123 lines
4.4 KiB
Rust
123 lines
4.4 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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//! This is a pure-Rust library to parse Exif data.
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//!
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//! This library parses Exif attributes in a raw Exif data block.
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//! It can also read Exif data directly from some image formats
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//! including TIFF, JPEG, HEIF, PNG, and WebP.
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//!
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//! # Examples
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//!
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//! To parse Exif attributes in an image file,
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//! use `Reader::read_from_container`.
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//! To convert a field value to a string, use `Field::display_value`.
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//!
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//! ```
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//! # fn main() -> Result<(), Box<dyn std::error::Error>> {
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//! for path in &["tests/exif.jpg", "tests/exif.tif"] {
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//! let file = std::fs::File::open(path)?;
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//! let mut bufreader = std::io::BufReader::new(&file);
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//! let exifreader = exif::Reader::new();
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//! let exif = exifreader.read_from_container(&mut bufreader)?;
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//! for f in exif.fields() {
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//! println!("{} {} {}",
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//! f.tag, f.ifd_num, f.display_value().with_unit(&exif));
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//! }
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//! }
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//! # Ok(()) }
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//! ```
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//!
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//! To process a field value programmatically in your application,
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//! use the value itself (associated value of enum `Value`)
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//! rather than a stringified one.
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//!
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//! ```
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//! # use exif::{In, Reader, Tag, Value};
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//! # let file = std::fs::File::open("tests/exif.tif").unwrap();
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//! # let exif = Reader::new().read_from_container(
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//! # &mut std::io::BufReader::new(&file)).unwrap();
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//! # macro_rules! eprintln { ($($tt:tt)*) => (panic!($($tt)*)) }
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//! // Orientation is stored as a SHORT. You could match `orientation.value`
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//! // against `Value::Short`, but the standard recommends that readers
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//! // should accept BYTE, SHORT, or LONG values for any unsigned integer
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//! // field. `Value::get_uint` is provided for that purpose.
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//! match exif.get_field(Tag::Orientation, In::PRIMARY) {
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//! Some(orientation) =>
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//! match orientation.value.get_uint(0) {
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//! Some(v @ 1..=8) => println!("Orientation {}", v),
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//! _ => eprintln!("Orientation value is broken"),
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//! },
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//! None => eprintln!("Orientation tag is missing"),
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//! }
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//! // XResolution is stored as a RATIONAL.
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//! match exif.get_field(Tag::XResolution, In::PRIMARY) {
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//! Some(xres) =>
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//! match xres.value {
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//! Value::Rational(ref v) if !v.is_empty() =>
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//! println!("XResolution {}", v[0]),
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//! _ => eprintln!("XResolution value is broken"),
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//! },
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//! None => eprintln!("XResolution tag is missing"),
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//! }
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//! ```
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//!
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//! # Upgrade Guide
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//!
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//! See the [upgrade guide](doc/upgrade/index.html) for API incompatibilities.
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pub use error::Error;
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pub use jpeg::get_exif_attr as get_exif_attr_from_jpeg;
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pub use reader::{Exif, Reader};
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pub use tag::{Context, Tag};
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pub use tiff::parse_exif_compat03 as parse_exif;
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pub use tiff::{DateTime, Field, In};
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pub use value::Value;
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pub use value::{Rational, SRational};
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/// The interfaces in this module are experimental and unstable.
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pub mod experimental {
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pub use crate::writer::Writer;
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}
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#[cfg(test)]
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#[macro_use]
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mod tmacro;
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pub mod doc;
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mod endian;
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mod error;
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mod isobmff;
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mod jpeg;
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mod png;
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mod reader;
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mod tag;
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mod tiff;
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mod util;
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mod value;
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mod webp;
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mod writer;
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