Function write_map_len

src/encode.rs:725–739

Encodes and attempts to write the most efficient map length implementation to the given write, returning the marker used. # Errors This function will return `ValueWriteError` on any I/O error occurred while writing either the marker or the data, except the EINTR, which is handled internally.

(wr: &mut W, len: u32)

/// This function will return `ValueWriteError` on any I/O error occurred while writing either the
/// marker or the data, except the EINTR, which is handled internally.
pub fn write_map_len<W>(wr: &mut W, len: u32) -> Result<Marker, ValueWriteError>
    where W: Write
{
    if len < 16 {
        let marker = Marker::FixMap(len as u8);
        try!(write_fixval(wr, marker));
        Ok(marker)
    } else if len < 65536 {
        try!(write_marker(wr, Marker::Map16));
        write_data_u16(wr, len as u16).and(Ok(Marker::Map16))
    } else {
        try!(write_marker(wr, Marker::Map32));
        write_data_u32(wr, len).and(Ok(Marker::Map32))
    }
}

/// Encodes and attempts to write the most efficient ext metadata implementation to the given
/// write, returning the marker used.