits
+			elseif(($len - $i) === 1){
+				$bitBuffer->put($this->parseInt(substr($this->data, $i, 1)), 4);
+			}
+
+		}
+
+		return $this;
+	}
+
+	/**
+	 * get the code for the given numeric string
+	 */
+	private function parseInt(string $string):int{
+		$num = 0;
+
+		foreach(unpack('C*', $string) as $chr){
+			$num = ($num * 10 + $chr - 48);
+		}
+
+		return $num;
+	}
+
+	/**
+	 * @inheritDoc
+	 *
+	 * @throws \chillerlan\QRCode\Data\QRCodeDataException
+	 */
+	public static function decodeSegment(BitBuffer $bitBuffer, int $versionNumber):string{
+		$length  = $bitBuffer->read(self::getLengthBits($versionNumber));
+		$charmap = array_flip(self::NUMBER_TO_ORD);
+
+		// @todo
+		$toNumericChar = function(int $ord) use ($charmap):string{
+
+			if(isset($charmap[$ord])){
+				return $charmap[$ord];
+			}
+
+			throw new QRCodeDataException('invalid character value: '.$ord);
+		};
+
+		$result = '';
+		// Read three digits at a time
+		while($length >= 3){
+			// Each 10 bits encodes three digits
+			if($bitBuffer->available() < 10){
+				throw new QRCodeDataException('not enough bits available'); // @codeCoverageIgnore
+			}
+
+			$threeDigitsBits = $bitBuffer->read(10);
+
+			if($threeDigitsBits >= 1000){
+				throw new QRCodeDataException('error decoding numeric value');
+			}
+
+			$result .= $toNumericChar(intdiv($threeDigitsBits, 100));
+			$result .= $toNumericChar(intdiv($threeDigitsBits, 10) % 10);
+			$result .= $toNumericChar($threeDigitsBits % 10);
+
+			$length -= 3;
+		}
+
+		if($length === 2){
+			// Two digits left over to read, encoded in 7 bits
+			if($bitBuffer->available() < 7){
+				throw new QRCodeDataException('not enough bits available'); // @codeCoverageIgnore
+			}
+
+			$twoDigitsBits = $bitBuffer->read(7);
+
+			if($twoDigitsBits >= 100){
+				throw new QRCodeDataException('error decoding numeric value');
+			}
+
+			$result .= $toNumericChar(intdiv($twoDigitsBits, 10));
+			$result .= $toNumericChar($twoDigitsBits % 10);
+		}
+		elseif($length === 1){
+			// One digit left over to read
+			if($bitBuffer->available() < 4){
+				throw new QRCodeDataException('not enough bits available'); // @codeCoverageIgnore
+			}
+
+			$digitBits = $bitBuffer->read(4);
+
+			if($digitBits >= 10){
+				throw new QRCodeDataException('error decoding numeric value');
+			}
+
+			$result .= $toNumericChar($digitBits);
+		}
+
+		return $result;
+	}
+
+}