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