Add PDFDocEncoding

src/Document/Encoding/PDFDocEncoding.php

@@ -0,0 +1,62 @@
+<?php declare(strict_types=1);
+
+namespace PrinsFrank\PdfParser\Document\Encoding;
+
+use Override;
+
+/** @see Annex D.3 */
+class PDFDocEncoding implements Encoding {
+    private const CHAR_MAP = [
+        128 => "\u{2022}",
+        129 => "\u{2020}",
+        130 => "\u{2021}",
+        131 => "\u{2026}",
+        132 => "\u{2014}",
+        133 => "\u{2013}",
+        134 => "\u{0192}",
+        135 => "\u{2044}",
+        136 => "\u{2039}",
+        137 => "\u{203A}",
+        138 => "\u{2212}",
+        139 => "\u{2030}",
+        140 => "\u{201E}",
+        141 => "\u{201C}",
+        142 => "\u{201D}",
+        143 => "\u{2018}",
+        144 => "\u{2019}",
+        145 => "\u{201A}",
+        146 => "\u{2122}",
+        147 => "\u{FB01}",
+        148 => "\u{FB02}",
+        149 => "\u{0141}",
+        150 => "\u{0152}",
+        151 => "\u{0160}",
+        152 => "\u{0178}",
+        153 => "\u{017D}",
+        154 => "\u{0131}",
+        155 => "\u{0142}",
+        156 => "\u{0153}",
+        157 => "\u{0161}",
+        158 => "\u{017E}",
+        159 => "\u{FFFD}",
+        160 => "\u{20AC}",
+    ];
+
+    #[Override]
+    public static function textToUnicode(string $string): string {
+        $result = '';
+        $length = strlen($string);
+        for ($i = 0; $i < $length; $i++) {
+            $byte = ord($string[$i]);
+            if ($byte < 128) {
+                $result .= chr($byte);
+            } elseif ($byte >= 161) {
+                $result .= mb_convert_encoding(chr($byte), 'UTF-8', 'ISO-8859-1');
+            } else {
+                $result .= self::CHAR_MAP[$byte];
+            }
+        }
+
+        return $result;
+    }
+}

tests/Unit/Document/Encoding/PDFDocEncodingTest.php

@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+
+namespace PrinsFrank\PdfParser\Tests\Unit\Document\Encoding;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\TestCase;
+use PrinsFrank\PdfParser\Document\Encoding\PDFDocEncoding;
+
+#[CoversClass(PDFDocEncoding::class)]
+class PDFDocEncodingTest extends TestCase {
+    public function testTextToUnicode(): void {
+        static::assertSame('a', PDFDocEncoding::textToUnicode('a')); // ASCII
+        static::assertSame('•', PDFDocEncoding::textToUnicode("\x80")); // Start of custom range
+        static::assertSame('�', PDFDocEncoding::textToUnicode("\x9f")); // Undefined in custom range
+        static::assertSame('€', PDFDocEncoding::textToUnicode("\xa0")); // addition in PDF 1.3, Table D.2
+        static::assertSame('¡', PDFDocEncoding::textToUnicode("\xa1")); // after custom range in ISO 8591-1
+        static::assertSame('ÿ', PDFDocEncoding::textToUnicode("\xff")); // end of ISO 8591-1
+    }
+}