Switch to quick_error and cleaner error messages (#269)

Cargo.toml

@@ -22,6 +22,7 @@ weezl = "0.1.0"
 jpeg = { package = "jpeg-decoder", version = "0.3.0", default-features = false }
 flate2 = "1.0.20"
 zstd = { version = "0.13", optional = true }
+quick-error = "2.0.1"
 
 [dev-dependencies]
 criterion = "0.3.1"

src/decoder/ifd.rs

@@ -42,15 +42,13 @@ impl Value {
     pub fn into_u8(self) -> TiffResult<u8> {
         match self {
             Byte(val) => Ok(val),
-            val => Err(TiffError::FormatError(TiffFormatError::ByteExpected(val))),
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
         }
     }
     pub fn into_i8(self) -> TiffResult<i8> {
         match self {
             SignedByte(val) => Ok(val),
-            val => Err(TiffError::FormatError(TiffFormatError::SignedByteExpected(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                val,
-            ))),
         }
     }
 
@@ -60,7 +58,7 @@ impl Value {
             Short(val) => Ok(val),
             Unsigned(val) => Ok(u16::try_from(val)?),
             UnsignedBig(val) => Ok(u16::try_from(val)?),
-            val => Err(TiffError::FormatError(TiffFormatError::ShortExpected(val))),
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
         }
     }
 
@@ -70,9 +68,7 @@ impl Value {
             SignedShort(val) => Ok(val),
             Signed(val) => Ok(i16::try_from(val)?),
             SignedBig(val) => Ok(i16::try_from(val)?),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::SignedShortExpected(val),
-            )),
         }
     }
 
@@ -84,9 +80,7 @@ impl Value {
             UnsignedBig(val) => Ok(u32::try_from(val)?),
             Ifd(val) => Ok(val),
             IfdBig(val) => Ok(u32::try_from(val)?),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::UnsignedIntegerExpected(val),
-            )),
         }
     }
 
@@ -96,9 +90,7 @@ impl Value {
             SignedShort(val) => Ok(val.into()),
             Signed(val) => Ok(val),
             SignedBig(val) => Ok(i32::try_from(val)?),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::SignedIntegerExpected(val),
-            )),
         }
     }
 
@@ -110,9 +102,7 @@ impl Value {
             UnsignedBig(val) => Ok(val),
             Ifd(val) => Ok(val.into()),
             IfdBig(val) => Ok(val),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::UnsignedIntegerExpected(val),
-            )),
         }
     }
 
@@ -122,36 +112,28 @@ impl Value {
             SignedShort(val) => Ok(val.into()),
             Signed(val) => Ok(val.into()),
             SignedBig(val) => Ok(val),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::SignedIntegerExpected(val),
-            )),
         }
     }
 
     pub fn into_f32(self) -> TiffResult<f32> {
         match self {
             Float(val) => Ok(val),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::SignedIntegerExpected(val),
-            )),
         }
     }
 
     pub fn into_f64(self) -> TiffResult<f64> {
         match self {
             Double(val) => Ok(val),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::SignedIntegerExpected(val),
-            )),
         }
     }
 
     pub fn into_string(self) -> TiffResult<String> {
         match self {
             Ascii(val) => Ok(val),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::SignedIntegerExpected(val),
-            )),
         }
     }
 
@@ -175,9 +157,7 @@ impl Value {
             Ifd(val) => Ok(vec![val]),
             IfdBig(val) => Ok(vec![u32::try_from(val)?]),
             Ascii(val) => Ok(val.chars().map(u32::from).collect()),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::UnsignedIntegerExpected(val),
-            )),
         }
     }
 
@@ -192,7 +172,7 @@ impl Value {
             }
             Byte(val) => Ok(vec![val]),
 
-            val => Err(TiffError::FormatError(TiffFormatError::ByteExpected(val))),
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
         }
     }
 
@@ -207,7 +187,7 @@ impl Value {
             }
             Byte(val) => Ok(vec![val.into()]),
             Short(val) => Ok(vec![val]),
-            val => Err(TiffError::FormatError(TiffFormatError::ShortExpected(val))),
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
         }
     }
 
@@ -238,9 +218,7 @@ impl Value {
             SRationalBig(numerator, denominator) => {
                 Ok(vec![i32::try_from(numerator)?, i32::try_from(denominator)?])
             }
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::SignedIntegerExpected(val),
-            )),
         }
     }
 
@@ -254,9 +232,7 @@ impl Value {
                 Ok(new_vec)
             }
             Float(val) => Ok(vec![val]),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::UnsignedIntegerExpected(val),
-            )),
         }
     }
 
@@ -270,9 +246,7 @@ impl Value {
                 Ok(new_vec)
             }
             Double(val) => Ok(vec![val]),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::UnsignedIntegerExpected(val),
-            )),
         }
     }
 
@@ -294,9 +268,7 @@ impl Value {
             Ifd(val) => Ok(vec![val.into()]),
             IfdBig(val) => Ok(vec![val]),
             Ascii(val) => Ok(val.chars().map(u32::from).map(u64::from).collect()),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::UnsignedIntegerExpected(val),
-            )),
         }
     }
 
@@ -325,9 +297,7 @@ impl Value {
             SignedBig(val) => Ok(vec![val]),
             SRational(numerator, denominator) => Ok(vec![numerator.into(), denominator.into()]),
             SRationalBig(numerator, denominator) => Ok(vec![numerator, denominator]),
-            val => Err(TiffError::FormatError(
+            _ => Err(TiffError::FormatError(TiffFormatError::InvalidTypeForTag)),
-                TiffFormatError::SignedIntegerExpected(val),
-            )),
         }
     }
 }

src/error.rs

@@ -1,14 +1,11 @@
-use std::error::Error;
-use std::fmt;
-use std::fmt::Display;
 use std::io;
 use std::str;
 use std::string;
-use std::sync::Arc;
 
 use jpeg::UnsupportedFeature;
+use quick_error::quick_error;
 
-use crate::decoder::{ifd::Value, ChunkType};
+use crate::decoder::ChunkType;
 use crate::tags::{
     CompressionMethod, PhotometricInterpretation, PlanarConfiguration, SampleFormat, Tag,
 };
@@ -16,302 +13,186 @@ use crate::ColorType;
 
 use crate::weezl::LzwError;
 
-/// Tiff error kinds.
+quick_error! {
-#[derive(Debug)]
+    /// Tiff error kinds.
-pub enum TiffError {
+    #[derive(Debug)]
+    pub enum TiffError {
         /// The Image is not formatted properly.
-    FormatError(TiffFormatError),
+        FormatError(err: TiffFormatError) {
-
+            display("format error: {err}")
+            from()
+            source(err)
+        }
         /// The Decoder does not support features required by the image.
-    UnsupportedError(TiffUnsupportedError),
+        UnsupportedError(err: TiffUnsupportedError) {
-
+            display("unsupported error: {err}")
+            from()
+            source(err)
+        }
         /// An I/O Error occurred while decoding the image.
-    IoError(io::Error),
+        IoError(err: io::Error) {
-
+            display("{err}")
+            from()
+            source(err)
+        }
         /// The Limits of the Decoder is exceeded.
-    LimitsExceeded,
+        LimitsExceeded {
-
+            display("decoder limits exceeded")
-    /// An integer conversion to or from a platform size failed, either due to
+        }
-    /// limits of the platform size or limits of the format.
+        /// An integer conversion to or from a platform size failed.
-    IntSizeError,
+        IntSizeError {
-
+            display("platform or format size limits exceeded")
+        }
         /// The image does not support the requested operation
-    UsageError(UsageError),
+        UsageError(err: UsageError) {
-}
+            display("usage error: {err}")
-
+            from()
-/// The image is not formatted properly.
+            source(err)
-///
-/// This indicates that the encoder producing the image might behave incorrectly or that the input
-/// file has been corrupted.
-///
-/// The list of variants may grow to incorporate errors of future features. Matching against this
-/// exhaustively is not covered by interface stability guarantees.
-#[derive(Debug, Clone, PartialEq)]
-#[non_exhaustive]
-pub enum TiffFormatError {
-    TiffSignatureNotFound,
-    TiffSignatureInvalid,
-    ImageFileDirectoryNotFound,
-    InconsistentSizesEncountered,
-    UnexpectedCompressedData {
-        actual_bytes: usize,
-        required_bytes: usize,
-    },
-    InconsistentStripSamples {
-        actual_samples: usize,
-        required_samples: usize,
-    },
-    InvalidDimensions(u32, u32),
-    InvalidTag,
-    InvalidTagValueType(Tag),
-    RequiredTagNotFound(Tag),
-    UnknownPredictor(u16),
-    UnknownPlanarConfiguration(u16),
-    ByteExpected(Value),
-    SignedByteExpected(Value),
-    ShortExpected(Value),
-    SignedShortExpected(Value),
-    UnsignedIntegerExpected(Value),
-    SignedIntegerExpected(Value),
-    Format(String),
-    RequiredTagEmpty(Tag),
-    StripTileTagConflict,
-    CycleInOffsets,
-    JpegDecoder(JpegDecoderError),
-    SamplesPerPixelIsZero,
-}
-
-impl fmt::Display for TiffFormatError {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-        use self::TiffFormatError::*;
-        match *self {
-            TiffSignatureNotFound => write!(fmt, "TIFF signature not found."),
-            TiffSignatureInvalid => write!(fmt, "TIFF signature invalid."),
-            ImageFileDirectoryNotFound => write!(fmt, "Image file directory not found."),
-            InconsistentSizesEncountered => write!(fmt, "Inconsistent sizes encountered."),
-            UnexpectedCompressedData {
-                actual_bytes,
-                required_bytes,
-            } => {
-                write!(
-                    fmt,
-                    "Decompression returned different amount of bytes than expected: got {}, expected {}.",
-                    actual_bytes, required_bytes
-                )
-            }
-            InconsistentStripSamples {
-                actual_samples,
-                required_samples,
-            } => {
-                write!(
-                    fmt,
-                    "Inconsistent elements in strip: got {}, expected {}.",
-                    actual_samples, required_samples
-                )
-            }
-            InvalidDimensions(width, height) => write!(fmt, "Invalid dimensions: {}x{}.", width, height),
-            InvalidTag => write!(fmt, "Image contains invalid tag."),
-            InvalidTagValueType(ref tag) => {
-                write!(fmt, "Tag `{:?}` did not have the expected value type.", tag)
-            }
-            RequiredTagNotFound(ref tag) => write!(fmt, "Required tag `{:?}` not found.", tag),
-            UnknownPredictor(ref predictor) => {
-                write!(fmt, "Unknown predictor “{}” encountered", predictor)
-            }
-            UnknownPlanarConfiguration(ref planar_config) =>  {
-                write!(fmt, "Unknown planar configuration “{}” encountered", planar_config)
-            }
-            ByteExpected(ref val) => write!(fmt, "Expected byte, {:?} found.", val),
-            SignedByteExpected(ref val) => write!(fmt, "Expected signed byte, {:?} found.", val),
-            ShortExpected(ref val) => write!(fmt, "Expected short, {:?} found.", val),
-            SignedShortExpected(ref val) => write!(fmt, "Expected signed short, {:?} found.", val),
-            UnsignedIntegerExpected(ref val) => {
-                write!(fmt, "Expected unsigned integer, {:?} found.", val)
-            }
-            SignedIntegerExpected(ref val) => {
-                write!(fmt, "Expected signed integer, {:?} found.", val)
-            }
-            Format(ref val) => write!(fmt, "Invalid format: {:?}.", val),
-            RequiredTagEmpty(ref val) => write!(fmt, "Required tag {:?} was empty.", val),
-            StripTileTagConflict => write!(fmt, "File should contain either (StripByteCounts and StripOffsets) or (TileByteCounts and TileOffsets), other combination was found."),
-            CycleInOffsets => write!(fmt, "File contained a cycle in the list of IFDs"),
-            JpegDecoder(ref error) => write!(fmt, "{}",  error),
-            SamplesPerPixelIsZero => write!(fmt, "Samples per pixel is zero"),
         }
     }
 }
 
-/// The Decoder does not support features required by the image.
+quick_error! {
-///
+    /// The image is not formatted properly.
-/// This only captures known failures for which the standard either does not require support or an
+    ///
-/// implementation has been planned but not yet completed. Some variants may become unused over
+    /// This indicates that the encoder producing the image might behave incorrectly or that the
-/// time and will then get deprecated before being removed.
+    /// input file has been corrupted.
-///
+    #[derive(Debug, Clone, PartialEq)]
-/// The list of variants may grow. Matching against this exhaustively is not covered by interface
+    #[non_exhaustive]
-/// stability guarantees.
+    pub enum TiffFormatError {
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+        TiffSignatureNotFound {
-#[non_exhaustive]
+            display("TIFF signature not found")
-pub enum TiffUnsupportedError {
-    FloatingPointPredictor(ColorType),
-    HorizontalPredictor(ColorType),
-    InconsistentBitsPerSample(Vec<u8>),
-    InterpretationWithBits(PhotometricInterpretation, Vec<u8>),
-    UnknownInterpretation,
-    UnknownCompressionMethod,
-    UnsupportedCompressionMethod(CompressionMethod),
-    UnsupportedSampleDepth(u8),
-    UnsupportedSampleFormat(Vec<SampleFormat>),
-    UnsupportedColorType(ColorType),
-    UnsupportedBitsPerChannel(u8),
-    UnsupportedPlanarConfig(Option<PlanarConfiguration>),
-    UnsupportedDataType,
-    UnsupportedInterpretation(PhotometricInterpretation),
-    UnsupportedJpegFeature(UnsupportedFeature),
-    MisalignedTileBoundaries,
-}
-
-impl fmt::Display for TiffUnsupportedError {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-        use self::TiffUnsupportedError::*;
-        match *self {
-            FloatingPointPredictor(color_type) => write!(
-                fmt,
-                "Floating point predictor for {:?} is unsupported.",
-                color_type
-            ),
-            HorizontalPredictor(color_type) => write!(
-                fmt,
-                "Horizontal predictor for {:?} is unsupported.",
-                color_type
-            ),
-            InconsistentBitsPerSample(ref bits_per_sample) => {
-                write!(fmt, "Inconsistent bits per sample: {:?}.", bits_per_sample)
         }
-            InterpretationWithBits(ref photometric_interpretation, ref bits_per_sample) => write!(
+        TiffSignatureInvalid {
-                fmt,
+            display("TIFF signature invalid")
-                "{:?} with {:?} bits per sample is unsupported",
-                photometric_interpretation, bits_per_sample
-            ),
-            UnknownInterpretation => write!(
-                fmt,
-                "The image is using an unknown photometric interpretation."
-            ),
-            UnknownCompressionMethod => write!(fmt, "Unknown compression method."),
-            UnsupportedCompressionMethod(method) => {
-                write!(fmt, "Compression method {:?} is unsupported", method)
         }
-            UnsupportedSampleDepth(samples) => {
+        ImageFileDirectoryNotFound {
-                write!(fmt, "{} samples per pixel is unsupported.", samples)
+            display("image file directory not found")
         }
-            UnsupportedSampleFormat(ref formats) => {
+        InconsistentSizesEncountered {
-                write!(fmt, "Sample format {:?} is unsupported.", formats)
+            display("inconsistent sizes encountered")
         }
-            UnsupportedColorType(color_type) => {
+        InvalidDimensions(width: u32, height: u32) {
-                write!(fmt, "Color type {:?} is unsupported", color_type)
+            display("invalid dimensions: {width}x{height}")
         }
-            UnsupportedBitsPerChannel(bits) => {
+        InvalidTag {
-                write!(fmt, "{} bits per channel not supported", bits)
+            display("image contains invalid tag")
         }
-            UnsupportedPlanarConfig(config) => {
+        InvalidTagValueType(tag: Tag) {
-                write!(fmt, "Unsupported planar configuration “{:?}”.", config)
+            display("tag `{tag:?}` did not have the expected value type")
         }
-            UnsupportedDataType => write!(fmt, "Unsupported data type."),
+        RequiredTagNotFound(tag: Tag) {
-            UnsupportedInterpretation(interpretation) => {
+            display("required tag `{tag:?}` not found")
-                write!(
-                    fmt,
-                    "Unsupported photometric interpretation \"{:?}\".",
-                    interpretation
-                )
         }
-            UnsupportedJpegFeature(ref unsupported_feature) => {
+        UnknownPredictor(pred: u16) {
-                write!(fmt, "Unsupported JPEG feature {:?}", unsupported_feature)
+            display("unknown predictor “{pred}” encountered")
         }
-            MisalignedTileBoundaries => write!(fmt, "Tile rows are not aligned to byte boundaries"),
+        UnknownPlanarConfiguration(cfg: u16) {
+            display("unknown planar configuration “{cfg}”")
+        }
+        InvalidTypeForTag {
+            display("tag has invalid type")
+        }
+        StripTileTagConflict {
+            display("file should contain either (StripByteCounts and StripOffsets) or (TileByteCounts and TileOffsets), other combination was found")
+        }
+        CycleInOffsets {
+            display("file contained a cycle in the list of IFDs")
+        }
+        SamplesPerPixelIsZero {
+            display("samples per pixel is zero")
+        }
+        CompressedDataCorrupt(message: String) {
+            display("compressed data is corrupt: {message}")
         }
     }
 }
 
-/// User attempted to use the Decoder in a way that is incompatible with a specific image.
+quick_error! {
-///
+    /// The Decoder does not support features required by the image.
-/// For example: attempting to read a tile from a stripped image.
+    ///
-#[derive(Debug)]
+    /// This only captures known failures for which the standard either does not require support or an
-pub enum UsageError {
+    /// implementation has been planned but not yet completed. Some variants may become unused over
-    InvalidChunkType(ChunkType, ChunkType),
+    /// time and will then get deprecated before being removed.
-    InvalidChunkIndex(u32),
+    #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-    PredictorCompressionMismatch,
+    #[non_exhaustive]
-    PredictorIncompatible,
+    pub enum TiffUnsupportedError {
-    PredictorUnavailable,
+        FloatingPointPredictor(color_type: ColorType) {
-}
+            display("floating point predictor for {color_type:?} is unsupported")
-
-impl fmt::Display for UsageError {
-    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        use self::UsageError::*;
-        match *self {
-            InvalidChunkType(expected, actual) => {
-                write!(
-                    fmt,
-                    "Requested operation is only valid for images with chunk encoding of type: {:?}, got {:?}.",
-                    expected, actual
-                )
         }
-            InvalidChunkIndex(index) => write!(fmt, "Image chunk index ({}) requested.", index),
+        HorizontalPredictor(color_type: ColorType) {
-            PredictorCompressionMismatch => write!(
+            display("horizontal predictor for {color_type:?} is unsupported")
-                fmt,
+        }
-                "The requested predictor is not compatible with the requested compression"
+        InconsistentBitsPerSample(bits_per_sample: Vec<u8>) {
-            ),
+            display("inconsistent bits per sample: {bits_per_sample:?}")
-            PredictorIncompatible => write!(
+        }
-                fmt,
+        InterpretationWithBits(interpretation: PhotometricInterpretation, bits_per_sample: Vec<u8>) {
-                "The requested predictor is not compatible with the image's format"
+            display("Photometric interpretation {interpretation:?} with bits per sample {bits_per_sample:?} is unsupported")
-            ),
+        }
-            PredictorUnavailable => write!(fmt, "The requested predictor is not available"),
+        UnknownInterpretation {
+            display("unknown photometric interpretation")
+        }
+        UnknownCompressionMethod {
+            display("unknown compression method")
+        }
+        UnsupportedCompressionMethod(method: CompressionMethod) {
+            display("compression method {method:?} is unsupported")
+        }
+        UnsupportedSampleDepth(depth: u8) {
+            display("{depth} samples per pixel is unsupported")
+        }
+        UnsupportedSampleFormat(sample_format: Vec<SampleFormat>) {
+            display("sample format {sample_format:?} is unsupported")
+        }
+        UnsupportedColorType(color_type: ColorType) {
+            display("color type {color_type:?} is unsupported")
+        }
+        UnsupportedBitsPerChannel(bits_per_channel: u8) {
+            display("{bits_per_channel} bits per channel not supported")
+        }
+        UnsupportedPlanarConfig(planar: Option<PlanarConfiguration>) {
+            display("unsupported planar configuration “{planar:?}”")
+        }
+        UnsupportedDataType {
+            display("unsupported data type.")
+        }
+        UnsupportedInterpretation(interpretation: PhotometricInterpretation) {
+            display("unsupported photometric interpretation \"{interpretation:?}\"")
+        }
+        UnsupportedJpegFeature(feature: UnsupportedFeature) {
+            display("unsupported JPEG feature {feature:?}")
+        }
+        MisalignedTileBoundaries {
+            display("tile rows are not aligned to byte boundaries")
         }
     }
 }
 
-impl fmt::Display for TiffError {
+quick_error! {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+    /// User attempted to use the Decoder in a way that is incompatible with a specific image.
-        match *self {
+    ///
-            TiffError::FormatError(ref e) => write!(fmt, "Format error: {}", e),
+    /// For example: attempting to read a tile from a stripped image.
-            TiffError::UnsupportedError(ref f) => write!(
+    #[derive(Debug)]
-                fmt,
+    #[non_exhaustive]
-                "The Decoder does not support the \
+    pub enum UsageError {
-                 image format `{}`",
+        InvalidChunkType(expected: ChunkType, actual: ChunkType) {
-                f
+            display("requested operation is only valid for images with chunk encoding of type {expected:?} but got {actual:?}")
-            ),
-            TiffError::IoError(ref e) => e.fmt(fmt),
-            TiffError::LimitsExceeded => write!(fmt, "The Decoder limits are exceeded"),
-            TiffError::IntSizeError => write!(fmt, "Platform or format size limits exceeded"),
-            TiffError::UsageError(ref e) => write!(fmt, "Usage error: {}", e),
         }
+        InvalidChunkIndex(index: u32) {
+            display("invalid chunk index ({index}) requested")
         }
-}
+        PredictorCompressionMismatch {
-
+            display("requested predictor is not compatible with the requested compression")
-impl Error for TiffError {
-    fn description(&self) -> &str {
-        match *self {
-            TiffError::FormatError(..) => "Format error",
-            TiffError::UnsupportedError(..) => "Unsupported error",
-            TiffError::IoError(..) => "IO error",
-            TiffError::LimitsExceeded => "Decoder limits exceeded",
-            TiffError::IntSizeError => "Platform or format size limits exceeded",
-            TiffError::UsageError(..) => "Invalid usage",
         }
+        PredictorIncompatible {
+            display("the requested predictor is not compatible with the image's format")
         }
-
+        PredictorUnavailable {
-    fn cause(&self) -> Option<&dyn Error> {
+            display("the requested predictor is not available")
-        match *self {
-            TiffError::IoError(ref e) => Some(e),
-            _ => None,
         }
     }
 }
 
-impl From<io::Error> for TiffError {
-    fn from(err: io::Error) -> TiffError {
-        TiffError::IoError(err)
-    }
-}
-
 impl From<str::Utf8Error> for TiffError {
     fn from(_err: str::Utf8Error) -> TiffError {
         TiffError::FormatError(TiffFormatError::InvalidTag)
@@ -324,24 +205,6 @@ impl From<string::FromUtf8Error> for TiffError {
     }
 }
 
-impl From<TiffFormatError> for TiffError {
-    fn from(err: TiffFormatError) -> TiffError {
-        TiffError::FormatError(err)
-    }
-}
-
-impl From<TiffUnsupportedError> for TiffError {
-    fn from(err: TiffUnsupportedError) -> TiffError {
-        TiffError::UnsupportedError(err)
-    }
-}
-
-impl From<UsageError> for TiffError {
-    fn from(err: UsageError) -> TiffError {
-        TiffError::UsageError(err)
-    }
-}
-
 impl From<std::num::TryFromIntError> for TiffError {
     fn from(_err: std::num::TryFromIntError) -> TiffError {
         TiffError::IntSizeError
@@ -350,48 +213,13 @@ impl From<std::num::TryFromIntError> for TiffError {
 
 impl From<LzwError> for TiffError {
     fn from(err: LzwError) -> TiffError {
-        match err {
+        TiffError::FormatError(TiffFormatError::CompressedDataCorrupt(err.to_string()))
-            LzwError::InvalidCode => TiffError::FormatError(TiffFormatError::Format(String::from(
-                "LZW compressed data corrupted",
-            ))),
-        }
-    }
-}
-
-#[derive(Debug, Clone)]
-pub struct JpegDecoderError {
-    inner: Arc<jpeg::Error>,
-}
-
-impl JpegDecoderError {
-    fn new(error: jpeg::Error) -> Self {
-        Self {
-            inner: Arc::new(error),
-        }
-    }
-}
-
-impl PartialEq for JpegDecoderError {
-    fn eq(&self, other: &Self) -> bool {
-        Arc::ptr_eq(&self.inner, &other.inner)
-    }
-}
-
-impl Display for JpegDecoderError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.inner.fmt(f)
-    }
-}
-
-impl From<JpegDecoderError> for TiffError {
-    fn from(error: JpegDecoderError) -> Self {
-        TiffError::FormatError(TiffFormatError::JpegDecoder(error))
     }
 }
 
 impl From<jpeg::Error> for TiffError {
-    fn from(error: jpeg::Error) -> Self {
+    fn from(err: jpeg::Error) -> Self {
-        JpegDecoderError::new(error).into()
+        TiffError::FormatError(TiffFormatError::CompressedDataCorrupt(err.to_string()))
     }
 }