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// SPDX-License-Identifier: LGPL-3.0-or-later
/*
* libopenraw - identify.rs
*
* Copyright (C) 2022-2023 Hubert Figuière
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
//! Indentification of RAW files.
use std::collections::HashMap;
use std::io::{Read, Seek, SeekFrom};
use super::{Error, Result, Type};
use crate::fujifilm;
use crate::io::View;
use crate::tiff;
use crate::tiff::{exif, Ifd, IfdType};
lazy_static::lazy_static! {
/// Mapping of extensions (lowercase) to a `Type`.
pub(crate) static ref EXT_TO_TYPE: HashMap<&'static str, Type> = HashMap::from([
// The extension MUST be lowercase
("arw", Type::Arw),
("cr2", Type::Cr2),
("cr3", Type::Cr3),
("dng", Type::Dng),
("erf", Type::Erf),
("jpg", Type::Jpeg),
("jpeg", Type::Jpeg),
("gpr", Type::Gpr),
("nef", Type::Nef),
("nrw", Type::Nrw),
("orf", Type::Orf),
("pef", Type::Pef),
("raf", Type::Raf),
("raw", Type::Rw2),
("rw2", Type::Rw2),
("rwl", Type::Rw2),
("sr2", Type::Arw),
]);
}
/// Get the type associated to the extension.
/// `ext` must be lowercase ASCII.
pub(crate) fn type_for_extension(ext: &str) -> Option<Type> {
EXT_TO_TYPE.get(ext).cloned()
}
/// Return the `Type` based on the content of the file.
pub(crate) fn type_for_content(content: &mut View) -> Result<Option<Type>> {
use crate::Type::*;
// Buffer to read the content to identify
// Size is max of (14, RAF_MAGIC.len())
// Change as needed
let mut buf = [0_u8; 16];
let len = content.read(&mut buf)?;
if len <= 4 {
return Err(Error::BufferTooSmall);
}
if buf[0..4] == [0xff, 0xd8, 0xff, 0xdb] {
return Ok(Some(Jpeg));
}
if &buf[0..4] == b"\0MRM" {
return Ok(Some(Mrw));
}
if len >= 12 && &buf[4..12] == b"ftypcrx " {
return Ok(Some(Cr3));
}
if len >= 14 && &buf[0..14] == b"II\x1a\0\0\0HEAPCCDR" {
return Ok(Some(Crw));
}
if &buf[0..4] == b"IIRO" || &buf[0..4] == b"IIRS" {
return Ok(Some(Orf));
}
if &buf[0..4] == b"IIU\0" {
return Ok(Some(Rw2));
}
if len >= fujifilm::RAF_MAGIC.len() && &buf[0..fujifilm::RAF_MAGIC.len()] == fujifilm::RAF_MAGIC
{
return Ok(Some(Raf));
}
if &buf[0..4] == b"II\x2a\0" || &buf[0..4] == b"MM\0\x2a" {
// TIFF based format
if len >= 12 && &buf[8..11] == b"CR\x02" {
return Ok(Some(Cr2));
}
if len >= 8 {
content.seek(SeekFrom::Start(0))?;
let mut container =
tiff::Container::new(content.clone(), vec![(IfdType::Main, None)], Type::Unknown);
container.load(None)?;
if let Some(dir) = container.directory(0) {
if dir.entry(exif::TIFF_TAG_DNG_VERSION).is_some() {
return Ok(Some(Dng));
}
if let Some(make) = dir.value::<String>(exif::EXIF_TAG_MAKE) {
//let make = String::from_utf8_lossy(&bytes);
if make.contains("NIKON") {
return Ok(Some(Nef));
} else if &make == "SEIKO EPSON CORP." {
return Ok(Some(Erf));
} else if &make == "PENTAX Corporation " {
return Ok(Some(Pef));
} else if make.contains("SONY") {
return Ok(Some(Arw));
} else if &make == "Canon" {
return Ok(Some(Cr2));
}
}
}
}
}
Ok(None)
}
#[cfg(test)]
mod test {
#[test]
fn test_type_for_extension() {
use super::type_for_extension;
use crate::Type;
assert_eq!(type_for_extension("CR3"), None);
assert_eq!(type_for_extension("cr3"), Some(Type::Cr3));
assert_eq!(type_for_extension("NOPE"), None);
}
#[test]
fn test_type_for_content() {
use super::type_for_content;
use crate::{io, Error, Type};
use std::io::Cursor;
let four_bytes = Cursor::new([0_u8; 4].as_slice());
let viewer = io::Viewer::new(Box::new(four_bytes), 0);
let mut view = io::Viewer::create_view(&viewer, 0).expect("Couldn't create view");
assert!(matches!(
type_for_content(&mut view),
Err(Error::BufferTooSmall)
));
// Canon
let crw = Cursor::new(include_bytes!("../testdata/identify/content_crw").as_slice());
let viewer = io::Viewer::new(Box::new(crw), 0);
let mut view = io::Viewer::create_view(&viewer, 0).expect("Couldn't create view");
assert!(matches!(type_for_content(&mut view), Ok(Some(Type::Crw))));
let cr2 = Cursor::new(include_bytes!("../testdata/identify/content_cr2").as_slice());
let viewer = io::Viewer::new(Box::new(cr2), 0);
let mut view = io::Viewer::create_view(&viewer, 0).expect("Couldn't create view");
assert!(matches!(type_for_content(&mut view), Ok(Some(Type::Cr2))));
let cr3 = Cursor::new(include_bytes!("../testdata/identify/content_cr3").as_slice());
let viewer = io::Viewer::new(Box::new(cr3), 0);
let mut view = io::Viewer::create_view(&viewer, 0).expect("Couldn't create view");
assert!(matches!(type_for_content(&mut view), Ok(Some(Type::Cr3))));
let mrw = Cursor::new(include_bytes!("../testdata/identify/content_mrw").as_slice());
let viewer = io::Viewer::new(Box::new(mrw), 0);
let mut view = io::Viewer::create_view(&viewer, 0).expect("Couldn't create view");
assert!(matches!(type_for_content(&mut view), Ok(Some(Type::Mrw))));
let raf = Cursor::new(include_bytes!("../testdata/identify/content_raf").as_slice());
let viewer = io::Viewer::new(Box::new(raf), 0);
let mut view = io::Viewer::create_view(&viewer, 0).expect("Couldn't create view");
assert!(matches!(type_for_content(&mut view), Ok(Some(Type::Raf))));
}
}
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