1 files changed, 188 insertions, 0 deletions
diff --git a/vendor/tiff/src/encoder/writer.rs b/vendor/tiff/src/encoder/writer.rs
new file mode 100644
index 0000000..c5139e9
--- /dev/null
+++ b/vendor/tiff/src/encoder/writer.rs
@@ -0,0 +1,188 @@
+use crate::encoder::compression::*;
+use crate::error::TiffResult;
+use std::io::{self, Seek, SeekFrom, Write};
+
+pub fn write_tiff_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;
+
+    writer.writer.write_all(&[boi, boi])?;
+    writer.writer.write_all(&42u16.to_ne_bytes())?;
+    writer.offset += 4;
+
+    Ok(())
+}
+
+/// Writes a BigTiff header, excluding the IFD offset field.
+///
+/// Writes the byte order, version number, offset byte size, and zero constant fields. Does
+// _not_ write the offset to the first IFD, this should be done by the caller.
+pub fn write_bigtiff_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;
+
+    // byte order indication
+    writer.writer.write_all(&[boi, boi])?;
+    // version number
+    writer.writer.write_all(&43u16.to_ne_bytes())?;
+    // bytesize of offsets (pointer size)
+    writer.writer.write_all(&8u16.to_ne_bytes())?;
+    // always 0
+    writer.writer.write_all(&0u16.to_ne_bytes())?;
+
+    // we wrote 8 bytes, so set the internal offset accordingly
+    writer.offset += 8;
+
+    Ok(())
+}
+
+pub struct TiffWriter<W> {
+    writer: W,
+    offset: u64,
+    byte_count: u64,
+    compressor: Compressor,
+}
+
+impl<W: Write> TiffWriter<W> {
+    pub fn new(writer: W) -> Self {
+        Self {
+            writer,
+            offset: 0,
+            byte_count: 0,
+            compressor: Compressor::default(),
+        }
+    }
+
+    pub fn set_compression(&mut self, compressor: Compressor) {
+        self.compressor = compressor;
+    }
+
+    pub fn reset_compression(&mut self) {
+        self.compressor = Compressor::default();
+    }
+
+    pub fn offset(&self) -> u64 {
+        self.offset
+    }
+
+    pub fn last_written(&self) -> u64 {
+        self.byte_count
+    }
+
+    pub fn write_bytes(&mut self, bytes: &[u8]) -> Result<(), io::Error> {
+        self.byte_count = self.compressor.write_to(&mut self.writer, bytes)?;
+        self.offset += self.byte_count;
+        Ok(())
+    }
+
+    pub fn write_u8(&mut self, n: u8) -> Result<(), io::Error> {
+        self.byte_count = self
+            .compressor
+            .write_to(&mut self.writer, &n.to_ne_bytes())?;
+        self.offset += self.byte_count;
+        Ok(())
+    }
+
+    pub fn write_i8(&mut self, n: i8) -> Result<(), io::Error> {
+        self.byte_count = self
+            .compressor
+            .write_to(&mut self.writer, &n.to_ne_bytes())?;
+        self.offset += self.byte_count;
+        Ok(())
+    }
+
+    pub fn write_u16(&mut self, n: u16) -> Result<(), io::Error> {
+        self.byte_count = self
+            .compressor
+            .write_to(&mut self.writer, &n.to_ne_bytes())?;
+        self.offset += self.byte_count;
+
+        Ok(())
+    }
+
+    pub fn write_i16(&mut self, n: i16) -> Result<(), io::Error> {
+        self.byte_count = self
+            .compressor
+            .write_to(&mut self.writer, &n.to_ne_bytes())?;
+        self.offset += self.byte_count;
+
+        Ok(())
+    }
+
+    pub fn write_u32(&mut self, n: u32) -> Result<(), io::Error> {
+        self.byte_count = self
+            .compressor
+            .write_to(&mut self.writer, &n.to_ne_bytes())?;
+        self.offset += self.byte_count;
+
+        Ok(())
+    }
+
+    pub fn write_i32(&mut self, n: i32) -> Result<(), io::Error> {
+        self.byte_count = self
+            .compressor
+            .write_to(&mut self.writer, &n.to_ne_bytes())?;
+        self.offset += self.byte_count;
+
+        Ok(())
+    }
+
+    pub fn write_u64(&mut self, n: u64) -> Result<(), io::Error> {
+        self.byte_count = self
+            .compressor
+            .write_to(&mut self.writer, &n.to_ne_bytes())?;
+        self.offset += self.byte_count;
+
+        Ok(())
+    }
+
+    pub fn write_i64(&mut self, n: i64) -> Result<(), io::Error> {
+        self.byte_count = self
+            .compressor
+            .write_to(&mut self.writer, &n.to_ne_bytes())?;
+        self.offset += self.byte_count;
+
+        Ok(())
+    }
+
+    pub fn write_f32(&mut self, n: f32) -> Result<(), io::Error> {
+        self.byte_count = self
+            .compressor
+            .write_to(&mut self.writer, &u32::to_ne_bytes(n.to_bits()))?;
+        self.offset += self.byte_count;
+
+        Ok(())
+    }
+
+    pub fn write_f64(&mut self, n: f64) -> Result<(), io::Error> {
+        self.byte_count = self
+            .compressor
+            .write_to(&mut self.writer, &u64::to_ne_bytes(n.to_bits()))?;
+        self.offset += self.byte_count;
+
+        Ok(())
+    }
+
+    pub fn pad_word_boundary(&mut self) -> Result<(), io::Error> {
+        if self.offset % 4 != 0 {
+            let padding = [0, 0, 0];
+            let padd_len = 4 - (self.offset % 4);
+            self.writer.write_all(&padding[..padd_len as usize])?;
+            self.offset += padd_len;
+        }
+
+        Ok(())
+    }
+}
+
+impl<W: Seek> TiffWriter<W> {
+    pub fn goto_offset(&mut self, offset: u64) -> Result<(), io::Error> {
+        self.offset = offset;
+        self.writer.seek(SeekFrom::Start(offset as u64))?;
+        Ok(())
+    }
+}