1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102

/*
 * Copyright (C) 2015 Benjamin Fry <benjaminfry@me.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

//! Binary serialization types

mod decoder;
mod encoder;
mod restrict;

pub use self::decoder::BinDecoder;
pub use self::encoder::BinEncoder;
pub use self::encoder::EncodeMode;
pub use self::restrict::{Restrict, RestrictedMath, Verified};

#[cfg(test)]
pub mod bin_tests;

use error::*;

/// A type which can be encoded into a DNS binary format
pub trait BinEncodable {
    /// Write the type to the stream
    fn emit(&self, encoder: &mut BinEncoder) -> ProtoResult<()>;

    /// Returns the object in binary form
    fn to_bytes(&self) -> ProtoResult<Vec<u8>> {
        let mut bytes = Vec::<u8>::new();
        {
            let mut encoder = BinEncoder::new(&mut bytes);
            self.emit(&mut encoder)?;
        }

        Ok(bytes)
    }
}

/// A trait for types which are serializable to and from DNS binary formats
pub trait BinDecodable<'r>: Sized {
    /// Read the type from the stream
    fn read(decoder: &mut BinDecoder<'r>) -> ProtoResult<Self>;

    /// Returns the object in binary form
    fn from_bytes(bytes: &'r [u8]) -> ProtoResult<Self> {
        let mut decoder = BinDecoder::new(bytes);
        Self::read(&mut decoder)
    }
}

impl BinEncodable for u16 {
    fn emit(&self, encoder: &mut BinEncoder) -> ProtoResult<()> {
        encoder.emit_u16(*self)
    }
}

impl<'r> BinDecodable<'r> for u16 {
    fn read(decoder: &mut BinDecoder) -> ProtoResult<Self> {
        decoder.read_u16().map(Restrict::unverified)
    }
}

impl BinEncodable for i32 {
    fn emit(&self, encoder: &mut BinEncoder) -> ProtoResult<()> {
        encoder.emit_i32(*self)
    }
}

impl<'r> BinDecodable<'r> for i32 {
    fn read(decoder: &mut BinDecoder) -> ProtoResult<i32> {
        decoder.read_i32().map(Restrict::unverified)
    }
}

impl BinEncodable for u32 {
    fn emit(&self, encoder: &mut BinEncoder) -> ProtoResult<()> {
        encoder.emit_u32(*self)
    }
}

impl<'r> BinDecodable<'r> for u32 {
    fn read(decoder: &mut BinDecoder) -> ProtoResult<Self> {
        decoder.read_u32().map(Restrict::unverified)
    }
}

impl BinEncodable for Vec<u8> {
    fn emit(&self, encoder: &mut BinEncoder) -> ProtoResult<()> {
        encoder.emit_vec(self)
    }
}