Fix for the BIFF-8 Xls colour mappings in the Reader (#2156)

* Fix for the BIFF-8 Xls colour mappings in the Reader
* Unit test for reading colours, writing hen rereading and ensuring that the RGB values have not changed

src/PhpSpreadsheet/Reader/Xls/Color/BIFF8.php

@@ -5,62 +5,62 @@ namespace PhpOffice\PhpSpreadsheet\Reader\Xls\Color;
 class BIFF8
 {
     protected static $map = [
-        '000000' => 0x08,
-        'FFFFFF' => 0x09,
-        'FF0000' => 0x0A,
-        '00FF00' => 0x0B,
-        '0000FF' => 0x0C,
-        'FFFF00' => 0x0D,
-        'FF00FF' => 0x0E,
-        '00FFFF' => 0x0F,
-        '800000' => 0x10,
-        '008000' => 0x11,
-        '000080' => 0x12,
-        '808000' => 0x13,
-        '800080' => 0x14,
-        '008080' => 0x15,
-        'C0C0C0' => 0x16,
-        '808080' => 0x17,
-        '9999FF' => 0x18,
-        '993366' => 0x19,
-        'FFFFCC' => 0x1A,
-        'CCFFFF' => 0x1B,
-        '660066' => 0x1C,
-        'FF8080' => 0x1D,
-        '0066CC' => 0x1E,
-        'CCCCFF' => 0x1F,
-        //        '000080' => 0x20,
-        //        'FF00FF' => 0x21,
-        //        'FFFF00' => 0x22,
-        //        '00FFFF' => 0x23,
-        //        '800080' => 0x24,
-        //        '800000' => 0x25,
-        //        '008080' => 0x26,
-        //        '0000FF' => 0x27,
-        '00CCFF' => 0x28,
-        //        'CCFFFF' => 0x29,
-        'CCFFCC' => 0x2A,
-        'FFFF99' => 0x2B,
-        '99CCFF' => 0x2C,
-        'FF99CC' => 0x2D,
-        'CC99FF' => 0x2E,
-        'FFCC99' => 0x2F,
-        '3366FF' => 0x30,
-        '33CCCC' => 0x31,
-        '99CC00' => 0x32,
-        'FFCC00' => 0x33,
-        'FF9900' => 0x34,
-        'FF6600' => 0x35,
-        '666699' => 0x36,
-        '969696' => 0x37,
-        '003366' => 0x38,
-        '339966' => 0x39,
-        '003300' => 0x3A,
-        '333300' => 0x3B,
-        '993300' => 0x3C,
-        //        '993366' => 0x3D,
-        '333399' => 0x3E,
-        '333333' => 0x3F,
+        0x08 => '000000',
+        0x09 => 'FFFFFF',
+        0x0A => 'FF0000',
+        0x0B => '00FF00',
+        0x0C => '0000FF',
+        0x0D => 'FFFF00',
+        0x0E => 'FF00FF',
+        0x0F => '00FFFF',
+        0x10 => '800000',
+        0x11 => '008000',
+        0x12 => '000080',
+        0x13 => '808000',
+        0x14 => '800080',
+        0x15 => '008080',
+        0x16 => 'C0C0C0',
+        0x17 => '808080',
+        0x18 => '9999FF',
+        0x19 => '993366',
+        0x1A => 'FFFFCC',
+        0x1B => 'CCFFFF',
+        0x1C => '660066',
+        0x1D => 'FF8080',
+        0x1E => '0066CC',
+        0x1F => 'CCCCFF',
+        0x20 => '000080',
+        0x21 => 'FF00FF',
+        0x22 => 'FFFF00',
+        0x23 => '00FFFF',
+        0x24 => '800080',
+        0x25 => '800000',
+        0x26 => '008080',
+        0x27 => '0000FF',
+        0x28 => '00CCFF',
+        0x29 => 'CCFFFF',
+        0x2A => 'CCFFCC',
+        0x2B => 'FFFF99',
+        0x2C => '99CCFF',
+        0x2D => 'FF99CC',
+        0x2E => 'CC99FF',
+        0x2F => 'FFCC99',
+        0x30 => '3366FF',
+        0x31 => '33CCCC',
+        0x32 => '99CC00',
+        0x33 => 'FFCC00',
+        0x34 => 'FF9900',
+        0x35 => 'FF6600',
+        0x36 => '666699',
+        0x37 => '969696',
+        0x38 => '003366',
+        0x39 => '339966',
+        0x3A => '003300',
+        0x3B => '333300',
+        0x3C => '993300',
+        0x3D => '993366',
+        0x3E => '333399',
+        0x3F => '333333',
     ];
 
     /**

tests/PhpSpreadsheetTests/Reader/Xls/ColourTest.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xls;
+
+use PhpOffice\PhpSpreadsheet\Reader\Xls;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class ColourTest extends AbstractFunctional
+{
+    /**
+     * @var Spreadsheet
+     */
+    private $spreadsheet;
+
+    protected function setup(): void
+    {
+        $filename = 'tests/data/Reader/XLS/Colours.xls';
+        $reader = new Xls();
+        $this->spreadsheet = $reader->load($filename);
+    }
+
+    public function testColours(): void
+    {
+        $colours = [];
+
+        $worksheet = $this->spreadsheet->getActiveSheet();
+        for ($row = 1; $row <= 7; ++$row) {
+            for ($column = 'A'; $column !== 'J'; ++$column) {
+                $cellAddress = "{$column}{$row}";
+                $colours[$cellAddress] = $worksheet->getStyle($cellAddress)->getFill()->getStartColor()->getRGB();
+            }
+        }
+
+        $newSpreadsheet = $this->writeAndReload($this->spreadsheet, 'Xls');
+        $newWorksheet = $newSpreadsheet->getActiveSheet();
+        foreach ($colours as $cellAddress => $expectedColourValue) {
+            $actualColourValue = $newWorksheet->getStyle($cellAddress)->getFill()->getStartColor()->getRGB();
+            self::assertSame($expectedColourValue, $actualColourValue);
+        }
+    }
+}