PHP Zend_Pdf_Trailer::toString方法代码示例

 /**
  * Render the completed PDF to a string.
  * If $newSegmentOnly is true, then only appended part of PDF is returned.
  *
  * @param boolean $newSegmentOnly
  * @return string
  */
 public function render($newSegmentOnly = false)
 {
     $this->_dumpPages();
     // Check, that PDF file was modified
     // File is always modified by _dumpPages() now, but future implementations may eliminate this.
     if (!$this->_objFactory->isModified()) {
         if ($newSegmentOnly) {
             return '';
         } else {
             return $this->_trailer->getPDFString();
         }
     }
     // offset (from a start of PDF file) of new PDF file segment
     $segmentOffset = $this->_trailer->getPDFLength();
     // new PDF file segment itself
     $pdfSegment = '';
     // Last Object number in a list of free objects
     $lastFreeObject = $this->_trailer->getLastFreeObject();
     // Array of cross-reference table subsections
     $xrefTable = array();
     // Object numbers of first objects in each subsection
     $xrefSectionStartNums = array();
     // Last cross-reference table subsection
     $xrefSection = array();
     // Dummy initialization of the first element (specail case - header of linked list of free objects).
     $xrefSection[] = 0;
     $xrefSectionStartNums[] = 0;
     // Object number of last processed PDF object.
     // Used to manage cross-reference subsections.
     // Initialized by zero (specail case - header of linked list of free objects).
     $lastObjNum = 0;
     // Iterate objects to create new reference table
     foreach ($this->_objFactory->listModifiedObjects() as $updateInfo) {
         $objNum = $updateInfo->getObjNum();
         if ($objNum - $lastObjNum != 1) {
             // Save cross-reference table subsection and start new one
             $xrefTable[] = $xrefSection;
             $xrefSection = array();
             $xrefSectionStartNums[] = $objNum;
         }
         if ($updateInfo->isFree()) {
             // Free object cross-reference table entry
             $xrefSection[] = sprintf("%010d %05d f \n", $lastFreeObject, $updateInfo->getGenNum());
             $lastFreeObject = $objNum;
         } else {
             // In-use object cross-reference table entry
             $xrefSection[] = sprintf("%010d %05d n \n", $segmentOffset + strlen($pdfSegment), $updateInfo->getGenNum());
             $pdfSegment .= $updateInfo->getObjectDump();
         }
         $lastObjNum = $objNum;
     }
     // Save last cross-reference table subsection
     $xrefTable[] = $xrefSection;
     // Modify first entry (specail case - header of linked list of free objects).
     $xrefTable[0][0] = sprintf("%010d 65535 f \n", $lastFreeObject);
     $xrefTableStr = "xref\n";
     foreach ($xrefTable as $sectId => $xrefSection) {
         $xrefTableStr .= sprintf("%d %d \n", $xrefSectionStartNums[$sectId], count($xrefSection));
         foreach ($xrefSection as $xrefTableEntry) {
             $xrefTableStr .= $xrefTableEntry;
         }
     }
     $xrefStartOffset = $segmentOffset + strlen($pdfSegment);
     $this->_trailer->Size->value = $this->_objFactory->getObjectCount();
     $pdfSegment .= $xrefTableStr . $this->_trailer->toString() . "startxref\n" . $xrefStartOffset . "\n" . "%%EOF\n";
     if ($newSegmentOnly) {
         return $pdfSegment;
     } else {
         return $this->_trailer->getPDFString() . $pdfSegment;
     }
 }

//.........这里部分代码省略.........
        }

        // offset (from a start of PDF file) of new PDF file segment
        $offset = $this->_trailer->getPDFLength();
        // Last Object number in a list of free objects
        $lastFreeObject = $this->_trailer->getLastFreeObject();

        // Array of cross-reference table subsections
        $xrefTable = array();
        // Object numbers of first objects in each subsection
        $xrefSectionStartNums = array();

        // Last cross-reference table subsection
        $xrefSection = array();
        // Dummy initialization of the first element (specail case - header of linked list of free objects).
        $xrefSection[] = 0;
        $xrefSectionStartNums[] = 0;
        // Object number of last processed PDF object.
        // Used to manage cross-reference subsections.
        // Initialized by zero (specail case - header of linked list of free objects).
        $lastObjNum = 0;

        if ($outputStream !== null) {
            if (!$newSegmentOnly) {
                $pdfData = $this->_trailer->getPDFString();
                while ( strlen($pdfData) > 0 && ($byteCount = fwrite($outputStream, $pdfData)) != false ) {
                    $pdfData = substr($pdfData, $byteCount);
                }
            }
        } else {
            $pdfSegmentBlocks = ($newSegmentOnly) ? array() : array($this->_trailer->getPDFString());
        }

        // Iterate objects to create new reference table
        foreach ($this->_objFactory->listModifiedObjects() as $updateInfo) {
            $objNum = $updateInfo->getObjNum();

            if ($objNum - $lastObjNum != 1) {
                // Save cross-reference table subsection and start new one
                $xrefTable[] = $xrefSection;
                $xrefSection = array();
                $xrefSectionStartNums[] = $objNum;
            }

            if ($updateInfo->isFree()) {
                // Free object cross-reference table entry
                $xrefSection[]  = sprintf("%010d %05d f \n", $lastFreeObject, $updateInfo->getGenNum());
                $lastFreeObject = $objNum;
            } else {
                // In-use object cross-reference table entry
                $xrefSection[]  = sprintf("%010d %05d n \n", $offset, $updateInfo->getGenNum());

                $pdfBlock = $updateInfo->getObjectDump();
                $offset += strlen($pdfBlock);

                if ($outputStream === null) {
                    $pdfSegmentBlocks[] = $pdfBlock;
                } else {
                    while ( strlen($pdfBlock) > 0 && ($byteCount = fwrite($outputStream, $pdfBlock)) != false ) {
                        $pdfBlock = substr($pdfBlock, $byteCount);
                    }
                }
            }
            $lastObjNum = $objNum;
        }
        // Save last cross-reference table subsection
        $xrefTable[] = $xrefSection;

        // Modify first entry (specail case - header of linked list of free objects).
        $xrefTable[0][0] = sprintf("%010d 65535 f \n", $lastFreeObject);

        $xrefTableStr = "xref\n";
        foreach ($xrefTable as $sectId => $xrefSection) {
            $xrefTableStr .= sprintf("%d %d \n", $xrefSectionStartNums[$sectId], count($xrefSection));
            foreach ($xrefSection as $xrefTableEntry) {
                $xrefTableStr .= $xrefTableEntry;
            }
        }

        $this->_trailer->Size->value = $this->_objFactory->getObjectCount();

        $pdfBlock = $xrefTableStr
                 .  $this->_trailer->toString()
                 . "startxref\n" . $offset . "\n"
                 . "%%EOF\n";

        $this->_objFactory->cleanEnumerationShiftCache();

        if ($outputStream === null) {
            $pdfSegmentBlocks[] = $pdfBlock;

            return implode('', $pdfSegmentBlocks);
        } else {
            while ( strlen($pdfBlock) > 0 && ($byteCount = fwrite($outputStream, $pdfBlock)) != false ) {
                $pdfBlock = substr($pdfBlock, $byteCount);
            }

            return '';
        }
    }