str_replace in Font.php now seems to work as expected

src/Smalot/PdfParser/Font.php

@@ -434,8 +434,8 @@ public function decodeText(array $commands): string
 
             // replace escaped chars
             $text = str_replace(
-                ['\\\\', '\(', '\)', '\n', '\r', '\t', '\f', '\ '],
-                ['\\', '(', ')', "\n", "\r", "\t", "\f", ' '],
+                ['\\\\', '\(', '\)', '\n', '\r', '\t', '\f', '\ ', '\b'],
+                [\chr(92), \chr(40), \chr(41), \chr(10), \chr(13), \chr(9), \chr(12), \chr(32), \chr(8)],
                 $text
             );
 

tests/PHPUnit/Unit/FontTest.php

@@ -0,0 +1,71 @@
+<?php
+
+/**
+ * @file This file is part of the PdfParser library.
+ *
+ * @author  Konrad Abicht <k.abicht@gmail.com>
+ *
+ * @date    2023-07-19
+ *
+ * @license LGPLv3
+ *
+ * @url     <https://github.com/smalot/pdfparser>
+ *
+ *  PdfParser is a pdf library written in PHP, extraction oriented.
+ *  Copyright (C) 2017 - Sébastien MALOT <sebastien@malot.fr>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program.
+ *  If not, see <http://www.pdfparser.org/sites/default/LICENSE.txt>.
+ */
+
+namespace PHPUnitTests\Unit;
+
+use PHPUnitTests\TestCase;
+use Smalot\PdfParser\Config;
+use Smalot\PdfParser\Document;
+use Smalot\PdfParser\Font;
+use Smalot\PdfParser\PDFObject;
+
+class FontTest extends TestCase
+{
+    /**
+     * decodeText must decode \b.
+     *
+     * @see https://github.com/smalot/pdfparser/pull/597
+     */
+    public function testDecodeTextIssue597(): void
+    {
+        $config = $this->createMock(Config::class);
+        $config->method('getFontSpaceLimit')->willReturn(1);
+
+        $document = $this->createMock(Document::class);
+        $sut = new Font($document, null, null, $config);
+
+        $commands = [
+            [
+                PDFObject::TYPE => '<',
+                PDFObject::COMMAND => "<ab>\b",
+            ],
+        ];
+
+        // result is a binary string and looks like: 0x3cc2ab083e
+        $result = $sut->decodeText($commands);
+
+        // check that \b is not part of the result anymore
+        self::assertFalse(strpos($result, "\b>"));
+
+        // compare result with expected value
+        self::assertEquals('3cc2ab083e', bin2hex($result));
+    }
+}