Add 'neozip/' from commit 'c2712b8a345191f6ed79558c089777df94590087'

git-subtree-dir: neozip
git-subtree-mainline: b1e34e861b5d732afe828d58aad2c638135061fd
git-subtree-split: c2712b8a345191f6ed79558c089777df94590087

1 files changed, 56 insertions, 0 deletions

diff --git a/neozip/crc32_braid_comb.c b/neozip/crc32_braid_comb.c
new file mode 100644
index 0000000000..f253ae10a2
--- /dev/null
+++ b/neozip/crc32_braid_comb.c
@@ -0,0 +1,56 @@
+/* crc32_braid_comb.c -- compute the CRC-32 of a data stream
+ * Copyright (C) 1995-2022 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ * This interleaved implementation of a CRC makes use of pipelined multiple
+ * arithmetic-logic units, commonly found in modern CPU cores. It is due to
+ * Kadatch and Jenkins (2010). See doc/crc-doc.1.0.pdf in this distribution.
+ */
+
+#include "zutil.h"
+#include "crc32_braid_p.h"
+#include "crc32_braid_tbl.h"
+#include "crc32_braid_comb_p.h"
+
+/* ========================================================================= */
+static uint32_t crc32_combine_(uint32_t crc1, uint32_t crc2, z_off64_t len2) {
+    return multmodp(x2nmodp(len2, 3), crc1) ^ crc2;
+}
+static uint32_t crc32_combine_gen_(z_off64_t len2) {
+     return x2nmodp(len2, 3);
+}
+static uint32_t crc32_combine_op_(uint32_t crc1, uint32_t crc2, const uint32_t op) {
+    return multmodp(op, crc1) ^ crc2;
+}
+
+/* ========================================================================= */
+
+#ifdef ZLIB_COMPAT
+unsigned long Z_EXPORT PREFIX(crc32_combine)(unsigned long crc1, unsigned long crc2, z_off_t len2) {
+    return (unsigned long)crc32_combine_((uint32_t)crc1, (uint32_t)crc2, len2);
+}
+unsigned long Z_EXPORT PREFIX4(crc32_combine)(unsigned long crc1, unsigned long crc2, z_off64_t len2) {
+    return (unsigned long)crc32_combine_((uint32_t)crc1, (uint32_t)crc2, len2);
+}
+unsigned long Z_EXPORT PREFIX(crc32_combine_gen)(z_off_t len2) {
+    return crc32_combine_gen_(len2);
+}
+unsigned long Z_EXPORT PREFIX4(crc32_combine_gen)(z_off64_t len2) {
+    return crc32_combine_gen_(len2);
+}
+unsigned long Z_EXPORT PREFIX(crc32_combine_op)(unsigned long crc1, unsigned long crc2, const unsigned long op) {
+    return (unsigned long)crc32_combine_op_((uint32_t)crc1, (uint32_t)crc2, (uint32_t)op);
+}
+#else
+uint32_t Z_EXPORT PREFIX4(crc32_combine)(uint32_t crc1, uint32_t crc2, z_off64_t len2) {
+    return crc32_combine_(crc1, crc2, len2);
+}
+uint32_t Z_EXPORT PREFIX(crc32_combine_gen)(z_off64_t len2) {
+    return crc32_combine_gen_(len2);
+}
+uint32_t Z_EXPORT PREFIX(crc32_combine_op)(uint32_t crc1, uint32_t crc2, const uint32_t op) {
+    return crc32_combine_op_(crc1, crc2, op);
+}
+#endif
+
+/* ========================================================================= */