Fix For #1772 Null Exception on ODS Read (#1776)

Fix for #1772.
Header and Footer Properties may be omitted in Page Setting Style Set.
Code changed to allow for this possibility, and tests added.

src/PhpSpreadsheet/Reader/Ods/PageSettings.php

@@ -54,10 +54,10 @@ private function readPageSettingStyles(DOMDocument $styleDom): void
             $marginBottom = $pageLayoutProperties->getAttributeNS($this->stylesFo, 'margin-bottom');
             $header = $styleSet->getElementsByTagNameNS($this->stylesNs, 'header-style')[0];
             $headerProperties = $header->getElementsByTagNameNS($this->stylesNs, 'header-footer-properties')[0];
-            $marginHeader = $headerProperties->getAttributeNS($this->stylesFo, 'min-height');
+            $marginHeader = isset($headerProperties) ? $headerProperties->getAttributeNS($this->stylesFo, 'min-height') : null;
             $footer = $styleSet->getElementsByTagNameNS($this->stylesNs, 'footer-style')[0];
             $footerProperties = $footer->getElementsByTagNameNS($this->stylesNs, 'header-footer-properties')[0];
-            $marginFooter = $footerProperties->getAttributeNS($this->stylesFo, 'min-height');
+            $marginFooter = isset($footerProperties) ? $footerProperties->getAttributeNS($this->stylesFo, 'min-height') : null;
 
             $this->pageLayoutStyles[$styleName] = (object) [
                 'orientation' => $styleOrientation ?: PageSetup::ORIENTATION_DEFAULT,

tests/PhpSpreadsheetTests/Reader/Ods/PageSetupBug1772Test.php

@@ -0,0 +1,98 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Ods;
+
+use PhpOffice\PhpSpreadsheet\Reader\Ods;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Worksheet\PageSetup;
+use PHPUnit\Framework\TestCase;
+
+class PageSetupBug1772Test extends TestCase
+{
+    private const MARGIN_PRECISION = 0.00000001;
+
+    /**
+     * @var Spreadsheet
+     */
+    private $spreadsheet;
+
+    protected function setup(): void
+    {
+        $filename = 'tests/data/Reader/Ods/bug1772.ods';
+        $reader = new Ods();
+        $this->spreadsheet = $reader->load($filename);
+    }
+
+    public function testPageSetup(): void
+    {
+        $assertions = $this->pageSetupAssertions();
+
+        foreach ($this->spreadsheet->getAllSheets() as $worksheet) {
+            if (!array_key_exists($worksheet->getTitle(), $assertions)) {
+                continue;
+            }
+
+            $sheetAssertions = $assertions[$worksheet->getTitle()];
+            foreach ($sheetAssertions as $test => $expectedResult) {
+                $testMethodName = 'get' . ucfirst($test);
+                $actualResult = $worksheet->getPageSetup()->$testMethodName();
+                self::assertSame(
+                    $expectedResult,
+                    $actualResult,
+                    "Failed assertion for Worksheet '{$worksheet->getTitle()}' {$test}"
+                );
+            }
+        }
+    }
+
+    public function testPageMargins(): void
+    {
+        $assertions = $this->pageMarginAssertions();
+
+        foreach ($this->spreadsheet->getAllSheets() as $worksheet) {
+            if (!array_key_exists($worksheet->getTitle(), $assertions)) {
+                continue;
+            }
+
+            $sheetAssertions = $assertions[$worksheet->getTitle()];
+            foreach ($sheetAssertions as $test => $expectedResult) {
+                $testMethodName = 'get' . ucfirst($test);
+                $actualResult = $worksheet->getPageMargins()->$testMethodName();
+                self::assertEqualsWithDelta(
+                    $expectedResult,
+                    $actualResult,
+                    self::MARGIN_PRECISION,
+                    "Failed assertion for Worksheet '{$worksheet->getTitle()}' {$test} margin"
+                );
+            }
+        }
+    }
+
+    private function pageSetupAssertions(): array
+    {
+        return [
+            'Employee update template' => [
+                'orientation' => PageSetup::ORIENTATION_DEFAULT,
+                'scale' => 100,
+                'horizontalCentered' => false,
+                'verticalCentered' => false,
+                'pageOrder' => PageSetup::PAGEORDER_DOWN_THEN_OVER,
+            ],
+        ];
+    }
+
+    private function pageMarginAssertions(): array
+    {
+        return [
+            'Employee update template' => [
+                // Here the values are in cm
+                'top' => 0.0,
+                'header' => 0.2953,
+                'left' => 0.0,
+                'right' => 0.0,
+                'bottom' => 0.0,
+                'footer' => 0.2953,
+            ],
+        ];
+    }
+}