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Add support for no-std usages of capnp crate.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| //! Custom I/O traits that roughly mirror `std::io::{Read, BufRead, Write}`. | ||
| //! This extra layer of indirection enables support of no-std environments. | ||
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| use crate::Result; | ||
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| pub trait Read { | ||
| fn read_exact(&mut self, buf: &mut [u8]) -> Result<()>; | ||
| } | ||
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| pub trait BufRead : Read { | ||
| fn fill_buf(&mut self) -> Result<&[u8]>; | ||
| fn consume(&mut self, amt: usize); | ||
| } | ||
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| pub trait Write { | ||
| fn write_all(&mut self, buf: &[u8]) -> Result<()>; | ||
| } | ||
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| #[cfg(feature="std")] | ||
| mod std_impls { | ||
| use crate::{Result}; | ||
| use crate::io::{Read, BufRead, Write}; | ||
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| impl <R> Read for R where R: std::io::Read { | ||
| fn read_exact(&mut self, buf: &mut [u8]) -> Result<()> { | ||
| std::io::Read::read_exact(self, buf)?; | ||
| Ok(()) | ||
| } | ||
| } | ||
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| impl <R> BufRead for R where R: std::io::BufRead { | ||
| fn fill_buf(&mut self) -> Result<&[u8]> { | ||
| Ok(std::io::BufRead::fill_buf(self)?) | ||
| } | ||
| fn consume(&mut self, amt: usize) { | ||
| std::io::BufRead::consume(self, amt) | ||
| } | ||
| } | ||
|
|
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| impl <W> Write for W where W: std::io::Write { | ||
| fn write_all(&mut self, buf: &[u8]) -> Result<()> { | ||
| std::io::Write::write_all(self, buf)?; | ||
| Ok(()) | ||
| } | ||
| } | ||
| } | ||
|
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| #[cfg(not(feature="std"))] | ||
| mod no_std_impls { | ||
| use alloc::string::ToString; | ||
| use crate::{Error, Result}; | ||
| use crate::io::{Read, BufRead, Write}; | ||
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| impl <'a> Write for &'a mut [u8] { | ||
| fn write_all(&mut self, buf: &[u8]) -> Result<()> { | ||
| if buf.len() > self.len() { | ||
| return Err(Error::failed("buffer is not large enough".to_string())); | ||
| } | ||
| let amt = buf.len(); | ||
| let (a, b) = core::mem::replace(self, &mut []).split_at_mut(amt); | ||
| a.copy_from_slice(buf); | ||
| *self = b; | ||
| Ok(()) | ||
| } | ||
| } | ||
|
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| impl Write for alloc::vec::Vec<u8> { | ||
| fn write_all(&mut self, buf: &[u8]) -> Result<()> { | ||
| self.extend_from_slice(buf); | ||
| Ok(()) | ||
| } | ||
| } | ||
|
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| impl <W: ?Sized> Write for &mut W where W: Write { | ||
| fn write_all(&mut self, buf: &[u8]) -> Result<()> { | ||
| (**self).write_all(buf) | ||
| } | ||
| } | ||
|
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| impl <'a> Read for &'a [u8] { | ||
| fn read_exact(&mut self, buf: &mut [u8]) -> Result<()> { | ||
| if buf.len() > self.len() { | ||
| return Err(Error::failed("buffer is not large enough".to_string())); | ||
| } | ||
| let (a, b) = self.split_at(buf.len()); | ||
| buf.copy_from_slice(a); | ||
| *self = b; | ||
| Ok(()) | ||
| } | ||
| } | ||
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| impl <R: ?Sized> Read for &mut R where R: Read { | ||
| fn read_exact(&mut self, buf: &mut [u8]) -> Result<()> { | ||
| (**self).read_exact(buf) | ||
| } | ||
| } | ||
|
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| impl <'a> BufRead for &'a [u8] { | ||
| fn fill_buf(&mut self) -> Result<&[u8]> { | ||
| Ok(*self) | ||
| } | ||
| fn consume(&mut self, amt: usize) { | ||
| *self = &self[amt..] | ||
| } | ||
| } | ||
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| impl <R: ?Sized> BufRead for &mut R where R: BufRead { | ||
| fn fill_buf(&mut self) -> Result<&[u8]> { | ||
| (**self).fill_buf() | ||
| } | ||
| fn consume(&mut self, amt: usize) { | ||
| (**self).consume(amt) | ||
| } | ||
| } | ||
| } |
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