529 lines
19 KiB
Rust
529 lines
19 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::fmt;
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use crate::endian::{Endian, BigEndian, LittleEndian};
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use crate::error::Error;
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use crate::tag::{Context, Tag, UnitPiece};
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use crate::value;
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use crate::value::Value;
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use crate::value::get_type_info;
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use crate::util::{atou16, ctou32};
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// TIFF header magic numbers [EXIF23 4.5.2].
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const TIFF_BE: u16 = 0x4d4d;
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const TIFF_LE: u16 = 0x4949;
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const TIFF_FORTY_TWO: u16 = 0x002a;
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pub const TIFF_BE_SIG: [u8; 4] = [0x4d, 0x4d, 0x00, 0x2a];
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pub const TIFF_LE_SIG: [u8; 4] = [0x49, 0x49, 0x2a, 0x00];
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/// A TIFF field.
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#[derive(Debug)]
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pub struct Field<'a> {
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/// The tag of this field.
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pub tag: Tag,
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/// False for the primary image and true for the thumbnail.
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pub thumbnail: bool,
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/// The value of this field.
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pub value: Value<'a>,
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}
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/// Parse the Exif attributes in the TIFF format.
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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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pub fn parse_exif(data: &[u8]) -> Result<(Vec<Field>, bool), Error> {
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// Check the byte order and call the real parser.
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if data.len() < 8 {
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return Err(Error::InvalidFormat("Truncated TIFF header"));
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}
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match BigEndian::loadu16(data, 0) {
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TIFF_BE => parse_exif_sub::<BigEndian>(data).map(|v| (v, false)),
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TIFF_LE => parse_exif_sub::<LittleEndian>(data).map(|v| (v, true)),
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_ => Err(Error::InvalidFormat("Invalid TIFF byte order")),
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}
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}
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fn parse_exif_sub<E>(data: &[u8])
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-> Result<Vec<Field>, Error> where E: Endian {
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// Parse the rest of the header (42 and the IFD offset).
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if E::loadu16(data, 2) != TIFF_FORTY_TWO {
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return Err(Error::InvalidFormat("Invalid forty two"));
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}
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let ifd_offset = E::loadu32(data, 4) as usize;
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let mut fields = Vec::new();
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parse_ifd::<E>(&mut fields, data, ifd_offset, Context::Tiff, false)?;
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Ok(fields)
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}
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// Parse IFD [EXIF23 4.6.2].
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fn parse_ifd<'a, E>(fields: &mut Vec<Field<'a>>, data: &'a [u8],
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offset: usize, ctx: Context, thumbnail: bool)
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-> Result<(), Error> where E: Endian {
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// Count (the number of the entries).
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if data.len() < offset || data.len() - offset < 2 {
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return Err(Error::InvalidFormat("Truncated IFD count"));
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}
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let count = E::loadu16(data, offset) as usize;
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// Array of entries. (count * 12) never overflows.
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if data.len() - offset - 2 < count * 12 {
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return Err(Error::InvalidFormat("Truncated IFD"));
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}
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for i in 0..count as usize {
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let tag = E::loadu16(data, offset + 2 + i * 12);
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let typ = E::loadu16(data, offset + 2 + i * 12 + 2);
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let cnt = E::loadu32(data, offset + 2 + i * 12 + 4) as usize;
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let valofs_at = offset + 2 + i * 12 + 8;
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let (unitlen, parser) = get_type_info::<E>(typ);
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let vallen = unitlen.checked_mul(cnt).ok_or(
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Error::InvalidFormat("Invalid entry count"))?;
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let val;
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if unitlen == 0 {
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val = Value::Unknown(typ, cnt as u32, valofs_at as u32);
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} else if vallen <= 4 {
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val = parser(data, valofs_at, cnt);
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} else {
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let ofs = E::loadu32(data, valofs_at) as usize;
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if data.len() < ofs || data.len() - ofs < vallen {
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return Err(Error::InvalidFormat("Truncated field value"));
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}
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val = parser(data, ofs, cnt);
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}
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// No infinite recursion will occur because the context is not
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// recursively defined.
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let tag = Tag(ctx, tag);
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match tag {
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Tag::ExifIFDPointer => parse_child_ifd::<E>(
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fields, data, &val, Context::Exif, thumbnail)?,
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Tag::GPSInfoIFDPointer => parse_child_ifd::<E>(
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fields, data, &val, Context::Gps, thumbnail)?,
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Tag::InteropIFDPointer => parse_child_ifd::<E>(
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fields, data, &val, Context::Interop, thumbnail)?,
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_ => fields.push(Field { tag: tag, thumbnail: thumbnail,
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value: val }),
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}
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}
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// Offset to the next IFD.
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if data.len() - offset - 2 - count * 12 < 4 {
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return Err(Error::InvalidFormat("Truncated next IFD offset"));
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}
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let next_ifd_offset = E::loadu32(data, offset + 2 + count * 12) as usize;
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// Ignore IFDs after IFD1 (thumbnail) for now.
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if next_ifd_offset == 0 || thumbnail {
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return Ok(());
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}
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if ctx != Context::Tiff {
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return Err(Error::InvalidFormat("Unexpected next IFD"));
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}
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parse_ifd::<E>(fields, data, next_ifd_offset, Context::Tiff, true)
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}
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fn parse_child_ifd<'a, E>(fields: &mut Vec<Field<'a>>, data: &'a [u8],
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pointer: &Value, ctx: Context, thumbnail: bool)
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-> Result<(), Error> where E: Endian {
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// A pointer field has type == LONG and count == 1, so the
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// value (IFD offset) must be embedded in the "value offset"
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// element of the field.
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let ofs = pointer.get_uint(0).ok_or(
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Error::InvalidFormat("Invalid pointer"))? as usize;
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parse_ifd::<E>(fields, data, ofs, ctx, thumbnail)
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}
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pub fn is_tiff(buf: &[u8]) -> bool {
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buf.starts_with(&TIFF_BE_SIG) || buf.starts_with(&TIFF_LE_SIG)
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}
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/// A struct used to parse a DateTime field.
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///
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/// # Examples
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/// ```
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/// use exif::DateTime;
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/// let dt = DateTime::from_ascii(b"2016:05:04 03:02:01").unwrap();
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/// assert_eq!(dt.year, 2016);
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/// assert_eq!(dt.to_string(), "2016-05-04 03:02:01");
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/// ```
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#[derive(Debug)]
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pub struct DateTime {
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pub year: u16,
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pub month: u8,
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pub day: u8,
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pub hour: u8,
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pub minute: u8,
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pub second: u8,
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/// The subsecond data in nanoseconds. If the Exif attribute has
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/// more sigfinicant digits, they are rounded down.
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pub nanosecond: Option<u32>,
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/// The offset of the time zone in minutes.
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pub offset: Option<i16>,
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}
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impl DateTime {
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/// Parse an ASCII data of a DateTime field. The range of a number
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/// is not validated, so, for example, 13 may be returned as the month.
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///
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/// If the value is blank, `Error::BlankValue` is returned.
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pub fn from_ascii(data: &[u8]) -> Result<DateTime, Error> {
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if data == b" : : : : " || data == b" " {
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return Err(Error::BlankValue("DateTime is blank"));
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} else if data.len() < 19 {
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return Err(Error::InvalidFormat("DateTime too short"));
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} else if !(data[4] == b':' && data[7] == b':' && data[10] == b' ' &&
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data[13] == b':' && data[16] == b':') {
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return Err(Error::InvalidFormat("Invalid DateTime delimiter"));
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}
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Ok(DateTime {
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year: atou16(&data[0..4])?,
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month: atou16(&data[5..7])? as u8,
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day: atou16(&data[8..10])? as u8,
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hour: atou16(&data[11..13])? as u8,
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minute: atou16(&data[14..16])? as u8,
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second: atou16(&data[17..19])? as u8,
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nanosecond: None,
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offset: None,
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})
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}
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/// Parses an SubsecTime-like field.
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pub fn parse_subsec(&mut self, data: &[u8]) -> Result<(), Error> {
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let mut subsec = 0;
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let mut ndigits = 0;
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for &c in data {
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if c == b' ' {
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break;
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}
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subsec = subsec * 10 + ctou32(c)?;
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ndigits += 1;
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if ndigits >= 9 {
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break;
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}
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}
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if ndigits == 0 {
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self.nanosecond = None;
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} else {
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for _ in ndigits..9 {
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subsec *= 10;
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}
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self.nanosecond = Some(subsec);
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}
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Ok(())
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}
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/// Parses an OffsetTime-like field.
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pub fn parse_offset(&mut self, data: &[u8]) -> Result<(), Error> {
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if data == b" : " || data == b" " {
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return Err(Error::BlankValue("OffsetTime is blank"));
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} else if data.len() < 6 {
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return Err(Error::InvalidFormat("OffsetTime too short"));
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} else if data[3] != b':' {
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return Err(Error::InvalidFormat("Invalid OffsetTime delimiter"));
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}
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let hour = atou16(&data[1..3])?;
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let min = atou16(&data[4..6])?;
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let offset = (hour * 60 + min) as i16;
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self.offset = Some(match data[0] {
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b'+' => offset,
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b'-' => -offset,
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_ => return Err(Error::InvalidFormat("Invalid OffsetTime sign")),
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});
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Ok(())
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}
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}
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impl fmt::Display for DateTime {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{:04}-{:02}-{:02} {:02}:{:02}:{:02}",
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self.year, self.month, self.day,
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self.hour, self.minute, self.second)
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}
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}
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impl<'a> Field<'a> {
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/// Returns an object that implements `std::fmt::Display` for
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/// printing the value of this field in a tag-specific format.
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///
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/// To print the value with the unit, call `with_unit` method on the
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/// returned object. It takes a parameter, which is either `()`,
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/// `&Field`, or `&Reader` and provides the unit information.
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/// If the unit does not depend on another field, `()` can be used.
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/// Otherwise, `&Field` or `&Reader` should be used.
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///
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/// # Examples
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///
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/// ```
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/// use exif::{Field, Tag, Value};
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///
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/// let xres = Field {
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/// tag: Tag::XResolution,
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/// thumbnail: false,
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/// value: Value::Rational(vec![(72, 1).into()]),
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/// };
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/// let cm = Field {
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/// tag: Tag::ResolutionUnit,
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/// thumbnail: false,
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/// value: Value::Short(vec![3]),
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/// };
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/// assert_eq!(xres.display_value().to_string(), "72");
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/// assert_eq!(cm.display_value().to_string(), "cm");
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/// // The unit of XResolution is indicated by ResolutionUnit.
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/// assert_eq!(xres.display_value().with_unit(&cm).to_string(),
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/// "72 pixels per cm");
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/// // If ResolutionUnit is not given, the default value is used.
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/// assert_eq!(xres.display_value().with_unit(()).to_string(),
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/// "72 pixels per inch");
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/// assert_eq!(xres.display_value().with_unit(&xres).to_string(),
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/// "72 pixels per inch");
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///
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/// let flen = Field {
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/// tag: Tag::FocalLengthIn35mmFilm,
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/// thumbnail: false,
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/// value: Value::Short(vec![24]),
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/// };
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/// // The unit of the focal length is always mm, so the argument
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/// // has nothing to do with the result.
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/// assert_eq!(flen.display_value().with_unit(()).to_string(), "24 mm");
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/// assert_eq!(flen.display_value().with_unit(&cm).to_string(), "24 mm");
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/// ```
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#[inline]
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pub fn display_value(&self) -> DisplayValue {
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DisplayValue {
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tag: self.tag,
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thumbnail: self.thumbnail,
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value_display: self.value.display_as(self.tag),
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}
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}
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}
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/// Helper struct for printing a value in a tag-specific format.
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pub struct DisplayValue<'a> {
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tag: Tag,
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thumbnail: bool,
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value_display: value::Display<'a>,
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}
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impl<'a> DisplayValue<'a> {
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#[inline]
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pub fn with_unit<'b, T>(&'b self, unit_provider: T)
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-> DisplayValueUnit<T> where T: ProvideUnit<'b> {
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DisplayValueUnit {
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thumbnail: self.thumbnail,
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value_display: self.value_display,
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unit: self.tag.unit(),
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unit_provider: unit_provider,
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}
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}
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}
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impl<'a> fmt::Display for DisplayValue<'a> {
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#[inline]
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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self.value_display.fmt(f)
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}
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}
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/// Helper struct for printing a value with its unit.
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pub struct DisplayValueUnit<'a, T> where T: ProvideUnit<'a> {
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thumbnail: bool,
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value_display: value::Display<'a>,
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unit: Option<&'static [UnitPiece]>,
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unit_provider: T,
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}
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impl<'a, T> fmt::Display for DisplayValueUnit<'a, T> where T: ProvideUnit<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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if let Some(unit) = self.unit {
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assert!(!unit.is_empty());
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for piece in unit {
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match *piece {
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UnitPiece::Value => self.value_display.fmt(f),
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UnitPiece::Str(s) => f.write_str(s),
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UnitPiece::Tag(tag) =>
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if let Some(x) = self.unit_provider.get_field(
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tag, self.thumbnail) {
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x.value.display_as(tag).fmt(f)
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} else if let Some(x) = tag.default_value() {
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x.display_as(tag).fmt(f)
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} else {
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write!(f, "[{} missing]", tag)
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},
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}?
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}
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Ok(())
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} else {
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self.value_display.fmt(f)
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}
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}
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}
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pub trait ProvideUnit<'a>: Copy {
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fn get_field(self, tag: Tag, thumbnail: bool) -> Option<&'a Field<'a>>;
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}
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impl<'a> ProvideUnit<'a> for () {
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fn get_field(self, _tag: Tag, _thumbnail: bool) -> Option<&'a Field<'a>> {
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None
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}
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}
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impl<'a> ProvideUnit<'a> for &'a Field<'a> {
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fn get_field(self, tag: Tag, thumbnail: bool) -> Option<&'a Field<'a>> {
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Some(self).filter(|x| x.tag == tag && x.thumbnail == thumbnail)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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// Before the error is returned, the IFD is parsed twice as the
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// 0th and 1st IFDs.
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#[test]
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fn inf_loop_by_next() {
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let data = b"MM\0\x2a\0\0\0\x08\
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\0\x01\x01\0\0\x03\0\0\0\x01\0\x14\0\0\0\0\0\x08";
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// assert_err_pat!(parse_exif(data),
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// Error::InvalidFormat("Unexpected next IFD"));
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let (v, _) = parse_exif(data).unwrap();
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assert_eq!(v.len(), 2);
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}
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#[test]
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fn unknown_field() {
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let data = b"MM\0\x2a\0\0\0\x08\
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\0\x01\x01\0\xff\xff\0\0\0\x01\0\x14\0\0\0\0\0\0";
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let (v, _) = parse_exif(data).unwrap();
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assert_eq!(v.len(), 1);
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assert_pat!(v[0].value, Value::Unknown(0xffff, 1, 0x12));
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}
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#[test]
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fn date_time() {
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let mut dt = DateTime::from_ascii(b"2016:05:04 03:02:01").unwrap();
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assert_eq!(dt.year, 2016);
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assert_eq!(dt.to_string(), "2016-05-04 03:02:01");
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dt.parse_subsec(b"987").unwrap();
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assert_eq!(dt.nanosecond.unwrap(), 987000000);
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dt.parse_subsec(b"000987").unwrap();
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assert_eq!(dt.nanosecond.unwrap(), 987000);
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dt.parse_subsec(b"987654321").unwrap();
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assert_eq!(dt.nanosecond.unwrap(), 987654321);
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dt.parse_subsec(b"9876543219").unwrap();
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assert_eq!(dt.nanosecond.unwrap(), 987654321);
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dt.parse_subsec(b"130 ").unwrap();
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assert_eq!(dt.nanosecond.unwrap(), 130000000);
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dt.parse_subsec(b"0").unwrap();
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assert_eq!(dt.nanosecond.unwrap(), 0);
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dt.parse_subsec(b"").unwrap();
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assert!(dt.nanosecond.is_none());
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dt.parse_subsec(b" ").unwrap();
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assert!(dt.nanosecond.is_none());
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dt.parse_offset(b"+00:00").unwrap();
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assert_eq!(dt.offset.unwrap(), 0);
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dt.parse_offset(b"+01:23").unwrap();
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assert_eq!(dt.offset.unwrap(), 83);
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dt.parse_offset(b"+99:99").unwrap();
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|
assert_eq!(dt.offset.unwrap(), 6039);
|
|
dt.parse_offset(b"-01:23").unwrap();
|
|
assert_eq!(dt.offset.unwrap(), -83);
|
|
dt.parse_offset(b"-99:99").unwrap();
|
|
assert_eq!(dt.offset.unwrap(), -6039);
|
|
assert_err_pat!(dt.parse_offset(b" : "), Error::BlankValue(_));
|
|
assert_err_pat!(dt.parse_offset(b" "), Error::BlankValue(_));
|
|
}
|
|
|
|
#[test]
|
|
fn display_value_with_unit() {
|
|
let cm = Field {
|
|
tag: Tag::ResolutionUnit,
|
|
thumbnail: false,
|
|
value: Value::Short(vec![3]),
|
|
};
|
|
let cm_tn = Field {
|
|
tag: Tag::ResolutionUnit,
|
|
thumbnail: true,
|
|
value: Value::Short(vec![3]),
|
|
};
|
|
// No unit.
|
|
let exifver = Field {
|
|
tag: Tag::ExifVersion,
|
|
thumbnail: false,
|
|
value: Value::Undefined(b"0231", 0),
|
|
};
|
|
assert_eq!(exifver.display_value().to_string(),
|
|
"2.31");
|
|
assert_eq!(exifver.display_value().with_unit(()).to_string(),
|
|
"2.31");
|
|
assert_eq!(exifver.display_value().with_unit(&cm).to_string(),
|
|
"2.31");
|
|
// Fixed string.
|
|
let width = Field {
|
|
tag: Tag::ImageWidth,
|
|
thumbnail: false,
|
|
value: Value::Short(vec![257]),
|
|
};
|
|
assert_eq!(width.display_value().to_string(),
|
|
"257");
|
|
assert_eq!(width.display_value().with_unit(()).to_string(),
|
|
"257 pixels");
|
|
assert_eq!(width.display_value().with_unit(&cm).to_string(),
|
|
"257 pixels");
|
|
// Unit tag (with a non-default value).
|
|
// Unit tag is missing but the default is specified.
|
|
let xres = Field {
|
|
tag: Tag::XResolution,
|
|
thumbnail: false,
|
|
value: Value::Rational(vec![(300, 1).into()]),
|
|
};
|
|
assert_eq!(xres.display_value().to_string(),
|
|
"300");
|
|
assert_eq!(xres.display_value().with_unit(()).to_string(),
|
|
"300 pixels per inch");
|
|
assert_eq!(xres.display_value().with_unit(&cm).to_string(),
|
|
"300 pixels per cm");
|
|
assert_eq!(xres.display_value().with_unit(&cm_tn).to_string(),
|
|
"300 pixels per inch");
|
|
// Unit tag is missing and the default is not specified.
|
|
let gpslat = Field {
|
|
tag: Tag::GPSLatitude,
|
|
thumbnail: false,
|
|
value: Value::Rational(vec![
|
|
(10, 1).into(), (0, 1).into(), (1, 10).into()]),
|
|
};
|
|
assert_eq!(gpslat.display_value().to_string(),
|
|
"10 deg 0 min 0.1 sec");
|
|
assert_eq!(gpslat.display_value().with_unit(()).to_string(),
|
|
"10 deg 0 min 0.1 sec [GPSLatitudeRef missing]");
|
|
assert_eq!(gpslat.display_value().with_unit(&cm).to_string(),
|
|
"10 deg 0 min 0.1 sec [GPSLatitudeRef missing]");
|
|
}
|
|
}
|