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use std::io::{Read, Write};
use self::EndianOption::*;
use self::LimitOption::*;
use super::{DefaultOptions, Options};
use de::read::BincodeRead;
use error::Result;
use serde;
/// A configuration builder whose options Bincode will use
/// while serializing and deserializing.
///
/// ### Options
/// Endianness: The endianness with which multi-byte integers will be read/written. *default: little endian*
/// Limit: The maximum number of bytes that will be read/written in a bincode serialize/deserialize. *default: unlimited*
///
/// ### Byte Limit Details
/// The purpose of byte-limiting is to prevent Denial-Of-Service attacks whereby malicious attackers get bincode
/// deserialization to crash your process by allocating too much memory or keeping a connection open for too long.
///
/// When a byte limit is set, bincode will return `Err` on any deserialization that goes over the limit, or any
/// serialization that goes over the limit.
#[derive(Clone, Debug)]
#[deprecated(
since = "1.3.0",
note = "please use the `DefaultOptions`/`Options` system instead"
)]
pub struct Config {
limit: LimitOption,
endian: EndianOption,
}
#[derive(Clone, Copy, Debug)]
enum LimitOption {
Unlimited,
Limited(u64),
}
#[derive(Clone, Copy, Debug)]
enum EndianOption {
Big,
Little,
Native,
}
macro_rules! config_map {
($self:expr, $opts:ident => $call:expr) => {
match ($self.limit, $self.endian) {
(Unlimited, Little) => {
let $opts = DefaultOptions::new()
.with_fixint_encoding()
.allow_trailing_bytes()
.with_no_limit()
.with_little_endian();
$call
}
(Unlimited, Big) => {
let $opts = DefaultOptions::new()
.with_fixint_encoding()
.allow_trailing_bytes()
.with_no_limit()
.with_big_endian();
$call
}
(Unlimited, Native) => {
let $opts = DefaultOptions::new()
.with_fixint_encoding()
.allow_trailing_bytes()
.with_no_limit()
.with_native_endian();
$call
}
(Limited(l), Little) => {
let $opts = DefaultOptions::new()
.with_fixint_encoding()
.allow_trailing_bytes()
.with_limit(l)
.with_little_endian();
$call
}
(Limited(l), Big) => {
let $opts = DefaultOptions::new()
.with_fixint_encoding()
.allow_trailing_bytes()
.with_limit(l)
.with_big_endian();
$call
}
(Limited(l), Native) => {
let $opts = DefaultOptions::new()
.with_fixint_encoding()
.allow_trailing_bytes()
.with_limit(l)
.with_native_endian();
$call
}
}
};
}
impl Config {
#[inline(always)]
pub(crate) fn new() -> Config {
Config {
limit: LimitOption::Unlimited,
endian: EndianOption::Little,
}
}
/// Sets the byte limit to be unlimited.
/// This is the default.
#[inline(always)]
pub fn no_limit(&mut self) -> &mut Self {
self.limit = LimitOption::Unlimited;
self
}
/// Sets the byte limit to `limit`.
#[inline(always)]
pub fn limit(&mut self, limit: u64) -> &mut Self {
self.limit = LimitOption::Limited(limit);
self
}
/// Sets the endianness to little-endian
/// This is the default.
#[inline(always)]
pub fn little_endian(&mut self) -> &mut Self {
self.endian = EndianOption::Little;
self
}
/// Sets the endianness to big-endian
#[inline(always)]
pub fn big_endian(&mut self) -> &mut Self {
self.endian = EndianOption::Big;
self
}
/// Sets the endianness to the the machine-native endianness
#[inline(always)]
pub fn native_endian(&mut self) -> &mut Self {
self.endian = EndianOption::Native;
self
}
/// Serializes a serializable object into a `Vec` of bytes using this configuration
#[inline(always)]
pub fn serialize<T: ?Sized + serde::Serialize>(&self, t: &T) -> Result<Vec<u8>> {
config_map!(self, opts => ::internal::serialize(t, opts))
}
/// Returns the size that an object would be if serialized using Bincode with this configuration
#[inline(always)]
pub fn serialized_size<T: ?Sized + serde::Serialize>(&self, t: &T) -> Result<u64> {
config_map!(self, opts => ::internal::serialized_size(t, opts))
}
/// Serializes an object directly into a `Writer` using this configuration
///
/// If the serialization would take more bytes than allowed by the size limit, an error
/// is returned and *no bytes* will be written into the `Writer`
#[inline(always)]
pub fn serialize_into<W: Write, T: ?Sized + serde::Serialize>(
&self,
w: W,
t: &T,
) -> Result<()> {
config_map!(self, opts => ::internal::serialize_into(w, t, opts))
}
/// Deserializes a slice of bytes into an instance of `T` using this configuration
#[inline(always)]
pub fn deserialize<'a, T: serde::Deserialize<'a>>(&self, bytes: &'a [u8]) -> Result<T> {
config_map!(self, opts => ::internal::deserialize(bytes, opts))
}
/// TODO: document
#[doc(hidden)]
#[inline(always)]
pub fn deserialize_in_place<'a, R, T>(&self, reader: R, place: &mut T) -> Result<()>
where
R: BincodeRead<'a>,
T: serde::de::Deserialize<'a>,
{
config_map!(self, opts => ::internal::deserialize_in_place(reader, opts, place))
}
/// Deserializes a slice of bytes with state `seed` using this configuration.
#[inline(always)]
pub fn deserialize_seed<'a, T: serde::de::DeserializeSeed<'a>>(
&self,
seed: T,
bytes: &'a [u8],
) -> Result<T::Value> {
config_map!(self, opts => ::internal::deserialize_seed(seed, bytes, opts))
}
/// Deserializes an object directly from a `Read`er using this configuration
///
/// If this returns an `Error`, `reader` may be in an invalid state.
#[inline(always)]
pub fn deserialize_from<R: Read, T: serde::de::DeserializeOwned>(
&self,
reader: R,
) -> Result<T> {
config_map!(self, opts => ::internal::deserialize_from(reader, opts))
}
/// Deserializes an object directly from a `Read`er with state `seed` using this configuration
///
/// If this returns an `Error`, `reader` may be in an invalid state.
#[inline(always)]
pub fn deserialize_from_seed<'a, R: Read, T: serde::de::DeserializeSeed<'a>>(
&self,
seed: T,
reader: R,
) -> Result<T::Value> {
config_map!(self, opts => ::internal::deserialize_from_seed(seed, reader, opts))
}
/// Deserializes an object from a custom `BincodeRead`er using the default configuration.
/// It is highly recommended to use `deserialize_from` unless you need to implement
/// `BincodeRead` for performance reasons.
///
/// If this returns an `Error`, `reader` may be in an invalid state.
#[inline(always)]
pub fn deserialize_from_custom<'a, R: BincodeRead<'a>, T: serde::de::DeserializeOwned>(
&self,
reader: R,
) -> Result<T> {
config_map!(self, opts => ::internal::deserialize_from_custom(reader, opts))
}
/// Deserializes an object from a custom `BincodeRead`er with state `seed` using the default
/// configuration. It is highly recommended to use `deserialize_from` unless you need to
/// implement `BincodeRead` for performance reasons.
///
/// If this returns an `Error`, `reader` may be in an invalid state.
#[inline(always)]
pub fn deserialize_from_custom_seed<
'a,
R: BincodeRead<'a>,
T: serde::de::DeserializeSeed<'a>,
>(
&self,
seed: T,
reader: R,
) -> Result<T::Value> {
config_map!(self, opts => ::internal::deserialize_from_custom_seed(seed, reader, opts))
}
}
|