84 lines
3.2 KiB
Rust
84 lines
3.2 KiB
Rust
//
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// Copyright (c) 2016 KAMADA Ken'ichi.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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// SUCH DAMAGE.
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//
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use std::error;
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use std::fmt;
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use std::io;
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/// An error returned when parsing of Exif data fails.
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#[derive(Debug)]
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#[non_exhaustive]
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pub enum Error {
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/// Input data was malformed or truncated.
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InvalidFormat(&'static str),
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/// Input data could not be read due to an I/O error and
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/// a `std::io::Error` value is associated with this variant.
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Io(io::Error),
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/// Exif attribute information was not found in an image file
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/// such as JPEG.
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NotFound(&'static str),
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/// The value of the field is blank. Some fields have blank values
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/// whose meanings are defined as "unknown". Such a blank value
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/// should be treated the same as the absence of the field.
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BlankValue(&'static str),
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/// Field values or image data are too big to encode.
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TooBig(&'static str),
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/// The field type is not supported and cannnot be encoded.
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NotSupported(&'static str),
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}
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impl From<io::Error> for Error {
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fn from(err: io::Error) -> Error {
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Error::Io(err)
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}
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}
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match *self {
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Error::InvalidFormat(msg) => f.write_str(msg),
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Error::Io(ref err) => err.fmt(f),
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Error::NotFound(ctn) => write!(f, "No Exif data found in {}", ctn),
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Error::BlankValue(msg) => f.write_str(msg),
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Error::TooBig(msg) => f.write_str(msg),
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Error::NotSupported(msg) => f.write_str(msg),
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}
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}
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}
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impl error::Error for Error {
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fn source(&self) -> Option<&(dyn error::Error + 'static)> {
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match *self {
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Error::InvalidFormat(_) => None,
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Error::Io(ref err) => Some(err),
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Error::NotFound(_) => None,
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Error::BlankValue(_) => None,
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Error::TooBig(_) => None,
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Error::NotSupported(_) => None,
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}
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}
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}
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