ensure dependency for zlib wrapper

zlibWrapper/gzwrite.c

@@ -6,6 +6,8 @@
  * For conditions of distribution and use, see http://www.zlib.net/zlib_license.html
  */
 
+#include <assert.h>
+
 #include "gzguts.h"
 
 /* Local functions */
@@ -24,7 +26,7 @@ local int gz_init(state)
     z_streamp strm = &(state.state->strm);
 
     /* allocate input buffer (double size for gzprintf) */
-    state.state->in = (unsigned char *)malloc(state.state->want << 1);
+    state.state->in = (unsigned char*)malloc(state.state->want << 1);
     if (state.state->in == NULL) {
         gz_error(state, Z_MEM_ERROR, "out of memory");
         return -1;
@@ -33,7 +35,7 @@ local int gz_init(state)
     /* only need output buffer and deflate state if compressing */
     if (!state.state->direct) {
         /* allocate output buffer */
-        state.state->out = (unsigned char *)malloc(state.state->want);
+        state.state->out = (unsigned char*)malloc(state.state->want);
         if (state.state->out == NULL) {
             free(state.state->in);
             gz_error(state, Z_MEM_ERROR, "out of memory");
@@ -284,6 +286,7 @@ z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
     gz_statep state;
 
     /* get internal structure */
+    assert(size != 0);
     if (file == NULL)
         return 0;
     state = (gz_statep)file;
@@ -294,7 +297,7 @@ z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
 
     /* compute bytes to read -- error on overflow */
     len = nitems * size;
-    if (size && len / size != nitems) {
+    if (size && (len / size != nitems)) {
         gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
         return 0;
     }