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<?php |
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namespace Mfonte\Base62x\Compression\Gzip; |
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use Mfonte\Base62x\Exception\CompressionException; |
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7
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class GzipCompression |
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{ |
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public static function encode($data, $encoding = null) |
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{ |
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if (!\function_exists('gzencode')) { |
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throw new CompressionException('gzip', 'Cannot use Gzip as compression algorithm: the current PHP installation does not support this module.'); |
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} |
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14
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15
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$encoded = false; |
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switch ($encoding) { |
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case 'zlib': |
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$encoded = @gzcompress($data, 9); |
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break; |
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case 'deflate': |
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$encoded = @gzdeflate($data, 9); |
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break; |
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case 'gzip': |
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$encoded = @gzencode($data, 9); |
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break; |
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default: |
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$encoded = @gzencode($data, 9); |
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} |
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if ($encoded === false) { |
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throw new CompressionException('gzip', 'The gz compression function returned a false state while compressing the input data.'); |
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} |
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// avoid data errors: perform a base64_encode prior of returning |
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$encoded = base64_encode($encoded); |
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return $encoded; |
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} |
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public static function decode($data, $encoding = null) |
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{ |
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if (!\function_exists('gzdecode')) { |
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throw new CompressionException('gzip', 'Cannot use Gzip as compression algorithm: the current PHP installation does not support this module.'); |
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} |
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// the data comes encoded in base64: see above |
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$data = base64_decode($data, true); |
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$fn = 'gzdecode'; |
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$decoded = false; |
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switch ($encoding) { |
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case 'zlib': |
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$fn = 'gzuncompress'; |
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$decoded = @gzuncompress($data); |
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break; |
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case 'deflate': |
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$fn = 'gzinflate'; |
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$decoded = @gzinflate($data); |
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break; |
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case 'gzip': |
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$decoded = @gzdecode($data); |
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break; |
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default: |
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64
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$decoded = @gzdecode($data); |
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} |
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66
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67
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if ($decoded === false) { |
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68
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throw new CompressionException('gzip', "The {$fn}() function returned a false state while uncompressing the input data."); |
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69
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} |
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70
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71
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return $decoded; |
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} |
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} |
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mauriziofonte /
php-base62x
