Added a couple new Errors that can be supplied during transmutation.

Added an error for a corruption detection of the given bytes. This was
added so that an inproper CRC code when reading a PNG file could
throw an Error.

Added an error for an invalid value being transmuted from the given bytes.
This was added so that an Error can be thrown when a value outside of
a given range is parsed.

src/conversion_error.rs

@@ -7,11 +7,17 @@ use weave::Error;
 #[derive(Copy, Clone, Eq, PartialEq)]
 pub enum ConversionError
 {
+   /// A corruption of the binary data has been detected.
+   CorruptionDetected,
+
+   /// An invalid value was detected.
+   InvalidValue,
+
    /// There were not enough bytes to create the desired type.
    TooFewBytes,
 
    /// There were to many bytes to create the desired type.
-   TooManyBytes
+   TooManyBytes,
 }
 
 
@@ -22,6 +28,16 @@ impl Error for ConversionError
    {
       match *self
       {
+         ConversionError::CorruptionDetected =>
+         {
+            "A corruption of the byte data was detected."
+         }
+
+         ConversionError::InvalidValue =>
+         {
+            "An invalid value was transmuted from the given byte data."
+         }
+
          ConversionError::TooFewBytes =>
          {
             "Not enough bytes of data were provided \
@@ -62,6 +78,16 @@ impl ::std::fmt::Display for ConversionError
    {
       match *self
       {
+         ConversionError::CorruptionDetected =>
+         {
+            write!(f, "Byte Conversion Error:  CorruptionDetected")
+         }
+
+         ConversionError::InvalidValue =>
+         {
+            write!(f, "Byte Conversion Error:  InvalidValue")
+         }
+
          ConversionError::TooFewBytes =>
          {
             write!(f, "Byte Conversion Error:  TooFewBytes")