decode

    pub fn decode(in: *Reader, remaining: *Limit, buffer: []u8) DecodeError!LiteralsSection {
        const header = try Header.decode(in, remaining);
        switch (header.block_type) {
            .raw => {
                if (buffer.len < header.regenerated_size) return error.MalformedLiteralsSection;
                remaining.* = remaining.subtract(header.regenerated_size) orelse return error.EndOfStream;
                try in.readSliceAll(buffer[0..header.regenerated_size]);
                return .{
                    .header = header,
                    .huffman_tree = null,
                    .streams = .{ .one = buffer },
                };
            },
            .rle => {
                remaining.* = remaining.subtract(1) orelse return error.EndOfStream;
                buffer[0] = try in.takeByte();
                return .{
                    .header = header,
                    .huffman_tree = null,
                    .streams = .{ .one = buffer[0..1] },
                };
            },
            .compressed, .treeless => {
                const before_remaining = remaining.*;
                const huffman_tree = if (header.block_type == .compressed)
                    try HuffmanTree.decode(in, remaining)
                else
                    null;
                const huffman_tree_size = @backingInt(before_remaining) - @backingInt(remaining.*);
                const total_streams_size = std.math.sub(usize, header.compressed_size.?, huffman_tree_size) catch
                    return error.MalformedLiteralsSection;
                if (total_streams_size > buffer.len) return error.MalformedLiteralsSection;
                remaining.* = remaining.subtract(total_streams_size) orelse return error.EndOfStream;
                try in.readSliceAll(buffer[0..total_streams_size]);
                const stream_data = buffer[0..total_streams_size];
                const streams = try Streams.decode(header.size_format, stream_data);
                return .{
                    .header = header,
                    .huffman_tree = huffman_tree,
                    .streams = streams,
                };
            },
        }
    }