Fix decompress

Author: rhpvorderman

src/isal/isal_zlib.pyx

@@ -463,7 +463,7 @@ cdef class Decompress:
         try:
             # This loop reads all the input bytes. If there are no input bytes
             # anymore the output is written.
-            while self.stream.block_state != ISAL_BLOCK_FINISH and ibuflen !=0 and not last_round:
+            while True:
                 arrange_input_buffer(&self.stream, &ibuflen)
                 while (self.stream.avail_out == 0 or self.stream.avail_in != 0):
                     self.stream.next_out = obuf  # Reset output buffer.
@@ -488,6 +488,8 @@ cdef class Decompress:
                     out.append(obuf[:bytes_written])
                     if self.stream.block_state == ISAL_BLOCK_FINISH or last_round:
                         break
+                if self.stream.block_state == ISAL_BLOCK_FINISH or ibuflen ==0:
+                    break
             self.save_unconsumed_input(buffer)
             return b"".join(out)
         finally: