//
// Copyright (c) 2016 KAMADA Ken'ichi.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//

extern crate exif;

use std::env;
use std::fmt::Write;
use std::fs::File;
use std::io::BufReader;
use std::path::{Path, PathBuf};

fn main() {
    for path in env::args_os().skip(1).map(PathBuf::from) {
        if let Err(e) = dump_file(&path) {
            println!("{}: {}", path.display(), e);
        }
    }
}

fn dump_file(path: &Path) -> Result<(), exif::Error> {
    let file = File::open(path)?;
    let reader = exif::Reader::read_from_container(
        &mut BufReader::new(&file))?;

    println!("{}", path.display());
    for f in reader.fields() {
        println!("  {}/{}: {}",
                 f.ifd_num.index(), f.tag,
                 f.display_value().with_unit(&reader));
        if let exif::Value::Ascii(ref v) = f.value {
            println!("      Ascii({:?})",
                     v.iter().map(|x| escape(x)).collect::<Vec<_>>());
        } else {
            println!("      {:?}", f.value);
        }
    }
    Ok(())
}

fn escape(bytes: &[u8]) -> String {
    let mut buf = String::new();
    for &c in bytes {
        match c {
            b'\\' | b'"' => write!(buf, "\\{}", c as char).unwrap(),
            0x20..=0x7e => buf.write_char(c as char).unwrap(),
            _ => write!(buf, "\\x{:02x}", c).unwrap(),
        }
    }
    buf
}