1 files changed, 6 insertions, 0 deletions
diff --git a/java/org/brotli/wrapper/enc/EncoderJNI.java b/java/org/brotli/wrapper/enc/EncoderJNI.java
index 6627f5a..5013629 100644
--- a/java/org/brotli/wrapper/enc/EncoderJNI.java
+++ b/java/org/brotli/wrapper/enc/EncoderJNI.java
@@ -27,9 +27,13 @@ class EncoderJNI {
   static class Wrapper {
     protected final long[] context = new long[5];
     private final ByteBuffer inputBuffer;
+    private boolean fresh = true;
 
     Wrapper(int inputBufferSize, int quality, int lgwin)
         throws IOException {
+      if (inputBufferSize <= 0) {
+        throw new IOException("buffer size must be positive");
+      }
       this.context[1] = inputBufferSize;
       this.context[2] = quality;
       this.context[3] = lgwin;
@@ -56,6 +60,7 @@ class EncoderJNI {
         throw new IllegalStateException("pushing input to encoder over previous input");
       }
       context[1] = op.ordinal();
+      fresh = false;
       nativePush(context, length);
     }
 
@@ -86,6 +91,7 @@ class EncoderJNI {
       if (!isSuccess() || !hasMoreOutput()) {
         throw new IllegalStateException("pulling while data is not ready");
       }
+      fresh = false;
       return nativePull(context);
     }