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-rw-r--r--vendor/tiff/src/decoder/mod.rs1176
1 files changed, 0 insertions, 1176 deletions
diff --git a/vendor/tiff/src/decoder/mod.rs b/vendor/tiff/src/decoder/mod.rs
deleted file mode 100644
index 5fa1812..0000000
--- a/vendor/tiff/src/decoder/mod.rs
+++ /dev/null
@@ -1,1176 +0,0 @@
-use std::collections::{HashMap, HashSet};
-use std::convert::TryFrom;
-use std::io::{self, Read, Seek};
-use std::ops::Range;
-
-use crate::{
- bytecast, ColorType, TiffError, TiffFormatError, TiffResult, TiffUnsupportedError, UsageError,
-};
-
-use self::ifd::Directory;
-use self::image::Image;
-use crate::tags::{
- CompressionMethod, PhotometricInterpretation, Predictor, SampleFormat, Tag, Type,
-};
-
-use self::stream::{ByteOrder, EndianReader, SmartReader};
-
-pub mod ifd;
-mod image;
-mod stream;
-mod tag_reader;
-
-/// Result of a decoding process
-#[derive(Debug)]
-pub enum DecodingResult {
- /// A vector of unsigned bytes
- U8(Vec<u8>),
- /// A vector of unsigned words
- U16(Vec<u16>),
- /// A vector of 32 bit unsigned ints
- U32(Vec<u32>),
- /// A vector of 64 bit unsigned ints
- U64(Vec<u64>),
- /// A vector of 32 bit IEEE floats
- F32(Vec<f32>),
- /// A vector of 64 bit IEEE floats
- F64(Vec<f64>),
- /// A vector of 8 bit signed ints
- I8(Vec<i8>),
- /// A vector of 16 bit signed ints
- I16(Vec<i16>),
- /// A vector of 32 bit signed ints
- I32(Vec<i32>),
- /// A vector of 64 bit signed ints
- I64(Vec<i64>),
-}
-
-impl DecodingResult {
- fn new_u8(size: usize, limits: &Limits) -> TiffResult<DecodingResult> {
- if size > limits.decoding_buffer_size {
- Err(TiffError::LimitsExceeded)
- } else {
- Ok(DecodingResult::U8(vec![0; size]))
- }
- }
-
- fn new_u16(size: usize, limits: &Limits) -> TiffResult<DecodingResult> {
- if size > limits.decoding_buffer_size / 2 {
- Err(TiffError::LimitsExceeded)
- } else {
- Ok(DecodingResult::U16(vec![0; size]))
- }
- }
-
- fn new_u32(size: usize, limits: &Limits) -> TiffResult<DecodingResult> {
- if size > limits.decoding_buffer_size / 4 {
- Err(TiffError::LimitsExceeded)
- } else {
- Ok(DecodingResult::U32(vec![0; size]))
- }
- }
-
- fn new_u64(size: usize, limits: &Limits) -> TiffResult<DecodingResult> {
- if size > limits.decoding_buffer_size / 8 {
- Err(TiffError::LimitsExceeded)
- } else {
- Ok(DecodingResult::U64(vec![0; size]))
- }
- }
-
- fn new_f32(size: usize, limits: &Limits) -> TiffResult<DecodingResult> {
- if size > limits.decoding_buffer_size / std::mem::size_of::<f32>() {
- Err(TiffError::LimitsExceeded)
- } else {
- Ok(DecodingResult::F32(vec![0.0; size]))
- }
- }
-
- fn new_f64(size: usize, limits: &Limits) -> TiffResult<DecodingResult> {
- if size > limits.decoding_buffer_size / std::mem::size_of::<f64>() {
- Err(TiffError::LimitsExceeded)
- } else {
- Ok(DecodingResult::F64(vec![0.0; size]))
- }
- }
-
- fn new_i8(size: usize, limits: &Limits) -> TiffResult<DecodingResult> {
- if size > limits.decoding_buffer_size / std::mem::size_of::<i8>() {
- Err(TiffError::LimitsExceeded)
- } else {
- Ok(DecodingResult::I8(vec![0; size]))
- }
- }
-
- fn new_i16(size: usize, limits: &Limits) -> TiffResult<DecodingResult> {
- if size > limits.decoding_buffer_size / 2 {
- Err(TiffError::LimitsExceeded)
- } else {
- Ok(DecodingResult::I16(vec![0; size]))
- }
- }
-
- fn new_i32(size: usize, limits: &Limits) -> TiffResult<DecodingResult> {
- if size > limits.decoding_buffer_size / 4 {
- Err(TiffError::LimitsExceeded)
- } else {
- Ok(DecodingResult::I32(vec![0; size]))
- }
- }
-
- fn new_i64(size: usize, limits: &Limits) -> TiffResult<DecodingResult> {
- if size > limits.decoding_buffer_size / 8 {
- Err(TiffError::LimitsExceeded)
- } else {
- Ok(DecodingResult::I64(vec![0; size]))
- }
- }
-
- pub fn as_buffer(&mut self, start: usize) -> DecodingBuffer {
- match *self {
- DecodingResult::U8(ref mut buf) => DecodingBuffer::U8(&mut buf[start..]),
- DecodingResult::U16(ref mut buf) => DecodingBuffer::U16(&mut buf[start..]),
- DecodingResult::U32(ref mut buf) => DecodingBuffer::U32(&mut buf[start..]),
- DecodingResult::U64(ref mut buf) => DecodingBuffer::U64(&mut buf[start..]),
- DecodingResult::F32(ref mut buf) => DecodingBuffer::F32(&mut buf[start..]),
- DecodingResult::F64(ref mut buf) => DecodingBuffer::F64(&mut buf[start..]),
- DecodingResult::I8(ref mut buf) => DecodingBuffer::I8(&mut buf[start..]),
- DecodingResult::I16(ref mut buf) => DecodingBuffer::I16(&mut buf[start..]),
- DecodingResult::I32(ref mut buf) => DecodingBuffer::I32(&mut buf[start..]),
- DecodingResult::I64(ref mut buf) => DecodingBuffer::I64(&mut buf[start..]),
- }
- }
-}
-
-// A buffer for image decoding
-pub enum DecodingBuffer<'a> {
- /// A slice of unsigned bytes
- U8(&'a mut [u8]),
- /// A slice of unsigned words
- U16(&'a mut [u16]),
- /// A slice of 32 bit unsigned ints
- U32(&'a mut [u32]),
- /// A slice of 64 bit unsigned ints
- U64(&'a mut [u64]),
- /// A slice of 32 bit IEEE floats
- F32(&'a mut [f32]),
- /// A slice of 64 bit IEEE floats
- F64(&'a mut [f64]),
- /// A slice of 8 bits signed ints
- I8(&'a mut [i8]),
- /// A slice of 16 bits signed ints
- I16(&'a mut [i16]),
- /// A slice of 32 bits signed ints
- I32(&'a mut [i32]),
- /// A slice of 64 bits signed ints
- I64(&'a mut [i64]),
-}
-
-impl<'a> DecodingBuffer<'a> {
- fn byte_len(&self) -> usize {
- match *self {
- DecodingBuffer::U8(_) => 1,
- DecodingBuffer::U16(_) => 2,
- DecodingBuffer::U32(_) => 4,
- DecodingBuffer::U64(_) => 8,
- DecodingBuffer::F32(_) => 4,
- DecodingBuffer::F64(_) => 8,
- DecodingBuffer::I8(_) => 1,
- DecodingBuffer::I16(_) => 2,
- DecodingBuffer::I32(_) => 4,
- DecodingBuffer::I64(_) => 8,
- }
- }
-
- fn copy<'b>(&'b mut self) -> DecodingBuffer<'b>
- where
- 'a: 'b,
- {
- match *self {
- DecodingBuffer::U8(ref mut buf) => DecodingBuffer::U8(buf),
- DecodingBuffer::U16(ref mut buf) => DecodingBuffer::U16(buf),
- DecodingBuffer::U32(ref mut buf) => DecodingBuffer::U32(buf),
- DecodingBuffer::U64(ref mut buf) => DecodingBuffer::U64(buf),
- DecodingBuffer::F32(ref mut buf) => DecodingBuffer::F32(buf),
- DecodingBuffer::F64(ref mut buf) => DecodingBuffer::F64(buf),
- DecodingBuffer::I8(ref mut buf) => DecodingBuffer::I8(buf),
- DecodingBuffer::I16(ref mut buf) => DecodingBuffer::I16(buf),
- DecodingBuffer::I32(ref mut buf) => DecodingBuffer::I32(buf),
- DecodingBuffer::I64(ref mut buf) => DecodingBuffer::I64(buf),
- }
- }
-
- fn subrange<'b>(&'b mut self, range: Range<usize>) -> DecodingBuffer<'b>
- where
- 'a: 'b,
- {
- match *self {
- DecodingBuffer::U8(ref mut buf) => DecodingBuffer::U8(&mut buf[range]),
- DecodingBuffer::U16(ref mut buf) => DecodingBuffer::U16(&mut buf[range]),
- DecodingBuffer::U32(ref mut buf) => DecodingBuffer::U32(&mut buf[range]),
- DecodingBuffer::U64(ref mut buf) => DecodingBuffer::U64(&mut buf[range]),
- DecodingBuffer::F32(ref mut buf) => DecodingBuffer::F32(&mut buf[range]),
- DecodingBuffer::F64(ref mut buf) => DecodingBuffer::F64(&mut buf[range]),
- DecodingBuffer::I8(ref mut buf) => DecodingBuffer::I8(&mut buf[range]),
- DecodingBuffer::I16(ref mut buf) => DecodingBuffer::I16(&mut buf[range]),
- DecodingBuffer::I32(ref mut buf) => DecodingBuffer::I32(&mut buf[range]),
- DecodingBuffer::I64(ref mut buf) => DecodingBuffer::I64(&mut buf[range]),
- }
- }
-
- fn as_bytes_mut(&mut self) -> &mut [u8] {
- match self {
- DecodingBuffer::U8(buf) => &mut *buf,
- DecodingBuffer::I8(buf) => bytecast::i8_as_ne_mut_bytes(buf),
- DecodingBuffer::U16(buf) => bytecast::u16_as_ne_mut_bytes(buf),
- DecodingBuffer::I16(buf) => bytecast::i16_as_ne_mut_bytes(buf),
- DecodingBuffer::U32(buf) => bytecast::u32_as_ne_mut_bytes(buf),
- DecodingBuffer::I32(buf) => bytecast::i32_as_ne_mut_bytes(buf),
- DecodingBuffer::U64(buf) => bytecast::u64_as_ne_mut_bytes(buf),
- DecodingBuffer::I64(buf) => bytecast::i64_as_ne_mut_bytes(buf),
- DecodingBuffer::F32(buf) => bytecast::f32_as_ne_mut_bytes(buf),
- DecodingBuffer::F64(buf) => bytecast::f64_as_ne_mut_bytes(buf),
- }
- }
-}
-
-#[derive(Debug, Copy, Clone, PartialEq)]
-/// Chunk type of the internal representation
-pub enum ChunkType {
- Strip,
- Tile,
-}
-
-/// Decoding limits
-#[derive(Clone, Debug)]
-pub struct Limits {
- /// The maximum size of any `DecodingResult` in bytes, the default is
- /// 256MiB. If the entire image is decoded at once, then this will
- /// be the maximum size of the image. If it is decoded one strip at a
- /// time, this will be the maximum size of a strip.
- pub decoding_buffer_size: usize,
- /// The maximum size of any ifd value in bytes, the default is
- /// 1MiB.
- pub ifd_value_size: usize,
- /// Maximum size for intermediate buffer which may be used to limit the amount of data read per
- /// segment even if the entire image is decoded at once.
- pub intermediate_buffer_size: usize,
- /// The purpose of this is to prevent all the fields of the struct from
- /// being public, as this would make adding new fields a major version
- /// bump.
- _non_exhaustive: (),
-}
-
-impl Limits {
- /// A configuration that does not impose any limits.
- ///
- /// This is a good start if the caller only wants to impose selective limits, contrary to the
- /// default limits which allows selectively disabling limits.
- ///
- /// Note that this configuration is likely to crash on excessively large images since,
- /// naturally, the machine running the program does not have infinite memory.
- pub fn unlimited() -> Limits {
- Limits {
- decoding_buffer_size: usize::max_value(),
- ifd_value_size: usize::max_value(),
- intermediate_buffer_size: usize::max_value(),
- _non_exhaustive: (),
- }
- }
-}
-
-impl Default for Limits {
- fn default() -> Limits {
- Limits {
- decoding_buffer_size: 256 * 1024 * 1024,
- intermediate_buffer_size: 128 * 1024 * 1024,
- ifd_value_size: 1024 * 1024,
- _non_exhaustive: (),
- }
- }
-}
-
-/// The representation of a TIFF decoder
-///
-/// Currently does not support decoding of interlaced images
-#[derive(Debug)]
-pub struct Decoder<R>
-where
- R: Read + Seek,
-{
- reader: SmartReader<R>,
- bigtiff: bool,
- limits: Limits,
- next_ifd: Option<u64>,
- ifd_offsets: Vec<u64>,
- seen_ifds: HashSet<u64>,
- image: Image,
-}
-
-trait Wrapping {
- fn wrapping_add(&self, other: Self) -> Self;
-}
-
-impl Wrapping for u8 {
- fn wrapping_add(&self, other: Self) -> Self {
- u8::wrapping_add(*self, other)
- }
-}
-
-impl Wrapping for u16 {
- fn wrapping_add(&self, other: Self) -> Self {
- u16::wrapping_add(*self, other)
- }
-}
-
-impl Wrapping for u32 {
- fn wrapping_add(&self, other: Self) -> Self {
- u32::wrapping_add(*self, other)
- }
-}
-
-impl Wrapping for u64 {
- fn wrapping_add(&self, other: Self) -> Self {
- u64::wrapping_add(*self, other)
- }
-}
-
-impl Wrapping for i8 {
- fn wrapping_add(&self, other: Self) -> Self {
- i8::wrapping_add(*self, other)
- }
-}
-
-impl Wrapping for i16 {
- fn wrapping_add(&self, other: Self) -> Self {
- i16::wrapping_add(*self, other)
- }
-}
-
-impl Wrapping for i32 {
- fn wrapping_add(&self, other: Self) -> Self {
- i32::wrapping_add(*self, other)
- }
-}
-
-impl Wrapping for i64 {
- fn wrapping_add(&self, other: Self) -> Self {
- i64::wrapping_add(*self, other)
- }
-}
-
-fn rev_hpredict_nsamp<T: Copy + Wrapping>(image: &mut [T], samples: usize) {
- for col in samples..image.len() {
- image[col] = image[col].wrapping_add(image[col - samples]);
- }
-}
-
-pub fn fp_predict_f32(input: &mut [u8], output: &mut [f32], samples: usize) {
- rev_hpredict_nsamp(input, samples);
- for i in 0..output.len() {
- // TODO: use f32::from_be_bytes() when we can (version 1.40)
- output[i] = f32::from_bits(u32::from_be_bytes([
- input[input.len() / 4 * 0 + i],
- input[input.len() / 4 * 1 + i],
- input[input.len() / 4 * 2 + i],
- input[input.len() / 4 * 3 + i],
- ]));
- }
-}
-
-pub fn fp_predict_f64(input: &mut [u8], output: &mut [f64], samples: usize) {
- rev_hpredict_nsamp(input, samples);
- for i in 0..output.len() {
- // TODO: use f64::from_be_bytes() when we can (version 1.40)
- output[i] = f64::from_bits(u64::from_be_bytes([
- input[input.len() / 8 * 0 + i],
- input[input.len() / 8 * 1 + i],
- input[input.len() / 8 * 2 + i],
- input[input.len() / 8 * 3 + i],
- input[input.len() / 8 * 4 + i],
- input[input.len() / 8 * 5 + i],
- input[input.len() / 8 * 6 + i],
- input[input.len() / 8 * 7 + i],
- ]));
- }
-}
-
-fn fix_endianness_and_predict(
- mut image: DecodingBuffer,
- samples: usize,
- byte_order: ByteOrder,
- predictor: Predictor,
-) {
- match predictor {
- Predictor::None => {
- fix_endianness(&mut image, byte_order);
- }
- Predictor::Horizontal => {
- fix_endianness(&mut image, byte_order);
- match image {
- DecodingBuffer::U8(buf) => rev_hpredict_nsamp(buf, samples),
- DecodingBuffer::U16(buf) => rev_hpredict_nsamp(buf, samples),
- DecodingBuffer::U32(buf) => rev_hpredict_nsamp(buf, samples),
- DecodingBuffer::U64(buf) => rev_hpredict_nsamp(buf, samples),
- DecodingBuffer::I8(buf) => rev_hpredict_nsamp(buf, samples),
- DecodingBuffer::I16(buf) => rev_hpredict_nsamp(buf, samples),
- DecodingBuffer::I32(buf) => rev_hpredict_nsamp(buf, samples),
- DecodingBuffer::I64(buf) => rev_hpredict_nsamp(buf, samples),
- DecodingBuffer::F32(_) | DecodingBuffer::F64(_) => {
- unreachable!("Caller should have validated arguments. Please file a bug.")
- }
- }
- }
- Predictor::FloatingPoint => {
- let mut buffer_copy = image.as_bytes_mut().to_vec();
- match image {
- DecodingBuffer::F32(buf) => fp_predict_f32(&mut buffer_copy, buf, samples),
- DecodingBuffer::F64(buf) => fp_predict_f64(&mut buffer_copy, buf, samples),
- _ => unreachable!("Caller should have validated arguments. Please file a bug."),
- }
- }
- }
-}
-
-fn invert_colors_unsigned<T>(buffer: &mut [T], max: T)
-where
- T: std::ops::Sub<T> + std::ops::Sub<Output = T> + Copy,
-{
- for datum in buffer.iter_mut() {
- *datum = max - *datum
- }
-}
-
-fn invert_colors_fp<T>(buffer: &mut [T], max: T)
-where
- T: std::ops::Sub<T> + std::ops::Sub<Output = T> + Copy,
-{
- for datum in buffer.iter_mut() {
- // FIXME: assumes [0, 1) range for floats
- *datum = max - *datum
- }
-}
-
-fn invert_colors(buf: &mut DecodingBuffer, color_type: ColorType) {
- match (color_type, buf) {
- (ColorType::Gray(64), DecodingBuffer::U64(ref mut buffer)) => {
- invert_colors_unsigned(buffer, 0xffff_ffff_ffff_ffff);
- }
- (ColorType::Gray(32), DecodingBuffer::U32(ref mut buffer)) => {
- invert_colors_unsigned(buffer, 0xffff_ffff);
- }
- (ColorType::Gray(16), DecodingBuffer::U16(ref mut buffer)) => {
- invert_colors_unsigned(buffer, 0xffff);
- }
- (ColorType::Gray(n), DecodingBuffer::U8(ref mut buffer)) if n <= 8 => {
- invert_colors_unsigned(buffer, 0xff);
- }
- (ColorType::Gray(32), DecodingBuffer::F32(ref mut buffer)) => {
- invert_colors_fp(buffer, 1.0);
- }
- (ColorType::Gray(64), DecodingBuffer::F64(ref mut buffer)) => {
- invert_colors_fp(buffer, 1.0);
- }
- _ => {}
- }
-}
-
-/// Fix endianness. If `byte_order` matches the host, then conversion is a no-op.
-fn fix_endianness(buf: &mut DecodingBuffer, byte_order: ByteOrder) {
- match byte_order {
- ByteOrder::LittleEndian => match buf {
- DecodingBuffer::U8(_) | DecodingBuffer::I8(_) => {}
- DecodingBuffer::U16(b) => b.iter_mut().for_each(|v| *v = u16::from_le(*v)),
- DecodingBuffer::I16(b) => b.iter_mut().for_each(|v| *v = i16::from_le(*v)),
- DecodingBuffer::U32(b) => b.iter_mut().for_each(|v| *v = u32::from_le(*v)),
- DecodingBuffer::I32(b) => b.iter_mut().for_each(|v| *v = i32::from_le(*v)),
- DecodingBuffer::U64(b) => b.iter_mut().for_each(|v| *v = u64::from_le(*v)),
- DecodingBuffer::I64(b) => b.iter_mut().for_each(|v| *v = i64::from_le(*v)),
- DecodingBuffer::F32(b) => b
- .iter_mut()
- .for_each(|v| *v = f32::from_bits(u32::from_le(v.to_bits()))),
- DecodingBuffer::F64(b) => b
- .iter_mut()
- .for_each(|v| *v = f64::from_bits(u64::from_le(v.to_bits()))),
- },
- ByteOrder::BigEndian => match buf {
- DecodingBuffer::U8(_) | DecodingBuffer::I8(_) => {}
- DecodingBuffer::U16(b) => b.iter_mut().for_each(|v| *v = u16::from_be(*v)),
- DecodingBuffer::I16(b) => b.iter_mut().for_each(|v| *v = i16::from_be(*v)),
- DecodingBuffer::U32(b) => b.iter_mut().for_each(|v| *v = u32::from_be(*v)),
- DecodingBuffer::I32(b) => b.iter_mut().for_each(|v| *v = i32::from_be(*v)),
- DecodingBuffer::U64(b) => b.iter_mut().for_each(|v| *v = u64::from_be(*v)),
- DecodingBuffer::I64(b) => b.iter_mut().for_each(|v| *v = i64::from_be(*v)),
- DecodingBuffer::F32(b) => b
- .iter_mut()
- .for_each(|v| *v = f32::from_bits(u32::from_be(v.to_bits()))),
- DecodingBuffer::F64(b) => b
- .iter_mut()
- .for_each(|v| *v = f64::from_bits(u64::from_be(v.to_bits()))),
- },
- };
-}
-
-impl<R: Read + Seek> Decoder<R> {
- /// Create a new decoder that decodes from the stream ```r```
- pub fn new(mut r: R) -> TiffResult<Decoder<R>> {
- let mut endianess = Vec::with_capacity(2);
- (&mut r).take(2).read_to_end(&mut endianess)?;
- let byte_order = match &*endianess {
- b"II" => ByteOrder::LittleEndian,
- b"MM" => ByteOrder::BigEndian,
- _ => {
- return Err(TiffError::FormatError(
- TiffFormatError::TiffSignatureNotFound,
- ))
- }
- };
- let mut reader = SmartReader::wrap(r, byte_order);
-
- let bigtiff = match reader.read_u16()? {
- 42 => false,
- 43 => {
- // Read bytesize of offsets (in bigtiff it's alway 8 but provide a way to move to 16 some day)
- if reader.read_u16()? != 8 {
- return Err(TiffError::FormatError(
- TiffFormatError::TiffSignatureNotFound,
- ));
- }
- // This constant should always be 0
- if reader.read_u16()? != 0 {
- return Err(TiffError::FormatError(
- TiffFormatError::TiffSignatureNotFound,
- ));
- }
- true
- }
- _ => {
- return Err(TiffError::FormatError(
- TiffFormatError::TiffSignatureInvalid,
- ))
- }
- };
- let next_ifd = if bigtiff {
- Some(reader.read_u64()?)
- } else {
- Some(u64::from(reader.read_u32()?))
- };
-
- let mut seen_ifds = HashSet::new();
- seen_ifds.insert(*next_ifd.as_ref().unwrap());
- let ifd_offsets = vec![*next_ifd.as_ref().unwrap()];
-
- let mut decoder = Decoder {
- reader,
- bigtiff,
- limits: Default::default(),
- next_ifd,
- ifd_offsets,
- seen_ifds,
- image: Image {
- ifd: None,
- width: 0,
- height: 0,
- bits_per_sample: vec![1],
- samples: 1,
- sample_format: vec![SampleFormat::Uint],
- photometric_interpretation: PhotometricInterpretation::BlackIsZero,
- compression_method: CompressionMethod::None,
- jpeg_tables: None,
- predictor: Predictor::None,
- chunk_type: ChunkType::Strip,
- strip_decoder: None,
- tile_attributes: None,
- chunk_offsets: Vec::new(),
- chunk_bytes: Vec::new(),
- },
- };
- decoder.next_image()?;
- Ok(decoder)
- }
-
- pub fn with_limits(mut self, limits: Limits) -> Decoder<R> {
- self.limits = limits;
- self
- }
-
- pub fn dimensions(&mut self) -> TiffResult<(u32, u32)> {
- Ok((self.image().width, self.image().height))
- }
-
- pub fn colortype(&mut self) -> TiffResult<ColorType> {
- self.image().colortype()
- }
-
- fn image(&self) -> &Image {
- &self.image
- }
-
- /// Loads the IFD at the specified index in the list, if one exists
- pub fn seek_to_image(&mut self, ifd_index: usize) -> TiffResult<()> {
- // Check whether we have seen this IFD before, if so then the index will be less than the length of the list of ifd offsets
- if ifd_index >= self.ifd_offsets.len() {
- // We possibly need to load in the next IFD
- if self.next_ifd.is_none() {
- return Err(TiffError::FormatError(
- TiffFormatError::ImageFileDirectoryNotFound,
- ));
- }
-
- loop {
- // Follow the list until we find the one we want, or we reach the end, whichever happens first
- let (_ifd, next_ifd) = self.next_ifd()?;
-
- if next_ifd.is_none() {
- break;
- }
-
- if ifd_index < self.ifd_offsets.len() {
- break;
- }
- }
- }
-
- // If the index is within the list of ifds then we can load the selected image/IFD
- if let Some(ifd_offset) = self.ifd_offsets.get(ifd_index) {
- let (ifd, _next_ifd) = Self::read_ifd(&mut self.reader, self.bigtiff, *ifd_offset)?;
-
- self.image = Image::from_reader(&mut self.reader, ifd, &self.limits, self.bigtiff)?;
-
- Ok(())
- } else {
- Err(TiffError::FormatError(
- TiffFormatError::ImageFileDirectoryNotFound,
- ))
- }
- }
-
- fn next_ifd(&mut self) -> TiffResult<(Directory, Option<u64>)> {
- if self.next_ifd.is_none() {
- return Err(TiffError::FormatError(
- TiffFormatError::ImageFileDirectoryNotFound,
- ));
- }
-
- let (ifd, next_ifd) = Self::read_ifd(
- &mut self.reader,
- self.bigtiff,
- self.next_ifd.take().unwrap(),
- )?;
-
- if let Some(next) = next_ifd {
- if !self.seen_ifds.insert(next) {
- return Err(TiffError::FormatError(TiffFormatError::CycleInOffsets));
- }
- self.next_ifd = Some(next);
- self.ifd_offsets.push(next);
- }
-
- Ok((ifd, next_ifd))
- }
-
- /// Reads in the next image.
- /// If there is no further image in the TIFF file a format error is returned.
- /// To determine whether there are more images call `TIFFDecoder::more_images` instead.
- pub fn next_image(&mut self) -> TiffResult<()> {
- let (ifd, _next_ifd) = self.next_ifd()?;
-
- self.image = Image::from_reader(&mut self.reader, ifd, &self.limits, self.bigtiff)?;
- Ok(())
- }
-
- /// Returns `true` if there is at least one more image available.
- pub fn more_images(&self) -> bool {
- self.next_ifd.is_some()
- }
-
- /// Returns the byte_order
- pub fn byte_order(&self) -> ByteOrder {
- self.reader.byte_order
- }
-
- #[inline]
- pub fn read_ifd_offset(&mut self) -> Result<u64, io::Error> {
- if self.bigtiff {
- self.read_long8()
- } else {
- self.read_long().map(u64::from)
- }
- }
-
- /// Reads a TIFF byte value
- #[inline]
- pub fn read_byte(&mut self) -> Result<u8, io::Error> {
- let mut buf = [0; 1];
- self.reader.read_exact(&mut buf)?;
- Ok(buf[0])
- }
-
- /// Reads a TIFF short value
- #[inline]
- pub fn read_short(&mut self) -> Result<u16, io::Error> {
- self.reader.read_u16()
- }
-
- /// Reads a TIFF sshort value
- #[inline]
- pub fn read_sshort(&mut self) -> Result<i16, io::Error> {
- self.reader.read_i16()
- }
-
- /// Reads a TIFF long value
- #[inline]
- pub fn read_long(&mut self) -> Result<u32, io::Error> {
- self.reader.read_u32()
- }
-
- /// Reads a TIFF slong value
- #[inline]
- pub fn read_slong(&mut self) -> Result<i32, io::Error> {
- self.reader.read_i32()
- }
-
- /// Reads a TIFF float value
- #[inline]
- pub fn read_float(&mut self) -> Result<f32, io::Error> {
- self.reader.read_f32()
- }
-
- /// Reads a TIFF double value
- #[inline]
- pub fn read_double(&mut self) -> Result<f64, io::Error> {
- self.reader.read_f64()
- }
-
- #[inline]
- pub fn read_long8(&mut self) -> Result<u64, io::Error> {
- self.reader.read_u64()
- }
-
- #[inline]
- pub fn read_slong8(&mut self) -> Result<i64, io::Error> {
- self.reader.read_i64()
- }
-
- /// Reads a string
- #[inline]
- pub fn read_string(&mut self, length: usize) -> TiffResult<String> {
- let mut out = vec![0; length];
- self.reader.read_exact(&mut out)?;
- // Strings may be null-terminated, so we trim anything downstream of the null byte
- if let Some(first) = out.iter().position(|&b| b == 0) {
- out.truncate(first);
- }
- Ok(String::from_utf8(out)?)
- }
-
- /// Reads a TIFF IFA offset/value field
- #[inline]
- pub fn read_offset(&mut self) -> TiffResult<[u8; 4]> {
- if self.bigtiff {
- return Err(TiffError::FormatError(
- TiffFormatError::InconsistentSizesEncountered,
- ));
- }
- let mut val = [0; 4];
- self.reader.read_exact(&mut val)?;
- Ok(val)
- }
-
- /// Reads a TIFF IFA offset/value field
- #[inline]
- pub fn read_offset_u64(&mut self) -> Result<[u8; 8], io::Error> {
- let mut val = [0; 8];
- self.reader.read_exact(&mut val)?;
- Ok(val)
- }
-
- /// Moves the cursor to the specified offset
- #[inline]
- pub fn goto_offset(&mut self, offset: u32) -> io::Result<()> {
- self.goto_offset_u64(offset.into())
- }
-
- #[inline]
- pub fn goto_offset_u64(&mut self, offset: u64) -> io::Result<()> {
- self.reader.seek(io::SeekFrom::Start(offset)).map(|_| ())
- }
-
- /// Reads a IFD entry.
- // An IFD entry has four fields:
- //
- // Tag 2 bytes
- // Type 2 bytes
- // Count 4 bytes
- // Value 4 bytes either a pointer the value itself
- fn read_entry(
- reader: &mut SmartReader<R>,
- bigtiff: bool,
- ) -> TiffResult<Option<(Tag, ifd::Entry)>> {
- let tag = Tag::from_u16_exhaustive(reader.read_u16()?);
- let type_ = match Type::from_u16(reader.read_u16()?) {
- Some(t) => t,
- None => {
- // Unknown type. Skip this entry according to spec.
- reader.read_u32()?;
- reader.read_u32()?;
- return Ok(None);
- }
- };
- let entry = if bigtiff {
- let mut offset = [0; 8];
-
- let count = reader.read_u64()?;
- reader.read_exact(&mut offset)?;
- ifd::Entry::new_u64(type_, count, offset)
- } else {
- let mut offset = [0; 4];
-
- let count = reader.read_u32()?;
- reader.read_exact(&mut offset)?;
- ifd::Entry::new(type_, count, offset)
- };
- Ok(Some((tag, entry)))
- }
-
- /// Reads the IFD starting at the indicated location.
- fn read_ifd(
- reader: &mut SmartReader<R>,
- bigtiff: bool,
- ifd_location: u64,
- ) -> TiffResult<(Directory, Option<u64>)> {
- reader.goto_offset(ifd_location)?;
-
- let mut dir: Directory = HashMap::new();
-
- let num_tags = if bigtiff {
- reader.read_u64()?
- } else {
- reader.read_u16()?.into()
- };
- for _ in 0..num_tags {
- let (tag, entry) = match Self::read_entry(reader, bigtiff)? {
- Some(val) => val,
- None => {
- continue;
- } // Unknown data type in tag, skip
- };
- dir.insert(tag, entry);
- }
-
- let next_ifd = if bigtiff {
- reader.read_u64()?
- } else {
- reader.read_u32()?.into()
- };
-
- let next_ifd = match next_ifd {
- 0 => None,
- _ => Some(next_ifd),
- };
-
- Ok((dir, next_ifd))
- }
-
- /// Tries to retrieve a tag.
- /// Return `Ok(None)` if the tag is not present.
- pub fn find_tag(&mut self, tag: Tag) -> TiffResult<Option<ifd::Value>> {
- let entry = match self.image().ifd.as_ref().unwrap().get(&tag) {
- None => return Ok(None),
- Some(entry) => entry.clone(),
- };
-
- Ok(Some(entry.val(
- &self.limits,
- self.bigtiff,
- &mut self.reader,
- )?))
- }
-
- /// Tries to retrieve a tag and convert it to the desired unsigned type.
- pub fn find_tag_unsigned<T: TryFrom<u64>>(&mut self, tag: Tag) -> TiffResult<Option<T>> {
- self.find_tag(tag)?
- .map(|v| v.into_u64())
- .transpose()?
- .map(|value| {
- T::try_from(value).map_err(|_| TiffFormatError::InvalidTagValueType(tag).into())
- })
- .transpose()
- }
-
- /// Tries to retrieve a vector of all a tag's values and convert them to
- /// the desired unsigned type.
- pub fn find_tag_unsigned_vec<T: TryFrom<u64>>(
- &mut self,
- tag: Tag,
- ) -> TiffResult<Option<Vec<T>>> {
- self.find_tag(tag)?
- .map(|v| v.into_u64_vec())
- .transpose()?
- .map(|v| {
- v.into_iter()
- .map(|u| {
- T::try_from(u).map_err(|_| TiffFormatError::InvalidTagValueType(tag).into())
- })
- .collect()
- })
- .transpose()
- }
-
- /// Tries to retrieve a tag and convert it to the desired unsigned type.
- /// Returns an error if the tag is not present.
- pub fn get_tag_unsigned<T: TryFrom<u64>>(&mut self, tag: Tag) -> TiffResult<T> {
- self.find_tag_unsigned(tag)?
- .ok_or_else(|| TiffFormatError::RequiredTagNotFound(tag).into())
- }
-
- /// Tries to retrieve a tag.
- /// Returns an error if the tag is not present
- pub fn get_tag(&mut self, tag: Tag) -> TiffResult<ifd::Value> {
- match self.find_tag(tag)? {
- Some(val) => Ok(val),
- None => Err(TiffError::FormatError(
- TiffFormatError::RequiredTagNotFound(tag),
- )),
- }
- }
-
- /// Tries to retrieve a tag and convert it to the desired type.
- pub fn get_tag_u32(&mut self, tag: Tag) -> TiffResult<u32> {
- self.get_tag(tag)?.into_u32()
- }
- pub fn get_tag_u64(&mut self, tag: Tag) -> TiffResult<u64> {
- self.get_tag(tag)?.into_u64()
- }
-
- /// Tries to retrieve a tag and convert it to the desired type.
- pub fn get_tag_f32(&mut self, tag: Tag) -> TiffResult<f32> {
- self.get_tag(tag)?.into_f32()
- }
-
- /// Tries to retrieve a tag and convert it to the desired type.
- pub fn get_tag_f64(&mut self, tag: Tag) -> TiffResult<f64> {
- self.get_tag(tag)?.into_f64()
- }
-
- /// Tries to retrieve a tag and convert it to the desired type.
- pub fn get_tag_u32_vec(&mut self, tag: Tag) -> TiffResult<Vec<u32>> {
- self.get_tag(tag)?.into_u32_vec()
- }
-
- pub fn get_tag_u16_vec(&mut self, tag: Tag) -> TiffResult<Vec<u16>> {
- self.get_tag(tag)?.into_u16_vec()
- }
- pub fn get_tag_u64_vec(&mut self, tag: Tag) -> TiffResult<Vec<u64>> {
- self.get_tag(tag)?.into_u64_vec()
- }
-
- /// Tries to retrieve a tag and convert it to the desired type.
- pub fn get_tag_f32_vec(&mut self, tag: Tag) -> TiffResult<Vec<f32>> {
- self.get_tag(tag)?.into_f32_vec()
- }
-
- /// Tries to retrieve a tag and convert it to the desired type.
- pub fn get_tag_f64_vec(&mut self, tag: Tag) -> TiffResult<Vec<f64>> {
- self.get_tag(tag)?.into_f64_vec()
- }
-
- /// Tries to retrieve a tag and convert it to a 8bit vector.
- pub fn get_tag_u8_vec(&mut self, tag: Tag) -> TiffResult<Vec<u8>> {
- self.get_tag(tag)?.into_u8_vec()
- }
-
- /// Tries to retrieve a tag and convert it to a ascii vector.
- pub fn get_tag_ascii_string(&mut self, tag: Tag) -> TiffResult<String> {
- self.get_tag(tag)?.into_string()
- }
-
- fn check_chunk_type(&self, expected: ChunkType) -> TiffResult<()> {
- if expected != self.image().chunk_type {
- return Err(TiffError::UsageError(UsageError::InvalidChunkType(
- expected,
- self.image().chunk_type,
- )));
- }
-
- Ok(())
- }
-
- /// The chunk type (Strips / Tiles) of the image
- pub fn get_chunk_type(&self) -> ChunkType {
- self.image().chunk_type
- }
-
- /// Number of strips in image
- pub fn strip_count(&mut self) -> TiffResult<u32> {
- self.check_chunk_type(ChunkType::Strip)?;
- let rows_per_strip = self.image().strip_decoder.as_ref().unwrap().rows_per_strip;
-
- if rows_per_strip == 0 {
- return Ok(0);
- }
-
- // rows_per_strip - 1 can never fail since we know it's at least 1
- let height = match self.image().height.checked_add(rows_per_strip - 1) {
- Some(h) => h,
- None => return Err(TiffError::IntSizeError),
- };
-
- Ok(height / rows_per_strip)
- }
-
- /// Number of tiles in image
- pub fn tile_count(&mut self) -> TiffResult<u32> {
- self.check_chunk_type(ChunkType::Tile)?;
- Ok(u32::try_from(self.image().chunk_offsets.len())?)
- }
-
- pub fn read_chunk_to_buffer(
- &mut self,
- mut buffer: DecodingBuffer,
- chunk_index: u32,
- output_width: usize,
- ) -> TiffResult<()> {
- let offset = self.image.chunk_file_range(chunk_index)?.0;
- self.goto_offset_u64(offset)?;
-
- let byte_order = self.reader.byte_order;
-
- self.image.expand_chunk(
- &mut self.reader,
- buffer.copy(),
- output_width,
- byte_order,
- chunk_index,
- )?;
-
- Ok(())
- }
-
- fn result_buffer(&self, width: usize, height: usize) -> TiffResult<DecodingResult> {
- let buffer_size = match width
- .checked_mul(height)
- .and_then(|x| x.checked_mul(self.image().bits_per_sample.len()))
- {
- Some(s) => s,
- None => return Err(TiffError::LimitsExceeded),
- };
-
- let max_sample_bits = self
- .image()
- .bits_per_sample
- .iter()
- .cloned()
- .max()
- .unwrap_or(8);
- match self
- .image()
- .sample_format
- .first()
- .unwrap_or(&SampleFormat::Uint)
- {
- SampleFormat::Uint => match max_sample_bits {
- n if n <= 8 => DecodingResult::new_u8(buffer_size, &self.limits),
- n if n <= 16 => DecodingResult::new_u16(buffer_size, &self.limits),
- n if n <= 32 => DecodingResult::new_u32(buffer_size, &self.limits),
- n if n <= 64 => DecodingResult::new_u64(buffer_size, &self.limits),
- n => Err(TiffError::UnsupportedError(
- TiffUnsupportedError::UnsupportedBitsPerChannel(n),
- )),
- },
- SampleFormat::IEEEFP => match max_sample_bits {
- 32 => DecodingResult::new_f32(buffer_size, &self.limits),
- 64 => DecodingResult::new_f64(buffer_size, &self.limits),
- n => Err(TiffError::UnsupportedError(
- TiffUnsupportedError::UnsupportedBitsPerChannel(n),
- )),
- },
- SampleFormat::Int => match max_sample_bits {
- n if n <= 8 => DecodingResult::new_i8(buffer_size, &self.limits),
- n if n <= 16 => DecodingResult::new_i16(buffer_size, &self.limits),
- n if n <= 32 => DecodingResult::new_i32(buffer_size, &self.limits),
- n if n <= 64 => DecodingResult::new_i64(buffer_size, &self.limits),
- n => Err(TiffError::UnsupportedError(
- TiffUnsupportedError::UnsupportedBitsPerChannel(n),
- )),
- },
- format => {
- Err(TiffUnsupportedError::UnsupportedSampleFormat(vec![format.clone()]).into())
- }
- }
- }
-
- /// Read the specified chunk (at index `chunk_index`) and return the binary data as a Vector.
- pub fn read_chunk(&mut self, chunk_index: u32) -> TiffResult<DecodingResult> {
- let data_dims = self.image().chunk_data_dimensions(chunk_index)?;
-
- let mut result = self.result_buffer(data_dims.0 as usize, data_dims.1 as usize)?;
-
- self.read_chunk_to_buffer(result.as_buffer(0), chunk_index, data_dims.0 as usize)?;
-
- Ok(result)
- }
-
- /// Returns the default chunk size for the current image. Any given chunk in the image is at most as large as
- /// the value returned here. For the size of the data (chunk minus padding), use `chunk_data_dimensions`.
- pub fn chunk_dimensions(&self) -> (u32, u32) {
- self.image().chunk_dimensions().unwrap()
- }
-
- /// Returns the size of the data in the chunk with the specified index. This is the default size of the chunk,
- /// minus any padding.
- pub fn chunk_data_dimensions(&self, chunk_index: u32) -> (u32, u32) {
- self.image()
- .chunk_data_dimensions(chunk_index)
- .expect("invalid chunk_index")
- }
-
- /// Decodes the entire image and return it as a Vector
- pub fn read_image(&mut self) -> TiffResult<DecodingResult> {
- let width = self.image().width;
- let height = self.image().height;
- let mut result = self.result_buffer(width as usize, height as usize)?;
- if width == 0 || height == 0 {
- return Ok(result);
- }
-
- let chunk_dimensions = self.image().chunk_dimensions()?;
- let chunk_dimensions = (
- chunk_dimensions.0.min(width),
- chunk_dimensions.1.min(height),
- );
- if chunk_dimensions.0 == 0 || chunk_dimensions.1 == 0 {
- return Err(TiffError::FormatError(
- TiffFormatError::InconsistentSizesEncountered,
- ));
- }
-
- let samples = self.image().bits_per_sample.len();
- if samples == 0 {
- return Err(TiffError::FormatError(
- TiffFormatError::InconsistentSizesEncountered,
- ));
- }
-
- let chunks_across = ((width - 1) / chunk_dimensions.0 + 1) as usize;
- let strip_samples = width as usize * chunk_dimensions.1 as usize * samples;
-
- for chunk in 0..self.image().chunk_offsets.len() {
- self.goto_offset_u64(self.image().chunk_offsets[chunk])?;
-
- let x = chunk % chunks_across;
- let y = chunk / chunks_across;
- let buffer_offset = y * strip_samples + x * chunk_dimensions.0 as usize * samples;
- let byte_order = self.reader.byte_order;
- self.image.expand_chunk(
- &mut self.reader,
- result.as_buffer(buffer_offset).copy(),
- width as usize,
- byte_order,
- chunk as u32,
- )?;
- }
-
- Ok(result)
- }
-}
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