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<?php |
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namespace Xls\Record; |
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use Xls\Biff8; |
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class ContinueRecord extends AbstractRecord |
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{ |
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const NAME = 'CONTINUE'; |
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const ID = 0x003C; |
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/** |
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* Excel limits the size of BIFF records. In Excel 97 the limit is 8228 bytes. |
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* Records that are longer than these limits |
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* must be split up into CONTINUE blocks. |
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* |
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* This function takes a long BIFF record and inserts CONTINUE records as |
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* necessary. |
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* |
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* @param string $data The original binary data to be written |
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* |
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* @return string Сonvenient string of continue blocks |
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*/ |
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public function getData($data) |
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{ |
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//reserve 4 bytes for header |
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$limit = Biff8::LIMIT - 4; |
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// The first bytes below limit remain intact. However, we have to change |
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// the length field of the record. |
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$recordId = substr($data, 0, 2); |
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$newRecordSize = $limit - 4; |
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$recordData = substr($data, 4, $newRecordSize); |
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$result = $recordId . pack("v", $newRecordSize) . $recordData; |
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$data = substr($data, $newRecordSize + 4); |
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$result .= $this->getDataRaw($data); |
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return $result; |
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} |
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public function getDataRaw($data) |
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{ |
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//reserve 4 bytes for header |
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$limit = Biff8::LIMIT - 4; |
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$dataLength = strlen($data); |
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$result = ''; |
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// Retrieve chunks of 8224 bytes +4 for the header |
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for ($i = 0; $i < $dataLength - $limit; $i += $limit) { |
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$chunk = substr($data, $i, $limit); |
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$result .= $this->getFullRecord($chunk); |
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} |
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// Retrieve the last chunk of data |
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$lastChunkLength = $dataLength - $i; |
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if ($lastChunkLength > 0) { |
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$lastChunk = substr($data, $i, $lastChunkLength); |
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$result .= $this->getFullRecord($lastChunk); |
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} |
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return $result; |
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} |
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} |
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MAXakaWIZARD /
xls-writer
