Merge pull request #100 from ruffson/feature_geotiff

Feature GeoTIFF

src/decoder/ifd.rs

@@ -10,14 +10,15 @@ use crate::tags::{Tag, Type};
 use crate::{TiffError, TiffFormatError, TiffResult, TiffUnsupportedError};
 
 use self::Value::{
-    Ascii, Byte, Double, Float, List, Rational, RationalBig, SRational, SRationalBig, Signed,
-    SignedBig, Unsigned, UnsignedBig,
+    Ascii, Byte, Double, Float, List, Rational, RationalBig, SRational, SRationalBig, Short,
+    Signed, SignedBig, Unsigned, UnsignedBig,
 };
 
 #[allow(unused_qualifications)]
 #[derive(Debug, Clone, PartialEq)]
 pub enum Value {
     Byte(u8),
+    Short(u16),
     Signed(i32),
     SignedBig(i64),
     Unsigned(u32),
@@ -42,8 +43,20 @@ impl Value {
         }
     }
 
+    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)?),
             val => Err(TiffError::FormatError(
@@ -64,6 +77,7 @@ impl Value {
 
     pub fn into_u64(self) -> TiffResult<u64> {
         match self {
+            Short(val) => Ok(val.into()),
             Unsigned(val) => Ok(val.into()),
             UnsignedBig(val) => Ok(val),
             val => Err(TiffError::FormatError(
@@ -100,6 +114,15 @@ impl Value {
         }
     }
 
+    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) => {
@@ -139,6 +162,22 @@ impl Value {
         }
     }
 
+    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) => {

src/decoder/mod.rs

@@ -472,6 +472,7 @@ impl<R: Read + Seek> Decoder<R> {
             }
             _ => return Err(TiffUnsupportedError::UnsupportedSampleDepth(self.samples).into()),
         }
+
         Ok(())
     }
 
@@ -728,6 +729,10 @@ impl<R: Read + Seek> Decoder<R> {
     pub fn get_tag_u32_vec(&mut self, tag: Tag) -> TiffResult<Vec<u32>> {
         self.get_tag(tag)?.into_u32_vec()
     }
+
+    pub fn get_tag_u16_vec(&mut self, tag: Tag) -> TiffResult<Vec<u16>> {
+        self.get_tag(tag)?.into_u16_vec()
+    }
     pub fn get_tag_u64_vec(&mut self, tag: Tag) -> TiffResult<Vec<u64>> {
         self.get_tag(tag)?.into_u64_vec()
     }
@@ -747,6 +752,11 @@ impl<R: Read + Seek> Decoder<R> {
         self.get_tag(tag)?.into_u8_vec()
     }
 
+    /// Tries to retrieve a tag and convert it to a ascii vector.
+    pub fn get_tag_ascii_string(&mut self, tag: Tag) -> TiffResult<String> {
+        self.get_tag(tag)?.into_string()
+    }
+
     /// Decompresses the strip into the supplied buffer.
     /// Returns the number of bytes read.
     fn expand_strip<'a>(

src/tags.rs

@@ -120,6 +120,14 @@ pub enum Tag(u16) unknown("A private or extension tag") {
     TileOffsets = 324,
     TileByteCounts = 325,
     SampleFormat = 339,
+    // GeoTIFF
+    ModelPixelScaleTag = 33550, // (SoftDesk)
+    ModelTransformationTag = 34264, // (JPL Carto Group)
+    ModelTiepointTag = 33922, // (Intergraph)
+    GeoKeyDirectoryTag = 34735, // (SPOT)
+    GeoDoubleParamsTag = 34736, // (SPOT)
+    GeoAsciiParamsTag = 34737, // (SPOT)
+    GdalNodata = 42113, // Contains areas with missing data
 }
 }