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<?php
namespace PhpOffice\PhpSpreadsheet\Shared;
// vim: set expandtab tabstop=4 shiftwidth=4:
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Author: Xavier Noguer <xnoguer@php.net> |
// | Based on OLE::Storage_Lite by Kawai, Takanori |
// +----------------------------------------------------------------------+
//
use PhpOffice\PhpSpreadsheet\Exception;
use PhpOffice\PhpSpreadsheet\Reader\Exception as ReaderException;
use PhpOffice\PhpSpreadsheet\Shared\OLE\ChainedBlockStream;
use PhpOffice\PhpSpreadsheet\Shared\OLE\PPS\Root;
/*
* Array for storing OLE instances that are accessed from
* OLE_ChainedBlockStream::stream_open().
*
* @var array
*/
$GLOBALS['_OLE_INSTANCES'] = [];
/**
* OLE package base class.
*
* @author Xavier Noguer <xnoguer@php.net>
* @author Christian Schmidt <schmidt@php.net>
*/
class OLE
{
const OLE_PPS_TYPE_ROOT = 5;
const OLE_PPS_TYPE_DIR = 1;
const OLE_PPS_TYPE_FILE = 2;
const OLE_DATA_SIZE_SMALL = 0x1000;
const OLE_LONG_INT_SIZE = 4;
const OLE_PPS_SIZE = 0x80;
/**
* The file handle for reading an OLE container.
*
* @var resource
*/
public $_file_handle;
/**
* Array of PPS's found on the OLE container.
*/
public array $_list = [];
/**
* Root directory of OLE container.
*/
public Root $root;
/**
* Big Block Allocation Table.
*
* @var array (blockId => nextBlockId)
*/
public array $bbat;
/**
* Short Block Allocation Table.
*
* @var array (blockId => nextBlockId)
*/
public array $sbat;
/**
* Size of big blocks. This is usually 512.
*
* @var int number of octets per block
*/
public int $bigBlockSize;
/**
* Size of small blocks. This is usually 64.
*
* @var int number of octets per block
*/
public int $smallBlockSize;
/**
* Threshold for big blocks.
*/
public int $bigBlockThreshold;
/**
* Reads an OLE container from the contents of the file given.
*
* @acces public
*
* @return bool true on success, PEAR_Error on failure
*/
public function read(string $filename): bool
{
$fh = @fopen($filename, 'rb');
if ($fh === false) {
throw new ReaderException("Can't open file $filename");
}
$this->_file_handle = $fh;
$signature = fread($fh, 8);
if ("\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" != $signature) {
throw new ReaderException("File doesn't seem to be an OLE container.");
}
fseek($fh, 28);
if (fread($fh, 2) != "\xFE\xFF") {
// This shouldn't be a problem in practice
throw new ReaderException('Only Little-Endian encoding is supported.');
}
// Size of blocks and short blocks in bytes
$this->bigBlockSize = 2 ** self::readInt2($fh);
$this->smallBlockSize = 2 ** self::readInt2($fh);
// Skip UID, revision number and version number
fseek($fh, 44);
// Number of blocks in Big Block Allocation Table
$bbatBlockCount = self::readInt4($fh);
// Root chain 1st block
$directoryFirstBlockId = self::readInt4($fh);
// Skip unused bytes
fseek($fh, 56);
// Streams shorter than this are stored using small blocks
$this->bigBlockThreshold = self::readInt4($fh);
// Block id of first sector in Short Block Allocation Table
$sbatFirstBlockId = self::readInt4($fh);
// Number of blocks in Short Block Allocation Table
$sbbatBlockCount = self::readInt4($fh);
// Block id of first sector in Master Block Allocation Table
$mbatFirstBlockId = self::readInt4($fh);
// Number of blocks in Master Block Allocation Table
$mbbatBlockCount = self::readInt4($fh);
$this->bbat = [];
// Remaining 4 * 109 bytes of current block is beginning of Master
// Block Allocation Table
$mbatBlocks = [];
for ($i = 0; $i < 109; ++$i) {
$mbatBlocks[] = self::readInt4($fh);
}
// Read rest of Master Block Allocation Table (if any is left)
$pos = $this->getBlockOffset($mbatFirstBlockId);
for ($i = 0; $i < $mbbatBlockCount; ++$i) {
fseek($fh, $pos);
for ($j = 0; $j < $this->bigBlockSize / 4 - 1; ++$j) {
$mbatBlocks[] = self::readInt4($fh);
}
// Last block id in each block points to next block
$pos = $this->getBlockOffset(self::readInt4($fh));
}
// Read Big Block Allocation Table according to chain specified by $mbatBlocks
for ($i = 0; $i < $bbatBlockCount; ++$i) {
$pos = $this->getBlockOffset($mbatBlocks[$i]);
fseek($fh, $pos);
for ($j = 0; $j < $this->bigBlockSize / 4; ++$j) {
$this->bbat[] = self::readInt4($fh);
}
}
// Read short block allocation table (SBAT)
$this->sbat = [];
$shortBlockCount = $sbbatBlockCount * $this->bigBlockSize / 4;
$sbatFh = $this->getStream($sbatFirstBlockId);
for ($blockId = 0; $blockId < $shortBlockCount; ++$blockId) {
$this->sbat[$blockId] = self::readInt4($sbatFh);
}
fclose($sbatFh);
$this->readPpsWks($directoryFirstBlockId);
return true;
}
/**
* @param int $blockId byte offset from beginning of file
*/
public function getBlockOffset(int $blockId): int
{
return 512 + $blockId * $this->bigBlockSize;
}
/**
* Returns a stream for use with fread() etc. External callers should
* use \PhpOffice\PhpSpreadsheet\Shared\OLE\PPS\File::getStream().
*
* @param int|OLE\PPS $blockIdOrPps block id or PPS
*
* @return resource read-only stream
*/
public function getStream($blockIdOrPps)
{
static $isRegistered = false;
if (!$isRegistered) {
stream_wrapper_register('ole-chainedblockstream', ChainedBlockStream::class);
$isRegistered = true;
}
// Store current instance in global array, so that it can be accessed
// in OLE_ChainedBlockStream::stream_open().
// Object is removed from self::$instances in OLE_Stream::close().
$GLOBALS['_OLE_INSTANCES'][] = $this;
$keys = array_keys($GLOBALS['_OLE_INSTANCES']);
$instanceId = end($keys);
$path = 'ole-chainedblockstream://oleInstanceId=' . $instanceId;
if ($blockIdOrPps instanceof OLE\PPS) {
$path .= '&blockId=' . $blockIdOrPps->startBlock;
$path .= '&size=' . $blockIdOrPps->Size;
} else {
$path .= '&blockId=' . $blockIdOrPps;
}
$resource = fopen($path, 'rb');
if ($resource === false) {
throw new Exception("Unable to open stream $path");
}
return $resource;
}
/**
* Reads a signed char.
*
* @param resource $fileHandle file handle
*/
private static function readInt1($fileHandle): int
{
[, $tmp] = unpack('c', fread($fileHandle, 1) ?: '') ?: [0, 0];
return $tmp;
}
/**
* Reads an unsigned short (2 octets).
*
* @param resource $fileHandle file handle
*/
private static function readInt2($fileHandle): int
{
[, $tmp] = unpack('v', fread($fileHandle, 2) ?: '') ?: [0, 0];
return $tmp;
}
private const SIGNED_4OCTET_LIMIT = 2147483648;
private const SIGNED_4OCTET_SUBTRACT = 2 * self::SIGNED_4OCTET_LIMIT;
/**
* Reads long (4 octets), interpreted as if signed on 32-bit system.
*
* @param resource $fileHandle file handle
*/
private static function readInt4($fileHandle): int
{
[, $tmp] = unpack('V', fread($fileHandle, 4) ?: '') ?: [0, 0];
if ($tmp >= self::SIGNED_4OCTET_LIMIT) {
$tmp -= self::SIGNED_4OCTET_SUBTRACT;
}
return $tmp;
}
/**
* Gets information about all PPS's on the OLE container from the PPS WK's
* creates an OLE_PPS object for each one.
*
* @param int $blockId the block id of the first block
*
* @return bool true on success, PEAR_Error on failure
*/
public function readPpsWks(int $blockId): bool
{
$fh = $this->getStream($blockId);
for ($pos = 0; true; $pos += 128) {
fseek($fh, $pos, SEEK_SET);
$nameUtf16 = (string) fread($fh, 64);
$nameLength = self::readInt2($fh);
$nameUtf16 = substr($nameUtf16, 0, $nameLength - 2);
// Simple conversion from UTF-16LE to ISO-8859-1
$name = str_replace("\x00", '', $nameUtf16);
$type = self::readInt1($fh);
switch ($type) {
case self::OLE_PPS_TYPE_ROOT:
$pps = new Root(null, null, []);
$this->root = $pps;
break;
case self::OLE_PPS_TYPE_DIR:
$pps = new OLE\PPS(null, null, null, null, null, null, null, null, null, []);
break;
case self::OLE_PPS_TYPE_FILE:
$pps = new OLE\PPS\File($name);
break;
default:
throw new Exception('Unsupported PPS type');
}
fseek($fh, 1, SEEK_CUR);
$pps->Type = $type;
$pps->Name = $name;
$pps->PrevPps = self::readInt4($fh);
$pps->NextPps = self::readInt4($fh);
$pps->DirPps = self::readInt4($fh);
fseek($fh, 20, SEEK_CUR);
$pps->Time1st = self::OLE2LocalDate((string) fread($fh, 8));
$pps->Time2nd = self::OLE2LocalDate((string) fread($fh, 8));
$pps->startBlock = self::readInt4($fh);
$pps->Size = self::readInt4($fh);
$pps->No = count($this->_list);
$this->_list[] = $pps;
// check if the PPS tree (starting from root) is complete
if (isset($this->root) && $this->ppsTreeComplete($this->root->No)) {
break;
}
}
fclose($fh);
// Initialize $pps->children on directories
foreach ($this->_list as $pps) {
if ($pps->Type == self::OLE_PPS_TYPE_DIR || $pps->Type == self::OLE_PPS_TYPE_ROOT) {
$nos = [$pps->DirPps];
$pps->children = [];
while (!empty($nos)) {
$no = array_pop($nos);
if ($no != -1) {
$childPps = $this->_list[$no];
$nos[] = $childPps->PrevPps;
$nos[] = $childPps->NextPps;
$pps->children[] = $childPps;
}
}
}
}
return true;
}
/**
* It checks whether the PPS tree is complete (all PPS's read)
* starting with the given PPS (not necessarily root).
*
* @param int $index The index of the PPS from which we are checking
*
* @return bool Whether the PPS tree for the given PPS is complete
*/
private function ppsTreeComplete(int $index): bool
{
return isset($this->_list[$index])
&& ($pps = $this->_list[$index])
&& ($pps->PrevPps == -1
|| $this->ppsTreeComplete($pps->PrevPps))
&& ($pps->NextPps == -1
|| $this->ppsTreeComplete($pps->NextPps))
&& ($pps->DirPps == -1
|| $this->ppsTreeComplete($pps->DirPps));
}
/**
* Checks whether a PPS is a File PPS or not.
* If there is no PPS for the index given, it will return false.
*
* @param int $index The index for the PPS
*
* @return bool true if it's a File PPS, false otherwise
*/
public function isFile(int $index): bool
{
if (isset($this->_list[$index])) {
return $this->_list[$index]->Type == self::OLE_PPS_TYPE_FILE;
}
return false;
}
/**
* Checks whether a PPS is a Root PPS or not.
* If there is no PPS for the index given, it will return false.
*
* @param int $index the index for the PPS
*
* @return bool true if it's a Root PPS, false otherwise
*/
public function isRoot(int $index): bool
{
if (isset($this->_list[$index])) {
return $this->_list[$index]->Type == self::OLE_PPS_TYPE_ROOT;
}
return false;
}
/**
* Gives the total number of PPS's found in the OLE container.
*
* @return int The total number of PPS's found in the OLE container
*/
public function ppsTotal(): int
{
return count($this->_list);
}
/**
* Gets data from a PPS
* If there is no PPS for the index given, it will return an empty string.
*
* @param int $index The index for the PPS
* @param int $position The position from which to start reading
* (relative to the PPS)
* @param int $length The amount of bytes to read (at most)
*
* @return string The binary string containing the data requested
*
* @see OLE_PPS_File::getStream()
*/
public function getData(int $index, int $position, int $length): string
{
// if position is not valid return empty string
if (!isset($this->_list[$index]) || ($position >= $this->_list[$index]->Size) || ($position < 0)) {
return '';
}
$fh = $this->getStream($this->_list[$index]);
$data = (string) stream_get_contents($fh, $length, $position);
fclose($fh);
return $data;
}
/**
* Gets the data length from a PPS
* If there is no PPS for the index given, it will return 0.
*
* @param int $index The index for the PPS
*
* @return int The amount of bytes in data the PPS has
*/
public function getDataLength(int $index): int
{
if (isset($this->_list[$index])) {
return $this->_list[$index]->Size;
}
return 0;
}
/**
* Utility function to transform ASCII text to Unicode.
*
* @param string $ascii The ASCII string to transform
*
* @return string The string in Unicode
*/
public static function ascToUcs(string $ascii): string
{
$rawname = '';
$iMax = strlen($ascii);
for ($i = 0; $i < $iMax; ++$i) {
$rawname .= $ascii[$i]
. "\x00";
}
return $rawname;
}
/**
* Utility function
* Returns a string for the OLE container with the date given.
*
* @param float|int $date A timestamp
*
* @return string The string for the OLE container
*/
public static function localDateToOLE($date): string
{
if (!$date) {
return "\x00\x00\x00\x00\x00\x00\x00\x00";
}
$dateTime = Date::dateTimeFromTimestamp("$date");
// days from 1-1-1601 until the beggining of UNIX era
$days = 134774;
// calculate seconds
$big_date = $days * 24 * 3600 + (float) $dateTime->format('U');
// multiply just to make MS happy
$big_date *= 10000000;
// Make HEX string
$res = '';
$factor = 2 ** 56;
while ($factor >= 1) {
$hex = (int) floor($big_date / $factor);
$res = pack('c', $hex) . $res;
$big_date = fmod($big_date, $factor);
$factor /= 256;
}
return $res;
}
/**
* Returns a timestamp from an OLE container's date.
*
* @param string $oleTimestamp A binary string with the encoded date
*
* @return float|int The Unix timestamp corresponding to the string
*/
public static function OLE2LocalDate(string $oleTimestamp)
{
if (strlen($oleTimestamp) != 8) {
throw new ReaderException('Expecting 8 byte string');
}
// convert to units of 100 ns since 1601:
$unpackedTimestamp = unpack('v4', $oleTimestamp) ?: [];
$timestampHigh = (float) $unpackedTimestamp[4] * 65536 + (float) $unpackedTimestamp[3];
$timestampLow = (float) $unpackedTimestamp[2] * 65536 + (float) $unpackedTimestamp[1];
// translate to seconds since 1601:
$timestampHigh /= 10000000;
$timestampLow /= 10000000;
// days from 1601 to 1970:
$days = 134774;
// translate to seconds since 1970:
$unixTimestamp = floor(65536.0 * 65536.0 * $timestampHigh + $timestampLow - $days * 24 * 3600 + 0.5);
return IntOrFloat::evaluate($unixTimestamp);
}
}
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