Lazily initialize functable members. (#108)

- Split functableInit() function as separate functions for each functable member, so we don't need to initialize full functable in multiple places in the zlib-ng code, or to check for NULL on every invocation.
- Optimized function for each functable member is detected on first invocation and the functable item is updated for subsequent invocations.
- Remove NULL check in adler32() and adler32_z() as it is no longer needed.

1 files changed, 0 insertions, 4 deletions

diff --git a/adler32.c b/adler32.c
index dcfeecd..f84c73c 100644
--- a/adler32.c
+++ b/adler32.c
@@ -145,15 +145,11 @@ uint32_t adler32_c(uint32_t adler, const unsigned char *buf, size_t len) {
 }
 
 uint32_t ZEXPORT adler32_z(uint32_t adler, const unsigned char *buf, size_t len) {
-    if (functable.adler32 == NULL)
-        functableInit();
     return functable.adler32(adler, buf, len);
 }
 
 /* ========================================================================= */
 uint32_t ZEXPORT adler32(uint32_t adler, const unsigned char *buf, uint32_t len) {
-    if (functable.adler32 == NULL)
-        functableInit();
     return functable.adler32(adler, buf, len);
 }