Improved error messages for inflate decompression

Cargo.toml

@@ -21,7 +21,7 @@ byteorder = "1.2"
 lzw = "0.10"
 num-derive = "0.3"
 num-traits = "0.2"
-miniz_oxide = "0.3" # TODO: Put behind a feature?
+miniz_oxide = "0.3"
 
 [dev-dependencies]
 tempfile = "3.0"

src/decoder/stream.rs

@@ -1,9 +1,10 @@
 //! All IO functionality needed for TIFF decoding
 
+use crate::error::TiffResult;
 use byteorder::{BigEndian, LittleEndian, ReadBytesExt};
 use lzw;
-use std::io::{self, Read, Seek};
 use miniz_oxide::inflate;
+use std::io::{self, Read, Seek};
 
 /// Byte order of the TIFF file.
 #[derive(Clone, Copy, Debug)]
@@ -75,15 +76,12 @@ pub struct DeflateReader {
 }
 
 impl DeflateReader {
-    pub fn new<R: Read + Seek>(
-        reader: &mut SmartReader<R>,
-    ) -> io::Result<(usize, Self)> {
+    pub fn new<R: Read + Seek>(reader: &mut SmartReader<R>) -> TiffResult<(usize, Self)> {
         let byte_order = reader.byte_order;
         let mut compressed = Vec::new();
         reader.read_to_end(&mut compressed)?;
-        let uncompressed = inflate::decompress_to_vec_zlib(&compressed).map_err(|error| {
-            std::io::Error::new(std::io::ErrorKind::InvalidData, format!("DEFLATE error: {:?}", error))
-        })?;
+        let uncompressed = inflate::decompress_to_vec_zlib(&compressed)?;
+
         Ok((
             uncompressed.len(),
             Self {

src/error.rs

@@ -5,6 +5,7 @@ use std::string;
 
 use decoder::ifd::{Tag, Value};
 use decoder::{CompressionMethod, PhotometricInterpretation, PlanarConfiguration};
+use miniz_oxide::inflate::TINFLStatus;
 use ColorType;
 
 /// Tiff error kinds.
@@ -34,6 +35,7 @@ pub enum TiffFormatError {
     UnknownPredictor(u32),
     UnsignedIntegerExpected(Value),
     SignedIntegerExpected(Value),
+    InflateError(InflateError),
 }
 
 impl fmt::Display for TiffFormatError {
@@ -55,10 +57,28 @@ impl fmt::Display for TiffFormatError {
             SignedIntegerExpected(ref val) => {
                 write!(fmt, "Expected signed integer, {:?} found.", val)
             }
+            InflateError(_) => write!(fmt, "Failed to decode inflate data."),
         }
     }
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct InflateError {
+    status: TINFLStatus,
+}
+
+impl From<TINFLStatus> for TiffFormatError {
+    fn from(status: TINFLStatus) -> Self {
+        TiffFormatError::InflateError(InflateError { status })
+    }
+}
+
+impl From<TINFLStatus> for TiffError {
+    fn from(status: TINFLStatus) -> Self {
+        TiffError::FormatError(status.into())
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum TiffUnsupportedError {
     HorizontalPredictor(ColorType),
@@ -138,7 +158,7 @@ impl Error for TiffError {
         }
     }
 
-    fn cause(&self) -> Option<& dyn Error> {
+    fn cause(&self) -> Option<&dyn Error> {
         match *self {
             TiffError::IoError(ref e) => Some(e),
             _ => None,