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    //! Decoding and Encoding of TIFF Images
    //!
    //! TIFF (Tagged Image File Format) is a versatile image format that supports
    //! lossless and lossy compression.
    //!
    //! # Related Links
    //! * <http://partners.adobe.com/public/developer/tiff/index.html> - The TIFF specification

    extern crate tiff;

    use std::io::{Cursor, Read, Seek};

    use color::ColorType;
    use image::{ImageDecoder, ImageResult, ImageError};
    use utils::vec_u16_into_u8;

    /// Decoder for TIFF images.
    pub struct TIFFDecoder<R>
        where R: Read + Seek
    {
        dimensions: (u32, u32),
        colortype: ColorType,
        inner: tiff::decoder::Decoder<R>,
    }

    impl<R> TIFFDecoder<R>
        where R: Read + Seek
    {
        /// Create a new TIFFDecoder.
        pub fn new(r: R) -> Result<TIFFDecoder<R>, ImageError> {
            let mut inner = tiff::decoder::Decoder::new(r)?;
            let dimensions = inner.dimensions()?;
            let colortype = inner.colortype()?.into();

            Ok(TIFFDecoder {
                dimensions,
                colortype,
                inner,
            })
        }
    }

    impl From<tiff::TiffError> for ImageError {
        fn from(err: tiff::TiffError) -> ImageError {
            match err {
                tiff::TiffError::IoError(err) => ImageError::IoError(err),
                tiff::TiffError::FormatError(desc) => ImageError::FormatError(desc.to_string()),
                tiff::TiffError::UnsupportedError(desc) => ImageError::UnsupportedError(desc.to_string()),
            }
        }
    }

    impl From<tiff::ColorType> for ColorType {
        fn from(ct: tiff::ColorType) -> ColorType {
            match ct {
                tiff::ColorType::Gray(depth) => ColorType::Gray(depth),
                tiff::ColorType::RGB(depth) => ColorType::RGB(depth),
                tiff::ColorType::Palette(depth) => ColorType::Palette(depth),
                tiff::ColorType::GrayA(depth) => ColorType::GrayA(depth),
                tiff::ColorType::RGBA(depth) => ColorType::RGBA(depth),
                tiff::ColorType::CMYK(_) => unimplemented!()
            }
        }
    }

    impl<R: Read + Seek> ImageDecoder for TIFFDecoder<R> {
        type Reader = Cursor<Vec<u8>>;

        fn dimensions(&self) -> (u64, u64) {
            (self.dimensions.0 as u64, self.dimensions.1 as u64)
        }

        fn colortype(&self) -> ColorType {
            self.colortype
        }

        fn into_reader(self) -> ImageResult<Self::Reader> {
            Ok(Cursor::new(self.read_image()?))
        }

        fn read_image(mut self) -> ImageResult<Vec<u8>> {
            match self.inner.read_image()? {
                tiff::decoder::DecodingResult::U8(v) => Ok(v),
                tiff::decoder::DecodingResult::U16(v) => Ok(vec_u16_into_u8(v)),
            }
        }
    }

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