Drop byteorder dependency

Ref: https://github.com/image-rs/image/issues/1000

Cargo.toml

@@ -17,6 +17,5 @@ repository = "https://github.com/image-rs/image-tiff"
 exclude = ["tests/images/*", "tests/fuzz_images/*"]
 
 [dependencies]
-byteorder = "1.2"
 lzw = "0.10"
 miniz_oxide = "0.3"

src/decoder/stream.rs

@@ -1,10 +1,10 @@
 //! All IO functionality needed for TIFF decoding
 
 use crate::error::{TiffError, TiffResult};
-use byteorder::{BigEndian, LittleEndian, ReadBytesExt};
 use lzw;
 use miniz_oxide::inflate;
 use std::io::{self, Read, Seek};
+use std::slice;
 
 /// Byte order of the TIFF file.
 #[derive(Clone, Copy, Debug)]
@@ -23,82 +23,104 @@ pub trait EndianReader: Read {
     /// Reads an u16
     #[inline(always)]
     fn read_u16(&mut self) -> Result<u16, io::Error> {
-        match self.byte_order() {
+        let mut n = [0u8; 2];
-            ByteOrder::LittleEndian => <Self as ReadBytesExt>::read_u16::<LittleEndian>(self),
+        self.read_exact(&mut n)?;
-            ByteOrder::BigEndian => <Self as ReadBytesExt>::read_u16::<BigEndian>(self),
+        Ok(match self.byte_order() {
-        }
+            ByteOrder::LittleEndian => u16::from_le_bytes(n),
+            ByteOrder::BigEndian => u16::from_be_bytes(n),
+        })
     }
 
     #[inline(always)]
     fn read_u16_into(&mut self, buffer: &mut [u16]) -> Result<(), io::Error> {
+        self.read_exact(unsafe { slice::from_raw_parts_mut(buffer.as_mut_ptr() as *mut u8, buffer.len() * 2) })?;
         match self.byte_order() {
-            ByteOrder::LittleEndian => {
+            ByteOrder::LittleEndian =>
-                <Self as ReadBytesExt>::read_u16_into::<LittleEndian>(self, buffer)
+                for n in buffer {
-            }
+                    *n = u16::from_le(*n);
-            ByteOrder::BigEndian => {
+                },
-                <Self as ReadBytesExt>::read_u16_into::<BigEndian>(self, buffer)
+            ByteOrder::BigEndian =>
-            }
+                for n in buffer {
+                    *n = u16::from_be(*n);
+                },
         }
+        Ok(())
     }
 
     /// Reads an i16
     #[inline(always)]
     fn read_i16(&mut self) -> Result<i16, io::Error> {
-        match self.byte_order() {
+        let mut n = [0u8; 2];
-            ByteOrder::LittleEndian => <Self as ReadBytesExt>::read_i16::<LittleEndian>(self),
+        self.read_exact(&mut n)?;
-            ByteOrder::BigEndian => <Self as ReadBytesExt>::read_i16::<BigEndian>(self),
+        Ok(match self.byte_order() {
-        }
+            ByteOrder::LittleEndian => i16::from_le_bytes(n),
+            ByteOrder::BigEndian => i16::from_be_bytes(n),
+        })
     }
 
     /// Reads an u32
     #[inline(always)]
     fn read_u32(&mut self) -> Result<u32, io::Error> {
-        match self.byte_order() {
+        let mut n = [0u8; 4];
-            ByteOrder::LittleEndian => <Self as ReadBytesExt>::read_u32::<LittleEndian>(self),
+        self.read_exact(&mut n)?;
-            ByteOrder::BigEndian => <Self as ReadBytesExt>::read_u32::<BigEndian>(self),
+        Ok(match self.byte_order() {
-        }
+            ByteOrder::LittleEndian => u32::from_le_bytes(n),
+            ByteOrder::BigEndian => u32::from_be_bytes(n),
+        })
     }
 
     #[inline(always)]
     fn read_u32_into(&mut self, buffer: &mut [u32]) -> Result<(), io::Error> {
+        self.read_exact(unsafe { slice::from_raw_parts_mut(buffer.as_mut_ptr() as *mut u8, buffer.len() * 4) })?;
         match self.byte_order() {
-            ByteOrder::LittleEndian => {
+            ByteOrder::LittleEndian =>
-                <Self as ReadBytesExt>::read_u32_into::<LittleEndian>(self, buffer)
+                for n in buffer {
-            }
+                    *n = u32::from_le(*n);
-            ByteOrder::BigEndian => {
+                },
-                <Self as ReadBytesExt>::read_u32_into::<BigEndian>(self, buffer)
+            ByteOrder::BigEndian =>
-            }
+                for n in buffer {
-        }
+                    *n = u32::from_be(*n);
-    }
+                },
-
-    /// Reads an u64
-    #[inline(always)]
-    fn read_u64(&mut self) -> Result<u64, io::Error> {
-        match self.byte_order() {
-            ByteOrder::LittleEndian => <Self as ReadBytesExt>::read_u64::<LittleEndian>(self),
-            ByteOrder::BigEndian => <Self as ReadBytesExt>::read_u64::<BigEndian>(self),
-        }
-    }
-
-    #[inline(always)]
-    fn read_u64_into(&mut self, buffer: &mut [u64]) -> Result<(), io::Error> {
-        match self.byte_order() {
-            ByteOrder::LittleEndian => {
-                <Self as ReadBytesExt>::read_u64_into::<LittleEndian>(self, buffer)
-            }
-            ByteOrder::BigEndian => {
-                <Self as ReadBytesExt>::read_u64_into::<BigEndian>(self, buffer)
-            }
         }
+        Ok(())
     }
 
     /// Reads an i32
     #[inline(always)]
     fn read_i32(&mut self) -> Result<i32, io::Error> {
+        let mut n = [0u8; 4];
+        self.read_exact(&mut n)?;
+        Ok(match self.byte_order() {
+            ByteOrder::LittleEndian => i32::from_le_bytes(n),
+            ByteOrder::BigEndian => i32::from_be_bytes(n),
+        })
+    }
+
+    /// Reads an u64
+    #[inline(always)]
+    fn read_u64(&mut self) -> Result<u64, io::Error> {
+        let mut n = [0u8; 8];
+        self.read_exact(&mut n)?;
+        Ok(match self.byte_order() {
+            ByteOrder::LittleEndian => u64::from_le_bytes(n),
+            ByteOrder::BigEndian => u64::from_be_bytes(n),
+        })
+    }
+
+    #[inline(always)]
+    fn read_u64_into(&mut self, buffer: &mut [u64]) -> Result<(), io::Error> {
+        self.read_exact(unsafe { slice::from_raw_parts_mut(buffer.as_mut_ptr() as *mut u8, buffer.len() * 8) })?;
         match self.byte_order() {
-            ByteOrder::LittleEndian => <Self as ReadBytesExt>::read_i32::<LittleEndian>(self),
+            ByteOrder::LittleEndian =>
-            ByteOrder::BigEndian => <Self as ReadBytesExt>::read_i32::<BigEndian>(self),
+                for n in buffer {
+                    *n = u64::from_le(*n);
+                },
+            ByteOrder::BigEndian =>
+                for n in buffer {
+                    *n = u64::from_be(*n);
+                },
         }
+        Ok(())
     }
 }
 

src/encoder/mod.rs

@@ -1,4 +1,3 @@
-use byteorder::NativeEndian;
 use std::collections::BTreeMap;
 use std::convert::TryFrom;
 use std::io::{Seek, Write};
@@ -375,7 +374,7 @@ impl<W: Write + Seek> TiffEncoder<W> {
             writer: TiffWriter::new(writer),
         };
 
-        NativeEndian::write_header(&mut encoder.writer)?;
+        write_tiff_header(&mut encoder.writer)?;
         // blank the IFD offset location
         encoder.writer.write_u32(0)?;
 

src/encoder/writer.rs

@@ -1,29 +1,17 @@
 use error::TiffResult;
-use byteorder::{BigEndian, ByteOrder, LittleEndian, NativeEndian, WriteBytesExt};
 use std::io::{self, Seek, SeekFrom, Write};
 
-pub trait TiffByteOrder: ByteOrder {
+pub fn write_tiff_header<W: Write>(writer: &mut TiffWriter<W>) -> TiffResult<()> {
-    fn write_header<W: Write>(writer: &mut TiffWriter<W>) -> TiffResult<()>;
+    #[cfg(target_endian = "little")]
-}
+    let boi: u8 = 0x49;
+    #[cfg(not(target_endian = "little"))]
+    let boi: u8 = 0x4d;
 
-impl TiffByteOrder for LittleEndian {
+    writer.writer.write_all(&[boi, boi])?;
-    fn write_header<W: Write>(writer: &mut TiffWriter<W>) -> TiffResult<()> {
+    writer.writer.write_all(&42u16.to_ne_bytes())?;
-        writer.writer.write_u16::<LittleEndian>(0x4949)?;
+    writer.offset += 4;
-        writer.writer.write_u16::<LittleEndian>(42)?;
-        writer.offset += 4;
 
-        Ok(())
+    Ok(())
-    }
-}
-
-impl TiffByteOrder for BigEndian {
-    fn write_header<W: Write>(writer: &mut TiffWriter<W>) -> TiffResult<()> {
-        writer.writer.write_u16::<BigEndian>(0x4d4d)?;
-        writer.writer.write_u16::<BigEndian>(42)?;
-        writer.offset += 4;
-
-        Ok(())
-    }
 }
 
 pub struct TiffWriter<W> {
@@ -47,47 +35,47 @@ impl<W: Write> TiffWriter<W> {
     }
 
     pub fn write_u8(&mut self, n: u8) -> Result<(), io::Error> {
-        self.writer.write_u8(n)?;
+        self.writer.write_all(&n.to_ne_bytes())?;
         self.offset += 1;
         Ok(())
     }
 
     pub fn write_i8(&mut self, n: i8) -> Result<(), io::Error> {
-        self.writer.write_i8(n)?;
+        self.writer.write_all(&n.to_ne_bytes())?;
         self.offset += 1;
         Ok(())
     }
 
     pub fn write_u16(&mut self, n: u16) -> Result<(), io::Error> {
-        self.writer.write_u16::<NativeEndian>(n)?;
+        self.writer.write_all(&n.to_ne_bytes())?;
         self.offset += 2;
 
         Ok(())
     }
 
     pub fn write_i16(&mut self, n: i16) -> Result<(), io::Error> {
-        self.writer.write_i16::<NativeEndian>(n)?;
+        self.writer.write_all(&n.to_ne_bytes())?;
         self.offset += 2;
 
         Ok(())
     }
 
     pub fn write_u32(&mut self, n: u32) -> Result<(), io::Error> {
-        self.writer.write_u32::<NativeEndian>(n)?;
+        self.writer.write_all(&n.to_ne_bytes())?;
         self.offset += 4;
 
         Ok(())
     }
 
     pub fn write_i32(&mut self, n: i32) -> Result<(), io::Error> {
-        self.writer.write_i32::<NativeEndian>(n)?;
+        self.writer.write_all(&n.to_ne_bytes())?;
         self.offset += 4;
 
         Ok(())
     }
 
     pub fn write_u64(&mut self, n: u64) -> Result<(), io::Error> {
-        self.writer.write_u64::<NativeEndian>(n)?;
+        self.writer.write_all(&n.to_ne_bytes())?;
         self.offset += 8;
 
         Ok(())

src/lib.rs

@@ -6,7 +6,6 @@
 //! # Related Links
 //! * <https://www.adobe.io/open/standards/TIFF.html> - The TIFF specification
 
-extern crate byteorder;
 extern crate lzw;
 extern crate miniz_oxide;