LibGfx/CCITT: Add PDF-specific options for CCITT3 1D

These two options are additions of the PDF specification. They are valid
for both 1D and 2D, but let's bail out if we encounter them in a 2D
image, as we don't have a test case yet.

Userland/Libraries/LibGfx/ImageFormats/CCITTDecoder.cpp

@@ -596,13 +596,19 @@ ErrorOr<ByteBuffer> decode_ccitt_group3(ReadonlyBytes bytes, u32 image_width, u3
         // NOTE: For whatever reason, the last EOL doesn't seem to be included
 
         for (u32 i = 0; i < image_height; ++i) {
-            TRY(read_eol(*bit_stream, options.use_fill_bits));
+            if (options.require_end_of_line == Group3Options::RequireEndOfLine::Yes)
+                TRY(read_eol(*bit_stream, options.use_fill_bits));
             TRY(decode_single_ccitt3_1d_line(*bit_stream, *decoded_bits, image_width));
+            if (options.encoded_byte_aligned == Group3Options::EncodedByteAligned::Yes)
+                bit_stream->align_to_byte_boundary();
         }
 
         return decoded_bytes;
     }
 
+    if (options.require_end_of_line == Group3Options::RequireEndOfLine::No || options.encoded_byte_aligned == Group3Options::EncodedByteAligned::Yes)
+        return Error::from_string_literal("CCITTDecoder: Unsupported option for CCITT3 2D decoding");
+
     TRY(decode_single_ccitt3_2d_block(*bit_stream, *decoded_bits, image_width, image_height, options.use_fill_bits));
     return decoded_bytes;
 }

Userland/Libraries/LibGfx/ImageFormats/CCITTDecoder.h

@@ -43,9 +43,24 @@ struct Group3Options {
         Yes = 1,
     };
 
+    // Addition from the PDF specification
+    enum class RequireEndOfLine : u8 {
+        No = 0,
+        Yes = 1,
+    };
+
+    enum class EncodedByteAligned : u8 {
+        No = 0,
+        Yes = 1,
+    };
+
     Mode dimensions = Mode::OneDimension;
     Compression compression = Compression::Compressed;
     UseFillBits use_fill_bits = UseFillBits::No;
+
+    // Default values are set to be compatible with the CCITT specification
+    RequireEndOfLine require_end_of_line = RequireEndOfLine::Yes;
+    EncodedByteAligned encoded_byte_aligned = EncodedByteAligned::No;
 };
 
 ErrorOr<ByteBuffer> decode_ccitt_group3(ReadonlyBytes bytes, u32 image_width, u32 image_height, Group3Options const& options);