Only calculate inflate chunk size once and store it for future use for performance.

1 files changed, 3 insertions, 2 deletions

diff --git a/inflate.c b/inflate.c
index 69fc0e1..340f854 100644
--- a/inflate.c
+++ b/inflate.c
@@ -155,6 +155,7 @@ int32_t ZEXPORT PREFIX(inflateInit2_)(PREFIX3(stream) *strm, int32_t windowBits,
     state->strm = strm;
     state->window = NULL;
     state->mode = HEAD;     /* to pass state test in inflateReset2() */
+    state->chunksize = functable.chunksize();
     ret = PREFIX(inflateReset2)(strm, windowBits);
     if (ret != Z_OK) {
         ZFREE_STATE(strm, state);
@@ -203,10 +204,10 @@ int ZLIB_INTERNAL inflate_ensure_window(struct inflate_state *state) {
     /* if it hasn't been done already, allocate space for the window */
     if (state->window == NULL) {
         unsigned wsize = 1U << state->wbits;
-        state->window = (unsigned char *) ZALLOC_WINDOW(state->strm, wsize + functable.chunksize(), sizeof(unsigned char));
+        state->window = (unsigned char *) ZALLOC_WINDOW(state->strm, wsize + state->chunksize, sizeof(unsigned char));
         if (state->window == Z_NULL)
             return 1;
-        memset(state->window + wsize, 0, functable.chunksize());
+        memset(state->window + wsize, 0, state->chunksize);
     }
 
     /* if window not in use yet, initialize */