*/
+#ifdef HAVE_ZLIB
+#include <zlib.h>
+#endif
#include "crc32.h"
const uint8_t *p = data;
uint32_t crc = 0xffffffff;
+#ifdef HAVE_ZLIB
+ /* Prefer zlib's implementation for better performance.
+ * zlib's uInt is always "unsigned int" while size_t can be 64bit.
+ * Since 1.2.9 there's crc32_z that takes size_t, but use the more
+ * available function to avoid build system complications.
+ */
+ if ((uInt)size == size)
+ return ~crc32(0, data, size);
+#endif
+
while (size--)
crc = util_crc32_table[(crc ^ *p++) & 0xff] ^ (crc >> 8);