Add deflateUsed() function to get the used bits in the last byte.

This returns the number of used bits in the last byte of a stream
that has just been compressed with deflate.

1 files changed, 3 insertions, 0 deletions

diff --git a/deflate.h b/deflate.h
index 300c6ad..4884a4b 100644
--- a/deflate.h
+++ b/deflate.h
@@ -271,6 +271,9 @@ typedef struct internal_state {
     /* Number of valid bits in bi_buf.  All bits above the last valid bit
      * are always zero.
      */
+    int bi_used;
+    /* Last number of used bits when going to a byte boundary.
+     */
 
     ulg high_water;
     /* High water mark offset in window for initialized bytes -- bytes above