sgx_tstd/src/io/error.rs - incubator-teaclave-sgx-sdk - Git at Google

 // Licensed to the Apache Software Foundation (ASF) under one
 // or more contributor license agreements.  See the NOTICE file
 // distributed with this work for additional information
 // regarding copyright ownership.  The ASF licenses this file
 // to you 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..

 use crate::error;
 use crate::sys;
 use alloc_crate::boxed::Box;
 use alloc_crate::str;
 use core::convert::From;
 use core::fmt;
 use core::result;
 use sgx_types::sgx_status_t;

 /// A specialized [`Result`](../result/enum.Result.html) type for I/O
 /// operations.
 ///
 /// This type is broadly used across [`std::io`] for any operation which may
 /// produce an error.
 ///
 /// This typedef is generally used to avoid writing out [`io::Error`] directly and
 /// is otherwise a direct mapping to [`Result`].
 ///
 /// While usual Rust style is to import types directly, aliases of [`Result`]
 /// often are not, to make it easier to distinguish between them. [`Result`] is
 /// generally assumed to be [`std::result::Result`][`Result`], and so users of this alias
 /// will generally use `io::Result` instead of shadowing the prelude's import
 /// of [`std::result::Result`][`Result`].
 ///
 pub type Result<T> = result::Result<T, Error>;

 /// The error type for I/O operations of the [`Read`], [`Write`], [`Seek`], and
 /// associated traits.
 ///
 /// Errors mostly originate from the underlying OS, but custom instances of
 /// `Error` can be created with crafted error messages and a particular value of
 /// [`ErrorKind`].
 ///
 /// [`ErrorKind`]: enum.ErrorKind.html
 pub struct Error {
     repr: Repr,
 }

 impl fmt::Debug for Error {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         fmt::Debug::fmt(&self.repr, f)
     }
 }

 enum Repr {
     Os(i32),
     Simple(ErrorKind),
     Custom(Box<Custom>),
     SgxStatus(sgx_status_t),
 }

 #[derive(Debug)]
 struct Custom {
     kind: ErrorKind,
     error: Box<dyn error::Error + Send + Sync>,
 }

 /// A list specifying general categories of I/O error.
 ///
 /// This list is intended to grow over time and it is not recommended to
 /// exhaustively match against it.
 ///
 /// It is used with the [`io::Error`] type.
 ///
 /// [`io::Error`]: struct.Error.html
 #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
 #[allow(deprecated)]
 #[non_exhaustive]
 pub enum ErrorKind {
     /// An entity was not found, often a file.
     NotFound,
     /// The operation lacked the necessary privileges to complete.
     PermissionDenied,
     /// The connection was refused by the remote server.
     ConnectionRefused,
     /// The connection was reset by the remote server.
     ConnectionReset,
     /// The connection was aborted (terminated) by the remote server.
     ConnectionAborted,
     /// The network operation failed because it was not connected yet.
     NotConnected,
     /// A socket address could not be bound because the address is already in
     /// use elsewhere.
     AddrInUse,
     /// A nonexistent interface was requested or the requested address was not
     /// local.
     AddrNotAvailable,
     /// The operation failed because a pipe was closed.
     BrokenPipe,
     /// An entity already exists, often a file.
     AlreadyExists,
     /// The operation needs to block to complete, but the blocking operation was
     /// requested to not occur.
     WouldBlock,
     /// A parameter was incorrect.
     InvalidInput,
     /// Data not valid for the operation were encountered.
     ///
     /// Unlike [`InvalidInput`], this typically means that the operation
     /// parameters were valid, however the error was caused by malformed
     /// input data.
     ///
     /// For example, a function that reads a file into a string will error with
     /// `InvalidData` if the file's contents are not valid UTF-8.
     ///
     /// [`InvalidInput`]: #variant.InvalidInput
     InvalidData,
     /// The I/O operation's timeout expired, causing it to be canceled.
     TimedOut,
     /// An error returned when an operation could not be completed because a
     /// call to [`write`] returned [`Ok(0)`].
     ///
     /// This typically means that an operation could only succeed if it wrote a
     /// particular number of bytes but only a smaller number of bytes could be
     /// written.
     ///
     /// [`write`]: ../../std/io/trait.Write.html#tymethod.write
     /// [`Ok(0)`]: ../../std/io/type.Result.html
     WriteZero,
     /// This operation was interrupted.
     ///
     /// Interrupted operations can typically be retried.
     Interrupted,
     /// Any I/O error not part of this list.
     Other,

     /// An error returned when an operation could not be completed because an
     /// "end of file" was reached prematurely.
     ///
     /// This typically means that an operation could only succeed if it read a
     /// particular number of bytes but only a smaller number of bytes could be
     /// read.
     UnexpectedEof,

     ///
     /// SGX error status
     SgxError,
 }

 impl ErrorKind {
     pub(crate) fn as_str(&self) -> &'static str {
         match *self {
             ErrorKind::NotFound => "entity not found",
             ErrorKind::PermissionDenied => "permission denied",
             ErrorKind::ConnectionRefused => "connection refused",
             ErrorKind::ConnectionReset => "connection reset",
             ErrorKind::ConnectionAborted => "connection aborted",
             ErrorKind::NotConnected => "not connected",
             ErrorKind::AddrInUse => "address in use",
             ErrorKind::AddrNotAvailable => "address not available",
             ErrorKind::BrokenPipe => "broken pipe",
             ErrorKind::AlreadyExists => "entity already exists",
             ErrorKind::WouldBlock => "operation would block",
             ErrorKind::InvalidInput => "invalid input parameter",
             ErrorKind::InvalidData => "invalid data",
             ErrorKind::TimedOut => "timed out",
             ErrorKind::WriteZero => "write zero",
             ErrorKind::Interrupted => "operation interrupted",
             ErrorKind::Other => "other os error",
             ErrorKind::UnexpectedEof => "unexpected end of file",
             ErrorKind::SgxError => "Sgx error status",
         }
     }
 }

 /// Intended for use for errors not exposed to the user, where allocating onto
 /// the heap (for normal construction via Error::new) is too costly.
 impl From<ErrorKind> for Error {
     /// Converts an [`ErrorKind`] into an [`Error`].
     ///
     #[inline]
     fn from(kind: ErrorKind) -> Error {
         Error {
             repr: Repr::Simple(kind),
         }
     }
 }

 impl From<sgx_status_t> for Error {
     #[inline]
     fn from(status: sgx_status_t) -> Error {
         Error {
             repr: Repr::SgxStatus(status),
         }
     }
 }

 use sgx_libc::OCallError;
 impl From<OCallError> for Error {
     fn from(e: OCallError) -> Error {
         match e {
             OCallError::SgxError(status) => Error::from_sgx_error(status),
             OCallError::OsError(errno) => Error::from_raw_os_error(errno),
             OCallError::GaiError(errno) => Error::new(ErrorKind::Other, sgx_libc::gai_error_str(errno)),
             OCallError::CustomError(err) => Error::new(ErrorKind::Other, err),
         }
     }
 }

 impl Error {
     /// Creates a new I/O error from a known kind of error as well as an
     /// arbitrary error payload.
     ///
     /// This function is used to generically create I/O errors which do not
     /// originate from the OS itself. The `error` argument is an arbitrary
     /// payload which will be contained in this `Error`.
     ///
     pub fn new<E>(kind: ErrorKind, error: E) -> Error
     where
         E: Into<Box<dyn error::Error + Send + Sync>>,
     {
         Self::_new(kind, error.into())
     }

     fn _new(kind: ErrorKind, error: Box<dyn error::Error + Send + Sync>) -> Error {
         Error {
             repr: Repr::Custom(Box::new(Custom { kind, error })),
         }
     }

     /// Returns an error representing the last OS error which occurred.
     ///
     /// This function reads the value of `errno` for the target platform (e.g.
     /// `GetLastError` on Windows) and will return a corresponding instance of
     /// `Error` for the error code.
     ///
     pub fn last_os_error() -> Error {
         Error::from_raw_os_error(sys::os::errno() as i32)
     }

     /// Creates a new instance of an `Error` from a particular OS error code.
     ///
     pub fn from_raw_os_error(code: i32) -> Error {
         Error {
             repr: Repr::Os(code),
         }
     }

     /// Returns the OS error that this error represents (if any).
     ///
     /// If this `Error` was constructed via `last_os_error` or
     /// `from_raw_os_error`, then this function will return `Some`, otherwise
     /// it will return `None`.
     ///
     pub fn raw_os_error(&self) -> Option<i32> {
         match self.repr {
             Repr::Os(i) => Some(i),
             Repr::Custom(..) => None,
             Repr::Simple(..) => None,
             Repr::SgxStatus(..) => None,
         }
     }

     /// Creates a new instance of an `Error` from a particular SGX error status.
     ///
     pub fn from_sgx_error(status: sgx_status_t) -> Error {
         Error {
             repr: Repr::SgxStatus(status),
         }
     }

     /// Returns the SGX error that this error represents (if any).
     ///
     /// If this `Error` was constructed via `from_sgx_error` or
     /// then this function will return `Some`, otherwise
     /// it will return `None`.
     ///
     pub fn raw_sgx_error(&self) -> Option<sgx_status_t> {
         match self.repr {
             Repr::Os(..) => None,
             Repr::Custom(..) => None,
             Repr::Simple(..) => None,
             Repr::SgxStatus(status) => Some(status),
         }
     }

     /// Returns a reference to the inner error wrapped by this error (if any).
     ///
     /// If this `Error` was constructed via `new` then this function will
     /// return `Some`, otherwise it will return `None`.
     ///
     pub fn get_ref(&self) -> Option<&(dyn error::Error + Send + Sync + 'static)> {
         match self.repr {
             Repr::Os(..) => None,
             Repr::Simple(..) => None,
             Repr::Custom(ref c) => Some(&*c.error),
             Repr::SgxStatus(ref s) => Some(s),
         }
     }

     /// Returns a mutable reference to the inner error wrapped by this error
     /// (if any).
     ///
     /// If this `Error` was constructed via `new` then this function will
     /// return `Some`, otherwise it will return `None`.
     ///
     pub fn get_mut(&mut self) -> Option<&mut (dyn error::Error + Send + Sync + 'static)> {
         match self.repr {
             Repr::Os(..) => None,
             Repr::Simple(..) => None,
             Repr::Custom(ref mut c) => Some(&mut *c.error),
             Repr::SgxStatus(ref mut s) => Some(s),
         }
     }

     /// Consumes the `Error`, returning its inner error (if any).
     ///
     /// If this `Error` was constructed via `new` then this function will
     /// return `Some`, otherwise it will return `None`.
     ///
     pub fn into_inner(self) -> Option<Box<dyn error::Error + Send + Sync>> {
         match self.repr {
             Repr::Os(..) => None,
             Repr::Simple(..) => None,
             Repr::Custom(c) => Some(c.error),
             Repr::SgxStatus(s) => Some(Box::new(s)),
         }
     }

     /// Returns the corresponding `ErrorKind` for this error.
     ///
     pub fn kind(&self) -> ErrorKind {
         match self.repr {
             Repr::Os(code) => sys::decode_error_kind(code),
             Repr::Custom(ref c) => c.kind,
             Repr::Simple(kind) => kind,
             Repr::SgxStatus(..) => ErrorKind::SgxError,
         }
     }
 }

 impl fmt::Debug for Repr {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self {
             Repr::Os(code) => fmt
                 .debug_struct("Os")
                 .field("code", &code)
                 .field("kind", &sys::decode_error_kind(code))
                 .field("message", &sys::os::error_string(code))
                 .finish(),
             Repr::Custom(ref c) => fmt::Debug::fmt(&c, fmt),
             Repr::Simple(kind) => fmt.debug_tuple("Kind").field(&kind).finish(),
             Repr::SgxStatus(status) => fmt
                 .debug_struct("Sgx")
                 .field("code", &status)
                 .field("message", &status.__description())
                 .finish(),
         }
     }
 }

 impl fmt::Display for Error {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self.repr {
             Repr::Os(code) => {
                 let detail = sys::os::error_string(code);
                 write!(fmt, "{} (os error: {})", detail, code)
             }
             Repr::Custom(ref c) => c.error.fmt(fmt),
             Repr::Simple(kind) => write!(fmt, "{}", kind.as_str()),
             Repr::SgxStatus(status) => {
                 let detail = status.__description();
                 write!(fmt, "{} (sgx error: {})", detail, status)
             }
         }
     }
 }

 impl error::Error for Error {
     fn description(&self) -> &str {
         match self.repr {
             Repr::Os(..) | Repr::Simple(..) => self.kind().as_str(),
             Repr::Custom(ref c) => c.error.description(),
             Repr::SgxStatus(ref s) => s.description(),
         }
     }

     #[allow(deprecated)]
     fn cause(&self) -> Option<&dyn error::Error> {
         match self.repr {
             Repr::Os(..) => None,
             Repr::Simple(..) => None,
             Repr::Custom(ref c) => c.error.cause(),
             Repr::SgxStatus(ref s) => Some(s),
         }
     }

     fn source(&self) -> Option<&(dyn error::Error + 'static)> {
         match self.repr {
             Repr::Os(..) => None,
             Repr::Simple(..) => None,
             Repr::Custom(ref c) => c.error.source(),
             Repr::SgxStatus(ref s) => Some(s),
         }
     }
 }

 fn _assert_error_is_sync_send() {
     fn _is_sync_send<T: Sync + Send>() {}
     _is_sync_send::<Error>();
 }

 impl error::Error for sgx_status_t {
     fn description(&self) -> &str {
         self.__description()
     }
 }
	// Licensed to the Apache Software Foundation (ASF) under one
	// or more contributor license agreements. See the NOTICE file
	// distributed with this work for additional information
	// regarding copyright ownership. The ASF licenses this file
	// to you 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..

	use crate::error;
	use crate::sys;
	use alloc_crate::boxed::Box;
	use alloc_crate::str;
	use core::convert::From;
	use core::fmt;
	use core::result;
	use sgx_types::sgx_status_t;

	/// A specialized [`Result`](../result/enum.Result.html) type for I/O
	/// operations.
	///
	/// This type is broadly used across [`std::io`] for any operation which may
	/// produce an error.
	///
	/// This typedef is generally used to avoid writing out [`io::Error`] directly and
	/// is otherwise a direct mapping to [`Result`].
	///
	/// While usual Rust style is to import types directly, aliases of [`Result`]
	/// often are not, to make it easier to distinguish between them. [`Result`] is
	/// generally assumed to be [`std::result::Result`][`Result`], and so users of this alias
	/// will generally use `io::Result` instead of shadowing the prelude's import
	/// of [`std::result::Result`][`Result`].
	///
	pub type Result<T> = result::Result<T, Error>;

	/// The error type for I/O operations of the [`Read`], [`Write`], [`Seek`], and
	/// associated traits.
	///
	/// Errors mostly originate from the underlying OS, but custom instances of
	/// `Error` can be created with crafted error messages and a particular value of
	/// [`ErrorKind`].
	///
	/// [`ErrorKind`]: enum.ErrorKind.html
	pub struct Error {
	repr: Repr,
	}

	impl fmt::Debug for Error {
	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
	fmt::Debug::fmt(&self.repr, f)
	}
	}

	enum Repr {
	Os(i32),
	Simple(ErrorKind),
	Custom(Box<Custom>),
	SgxStatus(sgx_status_t),
	}

	#[derive(Debug)]
	struct Custom {
	kind: ErrorKind,
	error: Box<dyn error::Error + Send + Sync>,
	}

	/// A list specifying general categories of I/O error.
	///
	/// This list is intended to grow over time and it is not recommended to
	/// exhaustively match against it.
	///
	/// It is used with the [`io::Error`] type.
	///
	/// [`io::Error`]: struct.Error.html
	#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
	#[allow(deprecated)]
	#[non_exhaustive]
	pub enum ErrorKind {
	/// An entity was not found, often a file.
	NotFound,
	/// The operation lacked the necessary privileges to complete.
	PermissionDenied,
	/// The connection was refused by the remote server.
	ConnectionRefused,
	/// The connection was reset by the remote server.
	ConnectionReset,
	/// The connection was aborted (terminated) by the remote server.
	ConnectionAborted,
	/// The network operation failed because it was not connected yet.
	NotConnected,
	/// A socket address could not be bound because the address is already in
	/// use elsewhere.
	AddrInUse,
	/// A nonexistent interface was requested or the requested address was not
	/// local.
	AddrNotAvailable,
	/// The operation failed because a pipe was closed.
	BrokenPipe,
	/// An entity already exists, often a file.
	AlreadyExists,
	/// The operation needs to block to complete, but the blocking operation was
	/// requested to not occur.
	WouldBlock,
	/// A parameter was incorrect.
	InvalidInput,
	/// Data not valid for the operation were encountered.
	///
	/// Unlike [`InvalidInput`], this typically means that the operation
	/// parameters were valid, however the error was caused by malformed
	/// input data.
	///
	/// For example, a function that reads a file into a string will error with
	/// `InvalidData` if the file's contents are not valid UTF-8.
	///
	/// [`InvalidInput`]: #variant.InvalidInput
	InvalidData,
	/// The I/O operation's timeout expired, causing it to be canceled.
	TimedOut,
	/// An error returned when an operation could not be completed because a
	/// call to [`write`] returned [`Ok(0)`].
	///
	/// This typically means that an operation could only succeed if it wrote a
	/// particular number of bytes but only a smaller number of bytes could be
	/// written.
	///
	/// [`write`]: ../../std/io/trait.Write.html#tymethod.write
	/// [`Ok(0)`]: ../../std/io/type.Result.html
	WriteZero,
	/// This operation was interrupted.
	///
	/// Interrupted operations can typically be retried.
	Interrupted,
	/// Any I/O error not part of this list.
	Other,

	/// An error returned when an operation could not be completed because an
	/// "end of file" was reached prematurely.
	///
	/// This typically means that an operation could only succeed if it read a
	/// particular number of bytes but only a smaller number of bytes could be
	/// read.
	UnexpectedEof,

	///
	/// SGX error status
	SgxError,
	}

	impl ErrorKind {
	pub(crate) fn as_str(&self) -> &'static str {
	match *self {
	ErrorKind::NotFound => "entity not found",
	ErrorKind::PermissionDenied => "permission denied",
	ErrorKind::ConnectionRefused => "connection refused",
	ErrorKind::ConnectionReset => "connection reset",
	ErrorKind::ConnectionAborted => "connection aborted",
	ErrorKind::NotConnected => "not connected",
	ErrorKind::AddrInUse => "address in use",
	ErrorKind::AddrNotAvailable => "address not available",
	ErrorKind::BrokenPipe => "broken pipe",
	ErrorKind::AlreadyExists => "entity already exists",
	ErrorKind::WouldBlock => "operation would block",
	ErrorKind::InvalidInput => "invalid input parameter",
	ErrorKind::InvalidData => "invalid data",
	ErrorKind::TimedOut => "timed out",
	ErrorKind::WriteZero => "write zero",
	ErrorKind::Interrupted => "operation interrupted",
	ErrorKind::Other => "other os error",
	ErrorKind::UnexpectedEof => "unexpected end of file",
	ErrorKind::SgxError => "Sgx error status",
	}
	}
	}

	/// Intended for use for errors not exposed to the user, where allocating onto
	/// the heap (for normal construction via Error::new) is too costly.
	impl From<ErrorKind> for Error {
	/// Converts an [`ErrorKind`] into an [`Error`].
	///
	#[inline]
	fn from(kind: ErrorKind) -> Error {
	Error {
	repr: Repr::Simple(kind),
	}
	}
	}

	impl From<sgx_status_t> for Error {
	#[inline]
	fn from(status: sgx_status_t) -> Error {
	Error {
	repr: Repr::SgxStatus(status),
	}
	}
	}

	use sgx_libc::OCallError;
	impl From<OCallError> for Error {
	fn from(e: OCallError) -> Error {
	match e {
	OCallError::SgxError(status) => Error::from_sgx_error(status),
	OCallError::OsError(errno) => Error::from_raw_os_error(errno),
	OCallError::GaiError(errno) => Error::new(ErrorKind::Other, sgx_libc::gai_error_str(errno)),
	OCallError::CustomError(err) => Error::new(ErrorKind::Other, err),
	}
	}
	}

	impl Error {
	/// Creates a new I/O error from a known kind of error as well as an
	/// arbitrary error payload.
	///
	/// This function is used to generically create I/O errors which do not
	/// originate from the OS itself. The `error` argument is an arbitrary
	/// payload which will be contained in this `Error`.
	///
	pub fn new<E>(kind: ErrorKind, error: E) -> Error
	where
	E: Into<Box<dyn error::Error + Send + Sync>>,
	{
	Self::_new(kind, error.into())
	}

	fn _new(kind: ErrorKind, error: Box<dyn error::Error + Send + Sync>) -> Error {
	Error {
	repr: Repr::Custom(Box::new(Custom { kind, error })),
	}
	}

	/// Returns an error representing the last OS error which occurred.
	///
	/// This function reads the value of `errno` for the target platform (e.g.
	/// `GetLastError` on Windows) and will return a corresponding instance of
	/// `Error` for the error code.
	///
	pub fn last_os_error() -> Error {
	Error::from_raw_os_error(sys::os::errno() as i32)
	}

	/// Creates a new instance of an `Error` from a particular OS error code.
	///
	pub fn from_raw_os_error(code: i32) -> Error {
	Error {
	repr: Repr::Os(code),
	}
	}

	/// Returns the OS error that this error represents (if any).
	///
	/// If this `Error` was constructed via `last_os_error` or
	/// `from_raw_os_error`, then this function will return `Some`, otherwise
	/// it will return `None`.
	///
	pub fn raw_os_error(&self) -> Option<i32> {
	match self.repr {
	Repr::Os(i) => Some(i),
	Repr::Custom(..) => None,
	Repr::Simple(..) => None,
	Repr::SgxStatus(..) => None,
	}
	}

	/// Creates a new instance of an `Error` from a particular SGX error status.
	///
	pub fn from_sgx_error(status: sgx_status_t) -> Error {
	Error {
	repr: Repr::SgxStatus(status),
	}
	}

	/// Returns the SGX error that this error represents (if any).
	///
	/// If this `Error` was constructed via `from_sgx_error` or
	/// then this function will return `Some`, otherwise
	/// it will return `None`.
	///
	pub fn raw_sgx_error(&self) -> Option<sgx_status_t> {
	match self.repr {
	Repr::Os(..) => None,
	Repr::Custom(..) => None,
	Repr::Simple(..) => None,
	Repr::SgxStatus(status) => Some(status),
	}
	}

	/// Returns a reference to the inner error wrapped by this error (if any).
	///
	/// If this `Error` was constructed via `new` then this function will
	/// return `Some`, otherwise it will return `None`.
	///
	pub fn get_ref(&self) -> Option<&(dyn error::Error + Send + Sync + 'static)> {
	match self.repr {
	Repr::Os(..) => None,
	Repr::Simple(..) => None,
	Repr::Custom(ref c) => Some(&*c.error),
	Repr::SgxStatus(ref s) => Some(s),
	}
	}

	/// Returns a mutable reference to the inner error wrapped by this error
	/// (if any).
	///
	/// If this `Error` was constructed via `new` then this function will
	/// return `Some`, otherwise it will return `None`.
	///
	pub fn get_mut(&mut self) -> Option<&mut (dyn error::Error + Send + Sync + 'static)> {
	match self.repr {
	Repr::Os(..) => None,
	Repr::Simple(..) => None,
	Repr::Custom(ref mut c) => Some(&mut *c.error),
	Repr::SgxStatus(ref mut s) => Some(s),
	}
	}

	/// Consumes the `Error`, returning its inner error (if any).
	///
	/// If this `Error` was constructed via `new` then this function will
	/// return `Some`, otherwise it will return `None`.
	///
	pub fn into_inner(self) -> Option<Box<dyn error::Error + Send + Sync>> {
	match self.repr {
	Repr::Os(..) => None,
	Repr::Simple(..) => None,
	Repr::Custom(c) => Some(c.error),
	Repr::SgxStatus(s) => Some(Box::new(s)),
	}
	}

	/// Returns the corresponding `ErrorKind` for this error.
	///
	pub fn kind(&self) -> ErrorKind {
	match self.repr {
	Repr::Os(code) => sys::decode_error_kind(code),
	Repr::Custom(ref c) => c.kind,
	Repr::Simple(kind) => kind,
	Repr::SgxStatus(..) => ErrorKind::SgxError,
	}
	}
	}

	impl fmt::Debug for Repr {
	fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
	match *self {
	Repr::Os(code) => fmt
	.debug_struct("Os")
	.field("code", &code)
	.field("kind", &sys::decode_error_kind(code))
	.field("message", &sys::os::error_string(code))
	.finish(),
	Repr::Custom(ref c) => fmt::Debug::fmt(&c, fmt),
	Repr::Simple(kind) => fmt.debug_tuple("Kind").field(&kind).finish(),
	Repr::SgxStatus(status) => fmt
	.debug_struct("Sgx")
	.field("code", &status)
	.field("message", &status.__description())
	.finish(),
	}
	}
	}

	impl fmt::Display for Error {
	fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
	match self.repr {
	Repr::Os(code) => {
	let detail = sys::os::error_string(code);
	write!(fmt, "{} (os error: {})", detail, code)
	}
	Repr::Custom(ref c) => c.error.fmt(fmt),
	Repr::Simple(kind) => write!(fmt, "{}", kind.as_str()),
	Repr::SgxStatus(status) => {
	let detail = status.__description();
	write!(fmt, "{} (sgx error: {})", detail, status)
	}
	}
	}
	}

	impl error::Error for Error {
	fn description(&self) -> &str {
	match self.repr {
	Repr::Os(..) \| Repr::Simple(..) => self.kind().as_str(),
	Repr::Custom(ref c) => c.error.description(),
	Repr::SgxStatus(ref s) => s.description(),
	}
	}

	#[allow(deprecated)]
	fn cause(&self) -> Option<&dyn error::Error> {
	match self.repr {
	Repr::Os(..) => None,
	Repr::Simple(..) => None,
	Repr::Custom(ref c) => c.error.cause(),
	Repr::SgxStatus(ref s) => Some(s),
	}
	}

	fn source(&self) -> Option<&(dyn error::Error + 'static)> {
	match self.repr {
	Repr::Os(..) => None,
	Repr::Simple(..) => None,
	Repr::Custom(ref c) => c.error.source(),
	Repr::SgxStatus(ref s) => Some(s),
	}
	}
	}

	fn _assert_error_is_sync_send() {
	fn _is_sync_send<T: Sync + Send>() {}
	_is_sync_send::<Error>();
	}

	impl error::Error for sgx_status_t {
	fn description(&self) -> &str {
	self.__description()
	}
	}