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//! Support types for other modules.
use core_foundation::string::CFString;
use core_foundation_sys::base::OSStatus;
use std::error;
use std::fmt;
use std::num::NonZeroI32;
use std::result;
/// A `Result` type commonly returned by functions.
pub type Result<T, E = Error> = result::Result<T, E>;
/// A Security Framework error.
#[derive(Copy, Clone)]
pub struct Error(NonZeroI32);
impl fmt::Debug for Error {
#[cold]
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut builder = fmt.debug_struct("Error");
builder.field("code", &self.0);
if let Some(message) = self.message() {
builder.field("message", &message);
}
builder.finish()
}
}
impl Error {
/// Creates a new `Error` from a status code.
/// The code must not be zero
#[inline]
#[must_use]
pub fn from_code(code: OSStatus) -> Self {
Self(NonZeroI32::new(code).unwrap_or_else(|| NonZeroI32::new(1).unwrap()))
}
/// Returns a string describing the current error, if available.
#[inline(always)]
#[must_use]
pub fn message(self) -> Option<String> {
self.inner_message()
}
#[cold]
fn inner_message(self) -> Option<String> {
use core_foundation::base::TCFType;
use security_framework_sys::base::SecCopyErrorMessageString;
use std::ptr;
unsafe {
let s = SecCopyErrorMessageString(self.code(), ptr::null_mut());
if s.is_null() {
None
} else {
Some(CFString::wrap_under_create_rule(s).to_string())
}
}
}
/// Returns the code of the current error.
#[inline(always)]
#[must_use]
pub fn code(self) -> OSStatus {
self.0.get() as _
}
}
impl From<OSStatus> for Error {
#[inline(always)]
#[must_use]
fn from(code: OSStatus) -> Self {
Self::from_code(code)
}
}
impl fmt::Display for Error {
#[cold]
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
if let Some(message) = self.message() {
write!(fmt, "{}", message)
} else {
write!(fmt, "error code {}", self.code())
}
}
}
impl error::Error for Error {}
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