1 files changed, 50 insertions, 0 deletions
diff --git a/neozip/functable.h b/neozip/functable.h
new file mode 100644
index 0000000000..95e05d5ed7
--- /dev/null
+++ b/neozip/functable.h
@@ -0,0 +1,50 @@
+/* functable.h -- Struct containing function pointers to optimized functions
+ * Copyright (C) 2017 Hans Kristian Rosbach
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifndef FUNCTABLE_H_
+#define FUNCTABLE_H_
+
+#include "deflate.h"
+
+#ifdef DISABLE_RUNTIME_CPU_DETECTION
+
+#  include "arch_functions.h"
+
+/* When compiling with native instructions it is not necessary to use functable.
+ * Instead we use native_ macro indicating the best available variant of arch-specific
+ * functions for the current platform.
+ */
+#  define FUNCTABLE_INIT ((void)0)
+#  define FUNCTABLE_CALL(name) native_ ## name
+#  define FUNCTABLE_FPTR(name) &native_ ## name
+
+#else
+
+struct functable_s {
+    int      (* force_init)         (void);
+    uint32_t (* adler32)            (uint32_t adler, const uint8_t *buf, size_t len);
+    uint32_t (* adler32_copy)       (uint32_t adler, uint8_t *dst, const uint8_t *src, size_t len);
+    uint8_t* (* chunkmemset_safe)   (uint8_t *out, uint8_t *from, size_t len, size_t left);
+    uint32_t (* compare256)         (const uint8_t *src0, const uint8_t *src1);
+    uint32_t (* crc32)              (uint32_t crc, const uint8_t *buf, size_t len);
+    uint32_t (* crc32_copy)         (uint32_t crc, uint8_t *dst, const uint8_t *src, size_t len);
+    void     (* inflate_fast)       (PREFIX3(stream) *strm, uint32_t start);
+    uint32_t (* longest_match)      (deflate_state *const s, uint32_t cur_match);
+    uint32_t (* longest_match_slow) (deflate_state *const s, uint32_t cur_match);
+    void     (* slide_hash)         (deflate_state *s);
+};
+
+Z_INTERNAL extern struct functable_s functable;
+
+
+/* Explicitly indicate functions are conditionally dispatched.
+ */
+#  define FUNCTABLE_INIT if (functable.force_init()) {return Z_VERSION_ERROR;}
+#  define FUNCTABLE_CALL(name) functable.name
+#  define FUNCTABLE_FPTR(name) functable.name
+
+#endif
+
+#endif