LibTextCodec: Add PDFDocEncoding decoder

Userland/Libraries/LibTextCodec/Decoder.cpp

@@ -26,6 +26,7 @@ CyrillicDecoder s_cyrillic_decoder;
 Koi8RDecoder s_koi8r_decoder;
 Latin9Decoder s_latin9_decoder;
 MacRomanDecoder s_mac_roman_decoder;
+PDFDocEncodingDecoder s_pdf_doc_encoding_decoder;
 TurkishDecoder s_turkish_decoder;
 XUserDefinedDecoder s_x_user_defined_decoder;
 }
@@ -54,6 +55,8 @@ Optional<Decoder&> decoder_for(StringView a_encoding)
             return s_latin9_decoder;
         if (encoding.value().equals_ignoring_ascii_case("macintosh"sv))
             return s_mac_roman_decoder;
+        if (encoding.value().equals_ignoring_ascii_case("PDFDocEncoding"sv))
+            return s_pdf_doc_encoding_decoder;
         if (encoding.value().equals_ignoring_ascii_case("windows-1254"sv))
             return s_turkish_decoder;
         if (encoding.value().equals_ignoring_ascii_case("x-user-defined"sv))
@@ -104,6 +107,8 @@ Optional<StringView> get_standardized_encoding(StringView encoding)
         return "KOI8-U"sv;
     if (encoding.is_one_of_ignoring_ascii_case("csmacintosh"sv, "mac"sv, "macintosh"sv, "x-mac-roman"sv))
         return "macintosh"sv;
+    if (encoding.is_one_of_ignoring_ascii_case("pdfdocencoding"sv))
+        return "PDFDocEncoding"sv;
     if (encoding.is_one_of_ignoring_ascii_case("dos-874"sv, "iso-8859-11"sv, "iso8859-11"sv, "iso885911"sv, "tis-620"sv, "windows-874"sv))
         return "windows-874"sv;
     if (encoding.is_one_of_ignoring_ascii_case("cp1250"sv, "windows-1250"sv, "x-cp1250"sv))
@@ -645,6 +650,53 @@ ErrorOr<void> MacRomanDecoder::process(StringView input, Function<ErrorOr<void>(
     return {};
 }
 
+ErrorOr<void> PDFDocEncodingDecoder::process(StringView input, Function<ErrorOr<void>(u32)> on_code_point)
+{
+    // PDF 1.7 spec, Appendix D.2 "PDFDocEncoding Character Set"
+    // Character codes 0-8, 11-12, 14-23, 127, 159, 173 are not defined per spec.
+    // clang-format off
+    static constexpr Array<u32, 256> translation_table = {
+        0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
+        0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F,
+        0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0017, 0x0017,
+        0x02D8, 0x02C7, 0x02C6, 0x02D9, 0x02DD, 0x02DB, 0x02DA, 0x02DC,
+        0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
+        0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,
+        0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
+        0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
+        0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
+        0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,
+        0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
+        0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,
+        0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
+        0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
+        0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
+        0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0xFFFC,
+        0x2022, 0x2020, 0x2021, 0x2026, 0x2014, 0x2013, 0x0192, 0x2044,
+        0x2039, 0x203A, 0x2212, 0x2030, 0x201E, 0x201C, 0x201D, 0x2018,
+        0x2019, 0x201A, 0x2122, 0xFB01, 0xFB02, 0x0141, 0x0152, 0x0160,
+        0x0178, 0x017D, 0x0131, 0x0142, 0x0153, 0x0161, 0x017E, 0xFFFC,
+        0x20AC, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
+        0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0xFFFC, 0x00AE, 0x00AF,
+        0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
+        0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF,
+        0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7,
+        0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
+        0x00D0, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
+        0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00DE, 0x00DF,
+        0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
+        0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
+        0x00F0, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
+        0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x00FF,
+    };
+    // clang-format on
+
+    for (u8 ch : input)
+        TRY(on_code_point(translation_table[ch]));
+
+    return {};
+}
+
 ErrorOr<void> TurkishDecoder::process(StringView input, Function<ErrorOr<void>(u32)> on_code_point)
 {
     auto convert_turkish_to_utf8 = [](u8 ch) -> u32 {

Userland/Libraries/LibTextCodec/Decoder.h

@@ -81,6 +81,11 @@ public:
     virtual ErrorOr<void> process(StringView, Function<ErrorOr<void>(u32)> on_code_point) override;
 };
 
+class PDFDocEncodingDecoder final : public Decoder {
+public:
+    virtual ErrorOr<void> process(StringView, Function<ErrorOr<void>(u32)> on_code_point) override;
+};
+
 class TurkishDecoder final : public Decoder {
 public:
     virtual ErrorOr<void> process(StringView, Function<ErrorOr<void>(u32)> on_code_point) override;