PhpOffice\Common\Microsoft\OLERead::read()

Complexity

Conditions	10
Paths	82

Size

Total Lines	88
Code Lines	44

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	0
CRAP Score	110

Importance

Changes	1
Bugs	0	Features	0

<?php
    public function read($sFileName)
    {
        // Check if file exists and is readable
        if (!is_readable($sFileName)) {
            throw new \Exception("Could not open " . $sFileName . " for reading! File does not exist, or it is not readable.");
        }

        // Get the file identifier
        // Don't bother reading the whole file until we know it's a valid OLE file
        $this->data = file_get_contents($sFileName, false, null, 0, 8);

        // Check OLE identifier
        if ($this->data != self::IDENTIFIER_OLE) {
            throw new \Exception('The filename ' . $sFileName . ' is not recognised as an OLE file');
        }

        // Get the file data
        $this->data = file_get_contents($sFileName);

        // Total number of sectors used for the SAT
        $numBigBlkDepotBlks = self::getInt4d($this->data, self::NUM_BIG_BLOCK_DEPOT_BLOCKS_POS);

        // SecID of the first sector of the directory stream
        $rootStartBlock = self::getInt4d($this->data, self::ROOT_START_BLOCK_POS);

        // SecID of the first sector of the SSAT (or -2 if not extant)
        $sbdStartBlock = self::getInt4d($this->data, self::SMALL_BLOCK_DEPOT_BLOCK_POS);

        // SecID of the first sector of the MSAT (or -2 if no additional sectors are used)
        $extensionBlock = self::getInt4d($this->data, self::EXTENSION_BLOCK_POS);

        // Total number of sectors used by MSAT
        $numExtensionBlocks = self::getInt4d($this->data, self::NUM_EXTENSION_BLOCK_POS);

        $bigBlockDepotBlocks = array();
        $pos = self::BIG_BLOCK_DEPOT_BLOCKS_POS;

        $bbdBlocks = $numBigBlkDepotBlks;

        if ($numExtensionBlocks != 0) {
            $bbdBlocks = (self::BIG_BLOCK_SIZE - self::BIG_BLOCK_DEPOT_BLOCKS_POS)/4;
        }

        for ($i = 0; $i < $bbdBlocks; ++$i) {
              $bigBlockDepotBlocks[$i] = self::getInt4d($this->data, $pos);
              $pos += 4;
        }

        for ($j = 0; $j < $numExtensionBlocks; ++$j) {
            $pos = ($extensionBlock + 1) * self::BIG_BLOCK_SIZE;
            $blocksToRead = min($numBigBlkDepotBlks - $bbdBlocks, self::BIG_BLOCK_SIZE / 4 - 1);

            for ($i = $bbdBlocks; $i < $bbdBlocks + $blocksToRead; ++$i) {
                $bigBlockDepotBlocks[$i] = self::getInt4d($this->data, $pos);
                $pos += 4;
            }

            $bbdBlocks += $blocksToRead;
            if ($bbdBlocks < $numBigBlkDepotBlks) {
                $extensionBlock = self::getInt4d($this->data, $pos);
            }
        }

        $this->bigBlockChain = '';
        $bbs = self::BIG_BLOCK_SIZE / 4;
        for ($i = 0; $i < $numBigBlkDepotBlks; ++$i) {
            $pos = ($bigBlockDepotBlocks[$i] + 1) * self::BIG_BLOCK_SIZE;

            $this->bigBlockChain .= substr($this->data, $pos, 4*$bbs);
            $pos += 4*$bbs;
        }

        $sbdBlock = $sbdStartBlock;
        $this->smallBlockChain = '';
        while ($sbdBlock != -2) {
            $pos = ($sbdBlock + 1) * self::BIG_BLOCK_SIZE;

            $this->smallBlockChain .= substr($this->data, $pos, 4*$bbs);
            $pos += 4*$bbs;

            $sbdBlock = self::getInt4d($this->bigBlockChain, $sbdBlock*4);
        }

        // read the directory stream
        $block = $rootStartBlock;
        $this->entry = $this->readData($block);

        $this->readPropertySets();
    }