Update release notes for alpha release for BigTIFF

TileOffsets and TileByteCounts have the LONG8 type on bigtiff.

CHANGES.md

@@ -1,3 +1,21 @@
+# Version 0.6.0-alpha
+
+* Support for decoding BigTIFF with 64-bit offsets
+* Better support for adding auxiliary tags before encoding image data
+* Fixed decoding of inline ASCII in tags
+* Fixed handling after null terminator in ASCII data
+* Recognize tile and sample format tags
+* Note: these notes will be merged into 0.6.0 when it is released
+
+# Version 0.5.0
+
+* Added support for 32-bit and 64-bit decoded values.
+* Added CMYK(16|32|64) color type support.
+* Check many internal integer conversions to increase stability. This should
+  only lead to images being reported as faulty that would previously silently
+  break platform limits. If there are any false positives, please report them.
+* Remove an erroneous check of decoded length in lzw compressed images.
+
 # Version 0.4.0
 
 * Several enumerations are now non_exhaustive for future extensions.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tiff"
-version = "0.4.0"
+version = "0.6.0-alpha"
 authors = [
     "ccgn",
     "bvssvni <bvssvni@gmail.com>",

src/decoder/ifd.rs

@@ -1,7 +1,7 @@
 //! Function for reading TIFF tags
 
 use std::collections::HashMap;
-use std::convert::TryFrom;
+use std::convert::{TryInto, TryFrom};
 use std::io::{self, Read, Seek};
 use std::mem;
 
@@ -9,17 +9,21 @@ use super::stream::{ByteOrder, EndianReader, SmartReader};
 use tags::{Tag, Type};
 use {TiffError, TiffFormatError, TiffResult, TiffUnsupportedError};
 
-use self::Value::{Ascii, List, Rational, Unsigned, Signed, SRational};
+use self::Value::{Ascii, List, Rational, Unsigned, Signed, SRational, RationalBig, UnsignedBig, SignedBig, SRationalBig};
 
 
 #[allow(unused_qualifications)]
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum Value {
     Signed(i32),
+    SignedBig(i64),
     Unsigned(u32),
+    UnsignedBig(u64),
     List(Vec<Value>),
     Rational(u32, u32),
+    RationalBig(u64, u64),
     SRational(i32, i32),
+    SRationalBig(i64, i64),
     Ascii(String),
     #[doc(hidden)] // Do not match against this.
     __NonExhaustive,
@@ -29,6 +33,7 @@ impl Value {
     pub fn into_u32(self) -> TiffResult<u32> {
         match self {
             Unsigned(val) => Ok(val),
+            UnsignedBig(val) => Ok(u32::try_from(val)?),
             val => Err(TiffError::FormatError(
                 TiffFormatError::UnsignedIntegerExpected(val),
             )),
@@ -38,6 +43,27 @@ impl Value {
     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 {
+            Unsigned(val) => Ok(val.into()),
+            UnsignedBig(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),
             )),
@@ -54,7 +80,9 @@ impl Value {
                 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)?]),
             Ascii(val) => Ok(val.chars().map(u32::from).collect()),
             val => Err(TiffError::FormatError(
                 TiffFormatError::UnsignedIntegerExpected(val),
@@ -72,25 +100,80 @@ impl Value {
                             new_vec.push(numerator);
                             new_vec.push(denominator);
                         }
-                        _ => new_vec.push(v.into_i32()?)
+                        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_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]),
+            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: u32,
-    offset: [u8; 4],
+    count: u64,
+    offset: [u8; 8],
 }
 
 impl ::std::fmt::Debug for Entry {
@@ -104,6 +187,12 @@ impl ::std::fmt::Debug for Entry {
 
 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,
@@ -122,94 +211,172 @@ impl Entry {
         decoder: &mut super::Decoder<R>,
     ) -> TiffResult<Value> {
         let bo = decoder.byte_order();
-        match (self.type_, self.count) {
-            // TODO check if this could give wrong results
-            // at a different endianess of file/computer.
-            (Type::BYTE, 1) => Ok(Unsigned(u32::from(self.offset[0]))),
-            (Type::BYTE, 2) => offset_to_bytes(2, self),
-            (Type::BYTE, 3) => offset_to_bytes(3, self),
-            (Type::BYTE, 4) => offset_to_bytes(4, self),
-            (Type::BYTE, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
-                Ok(Unsigned(u32::from(decoder.read_byte()?)))
-            }),
-            (Type::SBYTE, 1) => Ok(Signed(i32::from(self.offset[0] as i8))),
-            (Type::SBYTE, 2) => offset_to_sbytes(2, self),
-            (Type::SBYTE, 3) => offset_to_sbytes(3, self),
-            (Type::SBYTE, 4) => offset_to_sbytes(4, self),
-            (Type::SBYTE, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
-                Ok(Signed(i32::from(decoder.read_byte()? as i8)))
-            }),
-            (Type::SHORT, 1) => Ok(Unsigned(u32::from(self.r(bo).read_u16()?))),
-            (Type::SSHORT, 1) => Ok(Signed(i32::from(self.r(bo).read_i16()?))),
-            (Type::SHORT, 2) => {
-                let mut r = self.r(bo);
-                Ok(List(vec![
-                    Unsigned(u32::from(r.read_u16()?)),
-                    Unsigned(u32::from(r.read_u16()?)),
-                ]))
-            }
-            (Type::SSHORT, 2) => {
-                let mut r = self.r(bo);
-                Ok(List(vec![
-                    Signed(i32::from(r.read_i16()?)),
-                    Signed(i32::from(r.read_i16()?)),
-                ]))
-            }
-            (Type::SHORT, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
-                Ok(Unsigned(u32::from(decoder.read_short()?)))
-            }),
-            (Type::SSHORT, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
-                Ok(Signed(i32::from(decoder.read_sshort()?)))
-            }),
-            (Type::LONG, 1) => Ok(Unsigned(self.r(bo).read_u32()?)),
-            (Type::SLONG, 1) => Ok(Signed(self.r(bo).read_i32()?)),
-            (Type::LONG, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
-                Ok(Unsigned(decoder.read_long()?))
-            }),
-            (Type::SLONG, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
-                Ok(Signed(decoder.read_slong()?))
-            }),
-            (Type::RATIONAL, 1) => {
-                decoder.goto_offset(self.r(bo).read_u32()?)?;
-                let numerator = decoder.read_long()?;
-                let denominator = decoder.read_long()?;
-                Ok(Rational(numerator, denominator))
-            }
-            (Type::SRATIONAL, 1) => {
-                decoder.goto_offset(self.r(bo).read_u32()?)?;
-                let numerator = decoder.read_slong()?;
-                let denominator = decoder.read_slong()?;
-                Ok(SRational(numerator, denominator))
-            }
-            (Type::RATIONAL, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
-                Ok(Rational(
-                    decoder.read_long()?,
-                    decoder.read_long()?,
-                ))
-            }),
-            (Type::SRATIONAL, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
-                Ok(SRational(
-                    decoder.read_slong()?,
-                    decoder.read_slong()?,
-                ))
-            }),
-            (Type::ASCII, n) => {
-                let n = usize::try_from(n)?;
-                if n > limits.decoding_buffer_size {
-                    return Err(TiffError::LimitsExceeded);
+        let bigtiff_value = if decoder.bigtiff {
+            match (self.type_, self.count) {
+                (Type::BYTE, 5) => Some(offset_to_bytes(5, self)?),
+                (Type::BYTE, 6) => Some(offset_to_bytes(6, self)?),
+                (Type::BYTE, 7) => Some(offset_to_bytes(7, self)?),
+                (Type::BYTE, 8) => Some(offset_to_bytes(8, self)?),
+                (Type::SBYTE, 5) => Some(offset_to_sbytes(5, self)?),
+                (Type::SBYTE, 6) => Some(offset_to_sbytes(6, self)?),
+                (Type::SBYTE, 7) => Some(offset_to_sbytes(7, self)?),
+                (Type::SBYTE, 8) => Some(offset_to_sbytes(8, self)?),
+                (Type::SHORT, 3) => {
+                    let mut r = self.r(bo);
+                    Some(List(vec![
+                        Unsigned(u32::from(r.read_u16()?)),
+                        Unsigned(u32::from(r.read_u16()?)),
+                        Unsigned(u32::from(r.read_u16()?)),
+                    ]))
                 }
-                decoder.goto_offset(self.r(bo).read_u32()?)?;
-                let string = decoder.read_string(n)?;
-                Ok(Ascii(string))
+                (Type::SSHORT, 3) => {
+                    let mut r = self.r(bo);
+                    Some(List(vec![
+                        Signed(i32::from(r.read_i16()?)),
+                        Signed(i32::from(r.read_i16()?)),
+                        Signed(i32::from(r.read_i16()?)),
+                    ]))
+                }
+                (Type::SHORT, 4) => {
+                    let mut r = self.r(bo);
+                    Some(List(vec![
+                        Unsigned(u32::from(r.read_u16()?)),
+                        Unsigned(u32::from(r.read_u16()?)),
+                        Unsigned(u32::from(r.read_u16()?)),
+                        Unsigned(u32::from(r.read_u16()?)),
+                    ]))
+                }
+                (Type::SSHORT, 4) => {
+                    let mut r = self.r(bo);
+                    Some(List(vec![
+                        Signed(i32::from(r.read_i16()?)),
+                        Signed(i32::from(r.read_i16()?)),
+                        Signed(i32::from(r.read_i16()?)),
+                        Signed(i32::from(r.read_i16()?)),
+                    ]))
+                }
+                (Type::LONG, 2) => {
+                    let mut r = self.r(bo);
+                    Some(List(vec![
+                        Unsigned(r.read_u32()?),
+                        Unsigned(r.read_u32()?),
+                    ]))
+                }
+                (Type::SLONG, 2) => {
+                    let mut r = self.r(bo);
+                    Some(List(vec![
+                        Signed(r.read_i32()?),
+                        Signed(r.read_i32()?),
+                    ]))
+                }
+                (Type::RATIONAL, 1) => {
+                    let mut r = self.r(bo);
+                    let numerator = r.read_u32()?;
+                    let denominator = r.read_u32()?;
+                    Some(Rational(numerator, denominator))
+                }
+                (Type::SRATIONAL, 1) => {
+                    let mut r = self.r(bo);
+                    let numerator = r.read_i32()?;
+                    let denominator = r.read_i32()?;
+                    Some(SRational(numerator, denominator))
+                }
+                _ => None
+            }
+        } else {
+            None
+        };
+
+        if let Some(v) = bigtiff_value {
+            Ok(v)
+        } else {
+            match (self.type_, self.count) {
+                // TODO check if this could give wrong results
+                // at a different endianess of file/computer.
+                (Type::BYTE, 1) => Ok(Unsigned(u32::from(self.offset[0]))),
+                (Type::BYTE, 2) => offset_to_bytes(2, self),
+                (Type::BYTE, 3) => offset_to_bytes(3, self),
+                (Type::BYTE, 4) => offset_to_bytes(4, self),
+                (Type::BYTE, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
+                    Ok(UnsignedBig(u64::from(decoder.read_byte()?)))
+                }),
+                (Type::SBYTE, 1) => Ok(Signed(i32::from(self.offset[0] as i8))),
+                (Type::SBYTE, 2) => offset_to_sbytes(2, self),
+                (Type::SBYTE, 3) => offset_to_sbytes(3, self),
+                (Type::SBYTE, 4) => offset_to_sbytes(4, self),
+                (Type::SBYTE, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
+                    Ok(SignedBig(i64::from(decoder.read_byte()? as i8)))
+                }),
+                (Type::SHORT, 1) => Ok(Unsigned(u32::from(self.r(bo).read_u16()?))),
+                (Type::SSHORT, 1) => Ok(Signed(i32::from(self.r(bo).read_i16()?))),
+                (Type::SHORT, 2) => {
+                    let mut r = self.r(bo);
+                    Ok(List(vec![
+                        Unsigned(u32::from(r.read_u16()?)),
+                        Unsigned(u32::from(r.read_u16()?)),
+                    ]))
+                }
+                (Type::SSHORT, 2) => {
+                    let mut r = self.r(bo);
+                    Ok(List(vec![
+                        Signed(i32::from(r.read_i16()?)),
+                        Signed(i32::from(r.read_i16()?)),
+                    ]))
+                }
+                (Type::SHORT, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
+                    Ok(UnsignedBig(u64::from(decoder.read_short()?)))
+                }),
+                (Type::SSHORT, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
+                    Ok(SignedBig(i64::from(decoder.read_sshort()?)))
+                }),
+                (Type::LONG, 1) => Ok(Unsigned(self.r(bo).read_u32()?)),
+                (Type::SLONG, 1) => Ok(Signed(self.r(bo).read_i32()?)),
+                (Type::LONG, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
+                    Ok(Unsigned(decoder.read_long()?))
+                }),
+                (Type::SLONG, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
+                    Ok(Signed(decoder.read_slong()?))
+                }),
+                (Type::RATIONAL, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
+                    Ok(Rational(decoder.read_long()?, decoder.read_long()?))
+                }),
+                (Type::SRATIONAL, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
+                    Ok(SRational(decoder.read_slong()?, decoder.read_slong()?))
+                }),
+                (Type::LONG8, n) => self.decode_offset(n, bo, limits, decoder, |decoder| {
+                    Ok(UnsignedBig(decoder.read_long8()?))
+                }),
+                (Type::ASCII, n) => {
+                    let n = usize::try_from(n)?;
+                    if n > limits.decoding_buffer_size {
+                        return Err(TiffError::LimitsExceeded);
+                    }
+                    
+                    if (n <= 4 && !decoder.bigtiff) || (n <= 8 && decoder.bigtiff) {
+                        let mut buf = vec![0; n];
+                        self.r(bo).read_exact(&mut buf )?;
+                        let v = String::from_utf8(buf)?;
+                        let v = v.trim_matches(char::from(0));
+                        Ok(Ascii(v.into()))
+                    } else {
+                        if decoder.bigtiff {
+                            decoder.goto_offset_u64(self.r(bo).read_u64()?)?
+                        } else {
+                            decoder.goto_offset(self.r(bo).read_u32()?)?
+                        }
+                        let string = decoder.read_string(n)?;
+                        Ok(Ascii(string))
+                    }
+                }
+                _ => Err(TiffError::UnsupportedError(
+                    TiffUnsupportedError::UnsupportedDataType,
+                )),
             }
-            _ => Err(TiffError::UnsupportedError(
-                TiffUnsupportedError::UnsupportedDataType,
-            )),
         }
     }
 
     #[inline]
-    fn decode_offset<R, F>(&self, value_count: u32, bo: ByteOrder, limits: &super::Limits, decoder: &mut super::Decoder<R>, decode_fn: F) -> TiffResult<Value>
+    fn decode_offset<R, F>(&self, value_count: u64, bo: ByteOrder, limits: &super::Limits, decoder: &mut super::Decoder<R>, decode_fn: F) -> TiffResult<Value>
         where
             R: Read + Seek,
             F: Fn(&mut super::Decoder<R>) -> TiffResult<Value>,
@@ -220,7 +387,11 @@ impl Entry {
         }
 
         let mut v = Vec::with_capacity(value_count);
-        decoder.goto_offset(self.r(bo).read_u32()?)?;
+        if decoder.bigtiff {
+            decoder.goto_offset_u64(self.r(bo).read_u64()?)?
+        } else {
+            decoder.goto_offset(self.r(bo).read_u32()?)?
+        }
         for _ in 0..value_count {
             v.push(decode_fn(decoder)?)
         }

src/decoder/mod.rs

@@ -116,8 +116,8 @@ impl<'a> DecodingBuffer<'a> {
 #[derive(Debug)]
 struct StripDecodeState {
     strip_index: usize,
-    strip_offsets: Vec<u32>,
-    strip_bytes: Vec<u32>,
+    strip_offsets: Vec<u64>,
+    strip_bytes: Vec<u64>,
 }
 
 /// Decoding limits
@@ -157,8 +157,9 @@ where
 {
     reader: SmartReader<R>,
     byte_order: ByteOrder,
+    bigtiff: bool,
     limits: Limits,
-    next_ifd: Option<u32>,
+    next_ifd: Option<u64>,
     ifd: Option<Directory>,
     width: u32,
     height: u32,
@@ -248,6 +249,7 @@ impl<R: Read + Seek> Decoder<R> {
         Decoder {
             reader: SmartReader::wrap(r, ByteOrder::LittleEndian),
             byte_order: ByteOrder::LittleEndian,
+            bigtiff: false,
             limits: Default::default(),
             next_ifd: None,
             ifd: None,
@@ -330,12 +332,28 @@ impl<R: Read + Seek> Decoder<R> {
                 ))
             }
         }
-        if self.read_short()? != 42 {
-            return Err(TiffError::FormatError(
+        match self.read_short()? {
+            42 => self.bigtiff = false,
+            43 => {
+                self.bigtiff = true;
+                // Read bytesize of offsets (in bigtiff it's alway 8 but provide a way to move to 16 some day)
+                if self.read_short()? != 8 {
+                    return Err(TiffError::FormatError(
+                        TiffFormatError::TiffSignatureNotFound,
+                    ))
+                }
+                // This constant should always be 0
+                if self.read_short()? != 0 {
+                    return Err(TiffError::FormatError(
+                        TiffFormatError::TiffSignatureNotFound,
+                    ))
+                }
+            },
+            _ => return Err(TiffError::FormatError(
                 TiffFormatError::TiffSignatureInvalid,
-            ));
+            ))
         }
-        self.next_ifd = match self.read_long()? {
+        self.next_ifd = match self.read_ifd_offset()? {
             0 => None,
             n => Some(n),
         };
@@ -389,6 +407,15 @@ impl<R: Read + Seek> Decoder<R> {
         self.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> {
@@ -421,29 +448,53 @@ impl<R: Read + Seek> Decoder<R> {
         self.reader.read_i32()
     }
 
+    #[inline]
+    pub fn read_long8(&mut self) -> Result<u64, io::Error> {
+        self.reader.read_u64()
+    }
+
+
     /// Reads a string
     #[inline]
     pub fn read_string(&mut self, length: usize) -> TiffResult<String> {
-        let mut out = String::with_capacity(length);
-        self.reader.read_to_string(&mut out)?;
+        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
-        let trimmed = out.bytes().take_while(|&n| n != 0).collect::<Vec<u8>>();
-        Ok(String::from_utf8(trimmed)?)
+        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) -> Result<[u8; 4], io::Error> {
+    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(u64::from(offset)))
+            .seek(io::SeekFrom::Start(offset))
             .map(|_| ())
     }
 
@@ -465,13 +516,22 @@ impl<R: Read + Seek> Decoder<R> {
                 return Ok(None);
             }
         };
-        Ok(Some((
-            tag,
+        let entry = if self.bigtiff {
+            ifd::Entry::new_u64(
+                type_,
+                self.read_long8()?,
+                self.read_offset_u64()?
+            )
+        } else {
             ifd::Entry::new(
                 type_,
-                self.read_long()?,   // count
-                self.read_offset()?, // offset
-            ),
+                self.read_long()?, 
+                self.read_offset()?
+            )
+        };
+        Ok(Some((
+            tag,
+            entry,
         )))
     }
 
@@ -484,16 +544,17 @@ impl<R: Read + Seek> Decoder<R> {
                     TiffFormatError::ImageFileDirectoryNotFound,
                 ))
             }
-            Some(offset) => self.goto_offset(offset)?,
+            Some(offset) => self.goto_offset_u64(offset)?,
         }
-        for _ in 0..self.read_short()? {
+        let num_tags = if self.bigtiff { self.read_long8()? } else { self.read_short()?.into() };
+        for _ in 0..num_tags {
             let (tag, entry) = match self.read_entry()? {
                 Some(val) => val,
                 None => continue, // Unknown data type in tag, skip
             };
             dir.insert(tag, entry);
         }
-        self.next_ifd = match self.read_long()? {
+        self.next_ifd = match self.read_ifd_offset()? {
             0 => None,
             n => Some(n),
         };
@@ -514,9 +575,9 @@ impl<R: Read + Seek> Decoder<R> {
     }
 
     /// Tries to retrieve a tag and convert it to the desired unsigned type.
-    pub fn find_tag_unsigned<T: TryFrom<u32>>(&mut self, tag: Tag) -> TiffResult<Option<T>> {
+    pub fn find_tag_unsigned<T: TryFrom<u64>>(&mut self, tag: Tag) -> TiffResult<Option<T>> {
         self.find_tag(tag)?
-            .map(|v| v.into_u32()).transpose()?
+            .map(|v| v.into_u64()).transpose()?
             .map(|value| T::try_from(value)
                 .map_err(|_| TiffFormatError::InvalidTagValueType(tag).into()))
             .transpose()
@@ -524,9 +585,9 @@ impl<R: Read + Seek> Decoder<R> {
 
     /// 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<u32>>(&mut self, tag: Tag) -> TiffResult<Option<Vec<T>>> {
+    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_u32_vec()).transpose()?
+            .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())
@@ -535,7 +596,7 @@ impl<R: Read + Seek> Decoder<R> {
 
     /// 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<u32>>(&mut self, tag: Tag) -> TiffResult<T> {
+    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())
     }
@@ -555,24 +616,30 @@ impl<R: Read + Seek> Decoder<R> {
     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_u32_vec(&mut self, tag: Tag) -> TiffResult<Vec<u32>> {
         self.get_tag(tag)?.into_u32_vec()
     }
+    pub fn get_tag_u64_vec(&mut self, tag: Tag) -> TiffResult<Vec<u64>> {
+        self.get_tag(tag)?.into_u64_vec()
+    }
 
     /// Decompresses the strip into the supplied buffer.
     /// Returns the number of bytes read.
     fn expand_strip<'a>(
         &mut self,
         buffer: DecodingBuffer<'a>,
-        offset: u32,
-        length: u32,
+        offset: u64,
+        length: u64,
         max_uncompressed_length: usize,
     ) -> TiffResult<usize> {
         let color_type = self.colortype()?;
-        self.goto_offset(offset)?;
-        let (bytes, mut reader): (usize, Box<EndianReader>) = match self.compression_method {
+        self.goto_offset_u64(offset)?;
+        let (bytes, mut reader): (usize, Box<dyn EndianReader>) = match self.compression_method {
             CompressionMethod::None => {
                 let order = self.reader.byte_order;
                 (
@@ -584,7 +651,7 @@ impl<R: Read + Seek> Decoder<R> {
                 let (bytes, reader) = LZWReader::new(
                     &mut self.reader,
                     usize::try_from(length)?,
-                    max_uncompressed_length
+                    max_uncompressed_length * buffer.byte_len()
                 )?;
                 (bytes, Box::new(reader))
             }
@@ -698,8 +765,8 @@ impl<R: Read + Seek> Decoder<R> {
 
     fn initialize_strip_decoder(&mut self) -> TiffResult<()> {
         if self.strip_decoder.is_none() {
-            let strip_offsets = self.get_tag_u32_vec(Tag::StripOffsets)?;
-            let strip_bytes = self.get_tag_u32_vec(Tag::StripByteCounts)?;
+            let strip_offsets = self.get_tag_u64_vec(Tag::StripOffsets)?;
+            let strip_bytes = self.get_tag_u64_vec(Tag::StripByteCounts)?;
 
             self.strip_decoder = Some(StripDecodeState {
                 strip_index: 0,
@@ -744,7 +811,7 @@ impl<R: Read + Seek> Decoder<R> {
 
         let buffer_size = usize::try_from(self.width)? * strip_height * self.bits_per_sample.len();
 
-        if buffer.len() < buffer_size || usize::try_from(byte_count)? / buffer.byte_len() > buffer_size {
+        if buffer.len() < buffer_size {
             return Err(TiffError::FormatError(
                 TiffFormatError::InconsistentSizesEncountered,
             ));

src/encoder/mod.rs

@@ -407,26 +407,9 @@ impl<W: Write + Seek> TiffEncoder<W> {
     where
         [C::Inner]: TiffValue,
     {
-        let num_pix = usize::try_from(width)?.checked_mul(usize::try_from(height)?)
-            .ok_or_else(|| ::std::io::Error::new(
-                ::std::io::ErrorKind::InvalidInput,
-                "Image width * height exceeds usize"))?;
-        if data.len() < num_pix {
-            return Err(::std::io::Error::new(
-                ::std::io::ErrorKind::InvalidData,
-                "Input data slice is undersized for provided dimensions").into());
-        }
-
         let encoder = DirectoryEncoder::new(&mut self.writer)?;
-        let mut image: ImageEncoder<W, C> = ImageEncoder::new(encoder, width, height)?;
-
-        let mut idx = 0;
-        while image.next_strip_sample_count() > 0 {
-            let sample_count = usize::try_from(image.next_strip_sample_count())?;
-            image.write_strip(&data[idx..idx + sample_count])?;
-            idx += sample_count;
-        }
-        image.finish()
+        let image: ImageEncoder<W, C> = ImageEncoder::new(encoder, width, height)?;
+        image.write_data(data)
     }
 }
 
@@ -548,10 +531,14 @@ impl<'a, W: Write + Seek> Drop for DirectoryEncoder<'a, W> {
 /// # let mut file = std::io::Cursor::new(Vec::new());
 /// # let image_data = vec![0; 100*100*3];
 /// use tiff::encoder::*;
+/// use tiff::tags::Tag;
 ///
 /// let mut tiff = TiffEncoder::new(&mut file).unwrap();
 /// let mut image = tiff.new_image::<colortype::RGB8>(100, 100).unwrap();
 ///
+/// // You can encode tags here 
+/// image.encoder().write_tag(Tag::Artist, "Image-tiff").unwrap();
+///
 /// let mut idx = 0;
 /// while image.next_strip_sample_count() > 0 {
 ///     let sample_count = image.next_strip_sample_count() as usize;
@@ -561,11 +548,13 @@ impl<'a, W: Write + Seek> Drop for DirectoryEncoder<'a, W> {
 /// image.finish().unwrap();
 /// # }
 /// ```
+/// You can also call write_data function wich will encode by strip and finish
 pub struct ImageEncoder<'a, W: 'a + Write + Seek, C: ColorType> {
     encoder: DirectoryEncoder<'a, W>,
     strip_idx: u64,
     strip_count: u64,
     row_samples: u64,
+    width: u32,
     height: u32,
     rows_per_strip: u64,
     strip_offsets: Vec<u32>,
@@ -608,6 +597,7 @@ impl<'a, W: 'a + Write + Seek, T: ColorType> ImageEncoder<'a, W, T> {
             strip_idx: 0,
             row_samples,
             rows_per_strip,
+            width,
             height,
             strip_offsets: Vec::new(),
             strip_byte_count: Vec::new(),
@@ -652,6 +642,30 @@ impl<'a, W: 'a + Write + Seek, T: ColorType> ImageEncoder<'a, W, T> {
         Ok(())
     }
 
+    /// Write strips from data
+    pub fn write_data(mut self, data: &[T::Inner]) -> TiffResult<()>
+    where
+        [T::Inner]: TiffValue,
+    {
+        let num_pix = usize::try_from(self.width)?.checked_mul(usize::try_from(self.height)?)
+            .ok_or_else(|| ::std::io::Error::new(
+                ::std::io::ErrorKind::InvalidInput,
+                "Image width * height exceeds usize"))?;
+        if data.len() < num_pix {
+            return Err(::std::io::Error::new(
+                ::std::io::ErrorKind::InvalidData,
+                "Input data slice is undersized for provided dimensions").into());
+        }
+        let mut idx = 0;
+        while self.next_strip_sample_count() > 0 {
+            let sample_count = usize::try_from(self.next_strip_sample_count())?;
+            self.write_strip(&data[idx..idx + sample_count])?;
+            idx += sample_count;
+        }
+        self.finish()?;
+        Ok(())
+    }
+
     /// Set image resolution
     pub fn resolution(&mut self, unit: ResolutionUnit, value: Rational) {
         self.encoder.write_tag(Tag::ResolutionUnit, unit.to_u16()).unwrap();

src/lib.rs

@@ -4,7 +4,7 @@
 //! lossless and lossy compression.
 //!
 //! # Related Links
-//! * <http://partners.adobe.com/public/developer/tiff/index.html> - The TIFF specification
+//! * <https://www.adobe.io/open/standards/TIFF.html> - The TIFF specification
 
 extern crate byteorder;
 extern crate lzw;

src/tags.rs

@@ -105,6 +105,11 @@ pub enum Tag(u16) unknown("A private or extension tag") {
     YResolution = 283,
     // Advanced tags
     Predictor = 317,
+    TileWidth = 322,
+    TileLength = 323,
+    TileOffsets = 324,
+    TileByteCounts = 325,
+    SampleFormat = 339,
 }
 }
 

tests/decode_bigtiff_images.rs

@@ -0,0 +1,46 @@
+extern crate tiff;
+
+use tiff::decoder::Decoder;
+use tiff::tags::Tag;
+use tiff::ColorType;
+
+use std::fs::File;
+use std::path::PathBuf;
+
+const TEST_IMAGE_DIR: &str = "./tests/images/bigtiff";
+
+#[test]
+fn test_big_tiff() {
+    let filenames = ["BigTIFF.tif", "BigTIFFMotorola.tif", "BigTIFFLong.tif"];
+    for filename in filenames.iter() {
+        let path = PathBuf::from(TEST_IMAGE_DIR).join(filename);
+        let img_file = File::open(path).expect("Cannot find test image!");
+        let mut decoder = Decoder::new(img_file).expect("Cannot create decoder");
+        assert_eq!(
+            decoder.dimensions().expect("Cannot get dimensions"),
+            (64, 64)
+        );
+        assert_eq!(
+            decoder.colortype().expect("Cannot get colortype"),
+            ColorType::RGB(8)
+        );
+        assert_eq!(
+            decoder
+                .get_tag_u64(Tag::StripOffsets)
+                .expect("Cannot get StripOffsets"),
+            16
+        );
+        assert_eq!(
+            decoder
+                .get_tag_u64(Tag::RowsPerStrip)
+                .expect("Cannot get RowsPerStrip"),
+            64
+        );
+        assert_eq!(
+            decoder
+                .get_tag_u64(Tag::StripByteCounts)
+                .expect("Cannot get StripByteCounts"),
+            12288
+        )
+    }
+}

tests/decode_images.rs

@@ -149,6 +149,12 @@ fn test_decode_data() {
     }
 }
 
+#[test]
+fn issue_69() {
+    test_image_sum_u16("issue_69_lzw.tiff", ColorType::Gray(16), 1015486);
+    test_image_sum_u16("issue_69_packbits.tiff", ColorType::Gray(16), 1015486);
+}
+
 // TODO: GrayA support
 //#[test]
 //fn test_gray_alpha_u8()

tests/encode_images.rs

@@ -1,6 +1,6 @@
 extern crate tiff;
 
-use tiff::decoder::{Decoder, DecodingResult};
+use tiff::decoder::{Decoder, DecodingResult, ifd};
 use tiff::encoder::{colortype, TiffEncoder, SRational};
 use tiff::ColorType;
 use tiff::tags::Tag;
@@ -24,14 +24,18 @@ fn encode_decode() {
     {
         let mut tiff = TiffEncoder::new(&mut file).unwrap();
 
-        tiff.write_image::<colortype::RGB8>(100, 100, &image_data)
+        let mut image = tiff.new_image::<colortype::RGB8>(100, 100)
             .unwrap();
+        image.encoder().write_tag(Tag::Artist, "Image-tiff").unwrap();
+        image.write_data(&image_data).unwrap();
+
     }
     {
         file.seek(SeekFrom::Start(0)).unwrap();
         let mut decoder = Decoder::new(&mut file).unwrap();
         assert_eq!(decoder.colortype().unwrap(), ColorType::RGB(8));
         assert_eq!(decoder.dimensions().unwrap(), (100, 100));
+        assert_eq!(decoder.get_tag(Tag::Artist).unwrap(), ifd::Value::Ascii("Image-tiff".into()));
         if let DecodingResult::U8(img_res) = decoder.read_image().unwrap() {
             assert_eq!(image_data, img_res);
         } else {
@@ -259,4 +263,4 @@ fn test_multipage_image() {
         // check the dimensions of the image in the second page
         assert_eq!(img_decoder.dimensions().unwrap(), (3, 3));
     }
-}
+}