Enum Buffer 

pub enum Buffer {
    VmoId(u64),
    Data(Vec<u8>),
    // some variants omitted
}

Data buffer. There are two supported ways data may be conveyed, corresponding to the two members of the Buffer union:

1. vmo_id: Pre-registered VMO. A driver may preregister VMOs using the fuchsia.hardware.usb.endpoint.Endpoint::RegisterVmos method. These VMOs are saved by the underlying USB driver in correspondence to the given vmo_id. Future Requests may refer to this by the unique vmo_id. Because VMOs are reused across Requests and saved by the underlying driver, each VMO only needs to be pinned/unpinned once.
2. data: A data buffer for data that is not associated with a VMO. The underlying USB driver should allocate its own VMO, copy the data from the buffer, and pin the VMO. This should not be used often and not for large amounts of data.

Variants

VmoId(u64)

The ID of a VMO that was previously registered.

Data(Vec<u8>)

Embedded data buffer to copy data to/from.

Implementations

impl Buffer

pub fn ordinal(&self) -> u64

pub fn unknown_variant_for_testing() -> Self

pub fn is_unknown(&self) -> bool

Trait Implementations

impl Debug for Buffer

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Decode<Buffer, DefaultFuchsiaResourceDialect> for Buffer

fn new_empty() -> Self

Creates a valid instance of Self. The specific value does not matter, since it will be overwritten by decode.

unsafe fn decode( &mut self, decoder: &mut Decoder<'_, DefaultFuchsiaResourceDialect>, offset: usize, depth: Depth, ) -> Result<()>

Decodes an object of type T from the decoder’s buffers into self.

impl Encode<Buffer, DefaultFuchsiaResourceDialect> for &mut Buffer

unsafe fn encode( self, encoder: &mut Encoder<'_, DefaultFuchsiaResourceDialect>, offset: usize, _depth: Depth, ) -> Result<()>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID.

impl PartialEq for Buffer

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl ResourceTypeMarker for Buffer

type Borrowed<'a> = &'a mut Buffer

The Rust type to use for encoding. This is a particular Encode<Self> type cheaply obtainable from &mut Self::Owned. There are three cases:

fn take_or_borrow<'a>( value: &'a mut <Self as TypeMarker>::Owned, ) -> Self::Borrowed<'a>

Cheaply converts from &mut Self::Owned to Self::Borrowed. For HandleBased types this is “take” (it returns an owned handle and replaces value with Handle::invalid), and for all other types it is “borrow” (just converts from one reference to another).

impl Standalone<DefaultFuchsiaResourceDialect> for Buffer

impl TypeMarker for Buffer

type Owned = Buffer

The owned Rust type which this FIDL type decodes into.

fn inline_align(_context: Context) -> usize

Returns the minimum required alignment of the inline portion of the encoded object. It must be a (nonzero) power of two.

fn inline_size(_context: Context) -> usize

Returns the size of the inline portion of the encoded object, including padding for alignment. Must be a multiple of inline_align.

fn encode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and encoding requires no validation. When true, we can optimize encoding arrays and vectors of Self::Owned to a single memcpy.

fn decode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and decoding requires no validation. When true, we can optimize decoding arrays and vectors of Self::Owned to a single memcpy.