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<?php
declare(strict_types=1);
namespace ZipStream;
use RuntimeException;
/**
* @internal
* TODO: Make class readonly when requiring PHP 8.2 exclusively
*/
class PackField
{
public const MAX_V = 0xFFFFFFFF;
public const MAX_v = 0xFFFF;
public function __construct(
public readonly string $format,
public readonly int|string $value
) {}
/**
* Create a format string and argument list for pack(), then call
* pack() and return the result.
*/
public static function pack(self ...$fields): string
{
$fmt = array_reduce($fields, function (string $acc, self $field) {
return $acc . $field->format;
}, '');
$args = array_map(function (self $field) {
switch ($field->format) {
case 'V':
if ($field->value > self::MAX_V) {
throw new RuntimeException(print_r($field->value, true) . ' is larger than 32 bits');
}
break;
case 'v':
if ($field->value > self::MAX_v) {
throw new RuntimeException(print_r($field->value, true) . ' is larger than 16 bits');
}
break;
case 'P': break;
default:
break;
}
return $field->value;
}, $fields);
return pack($fmt, ...$args);
}
}
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