aboutsummaryrefslogtreecommitdiff
path: root/vendor/tiff/src/decoder/ifd.rs
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/tiff/src/decoder/ifd.rs')
-rw-r--r--vendor/tiff/src/decoder/ifd.rs670
1 files changed, 670 insertions, 0 deletions
diff --git a/vendor/tiff/src/decoder/ifd.rs b/vendor/tiff/src/decoder/ifd.rs
new file mode 100644
index 0000000..b05513d
--- /dev/null
+++ b/vendor/tiff/src/decoder/ifd.rs
@@ -0,0 +1,670 @@
+//! Function for reading TIFF tags
+
+use std::collections::HashMap;
+use std::convert::{TryFrom, TryInto};
+use std::io::{self, Read, Seek};
+use std::mem;
+use std::str;
+
+use super::stream::{ByteOrder, EndianReader, SmartReader};
+use crate::tags::{Tag, Type};
+use crate::{TiffError, TiffFormatError, TiffResult};
+
+use self::Value::{
+ Ascii, Byte, Double, Float, Ifd, IfdBig, List, Rational, RationalBig, SRational, SRationalBig,
+ Short, Signed, SignedBig, Unsigned, UnsignedBig,
+};
+
+#[allow(unused_qualifications)]
+#[derive(Debug, Clone, PartialEq)]
+#[non_exhaustive]
+pub enum Value {
+ Byte(u8),
+ Short(u16),
+ Signed(i32),
+ SignedBig(i64),
+ Unsigned(u32),
+ UnsignedBig(u64),
+ Float(f32),
+ Double(f64),
+ List(Vec<Value>),
+ Rational(u32, u32),
+ RationalBig(u64, u64),
+ SRational(i32, i32),
+ SRationalBig(i64, i64),
+ Ascii(String),
+ Ifd(u32),
+ IfdBig(u64),
+}
+
+impl Value {
+ pub fn into_u8(self) -> TiffResult<u8> {
+ match self {
+ Byte(val) => Ok(val),
+ val => Err(TiffError::FormatError(TiffFormatError::ByteExpected(val))),
+ }
+ }
+
+ pub fn into_u16(self) -> TiffResult<u16> {
+ match self {
+ Short(val) => Ok(val),
+ Unsigned(val) => Ok(u16::try_from(val)?),
+ UnsignedBig(val) => Ok(u16::try_from(val)?),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::UnsignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_u32(self) -> TiffResult<u32> {
+ match self {
+ Short(val) => Ok(val.into()),
+ Unsigned(val) => Ok(val),
+ UnsignedBig(val) => Ok(u32::try_from(val)?),
+ Ifd(val) => Ok(val),
+ IfdBig(val) => Ok(u32::try_from(val)?),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::UnsignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_i32(self) -> TiffResult<i32> {
+ match self {
+ Signed(val) => Ok(val),
+ SignedBig(val) => Ok(i32::try_from(val)?),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::SignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_u64(self) -> TiffResult<u64> {
+ match self {
+ Short(val) => Ok(val.into()),
+ Unsigned(val) => Ok(val.into()),
+ UnsignedBig(val) => Ok(val),
+ Ifd(val) => Ok(val.into()),
+ IfdBig(val) => Ok(val),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::UnsignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_i64(self) -> TiffResult<i64> {
+ match self {
+ Signed(val) => Ok(val.into()),
+ SignedBig(val) => Ok(val),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::SignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_f32(self) -> TiffResult<f32> {
+ match self {
+ Float(val) => Ok(val),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::SignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_f64(self) -> TiffResult<f64> {
+ match self {
+ Double(val) => Ok(val),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::SignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_string(self) -> TiffResult<String> {
+ match self {
+ Ascii(val) => Ok(val),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::SignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_u32_vec(self) -> TiffResult<Vec<u32>> {
+ match self {
+ List(vec) => {
+ let mut new_vec = Vec::with_capacity(vec.len());
+ for v in vec {
+ new_vec.push(v.into_u32()?)
+ }
+ Ok(new_vec)
+ }
+ Unsigned(val) => Ok(vec![val]),
+ UnsignedBig(val) => Ok(vec![u32::try_from(val)?]),
+ Rational(numerator, denominator) => Ok(vec![numerator, denominator]),
+ RationalBig(numerator, denominator) => {
+ Ok(vec![u32::try_from(numerator)?, u32::try_from(denominator)?])
+ }
+ Ifd(val) => Ok(vec![val]),
+ IfdBig(val) => Ok(vec![u32::try_from(val)?]),
+ Ascii(val) => Ok(val.chars().map(u32::from).collect()),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::UnsignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_u8_vec(self) -> TiffResult<Vec<u8>> {
+ match self {
+ List(vec) => {
+ let mut new_vec = Vec::with_capacity(vec.len());
+ for v in vec {
+ new_vec.push(v.into_u8()?)
+ }
+ Ok(new_vec)
+ }
+ Byte(val) => Ok(vec![val]),
+
+ val => Err(TiffError::FormatError(
+ TiffFormatError::UnsignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_u16_vec(self) -> TiffResult<Vec<u16>> {
+ match self {
+ List(vec) => {
+ let mut new_vec = Vec::with_capacity(vec.len());
+ for v in vec {
+ new_vec.push(v.into_u16()?)
+ }
+ Ok(new_vec)
+ }
+ Short(val) => Ok(vec![val]),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::UnsignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_i32_vec(self) -> TiffResult<Vec<i32>> {
+ match self {
+ List(vec) => {
+ let mut new_vec = Vec::with_capacity(vec.len());
+ for v in vec {
+ match v {
+ SRational(numerator, denominator) => {
+ new_vec.push(numerator);
+ new_vec.push(denominator);
+ }
+ SRationalBig(numerator, denominator) => {
+ new_vec.push(i32::try_from(numerator)?);
+ new_vec.push(i32::try_from(denominator)?);
+ }
+ _ => new_vec.push(v.into_i32()?),
+ }
+ }
+ Ok(new_vec)
+ }
+ Signed(val) => Ok(vec![val]),
+ SignedBig(val) => Ok(vec![i32::try_from(val)?]),
+ SRational(numerator, denominator) => Ok(vec![numerator, denominator]),
+ SRationalBig(numerator, denominator) => {
+ Ok(vec![i32::try_from(numerator)?, i32::try_from(denominator)?])
+ }
+ val => Err(TiffError::FormatError(
+ TiffFormatError::SignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_f32_vec(self) -> TiffResult<Vec<f32>> {
+ match self {
+ List(vec) => {
+ let mut new_vec = Vec::with_capacity(vec.len());
+ for v in vec {
+ new_vec.push(v.into_f32()?)
+ }
+ Ok(new_vec)
+ }
+ Float(val) => Ok(vec![val]),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::UnsignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_f64_vec(self) -> TiffResult<Vec<f64>> {
+ match self {
+ List(vec) => {
+ let mut new_vec = Vec::with_capacity(vec.len());
+ for v in vec {
+ new_vec.push(v.into_f64()?)
+ }
+ Ok(new_vec)
+ }
+ Double(val) => Ok(vec![val]),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::UnsignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_u64_vec(self) -> TiffResult<Vec<u64>> {
+ match self {
+ List(vec) => {
+ let mut new_vec = Vec::with_capacity(vec.len());
+ for v in vec {
+ new_vec.push(v.into_u64()?)
+ }
+ Ok(new_vec)
+ }
+ Unsigned(val) => Ok(vec![val.into()]),
+ UnsignedBig(val) => Ok(vec![val]),
+ Rational(numerator, denominator) => Ok(vec![numerator.into(), denominator.into()]),
+ RationalBig(numerator, denominator) => Ok(vec![numerator, denominator]),
+ Ifd(val) => Ok(vec![val.into()]),
+ IfdBig(val) => Ok(vec![val]),
+ Ascii(val) => Ok(val.chars().map(u32::from).map(u64::from).collect()),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::UnsignedIntegerExpected(val),
+ )),
+ }
+ }
+
+ pub fn into_i64_vec(self) -> TiffResult<Vec<i64>> {
+ match self {
+ List(vec) => {
+ let mut new_vec = Vec::with_capacity(vec.len());
+ for v in vec {
+ match v {
+ SRational(numerator, denominator) => {
+ new_vec.push(numerator.into());
+ new_vec.push(denominator.into());
+ }
+ SRationalBig(numerator, denominator) => {
+ new_vec.push(numerator);
+ new_vec.push(denominator);
+ }
+ _ => new_vec.push(v.into_i64()?),
+ }
+ }
+ Ok(new_vec)
+ }
+ Signed(val) => Ok(vec![val.into()]),
+ SignedBig(val) => Ok(vec![val]),
+ SRational(numerator, denominator) => Ok(vec![numerator.into(), denominator.into()]),
+ SRationalBig(numerator, denominator) => Ok(vec![numerator, denominator]),
+ val => Err(TiffError::FormatError(
+ TiffFormatError::SignedIntegerExpected(val),
+ )),
+ }
+ }
+}
+
+#[derive(Clone)]
+pub struct Entry {
+ type_: Type,
+ count: u64,
+ offset: [u8; 8],
+}
+
+impl ::std::fmt::Debug for Entry {
+ fn fmt(&self, fmt: &mut ::std::fmt::Formatter) -> Result<(), ::std::fmt::Error> {
+ fmt.write_str(&format!(
+ "Entry {{ type_: {:?}, count: {:?}, offset: {:?} }}",
+ self.type_, self.count, &self.offset
+ ))
+ }
+}
+
+impl Entry {
+ pub fn new(type_: Type, count: u32, offset: [u8; 4]) -> Entry {
+ let mut offset = offset.to_vec();
+ offset.append(&mut vec![0; 4]);
+ Entry::new_u64(type_, count.into(), offset[..].try_into().unwrap())
+ }
+
+ pub fn new_u64(type_: Type, count: u64, offset: [u8; 8]) -> Entry {
+ Entry {
+ type_,
+ count,
+ offset,
+ }
+ }
+
+ /// Returns a mem_reader for the offset/value field
+ fn r(&self, byte_order: ByteOrder) -> SmartReader<io::Cursor<Vec<u8>>> {
+ SmartReader::wrap(io::Cursor::new(self.offset.to_vec()), byte_order)
+ }
+
+ pub fn val<R: Read + Seek>(
+ &self,
+ limits: &super::Limits,
+ bigtiff: bool,
+ reader: &mut SmartReader<R>,
+ ) -> TiffResult<Value> {
+ // Case 1: there are no values so we can return immediately.
+ if self.count == 0 {
+ return Ok(List(Vec::new()));
+ }
+
+ let bo = reader.byte_order();
+
+ let tag_size = match self.type_ {
+ Type::BYTE | Type::SBYTE | Type::ASCII | Type::UNDEFINED => 1,
+ Type::SHORT | Type::SSHORT => 2,
+ Type::LONG | Type::SLONG | Type::FLOAT | Type::IFD => 4,
+ Type::LONG8
+ | Type::SLONG8
+ | Type::DOUBLE
+ | Type::RATIONAL
+ | Type::SRATIONAL
+ | Type::IFD8 => 8,
+ };
+
+ let value_bytes = match self.count.checked_mul(tag_size) {
+ Some(n) => n,
+ None => {
+ return Err(TiffError::LimitsExceeded);
+ }
+ };
+
+ // Case 2: there is one value.
+ if self.count == 1 {
+ // 2a: the value is 5-8 bytes and we're in BigTiff mode.
+ if bigtiff && value_bytes > 4 && value_bytes <= 8 {
+ return Ok(match self.type_ {
+ Type::LONG8 => UnsignedBig(self.r(bo).read_u64()?),
+ Type::SLONG8 => SignedBig(self.r(bo).read_i64()?),
+ Type::DOUBLE => Double(self.r(bo).read_f64()?),
+ Type::RATIONAL => {
+ let mut r = self.r(bo);
+ Rational(r.read_u32()?, r.read_u32()?)
+ }
+ Type::SRATIONAL => {
+ let mut r = self.r(bo);
+ SRational(r.read_i32()?, r.read_i32()?)
+ }
+ Type::IFD8 => IfdBig(self.r(bo).read_u64()?),
+ Type::BYTE
+ | Type::SBYTE
+ | Type::ASCII
+ | Type::UNDEFINED
+ | Type::SHORT
+ | Type::SSHORT
+ | Type::LONG
+ | Type::SLONG
+ | Type::FLOAT
+ | Type::IFD => unreachable!(),
+ });
+ }
+
+ // 2b: the value is at most 4 bytes or doesn't fit in the offset field.
+ return Ok(match self.type_ {
+ Type::BYTE => Unsigned(u32::from(self.offset[0])),
+ Type::SBYTE => Signed(i32::from(self.offset[0] as i8)),
+ Type::UNDEFINED => Byte(self.offset[0]),
+ Type::SHORT => Unsigned(u32::from(self.r(bo).read_u16()?)),
+ Type::SSHORT => Signed(i32::from(self.r(bo).read_i16()?)),
+ Type::LONG => Unsigned(self.r(bo).read_u32()?),
+ Type::SLONG => Signed(self.r(bo).read_i32()?),
+ Type::FLOAT => Float(self.r(bo).read_f32()?),
+ Type::ASCII => {
+ if self.offset[0] == 0 {
+ Ascii("".to_string())
+ } else {
+ return Err(TiffError::FormatError(TiffFormatError::InvalidTag));
+ }
+ }
+ Type::LONG8 => {
+ reader.goto_offset(self.r(bo).read_u32()?.into())?;
+ UnsignedBig(reader.read_u64()?)
+ }
+ Type::SLONG8 => {
+ reader.goto_offset(self.r(bo).read_u32()?.into())?;
+ SignedBig(reader.read_i64()?)
+ }
+ Type::DOUBLE => {
+ reader.goto_offset(self.r(bo).read_u32()?.into())?;
+ Double(reader.read_f64()?)
+ }
+ Type::RATIONAL => {
+ reader.goto_offset(self.r(bo).read_u32()?.into())?;
+ Rational(reader.read_u32()?, reader.read_u32()?)
+ }
+ Type::SRATIONAL => {
+ reader.goto_offset(self.r(bo).read_u32()?.into())?;
+ SRational(reader.read_i32()?, reader.read_i32()?)
+ }
+ Type::IFD => Ifd(self.r(bo).read_u32()?),
+ Type::IFD8 => {
+ reader.goto_offset(self.r(bo).read_u32()?.into())?;
+ IfdBig(reader.read_u64()?)
+ }
+ });
+ }
+
+ // Case 3: There is more than one value, but it fits in the offset field.
+ if value_bytes <= 4 || bigtiff && value_bytes <= 8 {
+ match self.type_ {
+ Type::BYTE => return offset_to_bytes(self.count as usize, self),
+ Type::SBYTE => return offset_to_sbytes(self.count as usize, self),
+ Type::ASCII => {
+ let mut buf = vec![0; self.count as usize];
+ self.r(bo).read_exact(&mut buf)?;
+ if buf.is_ascii() && buf.ends_with(&[0]) {
+ let v = str::from_utf8(&buf)?;
+ let v = v.trim_matches(char::from(0));
+ return Ok(Ascii(v.into()));
+ } else {
+ return Err(TiffError::FormatError(TiffFormatError::InvalidTag));
+ }
+ }
+ Type::UNDEFINED => {
+ return Ok(List(
+ self.offset[0..self.count as usize]
+ .iter()
+ .map(|&b| Byte(b))
+ .collect(),
+ ));
+ }
+ Type::SHORT => {
+ let mut r = self.r(bo);
+ let mut v = Vec::new();
+ for _ in 0..self.count {
+ v.push(Short(r.read_u16()?));
+ }
+ return Ok(List(v));
+ }
+ Type::SSHORT => {
+ let mut r = self.r(bo);
+ let mut v = Vec::new();
+ for _ in 0..self.count {
+ v.push(Signed(i32::from(r.read_i16()?)));
+ }
+ return Ok(List(v));
+ }
+ Type::LONG => {
+ let mut r = self.r(bo);
+ let mut v = Vec::new();
+ for _ in 0..self.count {
+ v.push(Unsigned(r.read_u32()?));
+ }
+ return Ok(List(v));
+ }
+ Type::SLONG => {
+ let mut r = self.r(bo);
+ let mut v = Vec::new();
+ for _ in 0..self.count {
+ v.push(Signed(r.read_i32()?));
+ }
+ return Ok(List(v));
+ }
+ Type::FLOAT => {
+ let mut r = self.r(bo);
+ let mut v = Vec::new();
+ for _ in 0..self.count {
+ v.push(Float(r.read_f32()?));
+ }
+ return Ok(List(v));
+ }
+ Type::IFD => {
+ let mut r = self.r(bo);
+ let mut v = Vec::new();
+ for _ in 0..self.count {
+ v.push(Ifd(r.read_u32()?));
+ }
+ return Ok(List(v));
+ }
+ Type::LONG8
+ | Type::SLONG8
+ | Type::RATIONAL
+ | Type::SRATIONAL
+ | Type::DOUBLE
+ | Type::IFD8 => {
+ unreachable!()
+ }
+ }
+ }
+
+ // Case 4: there is more than one value, and it doesn't fit in the offset field.
+ match self.type_ {
+ // TODO check if this could give wrong results
+ // at a different endianess of file/computer.
+ Type::BYTE => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ let mut buf = [0; 1];
+ reader.read_exact(&mut buf)?;
+ Ok(UnsignedBig(u64::from(buf[0])))
+ }),
+ Type::SBYTE => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(SignedBig(i64::from(reader.read_i8()? as i8)))
+ }),
+ Type::SHORT => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(UnsignedBig(u64::from(reader.read_u16()?)))
+ }),
+ Type::SSHORT => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(SignedBig(i64::from(reader.read_i16()?)))
+ }),
+ Type::LONG => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(Unsigned(reader.read_u32()?))
+ }),
+ Type::SLONG => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(Signed(reader.read_i32()?))
+ }),
+ Type::FLOAT => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(Float(reader.read_f32()?))
+ }),
+ Type::DOUBLE => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(Double(reader.read_f64()?))
+ }),
+ Type::RATIONAL => {
+ self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(Rational(reader.read_u32()?, reader.read_u32()?))
+ })
+ }
+ Type::SRATIONAL => {
+ self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(SRational(reader.read_i32()?, reader.read_i32()?))
+ })
+ }
+ Type::LONG8 => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(UnsignedBig(reader.read_u64()?))
+ }),
+ Type::SLONG8 => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(SignedBig(reader.read_i64()?))
+ }),
+ Type::IFD => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(Ifd(reader.read_u32()?))
+ }),
+ Type::IFD8 => self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ Ok(IfdBig(reader.read_u64()?))
+ }),
+ Type::UNDEFINED => {
+ self.decode_offset(self.count, bo, bigtiff, limits, reader, |reader| {
+ let mut buf = [0; 1];
+ reader.read_exact(&mut buf)?;
+ Ok(Byte(buf[0]))
+ })
+ }
+ Type::ASCII => {
+ let n = usize::try_from(self.count)?;
+ if n > limits.decoding_buffer_size {
+ return Err(TiffError::LimitsExceeded);
+ }
+
+ if bigtiff {
+ reader.goto_offset(self.r(bo).read_u64()?)?
+ } else {
+ reader.goto_offset(self.r(bo).read_u32()?.into())?
+ }
+
+ let mut out = vec![0; n];
+ 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(Ascii(String::from_utf8(out)?))
+ }
+ }
+ }
+
+ #[inline]
+ fn decode_offset<R, F>(
+ &self,
+ value_count: u64,
+ bo: ByteOrder,
+ bigtiff: bool,
+ limits: &super::Limits,
+ reader: &mut SmartReader<R>,
+ decode_fn: F,
+ ) -> TiffResult<Value>
+ where
+ R: Read + Seek,
+ F: Fn(&mut SmartReader<R>) -> TiffResult<Value>,
+ {
+ let value_count = usize::try_from(value_count)?;
+ if value_count > limits.decoding_buffer_size / mem::size_of::<Value>() {
+ return Err(TiffError::LimitsExceeded);
+ }
+
+ let mut v = Vec::with_capacity(value_count);
+
+ let offset = if bigtiff {
+ self.r(bo).read_u64()?
+ } else {
+ self.r(bo).read_u32()?.into()
+ };
+ reader.goto_offset(offset)?;
+
+ for _ in 0..value_count {
+ v.push(decode_fn(reader)?)
+ }
+ Ok(List(v))
+ }
+}
+
+/// Extracts a list of BYTE tags stored in an offset
+#[inline]
+fn offset_to_bytes(n: usize, entry: &Entry) -> TiffResult<Value> {
+ Ok(List(
+ entry.offset[0..n]
+ .iter()
+ .map(|&e| Unsigned(u32::from(e)))
+ .collect(),
+ ))
+}
+
+/// Extracts a list of SBYTE tags stored in an offset
+#[inline]
+fn offset_to_sbytes(n: usize, entry: &Entry) -> TiffResult<Value> {
+ Ok(List(
+ entry.offset[0..n]
+ .iter()
+ .map(|&e| Signed(i32::from(e as i8)))
+ .collect(),
+ ))
+}
+
+/// Type representing an Image File Directory
+pub type Directory = HashMap<Tag, Entry>;
Copyright © 2024 Valentin A. Popov. All Rights Reverse Engineered.