Mfonte\Base62x\Compression\Gzip\GzipCompression

Complexity

Total Complexity

12

Size/Duplication

Total Lines	65
Duplicated Lines	0 %

Importance

Changes	3
Bugs	2	Features	0

2 Methods

Rating	Name	Duplication	Size	Complexity
B	decode()	0	32	6
A	encode()	0	29	6

<?php

namespace Mfonte\Base62x\Compression\Gzip;

use Mfonte\Base62x\Exception\CompressionException;

class GzipCompression
{
    public static function encode($data, $encoding = null)
    {
        if (!\function_exists('gzencode')) {
            throw new CompressionException('gzip', 'Cannot use Gzip as compression algorithm: the current PHP installation does not support this module.');
        }

        $encoded = false;
        switch ($encoding) {
            case 'zlib':
                $encoded = @gzcompress($data, 9);
            break;
            case 'deflate':
                $encoded = @gzdeflate($data, 9);
            break;
            case 'gzip':
                $encoded = @gzencode($data, 9);
            break;
            default:
                $encoded = @gzencode($data, 9);
        }

        if ($encoded === false) {
            throw new CompressionException('gzip', 'The gz compression function returned a false state while compressing the input data.');
        }

        // avoid data errors: perform a base64_encode prior of returning
        $encoded = base64_encode($encoded);

        return $encoded;
    }

    public static function decode($data, $encoding = null)
    {
        if (!\function_exists('gzdecode')) {
            throw new CompressionException('gzip', 'Cannot use Gzip as compression algorithm: the current PHP installation does not support this module.');
        }

        // the data comes encoded in base64: see above
        $data = base64_decode($data, true);

        $fn = 'gzdecode';
        $decoded = false;
        switch ($encoding) {
            case 'zlib':
                $fn = 'gzuncompress';
                $decoded = @gzuncompress($data);
            break;
            case 'deflate':
                $fn = 'gzinflate';
                $decoded = @gzinflate($data);
            break;
            case 'gzip':
                $decoded = @gzdecode($data);
            break;
            default:
                $decoded = @gzdecode($data);
        }

        if ($decoded === false) {
            throw new CompressionException('gzip', "The {$fn}() function returned a false state while uncompressing the input data.");
        }

        return $decoded;
    }
}