1 files changed, 75 insertions, 0 deletions
diff --git a/vendor/jpeg-decoder/src/error.rs b/vendor/jpeg-decoder/src/error.rs
new file mode 100644
index 0000000..c5fe7b6
--- /dev/null
+++ b/vendor/jpeg-decoder/src/error.rs
@@ -0,0 +1,75 @@
+use alloc::boxed::Box;
+use alloc::fmt;
+use alloc::string::String;
+use core::result;
+use std::error::Error as StdError;
+use std::io::Error as IoError;
+
+use crate::ColorTransform;
+
+pub type Result<T> = result::Result<T, Error>;
+
+/// An enumeration over JPEG features (currently) unsupported by this library.
+///
+/// Support for features listed here may be included in future versions of this library.
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum UnsupportedFeature {
+    /// Hierarchical JPEG.
+    Hierarchical,
+    /// JPEG using arithmetic entropy coding instead of Huffman coding.
+    ArithmeticEntropyCoding,
+    /// Sample precision in bits. 8 bit sample precision is what is currently supported in non-lossless coding process.
+    SamplePrecision(u8),
+    /// Number of components in an image. 1, 3 and 4 components are currently supported.
+    ComponentCount(u8),
+    /// An image can specify a zero height in the frame header and use the DNL (Define Number of
+    /// Lines) marker at the end of the first scan to define the number of lines in the frame.
+    DNL,
+    /// Subsampling ratio.
+    SubsamplingRatio,
+    /// A subsampling ratio not representable as an integer.
+    NonIntegerSubsamplingRatio,
+    /// Colour transform
+    ColorTransform(ColorTransform),
+}
+
+/// Errors that can occur while decoding a JPEG image.
+#[derive(Debug)]
+pub enum Error {
+    /// The image is not formatted properly. The string contains detailed information about the
+    /// error.
+    Format(String),
+    /// The image makes use of a JPEG feature not (currently) supported by this library.
+    Unsupported(UnsupportedFeature),
+    /// An I/O error occurred while decoding the image.
+    Io(IoError),
+    /// An internal error occurred while decoding the image.
+    Internal(Box<dyn StdError + Send + Sync + 'static>), //TODO: not used, can be removed with the next version bump
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            Error::Format(ref desc) => write!(f, "invalid JPEG format: {}", desc),
+            Error::Unsupported(ref feat) => write!(f, "unsupported JPEG feature: {:?}", feat),
+            Error::Io(ref err) => err.fmt(f),
+            Error::Internal(ref err) => err.fmt(f),
+        }
+    }
+}
+
+impl StdError for Error {
+    fn source(&self) -> Option<&(dyn StdError + 'static)> {
+        match *self {
+            Error::Io(ref err) => Some(err),
+            Error::Internal(ref err) => Some(&**err),
+            _ => None,
+        }
+    }
+}
+
+impl From<IoError> for Error {
+    fn from(err: IoError) -> Error {
+        Error::Io(err)
+    }
+}