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Xls Writer - Correct Timestamp Bug, Improve Coverage (#1493) 

* Xls Writer - Correct Timestamp Bug, Improve Coverage

I believe that Xls Writer is 100% covered now.

The Xls Writer sets its timestamp incorrectly. The problem is actually
in Shared/Ole::localDateToOLE, which converts its timestamp using
gmmktime; mktime is correct. If I save a file at 3:00 p.m. in San Francisco,
this bug means the time is actually recorded as 3:00 p.m. UTC.
A consequence of this is that if you use Phpspreadsheet to read the
file and save it as a new Xls, the creation timestamp goes further
and further back in time with each generation (or further forward
if east of Greenwich). One of the tests added confirms that
the creation timestamp is consistent with the start and end times
of the test.

The major change in coverage is adding tests to save GIF and BMP
images, which aren't supported in Xls, but are converted to PNG
in the PhpSpreadsheet code.
This commit is contained in:
oleibman 2020-06-19 12:08:36 -07:00 committed by GitHub
parent a5a0268050
commit b3d30f4cbc
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5 changed files with 235 additions and 197 deletions
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9
src/PhpSpreadsheet/Shared/OLE.php
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@ -505,7 +505,7 @@ class OLE
// days from 1-1-1601 until the beggining of UNIX era
$days = 134774;
// calculate seconds
$big_date = $days * 24 * 3600 + gmmktime(date('H', $date), date('i', $date), date('s', $date), date('m', $date), date('d', $date), date('Y', $date));
$big_date = $days * 24 * 3600 + mktime((int) date('H', $date), (int) date('i', $date), (int) date('s', $date), (int) date('m', $date), (int) date('d', $date), (int) date('Y', $date));
// multiply just to make MS happy
$big_date *= 10000000;
@ -558,10 +558,9 @@ class OLE
// translate to seconds since 1970:
$unixTimestamp = floor(65536.0 * 65536.0 * $timestampHigh + $timestampLow - $days * 24 * 3600 + 0.5);
if ((int) $unixTimestamp == $unixTimestamp) {
return (int) $unixTimestamp;
}
$iTimestamp = (int) $unixTimestamp;
return $unixTimestamp >= 0.0 ? PHP_INT_MAX : PHP_INT_MIN;
// Overflow conditions can't happen on 64-bit system
return ($iTimestamp == $unixTimestamp) ? $iTimestamp : ($unixTimestamp >= 0.0 ? PHP_INT_MAX : PHP_INT_MIN);
}
}

339
src/PhpSpreadsheet/Writer/Xls.php
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@ -23,7 +23,6 @@ use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Worksheet\BaseDrawing;
use PhpOffice\PhpSpreadsheet\Worksheet\Drawing;
use PhpOffice\PhpSpreadsheet\Worksheet\MemoryDrawing;
use RuntimeException;
class Xls extends BaseWriter
{
@ -389,13 +388,94 @@ class Xls extends BaseWriter
}
}
/**
* Build the Escher object corresponding to the MSODRAWINGGROUP record.
*/
private function buildWorkbookEscher(): void
private function processMemoryDrawing(BstoreContainer &$bstoreContainer, BaseDrawing $drawing, string $renderingFunctionx): void
{
$escher = null;
switch ($renderingFunctionx) {
case MemoryDrawing::RENDERING_JPEG:
$blipType = BSE::BLIPTYPE_JPEG;
$renderingFunction = 'imagejpeg';
break;
default:
$blipType = BSE::BLIPTYPE_PNG;
$renderingFunction = 'imagepng';
break;
}
ob_start();
call_user_func($renderingFunction, $drawing->getImageResource());
$blipData = ob_get_contents();
ob_end_clean();
$blip = new Blip();
$blip->setData($blipData);
$BSE = new BSE();
$BSE->setBlipType($blipType);
$BSE->setBlip($blip);
$bstoreContainer->addBSE($BSE);
}
private function processDrawing(BstoreContainer &$bstoreContainer, BaseDrawing $drawing): void
{
$blipData = '';
$filename = $drawing->getPath();
[$imagesx, $imagesy, $imageFormat] = getimagesize($filename);
switch ($imageFormat) {
case 1: // GIF, not supported by BIFF8, we convert to PNG
$blipType = BSE::BLIPTYPE_PNG;
ob_start();
imagepng(imagecreatefromgif($filename));
$blipData = ob_get_contents();
ob_end_clean();
break;
case 2: // JPEG
$blipType = BSE::BLIPTYPE_JPEG;
$blipData = file_get_contents($filename);
break;
case 3: // PNG
$blipType = BSE::BLIPTYPE_PNG;
$blipData = file_get_contents($filename);
break;
case 6: // Windows DIB (BMP), we convert to PNG
$blipType = BSE::BLIPTYPE_PNG;
ob_start();
imagepng(SharedDrawing::imagecreatefrombmp($filename));
$blipData = ob_get_contents();
ob_end_clean();
break;
}
if ($blipData) {
$blip = new Blip();
$blip->setData($blipData);
$BSE = new BSE();
$BSE->setBlipType($blipType);
$BSE->setBlip($blip);
$bstoreContainer->addBSE($BSE);
}
}
private function processBaseDrawing(BstoreContainer &$bstoreContainer, BaseDrawing $drawing): void
{
if ($drawing instanceof Drawing) {
$this->processDrawing($bstoreContainer, $drawing);
} elseif ($drawing instanceof MemoryDrawing) {
$this->processMemoryDrawing($bstoreContainer, $drawing, $drawing->getRenderingFunction());
}
}
private function checkForDrawings(): bool
{
// any drawings in this workbook?
$found = false;
foreach ($this->spreadsheet->getAllSheets() as $sheet) {
@ -406,8 +486,16 @@ class Xls extends BaseWriter
}
}
return $found;
}
/**
* Build the Escher object corresponding to the MSODRAWINGGROUP record.
*/
private function buildWorkbookEscher(): void
{
// nothing to do if there are no drawings
if (!$found) {
if (!$this->checkForDrawings()) {
return;
}
@ -429,17 +517,16 @@ class Xls extends BaseWriter
foreach ($this->spreadsheet->getAllsheets() as $sheet) {
$sheetCountShapes = 0; // count number of shapes (minus group shape), in sheet
if (count($sheet->getDrawingCollection()) > 0) {
++$countDrawings;
$addCount = 0;
foreach ($sheet->getDrawingCollection() as $drawing) {
$addCount = 1;
++$sheetCountShapes;
++$totalCountShapes;
foreach ($sheet->getDrawingCollection() as $drawing) {
++$sheetCountShapes;
++$totalCountShapes;
$spId = $sheetCountShapes | ($this->spreadsheet->getIndex($sheet) + 1) << 10;
$spIdMax = max($spId, $spIdMax);
}
$spId = $sheetCountShapes | ($this->spreadsheet->getIndex($sheet) + 1) << 10;
$spIdMax = max($spId, $spIdMax);
}
$countDrawings += $addCount;
}
$dggContainer->setSpIdMax($spIdMax + 1);
@ -453,83 +540,7 @@ class Xls extends BaseWriter
// the BSE's (all the images)
foreach ($this->spreadsheet->getAllsheets() as $sheet) {
foreach ($sheet->getDrawingCollection() as $drawing) {
if (!extension_loaded('gd')) {
throw new RuntimeException('Saving images in xls requires gd extension');
}
if ($drawing instanceof Drawing) {
$filename = $drawing->getPath();
[$imagesx, $imagesy, $imageFormat] = getimagesize($filename);
switch ($imageFormat) {
case 1: // GIF, not supported by BIFF8, we convert to PNG
$blipType = BSE::BLIPTYPE_PNG;
ob_start();
imagepng(imagecreatefromgif($filename));
$blipData = ob_get_contents();
ob_end_clean();
break;
case 2: // JPEG
$blipType = BSE::BLIPTYPE_JPEG;
$blipData = file_get_contents($filename);
break;
case 3: // PNG
$blipType = BSE::BLIPTYPE_PNG;
$blipData = file_get_contents($filename);
break;
case 6: // Windows DIB (BMP), we convert to PNG
$blipType = BSE::BLIPTYPE_PNG;
ob_start();
imagepng(SharedDrawing::imagecreatefrombmp($filename));
$blipData = ob_get_contents();
ob_end_clean();
break;
default:
continue 2;
}
$blip = new Blip();
$blip->setData($blipData);
$BSE = new BSE();
$BSE->setBlipType($blipType);
$BSE->setBlip($blip);
$bstoreContainer->addBSE($BSE);
} elseif ($drawing instanceof MemoryDrawing) {
switch ($drawing->getRenderingFunction()) {
case MemoryDrawing::RENDERING_JPEG:
$blipType = BSE::BLIPTYPE_JPEG;
$renderingFunction = 'imagejpeg';
break;
case MemoryDrawing::RENDERING_GIF:
case MemoryDrawing::RENDERING_PNG:
case MemoryDrawing::RENDERING_DEFAULT:
$blipType = BSE::BLIPTYPE_PNG;
$renderingFunction = 'imagepng';
break;
}
ob_start();
call_user_func($renderingFunction, $drawing->getImageResource());
$blipData = ob_get_contents();
ob_end_clean();
$blip = new Blip();
$blip->setData($blipData);
$BSE = new BSE();
$BSE->setBlipType($blipType);
$BSE->setBlip($blip);
$bstoreContainer->addBSE($BSE);
}
$this->processBaseDrawing($bstoreContainer, $drawing);
}
}
@ -578,8 +589,8 @@ class Xls extends BaseWriter
++$dataSection_NumProps;
// GKPIDDSI_CATEGORY : Category
if ($this->spreadsheet->getProperties()->getCategory()) {
$dataProp = $this->spreadsheet->getProperties()->getCategory();
$dataProp = $this->spreadsheet->getProperties()->getCategory();
if ($dataProp) {
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => 0x02],
'offset' => ['pack' => 'V'],
@ -707,11 +718,7 @@ class Xls extends BaseWriter
$dataSection_Content_Offset += 4 + 4;
} elseif ($dataProp['type']['data'] == 0x0B) { // Boolean
if ($dataProp['data']['data'] == false) {
$dataSection_Content .= pack('V', 0x0000);
} else {
$dataSection_Content .= pack('V', 0x0001);
}
$dataSection_Content .= pack('V', (int) $dataProp['data']['data']);
$dataSection_Content_Offset += 4 + 4;
} elseif ($dataProp['type']['data'] == 0x1E) { // null-terminated string prepended by dword string length
// Null-terminated string
@ -725,12 +732,12 @@ class Xls extends BaseWriter
$dataSection_Content .= $dataProp['data']['data'];
$dataSection_Content_Offset += 4 + 4 + strlen($dataProp['data']['data']);
} elseif ($dataProp['type']['data'] == 0x40) { // Filetime (64-bit value representing the number of 100-nanosecond intervals since January 1, 1601)
$dataSection_Content .= $dataProp['data']['data'];
// Condition below can never be true
//} elseif ($dataProp['type']['data'] == 0x40) { // Filetime (64-bit value representing the number of 100-nanosecond intervals since January 1, 1601)
// $dataSection_Content .= $dataProp['data']['data'];
$dataSection_Content_Offset += 4 + 8;
// $dataSection_Content_Offset += 4 + 8;
} else {
// Data Type Not Used at the moment
$dataSection_Content .= $dataProp['data']['data'];
$dataSection_Content_Offset += 4 + $dataProp['data']['length'];
@ -752,6 +759,32 @@ class Xls extends BaseWriter
return $data;
}
private function writeSummaryPropOle(int $dataProp, int &$dataSection_NumProps, array &$dataSection, int $sumdata, int $typdata): void
{
if ($dataProp) {
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => $sumdata],
'offset' => ['pack' => 'V'],
'type' => ['pack' => 'V', 'data' => $typdata], // null-terminated string prepended by dword string length
'data' => ['data' => OLE::localDateToOLE($dataProp)],
];
++$dataSection_NumProps;
}
}
private function writeSummaryProp(string $dataProp, int &$dataSection_NumProps, array &$dataSection, int $sumdata, int $typdata): void
{
if ($dataProp) {
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => $sumdata],
'offset' => ['pack' => 'V'],
'type' => ['pack' => 'V', 'data' => $typdata], // null-terminated string prepended by dword string length
'data' => ['data' => $dataProp, 'length' => strlen($dataProp)],
];
++$dataSection_NumProps;
}
}
/**
* Build the OLE Part for Summary Information.
*
@ -792,94 +825,16 @@ class Xls extends BaseWriter
];
++$dataSection_NumProps;
// Title
if ($this->spreadsheet->getProperties()->getTitle()) {
$dataProp = $this->spreadsheet->getProperties()->getTitle();
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => 0x02],
'offset' => ['pack' => 'V'],
'type' => ['pack' => 'V', 'data' => 0x1E], // null-terminated string prepended by dword string length
'data' => ['data' => $dataProp, 'length' => strlen($dataProp)],
];
++$dataSection_NumProps;
}
// Subject
if ($this->spreadsheet->getProperties()->getSubject()) {
$dataProp = $this->spreadsheet->getProperties()->getSubject();
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => 0x03],
'offset' => ['pack' => 'V'],
'type' => ['pack' => 'V', 'data' => 0x1E], // null-terminated string prepended by dword string length
'data' => ['data' => $dataProp, 'length' => strlen($dataProp)],
];
++$dataSection_NumProps;
}
// Author (Creator)
if ($this->spreadsheet->getProperties()->getCreator()) {
$dataProp = $this->spreadsheet->getProperties()->getCreator();
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => 0x04],
'offset' => ['pack' => 'V'],
'type' => ['pack' => 'V', 'data' => 0x1E], // null-terminated string prepended by dword string length
'data' => ['data' => $dataProp, 'length' => strlen($dataProp)],
];
++$dataSection_NumProps;
}
// Keywords
if ($this->spreadsheet->getProperties()->getKeywords()) {
$dataProp = $this->spreadsheet->getProperties()->getKeywords();
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => 0x05],
'offset' => ['pack' => 'V'],
'type' => ['pack' => 'V', 'data' => 0x1E], // null-terminated string prepended by dword string length
'data' => ['data' => $dataProp, 'length' => strlen($dataProp)],
];
++$dataSection_NumProps;
}
// Comments (Description)
if ($this->spreadsheet->getProperties()->getDescription()) {
$dataProp = $this->spreadsheet->getProperties()->getDescription();
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => 0x06],
'offset' => ['pack' => 'V'],
'type' => ['pack' => 'V', 'data' => 0x1E], // null-terminated string prepended by dword string length
'data' => ['data' => $dataProp, 'length' => strlen($dataProp)],
];
++$dataSection_NumProps;
}
// Last Saved By (LastModifiedBy)
if ($this->spreadsheet->getProperties()->getLastModifiedBy()) {
$dataProp = $this->spreadsheet->getProperties()->getLastModifiedBy();
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => 0x08],
'offset' => ['pack' => 'V'],
'type' => ['pack' => 'V', 'data' => 0x1E], // null-terminated string prepended by dword string length
'data' => ['data' => $dataProp, 'length' => strlen($dataProp)],
];
++$dataSection_NumProps;
}
// Created Date/Time
if ($this->spreadsheet->getProperties()->getCreated()) {
$dataProp = $this->spreadsheet->getProperties()->getCreated();
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => 0x0C],
'offset' => ['pack' => 'V'],
'type' => ['pack' => 'V', 'data' => 0x40], // Filetime (64-bit value representing the number of 100-nanosecond intervals since January 1, 1601)
'data' => ['data' => OLE::localDateToOLE($dataProp)],
];
++$dataSection_NumProps;
}
// Modified Date/Time
if ($this->spreadsheet->getProperties()->getModified()) {
$dataProp = $this->spreadsheet->getProperties()->getModified();
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => 0x0D],
'offset' => ['pack' => 'V'],
'type' => ['pack' => 'V', 'data' => 0x40], // Filetime (64-bit value representing the number of 100-nanosecond intervals since January 1, 1601)
'data' => ['data' => OLE::localDateToOLE($dataProp)],
];
++$dataSection_NumProps;
}
$props = $this->spreadsheet->getProperties();
$this->writeSummaryProp($props->getTitle(), $dataSection_NumProps, $dataSection, 0x02, 0x1e);
$this->writeSummaryProp($props->getSubject(), $dataSection_NumProps, $dataSection, 0x03, 0x1e);
$this->writeSummaryProp($props->getCreator(), $dataSection_NumProps, $dataSection, 0x04, 0x1e);
$this->writeSummaryProp($props->getKeywords(), $dataSection_NumProps, $dataSection, 0x05, 0x1e);
$this->writeSummaryProp($props->getDescription(), $dataSection_NumProps, $dataSection, 0x06, 0x1e);
$this->writeSummaryProp($props->getLastModifiedBy(), $dataSection_NumProps, $dataSection, 0x08, 0x1e);
$this->writeSummaryPropOle($props->getCreated(), $dataSection_NumProps, $dataSection, 0x0c, 0x40);
$this->writeSummaryPropOle($props->getModified(), $dataSection_NumProps, $dataSection, 0x0d, 0x40);
// Security
$dataSection[] = [
'summary' => ['pack' => 'V', 'data' => 0x13],

84
tests/PhpSpreadsheetTests/Writer/Xls/XlsGifBmpTest.php Normal file
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@ -0,0 +1,84 @@
<?php
namespace PhpOffice\PhpSpreadsheetTests\Writer\Xls;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Worksheet\Drawing;
use PhpOffice\PhpSpreadsheet\Worksheet\MemoryDrawing;
use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
class XlsGifBmpTest extends AbstractFunctional
{
private $filename = '';
protected function tearDown(): void
{
if ($this->filename) {
unlink($this->filename);
}
$this->filename = '';
}
public function testBmp(): void
{
$pgmstart = time();
$spreadsheet = new Spreadsheet();
$filstart = $spreadsheet->getProperties()->getModified();
self::assertLessThanOrEqual($filstart, $pgmstart);
// Add a drawing to the worksheet
$drawing = new Drawing();
$drawing->setName('Letters B, M, and P');
$drawing->setDescription('Handwritten B, M, and P');
$drawing->setPath(__DIR__ . '/../../../../samples/images/bmp.bmp');
$drawing->setHeight(36);
$drawing->setWorksheet($spreadsheet->getActiveSheet());
$drawing->setCoordinates('A1');
$reloadedSpreadsheet = $this->writeAndReload($spreadsheet, 'Xls');
$creationDatestamp = $reloadedSpreadsheet->getProperties()->getCreated();
$filstart = $creationDatestamp;
$pSheet = $reloadedSpreadsheet->getActiveSheet();
$drawings = $pSheet->getDrawingCollection();
self::assertCount(1, $drawings);
foreach ($pSheet->getDrawingCollection() as $drawing) {
// See if Scrutinizer approves this
$mimeType = ($drawing instanceof MemoryDrawing) ? $drawing->getMimeType() : 'notmemorydrawing';
self::assertEquals('image/png', $mimeType);
}
$pgmend = time();
self::assertLessThanOrEqual($pgmend, $pgmstart);
self::assertLessThanOrEqual($pgmend, $filstart);
self::assertLessThanOrEqual($filstart, $pgmstart);
}
public function testGif(): void
{
$spreadsheet = new Spreadsheet();
// Add a drawing to the worksheet
$drawing = new Drawing();
$drawing->setName('Letters G, I, and G');
$drawing->setDescription('Handwritten G, I, and F');
$drawing->setPath(__DIR__ . '/../../../../samples/images/gif.gif');
$drawing->setHeight(36);
$drawing->setWorksheet($spreadsheet->getActiveSheet());
$drawing->setCoordinates('A1');
$reloadedSpreadsheet = $this->writeAndReload($spreadsheet, 'Xls');
$pSheet = $reloadedSpreadsheet->getActiveSheet();
$drawings = $pSheet->getDrawingCollection();
self::assertCount(1, $drawings);
foreach ($pSheet->getDrawingCollection() as $drawing) {
$mimeType = ($drawing instanceof MemoryDrawing) ? $drawing->getMimeType() : 'notmemorydrawing';
self::assertEquals('image/png', $mimeType);
}
}
public function testInvalidTimestamp(): void
{
$this->expectException(\PhpOffice\PhpSpreadsheet\Reader\Exception::class);
\PhpOffice\PhpSpreadsheet\Shared\OLE::OLE2LocalDate(' ');
}
}