Struct trust_dns_proto::serialize::binary::BinEncoder

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pub struct BinEncoder<'a> { /* private fields */ }
Expand description

Encode DNS messages and resource record types.

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impl<'a> BinEncoder<'a>

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pub fn new(buf: &'a mut Vec<u8>) -> Self

Create a new encoder with the Vec to fill

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pub fn with_mode(buf: &'a mut Vec<u8>, mode: EncodeMode) -> Self

Specify the mode for encoding

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  • mode - In Signing mode, canonical forms of all data are encoded, otherwise format matches the source form
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pub fn with_offset(buf: &'a mut Vec<u8>, offset: u32, mode: EncodeMode) -> Self

Begins the encoder at the given offset

This is used for pointers. If this encoder is starting at some point further in the sequence of bytes, for the proper offset of the pointer, the offset accounts for that by using the offset to add to the pointer location being written.

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  • offset - index at which to start writing into the buffer
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pub fn set_max_size(&mut self, max: u16)

Sets the maximum size of the buffer

DNS message lens must be smaller than u16::max_value due to hard limits in the protocol

this method will move to the constructor in a future release

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pub fn into_bytes(self) -> &'a Vec<u8>

Returns a reference to the internal buffer

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pub fn len(&self) -> usize

Returns the length of the buffer

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pub fn is_empty(&self) -> bool

Returns true if the buffer is empty

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pub fn offset(&self) -> usize

Returns the current offset into the buffer

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pub fn set_offset(&mut self, offset: usize)

sets the current offset to the new offset

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pub fn mode(&self) -> EncodeMode

Returns the current Encoding mode

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pub fn set_canonical_names(&mut self, canonical_names: bool)

If set to true, then names will be written into the buffer in canonical form

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pub fn is_canonical_names(&self) -> bool

Returns true if then encoder is writing in canonical form

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pub fn with_canonical_names<F: FnOnce(&mut Self) -> ProtoResult<()>>( &mut self, f: F, ) -> ProtoResult<()>

Emit all names in canonical form, useful for https://tools.ietf.org/html/rfc3597

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pub fn reserve(&mut self, _additional: usize) -> ProtoResult<()>

Reserve specified additional length in the internal buffer.

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pub fn trim(&mut self)

trims to the current offset

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pub fn slice_of(&self, start: usize, end: usize) -> &[u8]

borrow a slice from the encoder

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pub fn store_label_pointer(&mut self, start: usize, end: usize)

Stores a label pointer to an already written label

The location is the current position in the buffer implicitly, it is expected that the name will be written to the stream after the current index.

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pub fn get_label_pointer(&self, start: usize, end: usize) -> Option<u16>

Looks up the index of an already written label

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pub fn emit(&mut self, b: u8) -> ProtoResult<()>

Emit one byte into the buffer

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pub fn emit_character_data<S: AsRef<[u8]>>( &mut self, char_data: S, ) -> ProtoResult<()>

matches description from above.

use trust_dns_proto::serialize::binary::BinEncoder;

let mut bytes: Vec<u8> = Vec::new();
{
  let mut encoder: BinEncoder = BinEncoder::new(&mut bytes);
  encoder.emit_character_data("abc");
}
assert_eq!(bytes, vec![3,b'a',b'b',b'c']);
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pub fn emit_character_data_unrestricted<S: AsRef<[u8]>>( &mut self, data: S, ) -> ProtoResult<()>

Emit character data of unrestricted length

Although character strings are typically restricted to being no longer than 255 characters, some modern standards allow longer strings to be encoded.

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pub fn emit_u8(&mut self, data: u8) -> ProtoResult<()>

Emit one byte into the buffer

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pub fn emit_u16(&mut self, data: u16) -> ProtoResult<()>

Writes a u16 in network byte order to the buffer

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pub fn emit_i32(&mut self, data: i32) -> ProtoResult<()>

Writes an i32 in network byte order to the buffer

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pub fn emit_u32(&mut self, data: u32) -> ProtoResult<()>

Writes an u32 in network byte order to the buffer

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pub fn emit_vec(&mut self, data: &[u8]) -> ProtoResult<()>

Writes the byte slice to the stream

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pub fn emit_all<'e, I: Iterator<Item = &'e E>, E: 'e + BinEncodable>( &mut self, iter: I, ) -> ProtoResult<usize>

Emits all the elements of an Iterator to the encoder

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pub fn emit_all_refs<'r, 'e, I, E>(&mut self, iter: I) -> ProtoResult<usize>
where I: Iterator<Item = &'r &'e E>, E: 'r + 'e + BinEncodable, 'e: 'r,

Emits all the elements of an Iterator to the encoder

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pub fn emit_iter<'e, I: Iterator<Item = &'e E>, E: 'e + BinEncodable>( &mut self, iter: &mut I, ) -> ProtoResult<usize>

emits all items in the iterator, return the number emitted

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pub fn place<T: EncodedSize>(&mut self) -> ProtoResult<Place<T>>

capture a location to write back to

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pub fn len_since_place<T: EncodedSize>(&self, place: &Place<T>) -> usize

calculates the length of data written since the place was creating

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pub fn emit_at<T: EncodedSize>( &mut self, place: Place<T>, data: T, ) -> ProtoResult<()>

write back to a previously captured location

Auto Trait Implementations§

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impl<'a> Freeze for BinEncoder<'a>

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impl<'a> RefUnwindSafe for BinEncoder<'a>

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impl<'a> Send for BinEncoder<'a>

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impl<'a> Sync for BinEncoder<'a>

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impl<'a> Unpin for BinEncoder<'a>

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impl<'a> !UnwindSafe for BinEncoder<'a>

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impl<T> Any for T
where T: 'static + ?Sized,

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