Struct trust_dns_proto::serialize::binary::BinDecoder

pub struct BinDecoder<'a> { /* fields omitted */ }

This is non-destructive to the inner buffer, b/c for pointer types we need to perform a reverse seek to lookup names

A note on serialization, there was a thought to have this implement the Serde deserializer, but given that this is such a small subset of all the serialization which that performs this is a simpler implementation without the cruft, at least for serializing to/from the binary DNS protocols.

Methods

impl<'a> BinDecoder<'a>

pub fn new(buffer: &'a [u8]) -> Self

Creates a new BinDecoder

Arguments

• buffer - buffer from which all data will be read

pub fn pop(&mut self) -> ProtoResult<u8>

Pop one byte from the buffer

pub fn len(&self) -> usize

Returns the number of bytes in the buffer

pub fn is_empty(&self) -> bool

Returns true if the buffer is empty

pub fn peek(&self) -> Option<u8>

Peed one byte forward, without moving the current index forward

pub fn index(&self) -> usize

Returns the current index in the buffer

pub fn clone(&self, index_at: u16) -> BinDecoder<'a>

This is a pretty efficient clone, as the buffer is never cloned, and only the index is set to the value passed in

pub fn read_character_data(&mut self) -> ProtoResult<&[u8]>

Reads a String from the buffer

<character-string> is a single
length octet followed by that number of characters.  <character-string>
is treated as binary information, and can be up to 256 characters in
length (including the length octet).

Returns

A String version of the character data

pub fn read_vec(&mut self, len: usize) -> ProtoResult<Vec<u8>>

Reads a Vec out of the buffer

Arguments

• len - number of bytes to read from the buffer

Returns

The Vec of the specified length, otherwise an error

pub fn read_slice(&mut self, len: usize) -> ProtoResult<&'a [u8]>

Reads a slice out of the buffer, without allocating

Arguments

• len - number of bytes to read from the buffer

Returns

The slice of the specified length, otherwise an error

pub fn slice_from(&self, index: usize) -> ProtoResult<&'a [u8]>

Reads a slice from a previous index to the current

pub fn read_u8(&mut self) -> ProtoResult<u8>

Reads a byte from the buffer, equivalent to Self::pop()

pub fn read_u16(&mut self) -> ProtoResult<u16>

Reads the next 2 bytes into u16

This performs a byte-by-byte manipulation, there which means endianness is implicitly handled (i.e. no network to little endian (intel), issues)

Return

Return the u16 from the buffer

pub fn read_i32(&mut self) -> ProtoResult<i32>

Reads the next four bytes into i32.

This performs a byte-by-byte manipulation, there which means endianness is implicitly handled (i.e. no network to little endian (intel), issues)

Return

Return the i32 from the buffer

pub fn read_u32(&mut self) -> ProtoResult<u32>

Reads the next four bytes into u32.

This performs a byte-by-byte manipulation, there which means endianness is implicitly handled (i.e. no network to little endian (intel), issues)

Return

Return the u32 from the buffer