nextSequence

            fn nextSequence(
                self: *Decode,
                bit_reader: *ReverseBitReader,
            ) error{ InvalidBitStream, EndOfStream }!Sequence {
                const raw_code = self.getCode(.offset);
                const offset_code = std.math.cast(u5, raw_code) orelse {
                    return error.InvalidBitStream;
                };
                const offset_value = (@as(u32, 1) << offset_code) + try bit_reader.readBitsNoEof(u32, offset_code);

                const match_code = self.getCode(.match);
                if (match_code >= zstd.match_length_code_table.len)
                    return error.InvalidBitStream;
                const match = zstd.match_length_code_table[match_code];
                const match_length = match[0] + try bit_reader.readBitsNoEof(u32, match[1]);

                const literal_code = self.getCode(.literal);
                if (literal_code >= zstd.literals_length_code_table.len)
                    return error.InvalidBitStream;
                const literal = zstd.literals_length_code_table[literal_code];
                const literal_length = literal[0] + try bit_reader.readBitsNoEof(u32, literal[1]);

                const offset = if (offset_value > 3) offset: {
                    const offset = offset_value - 3;
                    self.updateRepeatOffset(offset);
                    break :offset offset;
                } else offset: {
                    if (literal_length == 0) {
                        if (offset_value == 3) {
                            const offset = self.repeat_offsets[0] - 1;
                            self.updateRepeatOffset(offset);
                            break :offset offset;
                        }
                        break :offset self.useRepeatOffset(offset_value);
                    }
                    break :offset self.useRepeatOffset(offset_value - 1);
                };

                if (offset == 0) return error.InvalidBitStream;

                return .{
                    .literal_length = literal_length,
                    .match_length = match_length,
                    .offset = offset,
                };
            }