Fixes to PackBitsReader

src/decoder/mod.rs

@@ -1141,10 +1141,7 @@ impl<R: Read + Seek> Decoder<R> {
             CompressionMethod::LZW => {
                 Box::new(LZWReader::new(reader, usize::try_from(compressed_length)?))
             }
-            CompressionMethod::PackBits => Box::new(PackBitsReader::new(
-                reader,
-                usize::try_from(compressed_length)?,
-            )),
+            CompressionMethod::PackBits => Box::new(PackBitsReader::new(reader, compressed_length)),
             CompressionMethod::Deflate | CompressionMethod::OldDeflate => {
                 Box::new(DeflateReader::new(reader))
             }

src/decoder/stream.rs

@@ -270,9 +270,9 @@ pub struct PackBitsReader<R: Read> {
 
 impl<R: Read> PackBitsReader<R> {
     /// Wraps a reader
-    pub fn new(reader: R, length: usize) -> Self {
+    pub fn new(reader: R, length: u64) -> Self {
         Self {
-            reader: reader.take(length as u64),
+            reader: reader.take(length),
             state: PackBitsReaderState::Header,
             count: 0,
         }
@@ -315,7 +315,7 @@ impl<R: Read> Read for PackBitsReader<R> {
         }
 
         self.count -= length;
-        if self.count <= buf.len() {
+        if self.count == 0 {
             self.state = PackBitsReaderState::Header;
         }
         return Ok(length);
@@ -391,7 +391,7 @@ mod test {
         let encoded_len = encoded.len();
 
         let buff = io::Cursor::new(encoded);
-        let mut decoder = PackBitsReader::new(buff, encoded_len);
+        let mut decoder = PackBitsReader::new(buff, encoded_len as u64);
 
         let mut decoded = Vec::new();
         decoder.read_to_end(&mut decoded).unwrap();