1 files changed, 136 insertions, 0 deletions
diff --git a/vendor/exr/src/error.rs b/vendor/exr/src/error.rs
new file mode 100644
index 0000000..4ab141f
--- /dev/null
+++ b/vendor/exr/src/error.rs
@@ -0,0 +1,136 @@
+
+//! Error type definitions.
+
+use std::borrow::Cow;
+use std::io::ErrorKind;
+pub use std::io::Error as IoError;
+pub use std::io::Result as IoResult;
+use std::convert::TryFrom;
+use std::error;
+use std::fmt;
+use std::num::TryFromIntError;
+
+
+// Export types
+
+/// A result that may contain an exr error.
+pub type Result<T> = std::result::Result<T, Error>;
+
+/// A result that, if ok, contains nothing, and otherwise contains an exr error.
+pub type UnitResult = Result<()>;
+
+
+/// An error that may happen while reading or writing an exr file.
+/// Distinguishes between three types of errors:
+/// unsupported features, invalid data, and file system errors.
+#[derive(Debug)]
+pub enum Error {
+
+    /// Reading or Writing the file has been aborted by the caller.
+    /// This error will never be triggered by this crate itself,
+    /// only by users of this library.
+    /// It exists to be returned from a progress callback.
+    Aborted, // FIXME remove?? is not used really?
+
+    /// The contents of the file are not supported by
+    /// this specific implementation of open exr,
+    /// even though the data may be valid.
+    NotSupported(Cow<'static, str>),
+
+    /// The contents of the image are contradicting or insufficient.
+    /// Also returned for `ErrorKind::UnexpectedEof` errors.
+    Invalid(Cow<'static, str>),
+
+    /// The underlying byte stream could not be read successfully,
+    /// probably due to file system related errors.
+    Io(IoError),
+}
+
+
+impl Error {
+
+    /// Create an error of the variant `Invalid`.
+    pub(crate) fn invalid(message: impl Into<Cow<'static, str>>) -> Self {
+        Error::Invalid(message.into())
+    }
+
+    /// Create an error of the variant `NotSupported`.
+    pub(crate) fn unsupported(message: impl Into<Cow<'static, str>>) -> Self {
+        Error::NotSupported(message.into())
+    }
+}
+
+/// Enable using the `?` operator on `std::io::Result`.
+impl From<IoError> for Error {
+    fn from(error: IoError) -> Self {
+        if error.kind() == ErrorKind::UnexpectedEof {
+            Error::invalid("reference to missing bytes")
+        }
+        else {
+            Error::Io(error)
+        }
+    }
+}
+
+// TODO use `usize::try_from(x)?` everywhere
+impl From<TryFromIntError> for Error {
+    fn from(_: TryFromIntError) -> Self {
+        Error::invalid("invalid size")
+    }
+}
+
+impl error::Error for Error {
+    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+        match *self {
+            Error::Io(ref err) => Some(err),
+            _ => None,
+        }
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Error::Io(err) => err.fmt(formatter),
+            Error::NotSupported(message) => write!(formatter, "not supported: {}", message),
+            Error::Invalid(message) => write!(formatter, "invalid: {}", message),
+            Error::Aborted => write!(formatter, "cancelled"),
+        }
+    }
+}
+
+/// Return error on invalid range.
+#[inline]
+pub(crate) fn i32_to_usize(value: i32, error_message: &'static str) -> Result<usize> {
+    usize::try_from(value).map_err(|_| Error::invalid(error_message))
+}
+
+/// Return error on invalid range.
+#[inline]
+pub(crate) fn usize_to_u16(value: usize) -> Result<u16> {
+    Ok(u16::try_from(value)?)
+}
+
+/// Panic on overflow.
+#[inline]
+pub(crate) fn u64_to_usize(value: u64) -> usize {
+    usize::try_from(value).expect("(u64 as usize) overflowed")
+}
+
+/// Panic on overflow.
+#[inline]
+pub(crate) fn u32_to_usize(value: u32) -> usize {
+    usize::try_from(value).expect("(u32 as usize) overflowed")
+}
+
+/// Panic on overflow.
+#[inline]
+pub(crate) fn usize_to_i32(value: usize) -> i32 {
+    i32::try_from(value).expect("(usize as i32) overflowed")
+}
+
+/// Panic on overflow.
+#[inline]
+pub(crate) fn usize_to_u64(value: usize) -> u64 {
+    u64::try_from(value).expect("(usize as u64) overflowed")
+}