Struct Http2Layer 

pub struct Http2Layer {
    pub index: LayerIndex,
    pub has_preface: bool,
}

HTTP/2 protocol layer view.

Represents one or more HTTP/2 frames within a packet buffer. The index covers the portion of the buffer from the start of the HTTP/2 data (preface or first frame header) to the end.

Note: A single Http2Layer may contain multiple frames. Use frames::parse_all_frames or Http2Layer::all_frames to iterate them.

Fields

index: LayerIndex

Layer boundary index within the packet buffer.

has_preface: bool

Whether the layer begins with the HTTP/2 client connection preface.

Implementations

impl Http2Layer

pub fn new(start: usize, end: usize, has_preface: bool) -> Self

Create a new HTTP/2 layer from start/end offsets and a preface flag.

pub fn from_index(index: LayerIndex, has_preface: bool) -> Self

Create from an existing LayerIndex.

pub fn has_preface_at(buf: &[u8], offset: usize) -> bool

Check if buf starting at offset begins with the HTTP/2 preface.

pub fn frames_start(&self) -> usize

Get the offset where frames begin (after the preface if present).

pub fn first_frame(&self, buf: &[u8]) -> Option<Http2Frame>

Get the first frame in this layer, skipping the preface if present.

Returns None if there are no frames or the buffer is too short.

pub fn all_frames(&self, buf: &[u8]) -> Vec<Http2Frame>

Parse all frames in this layer’s buffer range.

pub fn summary(&self, buf: &[u8]) -> String

Generate a human-readable summary for this layer.

pub fn header_len(&self, buf: &[u8]) -> usize

Get the “header length” of this layer.

This returns the number of bytes that constitute the “header” portion:

• If only a preface: 24 bytes
• If a frame (no preface): 9 bytes (one frame header)
• If preface + at least one frame: 33 bytes (24 + 9)

pub fn get_field( &self, buf: &[u8], name: &str, ) -> Option<Result<FieldValue, FieldError>>

Get a field value from the first frame by name.

Supported fields: frame_type, flags, stream_id, length.

pub fn set_field( &self, buf: &mut [u8], name: &str, value: FieldValue, ) -> Option<Result<(), FieldError>>

Set a field value by name.

Currently only stream_id supports mutation. Other fields require rebuilding the frame.

pub fn field_names() -> &'static [&'static str]

Get the static list of field names for this layer type.

Trait Implementations

impl Clone for Http2Layer

fn clone(&self) -> Http2Layer

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Http2Layer

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

Formats the value using the given formatter.

impl From<Http2Layer> for LayerEnum

fn from(v: Http2Layer) -> LayerEnum

Converts to this type from the input type.

impl Layer for Http2Layer

fn kind(&self) -> LayerKind

Get the kind of this layer

fn summary(&self, data: &[u8]) -> String

Get a human-readable summary of this layer

fn header_len(&self, data: &[u8]) -> usize

Get the header length for this layer

fn field_names(&self) -> &'static [&'static str]

Get the list of field names for this layer

fn hashret(&self, _data: &[u8]) -> Vec<u8>

Compute a hash for packet matching.

fn answers(&self, _data: &[u8], _other: &Self, _other_data: &[u8]) -> bool

Check if this packet answers another packet.

fn extract_padding<'a>(&self, data: &'a [u8]) -> (&'a [u8], &'a [u8])

Extract padding from the packet.

impl LayerDispatch for Http2Layer

fn dispatch_kind(&self) -> LayerKind

Get the kind of this layer.

fn dispatch_index(&self) -> &LayerIndex

Get the layer index (start/end offsets).

fn dispatch_summary(&self, buf: &[u8]) -> String

Get a human-readable summary.

fn dispatch_header_len(&self, buf: &[u8]) -> usize

Get the header length in bytes.

fn dispatch_hashret(&self, buf: &[u8]) -> Vec<u8>

Compute a hash for packet matching.

fn dispatch_field_names(&self) -> &'static [&'static str]

Get field names for this layer type.

fn dispatch_get_field( &self, buf: &[u8], name: &str, ) -> Option<Result<FieldValue, FieldError>>

Get a field value by name.

fn dispatch_set_field( &self, _buf: &mut [u8], _name: &str, _value: FieldValue, ) -> Option<Result<(), FieldError>>

Set a field value by name.

fn dispatch_show_fields(&self, buf: &[u8]) -> Vec<(&'static str, String)>

Get show-fields output.

impl TryInto<Http2Layer> for LayerEnum

type Error = &'static str

The type returned in the event of a conversion error.

fn try_into(self) -> Result<Http2Layer, <Self as TryInto<Http2Layer>>::Error>

Performs the conversion.