From e011d8c164402cbb1baf92533dfb4f933ec08fee Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Mon, 1 Jul 2024 19:24:01 -0500
Subject: 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.
---
 trees.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'trees.c')

diff --git a/trees.c b/trees.c
index 979ae41..e052a47 100644
--- a/trees.c
+++ b/trees.c
@@ -184,6 +184,7 @@ local void bi_windup(deflate_state *s) {
     } else if (s->bi_valid > 0) {
         put_byte(s, (Byte)s->bi_buf);
     }
+    s->bi_used = ((s->bi_valid - 1) & 7) + 1;
     s->bi_buf = 0;
     s->bi_valid = 0;
 #ifdef ZLIB_DEBUG
@@ -466,6 +467,7 @@ void ZLIB_INTERNAL _tr_init(deflate_state *s) {
 
     s->bi_buf = 0;
     s->bi_valid = 0;
+    s->bi_used = 0;
 #ifdef ZLIB_DEBUG
     s->compressed_len = 0L;
     s->bits_sent = 0L;
-- 
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