60 lines
2.3 KiB
Rust
60 lines
2.3 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::io;
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use std::io::Read;
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use std::mem;
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use error::Error;
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use jpeg;
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use tiff;
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use tiff::Field;
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/// Parse the Exif attributes in a JPEG or TIFF image data.
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///
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/// Returns a Vec of Exif fields and a bool.
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/// The boolean value is true if the data is little endian.
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/// If an error occurred, `exif::Error` is returned.
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///
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/// The `buf` must be an empty `Vec<u8>` when this function is called.
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/// The raw Exif data is read into it.
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pub fn parse_image<'a, R>(mut reader: &mut R, mut buf: &'a mut Vec<u8>)
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-> Result<(Vec<Field<'a>>, bool), Error>
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where R: io::BufRead
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{
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try!(reader.by_ref().take(4).read_to_end(buf));
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if jpeg::is_jpeg(buf) {
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let exif_buf = try!(jpeg::get_exif_attr(
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&mut buf.as_mut_slice().chain(reader)));
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mem::replace(buf, exif_buf);
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} else if tiff::is_tiff(buf) {
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try!(reader.read_to_end(&mut buf));
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} else {
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return Err(Error::InvalidFormat("Unknown image format"));
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}
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tiff::parse_exif(buf)
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}
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