Function binrw::file_ptr::parse_from_iter_with

pub fn parse_from_iter_with<Ptr, Value, Ret, Args, It, F, Reader>(
    it: It,
    parser: F,
) -> impl FnOnce(&mut Reader, Endian, Args) -> BinResult<Ret>
where
    Ptr: IntoSeekFrom,
    Ret: FromIterator<Value>,
    Args: Clone,
    It: IntoIterator<Item = Ptr>,
    F: Fn(&mut Reader, Endian, Args) -> BinResult<Value>,
    Reader: Read + Seek,

Creates a parser that reads a collection of values from an iterator of file offsets using the given parser function.

Offsets are treated as relative to the position of the reader when parsing begins. Use the seek_before directive to reposition the stream in this case.

See the module documentation for more information on how to use parse_from_iter_with.

Examples

#[derive(BinRead)]
#[br(big)]
struct Header {
    count: u16,

    #[br(args { count: count.into() })]
    offsets: Vec<u16>,
}

struct Item(u8);

#[derive(BinRead)]
#[br(big)]
struct Object {
    header: Header,
    #[br(parse_with = binrw::file_ptr::parse_from_iter_with(header.offsets.iter().copied(), |reader, endian, args| {
       u8::read_options(reader, endian, args).map(Item)
    }))]
    values: Vec<Item>,
}