Update high water mark in deflate_stored.
This avoids unnecessary filling of bytes in the sliding window
buffer when switching from level zero to a non-zero level. This
also provides a consistent indication of deflate having taken
input for a later commit ...
diff --git a/deflate.c b/deflate.c
index 0aa020e..8a1a91e 100644
--- a/deflate.c
+++ b/deflate.c
@@ -1756,6 +1756,8 @@
s->block_start = s->strstart;
s->insert += MIN(used, s->w_size - s->insert);
}
+ if (s->high_water < s->strstart)
+ s->high_water = s->strstart;
/* If the last block was written to next_out, then done. */
if (last)
@@ -1783,6 +1785,8 @@
read_buf(s->strm, s->window + s->strstart, have);
s->strstart += have;
}
+ if (s->high_water < s->strstart)
+ s->high_water = s->strstart;
/* There was not enough avail_out to write a complete worthy or flushed
* stored block to next_out. Write a stored block to pending instead, if we
