1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158

use std::error::Error;
use std::fmt;
use std::io;
use std::string;

use decoder::ifd::{Tag, Value};
use decoder::{CompressionMethod, PhotometricInterpretation, PlanarConfiguration};
use ColorType;

/// Tiff error kinds.
#[derive(Debug)]
pub enum TiffError {
    /// The Image is not formatted properly
    FormatError(TiffFormatError),

    /// The Decoder does not support this image format
    UnsupportedError(TiffUnsupportedError),

    /// An I/O Error occurred while decoding the image
    IoError(io::Error),

    /// The Limits of the Decoder is exceeded,
    LimitsExceeded,
}

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum TiffFormatError {
    TiffSignatureNotFound,
    TiffSignatureInvalid,
    ImageFileDirectoryNotFound,
    InconsistentSizesEncountered,
    InvalidTag,
    RequiredTagNotFound(Tag),
    UnknownPredictor(u32),
    UnsignedIntegerExpected(Value),
}

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."),
            InvalidTag => write!(fmt, "Image contains invalid tag."),
            RequiredTagNotFound(ref tag) => write!(fmt, "Required tag `{:?}` not found.", tag),
            UnknownPredictor(ref predictor) => {
                write!(fmt, "Unknown predictor “{}” encountered", predictor)
            }
            UnsignedIntegerExpected(ref val) => {
                write!(fmt, "Expected unsigned integer, {:?} found.", val)
            }
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum TiffUnsupportedError {
    HorizontalPredictor(ColorType),
    InterpretationWithBits(PhotometricInterpretation, Vec<u8>),
    UnknownInterpretation,
    UnknownCompressionMethod,
    UnsupportedCompressionMethod(CompressionMethod),
    UnsupportedSampleDepth(u8),
    UnsupportedColorType(ColorType),
    UnsupportedBitsPerChannel(u8),
    UnsupportedPlanarConfig(Option<PlanarConfiguration>),
    UnsupportedDataType,
}

impl fmt::Display for TiffUnsupportedError {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        use self::TiffUnsupportedError::*;
        match *self {
            HorizontalPredictor(color_type) => write!(
                fmt,
                "Horizontal predictor for {:?} is unsupported.",
                color_type
            ),
            InterpretationWithBits(ref photometric_interpretation, ref bits_per_sample) => write!(
                fmt,
                "{:?} 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) => {
                write!(fmt, "{} samples per pixel is supported.", samples)
            }
            UnsupportedColorType(color_type) => {
                write!(fmt, "Color type {:?} is unsupported", color_type)
            }
            UnsupportedBitsPerChannel(bits) => {
                write!(fmt, "{} bits per channel not supported", bits)
            }
            UnsupportedPlanarConfig(config) => {
                write!(fmt, "Unsupported planar configuration “{:?}”.", config)
            }
            UnsupportedDataType => write!(fmt, "Unsupported data type."),
        }
    }
}

impl fmt::Display for TiffError {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        match *self {
            TiffError::FormatError(ref e) => write!(fmt, "Format error: {}", e),
            TiffError::UnsupportedError(ref f) => write!(
                fmt,
                "The Decoder does not support the \
                 image format `{}`",
                f
            ),
            TiffError::IoError(ref e) => e.fmt(fmt),
            TiffError::LimitsExceeded => write!(fmt, "The Decoder limits are exceeded"),
        }
    }
}

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",
        }
    }

    fn cause(&self) -> Option<&Error> {
        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<string::FromUtf8Error> for TiffError {
    fn from(_err: string::FromUtf8Error) -> TiffError {
        TiffError::FormatError(TiffFormatError::InvalidTag)
    }
}

/// Result of an image decoding/encoding process
pub type TiffResult<T> = Result<T, TiffError>;