Changed to use u32 for chunk_index

src/decoder/image.rs

@@ -67,29 +67,29 @@ impl TileAttributes {
 pub struct ChunkInfo {
     /// Width of the chunk as specified (includes potential padding). This has the same
     /// value for all chunks in the image.
-    pub chunk_width: usize,
+    pub chunk_width: u32,
     /// Height/Length of the chunk as specified (includes potential padding). This has
     /// the same value for all chunks in the image.
-    pub chunk_height: usize,
+    pub chunk_height: u32,
 
     /// Width of the data (excluding potential padding). This can take different values
     /// on the right column of the image due to padding.
-    pub data_width: usize,
+    pub data_width: u32,
     /// Height/Length of the data (excluding potential padding). This can take different values
     /// on the bottom row of the image due to padding.
-    pub data_height: usize,
+    pub data_height: u32,
 }
 
 impl ChunkInfo {
     #[inline]
     /// Returns the amount of padding (pixles) on the right-side of the chunk.
-    pub fn padding_right(&self) -> usize {
+    pub fn padding_right(&self) -> u32 {
         self.chunk_width - self.data_width
     }
 
     #[inline]
     /// Returns the amount of padding (pixles) on the bottom-side of the chunk.
-    pub fn padding_down(&self) -> usize {
+    pub fn padding_down(&self) -> u32 {
         self.chunk_height - self.data_height
     }
 }
@@ -390,14 +390,20 @@ impl Image {
         })
     }
 
-    pub(crate) fn chunk_file_range(&self, chunk: usize) -> TiffResult<(u64, u64)> {
-        let file_offset = self.chunk_offsets.get(chunk).ok_or(TiffError::FormatError(
-            TiffFormatError::InconsistentSizesEncountered,
-        ))?;
+    pub(crate) fn chunk_file_range(&self, chunk: u32) -> TiffResult<(u64, u64)> {
+        let file_offset = self
+            .chunk_offsets
+            .get(chunk as usize)
+            .ok_or(TiffError::FormatError(
+                TiffFormatError::InconsistentSizesEncountered,
+            ))?;
 
-        let compressed_bytes = self.chunk_bytes.get(chunk).ok_or(TiffError::FormatError(
-            TiffFormatError::InconsistentSizesEncountered,
-        ))?;
+        let compressed_bytes =
+            self.chunk_bytes
+                .get(chunk as usize)
+                .ok_or(TiffError::FormatError(
+                    TiffFormatError::InconsistentSizesEncountered,
+                ))?;
 
         Ok((*file_offset, *compressed_bytes))
     }
@@ -416,42 +422,39 @@ impl Image {
         }
     }
 
-    pub(crate) fn chunk_info(&self, chunk_index: usize) -> Option<ChunkInfo> {
+    pub(crate) fn chunk_info(&self, chunk_index: u32) -> Option<ChunkInfo> {
         match &self.chunk_type {
             ChunkType::Strip => {
-                let rows_per_strip = self.strip_decoder.as_ref().unwrap().rows_per_strip as usize;
-
-                let sized_width = self.width as usize;
-                let sized_height = self.height as usize;
+                let rows_per_strip = self.strip_decoder.as_ref().unwrap().rows_per_strip;
 
                 let strip_height_without_padding = chunk_index
                     .checked_mul(rows_per_strip)
-                    .and_then(|x| sized_height.checked_sub(x))?;
+                    .and_then(|x| self.height.checked_sub(x))?;
 
                 // Ignore potential vertical padding on the bottommost strip
                 let strip_height = rows_per_strip.min(strip_height_without_padding);
 
                 Some(ChunkInfo {
-                    chunk_width: sized_width,
+                    chunk_width: self.width,
                     chunk_height: rows_per_strip,
 
-                    data_width: sized_width,
+                    data_width: self.width,
                     data_height: strip_height,
                 })
             }
             ChunkType::Tile => {
                 let tile_attrs = self.tile_attributes.as_ref().unwrap();
-                let (padding_right, padding_down) = tile_attrs.get_padding(chunk_index);
+                let (padding_right, padding_down) = tile_attrs.get_padding(chunk_index as usize);
 
                 let tile_width = tile_attrs.tile_width - padding_right;
                 let tile_length = tile_attrs.tile_length - padding_down;
 
                 Some(ChunkInfo {
-                    chunk_width: tile_attrs.tile_width,
-                    chunk_height: tile_attrs.tile_length,
+                    chunk_width: tile_attrs.tile_width as u32,
+                    chunk_height: tile_attrs.tile_length as u32,
 
-                    data_width: tile_width,
-                    data_height: tile_length,
+                    data_width: tile_width as u32,
+                    data_height: tile_length as u32,
                 })
             }
         }
@@ -463,7 +466,7 @@ impl Image {
         mut buffer: DecodingBuffer,
         output_width: usize,
         byte_order: ByteOrder,
-        chunk_index: usize,
+        chunk_index: u32,
     ) -> TiffResult<()> {
         // Validate that the provided buffer is of the expected type.
         let color_type = self.colortype()?;
@@ -512,12 +515,12 @@ impl Image {
             _ => {}
         }
 
-        let compressed_bytes = self
-            .chunk_bytes
-            .get(chunk_index)
-            .ok_or(TiffError::FormatError(
-                TiffFormatError::InconsistentSizesEncountered,
-            ))?;
+        let compressed_bytes =
+            self.chunk_bytes
+                .get(chunk_index as usize)
+                .ok_or(TiffError::FormatError(
+                    TiffFormatError::InconsistentSizesEncountered,
+                ))?;
 
         let byte_len = buffer.byte_len();
         let compression_method = self.compression_method;
@@ -533,14 +536,15 @@ impl Image {
         let mut reader =
             Self::create_reader(reader, compression_method, *compressed_bytes, jpeg_tables)?;
 
-        if output_width == chunk_info.data_width && chunk_info.padding_right() == 0 {
-            let total_samples = chunk_info.data_width * chunk_info.data_height * samples;
+        if output_width == chunk_info.data_width as usize && chunk_info.padding_right() == 0 {
+            let total_samples =
+                chunk_info.data_width as usize * chunk_info.data_height as usize * samples;
             let tile = &mut buffer.as_bytes_mut()[..total_samples * byte_len];
             reader.read_exact(tile)?;
 
-            for row in 0..chunk_info.data_height {
-                let row_start = row * output_width * samples;
-                let row_end = (row + 1) * output_width * samples;
+            for row in 0..chunk_info.data_height as usize {
+                let row_start = row as usize * output_width as usize * samples;
+                let row_end = (row + 1) * output_width as usize * samples;
                 let row = buffer.subrange(row_start..row_end);
                 super::fix_endianness_and_predict(row, samples, byte_order, predictor);
             }
@@ -550,10 +554,10 @@ impl Image {
         } else if chunk_info.padding_right() > 0 && self.predictor == Predictor::FloatingPoint {
             // The floating point predictor shuffles the padding bytes into the encoded output, so
             // this case is handled specially when needed.
-            let mut encoded = vec![0u8; chunk_info.chunk_width * samples * byte_len];
-            for row in 0..chunk_info.data_height {
-                let row_start = row * output_width * samples;
-                let row_end = row_start + chunk_info.data_width * samples;
+            let mut encoded = vec![0u8; chunk_info.chunk_width as usize * samples * byte_len];
+            for row in 0..chunk_info.data_height as usize {
+                let row_start = row * output_width as usize * samples;
+                let row_end = row_start + chunk_info.data_width as usize * samples;
 
                 reader.read_exact(&mut encoded)?;
                 match buffer.subrange(row_start..row_end) {
@@ -566,16 +570,17 @@ impl Image {
                 }
             }
         } else {
-            for row in 0..chunk_info.data_height {
-                let row_start = row * output_width * samples;
-                let row_end = row_start + chunk_info.data_width * samples;
+            for row in 0..chunk_info.data_height as usize {
+                let row_start = row * output_width as usize * samples;
+                let row_end = row_start + chunk_info.data_width as usize * samples;
 
                 let row = &mut buffer.as_bytes_mut()[(row_start * byte_len)..(row_end * byte_len)];
                 reader.read_exact(row)?;
 
                 // Skip horizontal padding
                 if chunk_info.padding_right() > 0 {
-                    let len = u64::try_from(chunk_info.padding_right() * samples * byte_len)?;
+                    let len =
+                        u64::try_from(chunk_info.padding_right() as usize * samples * byte_len)?;
                     io::copy(&mut reader.by_ref().take(len), &mut io::sink())?;
                 }
 

src/decoder/mod.rs

@@ -301,7 +301,7 @@ where
     reader: SmartReader<R>,
     bigtiff: bool,
     limits: Limits,
-    current_chunk: usize,
+    current_chunk: u32,
     next_ifd: Option<u64>,
     ifd_offsets: Vec<u64>,
     seen_ifds: HashSet<u64>,
@@ -1064,13 +1064,13 @@ impl<R: Read + Seek> Decoder<R> {
         Ok(())
     }
 
-    fn read_chunk_to_buffer(
+    pub fn read_chunk_to_buffer(
         &mut self,
         mut buffer: DecodingBuffer,
-        tile_index: usize,
+        chunk_index: u32,
         output_width: usize,
     ) -> TiffResult<()> {
-        let offset = self.image.chunk_file_range(tile_index)?.0;
+        let offset = self.image.chunk_file_range(chunk_index)?.0;
         self.goto_offset_u64(offset)?;
 
         let byte_order = self.reader.byte_order;
@@ -1080,7 +1080,7 @@ impl<R: Read + Seek> Decoder<R> {
             buffer.copy(),
             output_width,
             byte_order,
-            tile_index,
+            chunk_index,
         )?;
 
         Ok(())
@@ -1143,9 +1143,9 @@ impl<R: Read + Seek> Decoder<R> {
     /// information on the size of the strip read and so the caller must take care of the final
     /// strip in the image as the data read may be less than the expected strip size. This interface
     /// may change at a future date to reflect this.
-    #[deprecated = "Use read_chunk_at instead"]
+    #[deprecated = "Use read_chunk instead"]
     pub fn read_strip(&mut self) -> TiffResult<DecodingResult> {
-        let result = self.read_chunk_at(self.current_chunk)?;
+        let result = self.read_chunk(self.current_chunk)?;
 
         Ok(result.0)
     }
@@ -1154,9 +1154,9 @@ impl<R: Read + Seek> Decoder<R> {
     /// information on the size of the tile read and so the caller must take care of tiles on the
     /// rightmost column and the bottommost row in the image as the data read may be less than the
     /// expected tile size. This interface may change at a future date to reflect this.
-    #[deprecated = "Use read_chunk_at instead"]
+    #[deprecated = "Use read_chunk instead"]
     pub fn read_tile(&mut self) -> TiffResult<DecodingResult> {
-        let result = self.read_chunk_at(self.current_chunk)?;
+        let result = self.read_chunk(self.current_chunk)?;
 
         self.current_chunk += 1;
 
@@ -1165,15 +1165,22 @@ impl<R: Read + Seek> Decoder<R> {
 
     /// Read the specified chunk (at index `chunk_index`) and return the binary data as a Vector and
     /// `ChunkInfo` describing the size of the chunk.
-    pub fn read_chunk_at(&mut self, chunk_index: usize) -> TiffResult<(DecodingResult, ChunkInfo)> {
+    pub fn read_chunk(&mut self, chunk_index: u32) -> TiffResult<(DecodingResult, ChunkInfo)> {
         let chunk_info = self
             .image()
             .chunk_info(chunk_index)
             .ok_or(UsageError::InvalidChunkIndex(chunk_index))?;
 
-        let mut result = self.result_buffer(chunk_info.data_width, chunk_info.data_height)?;
+        let mut result = self.result_buffer(
+            chunk_info.data_width as usize,
+            chunk_info.data_height as usize,
+        )?;
 
-        self.read_chunk_to_buffer(result.as_buffer(0), chunk_index, chunk_info.data_width)?;
+        self.read_chunk_to_buffer(
+            result.as_buffer(0),
+            chunk_index,
+            chunk_info.data_width as usize,
+        )?;
 
         Ok((result, chunk_info))
     }
@@ -1220,7 +1227,7 @@ impl<R: Read + Seek> Decoder<R> {
                 result.as_buffer(buffer_offset).copy(),
                 width,
                 byte_order,
-                chunk,
+                chunk as u32,
             )?;
         }
 

src/error.rs

@@ -205,7 +205,7 @@ impl fmt::Display for TiffUnsupportedError {
 #[derive(Debug)]
 pub enum UsageError {
     InvalidChunkType(ChunkType, ChunkType),
-    InvalidChunkIndex(usize),
+    InvalidChunkIndex(u32),
 }
 
 impl fmt::Display for UsageError {

tests/decode_images.rs

@@ -275,7 +275,7 @@ fn test_tiled_incremental() {
     assert_eq!(tiles as usize, sums.len());
 
     for tile in 0..tiles {
-        match decoder.read_chunk_at(tile as usize).unwrap() {
+        match decoder.read_chunk(tile).unwrap() {
             (DecodingResult::U8(res), _) => {
                 let sum: u64 = res.into_iter().map(<u64>::from).sum();
                 assert_eq!(sum, sums[tile as usize]);

tests/encode_images.rs

@@ -512,7 +512,7 @@ fn test_rows_per_strip() {
 
         for i in 0..50 {
             let img2 = [i; 2 * 100];
-            match decoder.read_chunk_at(i as usize).unwrap() {
+            match decoder.read_chunk(i as u32).unwrap() {
                 (DecodingResult::U8(data), _) => assert_eq!(&img2[..], &data[..]),
                 other => panic!("Incorrect strip type {:?}", other),
             }