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Adding ability to print UPC-E barcodes with UPC-E codes as input #163

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Adding ability to print UPC-E barcodes with UPC-E codes as input #163

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4f1bb66
* UPC-E barcodes are now working with UPC-E codes as well (before, we…
Bernhard-Krop Jul 4, 2022
eb1cbcc
Merge branch 'refs/heads/main' into upc-e
Bernhard-Krop Apr 16, 2024
af3782f
* Added check of whether $upce_code is set.
Bernhard-Krop Apr 16, 2024
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89 changes: 84 additions & 5 deletions src/Types/TypeEanUpcBase.php
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,74 @@ public function getBarcodeData(string $code): Barcode

$dataLength = $length - 1;

// Convert proper UPC-E codes into UPC-A codes.
if ($this->upce) {
$strLen = strlen($code);

if ($strLen === 8) {
// Parity and checksum digits are provided. Store them for later usage.
$checksumDigit = $code[7];
$parityDigit = $code[0];
$code = substr($code, 1, 6);
$strLen -= 2;
}
if ($strLen === 7) {
// Either parity or checksum digit is provided.
if (($code[0] === '0') || ($code[0] === '1')) {
// Assume parity digit.
$parityDigit = $code[0];
$code = substr($code, 1, 6);
} else {
// Assume checksum digit.
$checksumDigit = $code[6];
$code = substr($code, 0, 6);
}

--$strLen;
}
if ($strLen === 6) {
// Store original UPC-E code for later usage.
$upce_code = $code; // Neither parity digit nor checksum digit are printed in UPC-E barcode.

// Convert UPC-E code into UPC-A code.
$conversionData = array (
'0' => array (2, '00000'),
'1' => array (2, '10000'),
'2' => array (2, '20000'),
'3' => array (3, '00000'),
'4' => array (4, '00000'),
'5' => array (5, '00005'),
'6' => array (5, '00006'),
'7' => array (5, '00007'),
'8' => array (5, '00008'),
'9' => array (5, '00009')
);
$lastUpcEDigit = $code[5];

if (!isset ($conversionData[$lastUpcEDigit])) {
throw new InvalidCharacterException('Char ' . $lastUpcEDigit . ' not allowed');
}

$conversionData = $conversionData[$lastUpcEDigit];
$code = substr($upce_code, 0, $conversionData[0]); // Add all Xs.
$code .= $conversionData[1]; // Add constant number.
$code .= substr($upce_code, $conversionData[0], 5 - $conversionData[0]); // Add all Ns.

// Add parity digit.
if (!isset ($parityDigit)) {
// Provide '0' as default parity digit.
$parityDigit = '0';
}

$code = $parityDigit . $code;

// Add checksum digit.
if (isset ($checksumDigit)) {
$code .= $checksumDigit;
} // else { The checksum digit will be calculated and added, later. }
}
}

// Add zero padding in front
$code = str_pad($code, $dataLength, '0', STR_PAD_LEFT);

Expand All @@ -44,16 +112,27 @@ public function getBarcodeData(string $code): Barcode
} elseif ($checksumDigit !== intval($code[$dataLength])) {
// If length of given barcode is same as final length, barcode is including checksum
// Make sure that checksum is the same as we calculated
throw new InvalidCheckDigitException();
if ($this->upce && isset ($upce_code)) {
// It's possible that parity digit was not provided and the assumed '0' is wrong. Try again with '1'.
$parityDigit = '1';
$code[0] = $parityDigit;
$checksumDigit = $this->calculateChecksumDigit($code);

if ($checksumDigit !== intval($code[$dataLength])) {
throw new InvalidCheckDigitException();
}
} else {
throw new InvalidCheckDigitException();
}
}

if ($this->upca || $this->upce) {
$code = '0' . $code;
++$length;
}
if ($this->upce) {
// convert UPC-A to UPC-E

if ($this->upce && !isset ($upce_code)) {
// UPC-A code shall be printed as UPC-E code. Convert UPC-A into UPC-E:
$tmp = substr($code, 4, 3);
if (($tmp == '000') OR ($tmp == '100') OR ($tmp == '200')) {
// manufacturer code ends in 000, 100, or 200
Expand Down Expand Up @@ -157,7 +236,7 @@ public function getBarcodeData(string $code): Barcode
];

$seq = '101'; // left guard bar
if ($this->upce) {
if ($this->upce && isset ($upce_code)) {
$barcode = new Barcode($upce_code);
$p = $upce_parities[$code[1]][$checksumDigit];
for ($i = 0; $i < 6; ++$i) {
Expand Down