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✏️ Editing: EanUpc.php

<?php

namespace Mpdf\Barcode;

/**
 * EAN13 and UPC-A barcodes.
 * EAN13: European Article Numbering international retail product code
 * UPC-A: Universal product code seen on almost all retail products in the USA and Canada
 * UPC-E: Short version of UPC symbol
 */
class EanUpc extends \Mpdf\Barcode\AbstractBarcode implements \Mpdf\Barcode\BarcodeInterface
{

/**
	 * @param string $code
	 * @param int $length
	 * @param float $leftMargin
	 * @param float $rightMargin
	 * @param float $xDim
	 * @param float $barHeight
	 */
	public function __construct($code, $length, $leftMargin, $rightMargin, $xDim, $barHeight)
	{
		$this->init($code, $length);

$this->data['lightmL'] = $leftMargin; // LEFT light margin =  x X-dim (http://www.gs1uk.org)
		$this->data['lightmR'] = $rightMargin; // RIGHT light margin =  x X-dim (http://www.gs1uk.org)
		$this->data['nom-X'] = $xDim; // Nominal value for X-dim in mm (http://www.gs1uk.org)
		$this->data['nom-H'] = $barHeight; // Nominal bar height in mm incl. numerals (http://www.gs1uk.org)
	}

/**
	 * @param string $code
	 * @param int $length
	 */
	private function init($code, $length)
	{
		if (preg_match('/[\D]+/', $code)) {
			throw new \Mpdf\Barcode\BarcodeException(sprintf('Invalid EAN UPC barcode value "%s"', $code));
		}

$upce = false;
		$checkdigit = false;

if ($length == 6) {
			$length = 12; // UPC-A
			$upce = true; // UPC-E mode
		}
		$dataLength = $length - 1;

// Padding
		$code = str_pad($code, $dataLength, '0', STR_PAD_LEFT);
		$codeLength = strlen($code);

// Calculate check digit
		$sum_a = 0;
		for ($i = 1; $i < $dataLength; $i += 2) {
			$sum_a += $code[$i];
		}

if ($length > 12) {
			$sum_a *= 3;
		}
		$sum_b = 0;
		for ($i = 0; $i < $dataLength; $i += 2) {
			$sum_b += ($code[$i]);
		}

if ($length < 13) {
			$sum_b *= 3;
		}

$r = ($sum_a + $sum_b) % 10;
		if ($r > 0) {
			$r = (10 - $r);
		}

if ($codeLength == $dataLength) {
			// Add check digit
			$code .= $r;
			$checkdigit = $r;
		} elseif ($r !== (int) $code[$dataLength]) {
			// Wrong checkdigit
			throw new \Mpdf\Barcode\BarcodeException(sprintf('Invalid EAN UPC barcode value "%s"', $code));
		}

if ($length == 12) {
			// UPC-A
			$code = '0' . $code;
			++$length;
		}

if ($upce) {
			// Convert UPC-A to UPC-E
			$tmp = substr($code, 4, 3);
			$prodCode = (int) substr($code, 7, 5); // product code
			$invalidUpce = false;
			if (($tmp == '000') or ($tmp == '100') or ($tmp == '200')) {
				// Manufacturer code ends in 000, 100, or 200
				$upceCode = substr($code, 2, 2) . substr($code, 9, 3) . substr($code, 4, 1);
				if ($prodCode > 999) {
					$invalidUpce = true;
				}
			} else {
				$tmp = substr($code, 5, 2);
				if ($tmp == '00') {
					// Manufacturer code ends in 00
					$upceCode = substr($code, 2, 3) . substr($code, 10, 2) . '3';
					if ($prodCode > 99) {
						$invalidUpce = true;
					}
				} else {
					$tmp = substr($code, 6, 1);
					if ($tmp == '0') {
						// Manufacturer code ends in 0
						$upceCode = substr($code, 2, 4) . substr($code, 11, 1) . '4';
						if ($prodCode > 9) {
							$invalidUpce = true;
						}
					} else {
						// Manufacturer code does not end in zero
						$upceCode = substr($code, 2, 5) . substr($code, 11, 1);
						if ($prodCode > 9) {
							$invalidUpce = true;
						}
					}
				}
			}

if ($invalidUpce) {
				throw new \Mpdf\Barcode\BarcodeException('UPC-A cannot produce a valid UPC-E barcode');
			}
		}

// Convert digits to bars
		$codes = [
			'A' => [// left odd parity
				'0' => '0001101',
				'1' => '0011001',
				'2' => '0010011',
				'3' => '0111101',
				'4' => '0100011',
				'5' => '0110001',
				'6' => '0101111',
				'7' => '0111011',
				'8' => '0110111',
				'9' => '0001011'],
			'B' => [// left even parity
				'0' => '0100111',
				'1' => '0110011',
				'2' => '0011011',
				'3' => '0100001',
				'4' => '0011101',
				'5' => '0111001',
				'6' => '0000101',
				'7' => '0010001',
				'8' => '0001001',
				'9' => '0010111'],
			'C' => [// right
				'0' => '1110010',
				'1' => '1100110',
				'2' => '1101100',
				'3' => '1000010',
				'4' => '1011100',
				'5' => '1001110',
				'6' => '1010000',
				'7' => '1000100',
				'8' => '1001000',
				'9' => '1110100']
		];

$parities = [
			'0' => ['A', 'A', 'A', 'A', 'A', 'A'],
			'1' => ['A', 'A', 'B', 'A', 'B', 'B'],
			'2' => ['A', 'A', 'B', 'B', 'A', 'B'],
			'3' => ['A', 'A', 'B', 'B', 'B', 'A'],
			'4' => ['A', 'B', 'A', 'A', 'B', 'B'],
			'5' => ['A', 'B', 'B', 'A', 'A', 'B'],
			'6' => ['A', 'B', 'B', 'B', 'A', 'A'],
			'7' => ['A', 'B', 'A', 'B', 'A', 'B'],
			'8' => ['A', 'B', 'A', 'B', 'B', 'A'],
			'9' => ['A', 'B', 'B', 'A', 'B', 'A']
		];

$upceParities = [];
		$upceParities[0] = [
			'0' => ['B', 'B', 'B', 'A', 'A', 'A'],
			'1' => ['B', 'B', 'A', 'B', 'A', 'A'],
			'2' => ['B', 'B', 'A', 'A', 'B', 'A'],
			'3' => ['B', 'B', 'A', 'A', 'A', 'B'],
			'4' => ['B', 'A', 'B', 'B', 'A', 'A'],
			'5' => ['B', 'A', 'A', 'B', 'B', 'A'],
			'6' => ['B', 'A', 'A', 'A', 'B', 'B'],
			'7' => ['B', 'A', 'B', 'A', 'B', 'A'],
			'8' => ['B', 'A', 'B', 'A', 'A', 'B'],
			'9' => ['B', 'A', 'A', 'B', 'A', 'B']
		];

$upceParities[1] = [
			'0' => ['A', 'A', 'A', 'B', 'B', 'B'],
			'1' => ['A', 'A', 'B', 'A', 'B', 'B'],
			'2' => ['A', 'A', 'B', 'B', 'A', 'B'],
			'3' => ['A', 'A', 'B', 'B', 'B', 'A'],
			'4' => ['A', 'B', 'A', 'A', 'B', 'B'],
			'5' => ['A', 'B', 'B', 'A', 'A', 'B'],
			'6' => ['A', 'B', 'B', 'B', 'A', 'A'],
			'7' => ['A', 'B', 'A', 'B', 'A', 'B'],
			'8' => ['A', 'B', 'A', 'B', 'B', 'A'],
			'9' => ['A', 'B', 'B', 'A', 'B', 'A']
		];

$k = 0;
		$seq = '101'; // left guard bar

if ($upce && isset($upceCode)) {
			$bararray = ['code' => $upceCode, 'maxw' => 0, 'maxh' => 1, 'bcode' => []];
			$p = $upceParities[$code[1]][$r];
			for ($i = 0; $i < 6; ++$i) {
				$seq .= $codes[$p[$i]][$upceCode[$i]];
			}
			$seq .= '010101'; // right guard bar
		} else {
			$bararray = ['code' => $code, 'maxw' => 0, 'maxh' => 1, 'bcode' => []];
			$halfLen = ceil($length / 2);
			if ($length == 8) {
				for ($i = 0; $i < $halfLen; ++$i) {
					$seq .= $codes['A'][$code[$i]];
				}
			} else {
				$p = $parities[$code[0]];
				for ($i = 1; $i < $halfLen; ++$i) {
					$seq .= $codes[$p[$i - 1]][$code[$i]];
				}
			}
			$seq .= '01010'; // center guard bar
			for ($i = $halfLen; $i < $length; ++$i) {
				$seq .= $codes['C'][$code[(int) $i]];
			}
			$seq .= '101'; // right guard bar
		}

$clen = strlen($seq);
		$w = 0;
		for ($i = 0; $i < $clen; ++$i) {
			$w += 1;
			if (($i == ($clen - 1)) or (($i < ($clen - 1)) and ($seq[$i] != $seq[($i + 1)]))) {
				if ($seq[$i] == '1') {
					$t = true; // bar
				} else {
					$t = false; // space
				}
				$bararray['bcode'][$k] = ['t' => $t, 'w' => $w, 'h' => 1, 'p' => 0];
				$bararray['maxw'] += $w;
				++$k;
				$w = 0;
			}
		}
		$bararray['checkdigit'] = $checkdigit;

$this->data = $bararray;
	}

/**
	 * @inheritdoc
	 */
	public function getType()
	{
		return 'EANUPC';
	}

}

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