Zend_Pdf_Filter_Ascii85 Class Reference

Inheritance diagram for Zend_Pdf_Filter_Ascii85:

Static Public Member Functions
static	encode ($data, $params=null)
static	decode ($data, $params=null)

Detailed Description

Definition at line 33 of file Ascii85.php.

Member Function Documentation

decode()

static decode (   $data,   $params = null  )

static

Decode data

Parameters

string	$data
array	$params

Returns

string

Exceptions

Zend_Pdf_Exception

Implements Zend_Pdf_Filter_Interface.

Definition at line 114 of file Ascii85.php.

    {
        $output = '';

        //get rid of the whitespaces
        $whiteSpace = array("\x00", "\x09", "\x0A", "\x0C", "\x0D", "\x20");
        $data = str_replace($whiteSpace, '', $data);

        if (substr($data, -2) != '~>') {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Invalid EOF marker');
            return '';
        }

        $data = substr($data, 0, (strlen($data) - 2));
        $dataLength = strlen($data);

        for ($i = 0; $i < $dataLength; $i += 5) {
            $b = 0;

            if (substr($data, $i, 1) == "z") {
                $i -= 4;
                $output .= pack("N", 0);
                continue;
            }

            $c = substr($data, $i, 5);

            if(strlen($c) < 5) {
                //partial chunk
                break;
            }

            $c = unpack('C5', $c);
            $value = 0;

            for ($j = 1; $j <= 5; $j++) {
                $value += (($c[$j] - 33) * pow(85, (5 - $j)));
            }

            $output .= pack("N", $value);
        }

        //decode partial
        if ($i < $dataLength) {
            $value = 0;
            $chunk = substr($data, $i);
            $partialLength = strlen($chunk);

            //pad the rest of the chunk with u's
            //until the lenght of the chunk is 5
            for ($j = 0; $j < (5 - $partialLength); $j++) {
                $chunk .= 'u';
            }

            $c = unpack('C5', $chunk);

            for ($j = 1; $j <= 5; $j++) {
                $value += (($c[$j] - 33) * pow(85, (5 - $j)));
            }

            $foo = pack("N", $value);
            $output .= substr($foo, 0, ($partialLength - 1));
        }

        return $output;
    }

encode()

static encode (   $data,   $params = null  )

static

Encode data

Parameters

string	$data
array	$params

Returns

string

Exceptions

Zend_Pdf_Exception

Implements Zend_Pdf_Filter_Interface.

Definition at line 43 of file Ascii85.php.

    {
        $output = '';
        $dataLength = strlen($data);

        for ($i = 0; $i < $dataLength; $i += 4) {
            //convert the 4 characters into a 32-bit number
            $chunk = substr($data, $i, 4);

            if (strlen($chunk) < 4) {
                //partial chunk
                break;
            }

            $b = unpack("N", $chunk);
            $b = $b[1];

            //special char for all 4 bytes = 0
            if ($b == 0) {
                $output .= 'z';
                continue;
            }

            //encode into 5 bytes
            for ($j = 4; $j >= 0; $j--) {
                $foo = (int) (($b / pow(85,$j)) + 33);
                $b %= pow(85,$j);
                $output .= chr($foo);
            }
        }

        //encode partial chunk
        if ($i < $dataLength) {
            $n = $dataLength - $i;
            $chunk = substr($data, -$n);

            //0 pad the rest
            for ($j = $n;$j < 4;$j++) {
                $chunk .= "\0";
            }

            $b = unpack("N", $chunk);
            $b = $b[1];

            //encode just $n + 1
            for ($j = 4; $j >= (4 - $n); $j--) {
                $foo = (int) (($b / pow(85,$j)) + 33);
                $b %= pow(85,$j);
                $output .= chr($foo);
            }
        }

        //EOD
        $output .= '~>';

        //make sure lines are split
        $output = chunk_split($output, 76, "\n");

        //get rid of new line at the end
        $output = substr($output, 0, -1);
        return $output;
    }

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The documentation for this class was generated from the following file:

• vendor/magento/zendframework1/library/Zend/Pdf/Filter/Ascii85.php