Function write_ext_meta

src/encode.rs:753–799

Encodes and attempts to write the most efficient ext metadata 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. # Panics Panics if `typeid` is negative, because it is reserved for future MessagePack extension incl

(wr: &mut W, len: u32, typeid: i8)

/// Panics if `typeid` is negative, because it is reserved for future MessagePack extension
/// including 2-byte type information.
pub fn write_ext_meta<W>(wr: &mut W, len: u32, typeid: i8) -> Result<Marker, ValueWriteError>
    where W: Write
{
    assert!(typeid >= 0);

    let marker = match len {
        1 => {
            try!(write_marker(wr, Marker::FixExt1));
            Marker::FixExt1
        }
        2 => {
            try!(write_marker(wr, Marker::FixExt2));
            Marker::FixExt2
        }
        4 => {
            try!(write_marker(wr, Marker::FixExt4));
            Marker::FixExt4
        }
        8 => {
            try!(write_marker(wr, Marker::FixExt8));
            Marker::FixExt8
        }
        16 => {
            try!(write_marker(wr, Marker::FixExt16));
            Marker::FixExt16
        }
        len if len < 256 => {
            try!(write_marker(wr, Marker::Ext8));
            try!(write_data_u8(wr, len as u8));
            Marker::Ext8
        }
        len if len < 65536 => {
            try!(write_marker(wr, Marker::Ext16));
            try!(write_data_u16(wr, len as u16));
            Marker::Ext16
        }
        len => {
            try!(write_marker(wr, Marker::Ext32));
            try!(write_data_u32(wr, len));
            Marker::Ext32
        }
    };

    try!(write_data_i8(wr, typeid));

    Ok(marker)
}

pub mod value {