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use core::{slice, fmt, ops}; use byteorder::ByteOrder; use serde::ser; pub trait Read<'de> { type Error: fmt::Display + fmt::Debug; fn read(&mut self, length: usize) -> Result<&'de [u8], Self::Error>; fn is(&self) -> Option<()>; } impl<'a, 'de, R> Read<'de> for &'a mut R where R: Read<'de>, { type Error = R::Error; fn read(&mut self, length: usize) -> Result<&'de [u8], Self::Error> { (&mut **self).read(length) } fn is(&self) -> Option<()> { (&**self).is() } } #[derive(Debug)] pub struct IterIoError { missing: ops::Range<usize>, } impl fmt::Display for IterIoError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "failed to read {}..{}", self.missing.start, self.missing.end) } } impl<'de> Read<'de> for slice::Iter<'de, u8> { type Error = IterIoError; fn read(&mut self, length: usize) -> Result<&'de [u8], Self::Error> { let limit = self.as_slice().len(); if limit < length { Err(IterIoError { missing: limit..length }) } else { let s = &self.as_slice()[0..length]; self.nth(length - 1); Ok(s) } } fn is(&self) -> Option<()> { if self.as_slice().len() != 0 { Some(()) } else { None } } } pub trait BinaryDeserializerDelegate { fn variant_size() -> usize; fn length_size() -> usize; fn sequence_length_size() -> usize; fn char_size() -> usize; fn decode_variant<E>(bytes: &[u8]) -> u32 where E: ByteOrder; fn decode_length<E>(bytes: &[u8]) -> usize where E: ByteOrder; fn decode_sequence_length<E>(bytes: &[u8]) -> Option<usize> where E: ByteOrder; fn decode_char<E>(bytes: &[u8]) -> Result<char, u32> where E: ByteOrder; } pub struct DefaultBinaryDeserializerDelegate; impl BinaryDeserializerDelegate for DefaultBinaryDeserializerDelegate { fn variant_size() -> usize { core::mem::size_of::<u32>() } fn length_size() -> usize { core::mem::size_of::<usize>() } fn sequence_length_size() -> usize { 0 } fn char_size() -> usize { core::mem::size_of::<u32>() } fn decode_variant<E>(bytes: &[u8]) -> u32 where E: ByteOrder { E::read_u32(bytes) } fn decode_length<E>(bytes: &[u8]) -> usize where E: ByteOrder { match Self::length_size() { 8 => E::read_u64(bytes) as usize, 4 => E::read_u32(bytes) as usize, _ => E::read_u16(bytes) as usize, } } fn decode_sequence_length<E>(bytes: &[u8]) -> Option<usize> where E: ByteOrder { let _ = bytes; None } fn decode_char<E>(bytes: &[u8]) -> Result<char, u32> where E: ByteOrder { let code = E::read_u32(bytes); core::char::from_u32(code).ok_or(code) } } pub trait Write { type Error: fmt::Display + fmt::Debug; fn write(&mut self, bytes: &[u8]) -> Result<(), Self::Error>; } impl<'de> Write for slice::IterMut<'de, u8> { type Error = IterIoError; fn write(&mut self, bytes: &[u8]) -> Result<(), Self::Error> { use core::mem; let limit = self.size_hint().0; let length = bytes.len(); if limit < length { Err(IterIoError { missing: limit..length }) } else { let mut temp = (&mut []).iter_mut(); mem::swap(&mut temp, self); let slice = temp.into_slice(); slice.copy_from_slice(bytes); *self = slice[length..].iter_mut(); Ok(()) } } } pub trait BinarySerializerDelegate { type Variant: ser::Serialize; type Length: ser::Serialize; type SequenceLength: ser::Serialize; type Char: ser::Serialize; fn encode_variant(v: u32) -> Self::Variant; fn encode_length(v: usize) -> Self::Length; fn encode_sequence_length(v: usize) -> Self::SequenceLength; fn encode_char(v: char) -> Self::Char; } pub struct DefaultBinarySerializerDelegate; impl BinarySerializerDelegate for DefaultBinarySerializerDelegate { type Variant = u32; type Length = usize; type SequenceLength = usize; type Char = u32; fn encode_variant(v: u32) -> Self::Variant { v } fn encode_length(v: usize) -> Self::Length { v } fn encode_sequence_length(v: usize) -> Self::SequenceLength { v } fn encode_char(v: char) -> Self::Char { v as _ } } #[cfg(feature = "use_std")] pub use self::with_std::WriteWrapper; #[cfg(feature = "use_std")] mod with_std { use super::Write; use std::io; pub struct WriteWrapper<T> where T: io::Write, { raw: T, } impl<T> From<T> for WriteWrapper<T> where T: io::Write, { fn from(v: T) -> Self { WriteWrapper { raw: v } } } impl<T> WriteWrapper<T> where T: io::Write, { pub fn into_inner(self) -> T { self.raw } } impl<T> Write for WriteWrapper<T> where T: io::Write, { type Error = io::Error; fn write(&mut self, bytes: &[u8]) -> Result<(), Self::Error> { io::Write::write_all(&mut self.raw, bytes) } } }